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The design of an additively manufactured circular waveguide 3dB hybrid directional coupler is proposed and demonstrated. Asymmetric corner radius perturbations at the in-plane orthogonal junction of the four waveguides along with curvilinear inductive posts designed to interact with the TE11 mode of the circular waveguide are used to facilitate directivity and isolation. Capacitive waveguide perturbations at each of the four ports provide impedance matching. The proposed design is engineered to operate within V-band from 57 to 64 GHz and provide both 10 dB isolation and return loss and a 90° phase difference between the direct and coupled ports. A commercially available stereolithography (SLA) printer is used to fabricate the hybrid coupler as well as the rectangular-to-circular tapered mode transducers and the TRL calibration components required for experiments. The printed couplers are metallized using an electroless silver plating process by a closed-loop bidirectional multi-port pump-driven fluidic system. Results from experiment and simulation are provided.
W. Liu; Z. Chen; T. Viola; G. H. Huff. 3-D Printed Directional Couplers in Circular Waveguide. IEEE Microwave and Wireless Components Letters 2021, 31, 561 -564.
AMA StyleW. Liu, Z. Chen, T. Viola, G. H. Huff. 3-D Printed Directional Couplers in Circular Waveguide. IEEE Microwave and Wireless Components Letters. 2021; 31 (6):561-564.
Chicago/Turabian StyleW. Liu; Z. Chen; T. Viola; G. H. Huff. 2021. "3-D Printed Directional Couplers in Circular Waveguide." IEEE Microwave and Wireless Components Letters 31, no. 6: 561-564.
This work presents the design and fabrication of two multi-element structurally embedded vascular antennas (SEVAs). These are achieved through advances in additively manufactured sacrificial materials and demonstrate the ability to embed vascular microchannels in both planar and complex-curved epoxy-filled quartz fiber structural composite panels. Frequency-reconfigurable antennas are formed by these structures through the pressure-driven transport of liquid metal through the embedded microchannels. The planar multi-layer topology examines the ability to fabricate two co-located radiating structures separated by a single ply of quartz fabric within the composite layup. The multi-element linear array topology composed of microchannels embedded on to a single-layer are used to demonstrate the ability to conformally-integrate these channels into a complex curved surface that mimics an array of antennas on the leading edge of an Unmanned Aerial Vehicle (UAV). A parallel-strip antipodal dipole feed structure provides excitation and serves as the interface for fluid displacement within the microchannels to facilitate reconfiguration. The nominal design of the SEVAs achieve over a decade of frequency reconfiguration with respect to the fundamental dipole mode of the antenna. Experimental and predicted results demonstrate the operation for canonical states of the antennas. Additional results for the array topology demonstrate beam steering and contiguous operation of interconnected elements in the multi-element structure.
Amrita Bal; Jeffery Baur; Darren Hartl; Geoffrey Frank; Thao Gibson; Hong Pan; Gregory Huff. Multi-Layer and Conformally Integrated Structurally Embedded Vascular Antenna (SEVA) Arrays. Sensors 2021, 21, 1764 .
AMA StyleAmrita Bal, Jeffery Baur, Darren Hartl, Geoffrey Frank, Thao Gibson, Hong Pan, Gregory Huff. Multi-Layer and Conformally Integrated Structurally Embedded Vascular Antenna (SEVA) Arrays. Sensors. 2021; 21 (5):1764.
Chicago/Turabian StyleAmrita Bal; Jeffery Baur; Darren Hartl; Geoffrey Frank; Thao Gibson; Hong Pan; Gregory Huff. 2021. "Multi-Layer and Conformally Integrated Structurally Embedded Vascular Antenna (SEVA) Arrays." Sensors 21, no. 5: 1764.
This work discusses the design of a microstrip patch antenna and its use as an orientation-agnostic radiator in an origami-inspired folding antenna array. The antenna is based on a perturbed circular patch design that is impedance matched to reside in a radial feed network for a 2 × 2 array. This 2 × 2 array can be switched to provide sum and difference pattern behaviour. Both the feed network and the ground plane are modified to enable folding of the structure according to the Miura-ori pattern. The performance of a circularly polarised array is evaluated for a comprehensive range of fold angles to evaluate the impact of physical reconfiguration. Results for a simulated and fabricated circularly polarised array are provided for a 3 GHz design.
Francisco A. Espinal; Gregory H. Huff; Sumana Pallampati; Deanna Sessions; Kazuko Fuchi; Giorgio Bazzan; Steven R. Seiler; Philip R. Buskohl; Alexander B. Cook; Andrew S. Gillman. Circularly‐polarised origami‐inspired folding patch antenna sub‐array. IET Microwaves, Antennas & Propagation 2020, 14, 1262 -1271.
AMA StyleFrancisco A. Espinal, Gregory H. Huff, Sumana Pallampati, Deanna Sessions, Kazuko Fuchi, Giorgio Bazzan, Steven R. Seiler, Philip R. Buskohl, Alexander B. Cook, Andrew S. Gillman. Circularly‐polarised origami‐inspired folding patch antenna sub‐array. IET Microwaves, Antennas & Propagation. 2020; 14 (11):1262-1271.
Chicago/Turabian StyleFrancisco A. Espinal; Gregory H. Huff; Sumana Pallampati; Deanna Sessions; Kazuko Fuchi; Giorgio Bazzan; Steven R. Seiler; Philip R. Buskohl; Alexander B. Cook; Andrew S. Gillman. 2020. "Circularly‐polarised origami‐inspired folding patch antenna sub‐array." IET Microwaves, Antennas & Propagation 14, no. 11: 1262-1271.
In this work a novel technique using closed form expressions is rigorously surveyed to collaboratively nullsteer uniformly distributed, planar ring and volumetric shell distributions. To assess the radiation behavior of these geometries circular tapers are of interest for their attractiveness in derivation, design, application and mathematical simplicity. A rigorous mathematical derivation is used for the generation of closed form expressions of mean valued radiation characteristics. Numerical simulations are performed using both ANSYS HFSS and MATLAB using a finite element distribution. To validate the analytical models, we include measured results of a uniformly distributed ring array topology, constrained to a set of 18 elements. Results of all methods are compared to demonstrate exceptional agreement in the recommended theoretical analysis. This process follows differently from traditional phased array nulling methods, which apply unique amplitude tapers along individual phased array elements. Unlike typical adaptive beamforming algorithms this process does not require the estimation of second order statistical metrics, and avoids expansions of large polynomial equations. It uses shared aperture characteristics in order to generate null beams simultaneously. This can also be extended to widen null widths from the compounding of these shared apertures distributions, which is shown in simulation.
Kristopher Buchanan; Jeffrey Jensen; Carlos Flores-Molina; Sara Wheeland; Gregory H. Huff. Null Beamsteering Using Distributed Arrays and Shared Aperture Distributions. IEEE Transactions on Antennas and Propagation 2020, 68, 5353 -5364.
AMA StyleKristopher Buchanan, Jeffrey Jensen, Carlos Flores-Molina, Sara Wheeland, Gregory H. Huff. Null Beamsteering Using Distributed Arrays and Shared Aperture Distributions. IEEE Transactions on Antennas and Propagation. 2020; 68 (7):5353-5364.
Chicago/Turabian StyleKristopher Buchanan; Jeffrey Jensen; Carlos Flores-Molina; Sara Wheeland; Gregory H. Huff. 2020. "Null Beamsteering Using Distributed Arrays and Shared Aperture Distributions." IEEE Transactions on Antennas and Propagation 68, no. 7: 5353-5364.
Filtering of electromagnetic signals is key for improved signal to noise ratios for a broad class of devices. However, maintaining filter performance in systems undergoing large changes in shape can be challenging, due to the interdependency between element geometry, orientation and lattice spacing. To address this challenge, an origami-based, reconfigurable spatial X-band filter with consistent frequency filtering is presented. Direct-write additive manufacturing is used to print metallic Archimedean spiral elements in a lattice on the substrate. Elements in the lattice couple to one another and this results in a frequency selective surface acting as a stop-band filter at a target frequency. The lattice is designed to maintain the filtered frequency through multiple fold angles. The combined design, modeling, fabrication, and experimental characterization results of this study provide a set of guidelines for future design of physically reconfigurable filters exhibiting sustained performance.
Deanna Sessions; Alexander Cook; Kazuko Fuchi; Andrew Gillman; Gregory Huff; Philip Buskohl. Origami-Inspired Frequency Selective Surface with Fixed Frequency Response under Folding. Sensors 2019, 19, 4808 .
AMA StyleDeanna Sessions, Alexander Cook, Kazuko Fuchi, Andrew Gillman, Gregory Huff, Philip Buskohl. Origami-Inspired Frequency Selective Surface with Fixed Frequency Response under Folding. Sensors. 2019; 19 (21):4808.
Chicago/Turabian StyleDeanna Sessions; Alexander Cook; Kazuko Fuchi; Andrew Gillman; Gregory Huff; Philip Buskohl. 2019. "Origami-Inspired Frequency Selective Surface with Fixed Frequency Response under Folding." Sensors 19, no. 21: 4808.
Three-dimensional printing and metal plating of trough waveguide structure operating in the ISM band ranging from 57-64 GHz is discussed. Addition of commercially available filter in the currently available circulatory electroless silver plating system is discussed and the improvement in insertion coefficient measurement is highlighted. Potential application of short length trough waveguide as TRU calibration standard for measuring longer length trough waveguide section is also discussed.
Amrita Bal; Anoop Tiwari; Gregory Huff. Electroless Silver Plating of Additive Manufactured Trough Waveguide Mode Transducer and Antenna Structure. 2019 IEEE International Symposium on Antennas and Propagation and USNC-URSI Radio Science Meeting 2019, 93 -94.
AMA StyleAmrita Bal, Anoop Tiwari, Gregory Huff. Electroless Silver Plating of Additive Manufactured Trough Waveguide Mode Transducer and Antenna Structure. 2019 IEEE International Symposium on Antennas and Propagation and USNC-URSI Radio Science Meeting. 2019; ():93-94.
Chicago/Turabian StyleAmrita Bal; Anoop Tiwari; Gregory Huff. 2019. "Electroless Silver Plating of Additive Manufactured Trough Waveguide Mode Transducer and Antenna Structure." 2019 IEEE International Symposium on Antennas and Propagation and USNC-URSI Radio Science Meeting , no. : 93-94.
This paper reports on the research of factors that impact the accuracy and efficiency of an unmanned aerial vehicle (UAV) based radio frequency (RF) and microwave data collection system. The swarming UAVs (agents) can be utilized to create micro-UAV swarm-based (MUSB) aperiodic antenna arrays that reduce angle ambiguity and improve convergence in sub-space direction-of-arrival (DOA) techniques. A mathematical data model is addressed in this paper to demonstrate fundamental properties of MUSB antenna arrays and study the performance of the data collection system framework. The Cramer–Rao bound (CRB) associated with two-dimensional (2D) DOAs of sources in the presence of sensor gain and phase coefficient is derived. The single-source case is studied in detail. The vector-space of emitters is exploited and the iterative-MUSIC (multiple signal classification) algorithm is created to estimate 2D DOAs of emitters. Numerical examples and practical measurements are provided to demonstrate the feasibility of the proposed MUSB data collection system framework using iterative-MUSIC algorithm and benchmark theoretical expectations.
Zhong Chen; Shihyuan Yeh; Jean-Francois Chamberland; Gregory H. Huff. A Sensor-Driven Analysis of Distributed Direction Finding Systems Based on UAV Swarms. Sensors 2019, 19, 2659 .
AMA StyleZhong Chen, Shihyuan Yeh, Jean-Francois Chamberland, Gregory H. Huff. A Sensor-Driven Analysis of Distributed Direction Finding Systems Based on UAV Swarms. Sensors. 2019; 19 (12):2659.
Chicago/Turabian StyleZhong Chen; Shihyuan Yeh; Jean-Francois Chamberland; Gregory H. Huff. 2019. "A Sensor-Driven Analysis of Distributed Direction Finding Systems Based on UAV Swarms." Sensors 19, no. 12: 2659.
V-band waveguide components operating in 57–64 GHz ISM band is presented. Consumer-grade stereolithographic 3D printer is used to print these waveguide components with black-pigmented acrylate-based polymer. Electroless deposition of silver on these microwave components is achieved using an in-house system assembled with off-the-shelf components. This system is driven by a peristaltic pump, circling plating solution between silver bath and waveguide. Metal plated WR-15, 2-inch waveguide section offers average insertion coefficient of −0.35 dB. Trough waveguide section connected to rectangular waveguide through rectangular to trough waveguide transition is metal plated and offers average insertion coefficient of −1 dB. Silver deposited using the pump operated system offers potential of achieving comparable results as conventional dip coating technique.
A. Bal; D.G. Carey; F.A. Espinal; G.H. Huff. Electroless silver plating of 3D printed waveguide components by peristaltic pump driven system. Electronics Letters 2019, 55, 100 -102.
AMA StyleA. Bal, D.G. Carey, F.A. Espinal, G.H. Huff. Electroless silver plating of 3D printed waveguide components by peristaltic pump driven system. Electronics Letters. 2019; 55 (2):100-102.
Chicago/Turabian StyleA. Bal; D.G. Carey; F.A. Espinal; G.H. Huff. 2019. "Electroless silver plating of 3D printed waveguide components by peristaltic pump driven system." Electronics Letters 55, no. 2: 100-102.
The effects of tessellation facet size and focal length to diameter ratio on the radiation pattern of an origami-inspired parabolic reflector antenna are presented. Tessellations are determined from the discretization of a parabolic dish into an approximate faceted structure. Varying levels of discretization are analyzed for their impact on antenna behavior. Structural and electromagnetic modeling and simulation tools are presented for their applications in origami-based designs. A structural prototype is presented to demonstrate manufacturing and folding abilities.
Deanna Sessions; Joshua T. Ruff; Francisco A. Espinal; Gregory Huff; Sameer Jape; Edwin Peraza Hernandez; Dimitris C. Lagoudas; Darren Hartl; Beatriz Borges. Folding, Tessellation, and Deployment of an Origami-Inspired Active-Material-Enabled Self-Folding Reflector Antenna. 2018 IEEE International Symposium on Antennas and Propagation & USNC/URSI National Radio Science Meeting 2018, 929 -930.
AMA StyleDeanna Sessions, Joshua T. Ruff, Francisco A. Espinal, Gregory Huff, Sameer Jape, Edwin Peraza Hernandez, Dimitris C. Lagoudas, Darren Hartl, Beatriz Borges. Folding, Tessellation, and Deployment of an Origami-Inspired Active-Material-Enabled Self-Folding Reflector Antenna. 2018 IEEE International Symposium on Antennas and Propagation & USNC/URSI National Radio Science Meeting. 2018; ():929-930.
Chicago/Turabian StyleDeanna Sessions; Joshua T. Ruff; Francisco A. Espinal; Gregory Huff; Sameer Jape; Edwin Peraza Hernandez; Dimitris C. Lagoudas; Darren Hartl; Beatriz Borges. 2018. "Folding, Tessellation, and Deployment of an Origami-Inspired Active-Material-Enabled Self-Folding Reflector Antenna." 2018 IEEE International Symposium on Antennas and Propagation & USNC/URSI National Radio Science Meeting , no. : 929-930.
This work investigates and develops the physical reconfiguration and deployment of a previously designed 2×2 corporate-fed microstrip patch antenna array. The physical reconfiguration of the antenna is achieved using a Miura-ori fold pattern due to its utilization for deployment. Increasing the fold angle impacts the input impedance and beamforming capabilities by changing the element spacing and orientation. The previous design experienced a graceful degradation in electromagnetic performance as the fold angle increased. Further optimization led to a more robust and functional antenna array system. The antenna is enhanced by designing the array with circularly polarized patch elements. The use of circular polarization eliminates the need to study the polarization changes during intermediate folding states and enables pattern reconfigurability. The performance of the circularly polarized array is evaluated over a comprehensive range of angles to evaluate the impact of physical reconfiguration. Results from a simulated circularly polarized array are provided for a 3GHz design.
Steven R. Seiler; Giorgio Bazzan; Kazudo Fuchi; Edward J. Alanyak; Andrew S. Gilman; Gregory W. Reich; Alexander Cook; Philip R. Buskohl; Sumana Pallampati; Francisco A. Espinal; Deanna Sessions; Gregory Huff. An Origami Inspired Circularly-Polarized Folding Patch Antenna Array. 2018 IEEE International Symposium on Antennas and Propagation & USNC/URSI National Radio Science Meeting 2018, 181 -182.
AMA StyleSteven R. Seiler, Giorgio Bazzan, Kazudo Fuchi, Edward J. Alanyak, Andrew S. Gilman, Gregory W. Reich, Alexander Cook, Philip R. Buskohl, Sumana Pallampati, Francisco A. Espinal, Deanna Sessions, Gregory Huff. An Origami Inspired Circularly-Polarized Folding Patch Antenna Array. 2018 IEEE International Symposium on Antennas and Propagation & USNC/URSI National Radio Science Meeting. 2018; ():181-182.
Chicago/Turabian StyleSteven R. Seiler; Giorgio Bazzan; Kazudo Fuchi; Edward J. Alanyak; Andrew S. Gilman; Gregory W. Reich; Alexander Cook; Philip R. Buskohl; Sumana Pallampati; Francisco A. Espinal; Deanna Sessions; Gregory Huff. 2018. "An Origami Inspired Circularly-Polarized Folding Patch Antenna Array." 2018 IEEE International Symposium on Antennas and Propagation & USNC/URSI National Radio Science Meeting , no. : 181-182.
The modularization of 28 GHz multi-mode circular arrays and 60 GHz phased sub-arrays onto N-sided convex polygons is presented. This includes a study on the basic impact of phase error arising from this mapping and the achievable radiation performance from both bands. The intent of this mapping is to investigate the manufacturability and modularization of dual-band mm-wave phased arrays operating at 28 GHz and 60 GHz. The faceted 28 GHz design is operated as a non-uniform multi-mode array, where the polygon is used to approximate the ideal uniform circular array. This gives rise to a subarray concept for a multi-band (or wide band) antenna that operates as a traditional phased array panel in this architecture. In this work, we constrain the resulting design space to provide an approximation of uniform spacing based on the geometric parameterization of the structure for half-wave spacing in the 28 GHz band. The basic layout of the design is presented first and constrained to examine the error arising from modularization. A wavelength-scaled prototype operating at 2.4 GHz is used to demonstrate the measurement and error of the system.
Gregory H. Huff; Karl White; David Grayson; Fransisco Espinal; W. Mark Dorsey; Anna Stumme. Polygonalization of mm-wave dual-band circular phased arrays for multi-mode beamforming. 2018 IEEE 19th Wireless and Microwave Technology Conference (WAMICON) 2018, 1 -4.
AMA StyleGregory H. Huff, Karl White, David Grayson, Fransisco Espinal, W. Mark Dorsey, Anna Stumme. Polygonalization of mm-wave dual-band circular phased arrays for multi-mode beamforming. 2018 IEEE 19th Wireless and Microwave Technology Conference (WAMICON). 2018; ():1-4.
Chicago/Turabian StyleGregory H. Huff; Karl White; David Grayson; Fransisco Espinal; W. Mark Dorsey; Anna Stumme. 2018. "Polygonalization of mm-wave dual-band circular phased arrays for multi-mode beamforming." 2018 IEEE 19th Wireless and Microwave Technology Conference (WAMICON) , no. : 1-4.
Deanna Sessions; Kazuko Fuchi; Sumana Pallampati; David Grayson; Steven Seiler; Giorgio Bazzan; Gregory Reich; Philip Buskohl; Gregory H. Huff. INVESTIGATION OF FOLD-DEPENDENT BEHAVIOR IN AN ORIGAMI-INSPIRED FSS UNDER NORMAL INCIDENCE. Progress In Electromagnetics Research M 2018, 63, 131 -139.
AMA StyleDeanna Sessions, Kazuko Fuchi, Sumana Pallampati, David Grayson, Steven Seiler, Giorgio Bazzan, Gregory Reich, Philip Buskohl, Gregory H. Huff. INVESTIGATION OF FOLD-DEPENDENT BEHAVIOR IN AN ORIGAMI-INSPIRED FSS UNDER NORMAL INCIDENCE. Progress In Electromagnetics Research M. 2018; 63 ():131-139.
Chicago/Turabian StyleDeanna Sessions; Kazuko Fuchi; Sumana Pallampati; David Grayson; Steven Seiler; Giorgio Bazzan; Gregory Reich; Philip Buskohl; Gregory H. Huff. 2018. "INVESTIGATION OF FOLD-DEPENDENT BEHAVIOR IN AN ORIGAMI-INSPIRED FSS UNDER NORMAL INCIDENCE." Progress In Electromagnetics Research M 63, no. : 131-139.
Low-cost unmanned aircraft that use affordable manufacturing and have limited service life can enable mission concepts in which there is a higher tolerance for aircraft loss, or attrition. Because of their higher risk tolerance, these low-cost attritable aircraft could also integrate emerging technology which may have previously been considered too risky for integration into expensive and long life aircraft. Light-weight multifunctional structural composites have the potential to integrate additional functions and enable mission agility without significantly adding weight or reducing payload capacity. However, design and development of these material systems are often difficult because of the traditional “building block” development approach used for traditional composites, the large option space available for structural and functional properties, and the potential complexity of the multiscale and multiphysics coupling. To realize integrated functionality, new multi-scales and multi-physical experimental mechanical characterization techniques should be merged with maturing integrated materials models. We discuss this need using examples of a reconfigurable liquid metal Structurally Embedded Vascular Antenna (SEVA), a plasmonic nanoparticle based method for measuring internal temperature gradients, and embedded micro-cantilever carbon-nanotube based sensors. The latter of these is also used to discuss the potential to accelerate development of multifunctional structural concepts by provide air flow measurement and structural feedback during testing of complex structures. This could, in turn, eliminate some testing of intermediate elements in the slow and expensive traditional “building block” approach.
Jeffery W. Baur; Darren J. Hartl; Geoffrey J. Frank; Gregory Huff; Keith A. Slinker; Corey Kondash; W. Joshua Kennedy; Gregory J. Ehlert. Experimental Mechanics for Multifunctional Composites and Next Generation UAVs. Mechanics of Composite and Multi-functional Materials, Volume 6 2017, 215 -221.
AMA StyleJeffery W. Baur, Darren J. Hartl, Geoffrey J. Frank, Gregory Huff, Keith A. Slinker, Corey Kondash, W. Joshua Kennedy, Gregory J. Ehlert. Experimental Mechanics for Multifunctional Composites and Next Generation UAVs. Mechanics of Composite and Multi-functional Materials, Volume 6. 2017; ():215-221.
Chicago/Turabian StyleJeffery W. Baur; Darren J. Hartl; Geoffrey J. Frank; Gregory Huff; Keith A. Slinker; Corey Kondash; W. Joshua Kennedy; Gregory J. Ehlert. 2017. "Experimental Mechanics for Multifunctional Composites and Next Generation UAVs." Mechanics of Composite and Multi-functional Materials, Volume 6 , no. : 215-221.
This work presents distributed beamforming using three dimensional randomly distributed volumetric arrays. This work examines a statistical ensemble (mean-valued) of average beampattern behavior for canonical and non-canonical volumetrically bound distributed (random) antenna arrays. Cubical, cylindrical, and spherical topologies of isotropic elements are analyzed to show beamforming and scanning from zenith to meridian for canonical topologies. In addition, small amounts of work have previously been investigated and therefore this work helps to enlighten with illustrations of the beampattern phenomena of a select few non-conically bound distributed and volumetric structures. To validate the distributed array pattern behavior, the manifold is composed of one million isotropic radiators densely populated amongst geometrical bounds to examine characteristic pattern behavior. This provides faithful convergence of numerical beampatterns to their expected (mean) patterns. Last of all, results show an increasing complexity of pattern behavior for use in many spatial advancements in distributed beamforming.
Drew Overturf; Kris Buchanan; Jeff Jensen; Carlos Flores-Molina; Sara Wheeland; Gregory H. Huff. Investigation of beamforming patterns from volumetrically distributed phased arrays. MILCOM 2017 - 2017 IEEE Military Communications Conference (MILCOM) 2017, 817 -822.
AMA StyleDrew Overturf, Kris Buchanan, Jeff Jensen, Carlos Flores-Molina, Sara Wheeland, Gregory H. Huff. Investigation of beamforming patterns from volumetrically distributed phased arrays. MILCOM 2017 - 2017 IEEE Military Communications Conference (MILCOM). 2017; ():817-822.
Chicago/Turabian StyleDrew Overturf; Kris Buchanan; Jeff Jensen; Carlos Flores-Molina; Sara Wheeland; Gregory H. Huff. 2017. "Investigation of beamforming patterns from volumetrically distributed phased arrays." MILCOM 2017 - 2017 IEEE Military Communications Conference (MILCOM) , no. : 817-822.
Within this paper, we develop an extension to traditional graphical material selection techniques to create maps of the optimal materials for designs with limiting mechanisms which vary. We apply these techniques to pressurized structures that perform multiple functions and have functional systems embedded within them. Specifically, we consider a conceptual analysis for a pressurized radome and a microvascular composite with active thermal management. The latter is the basis for a liquid metal based Structurally Embedded Vascular Antenna (SEVA) with the potential to tune over a broad range of RF frequencies.
Jeffery W. Baur; Darren J. Hartl; Geoff J. Frank; Robyn Bradford; Gregory Huff. Graphical Material Selection Methods for Multi-Constraint, Multi-Functional Composites Pressure Vessels. Volume 1A: Codes and Standards 2017, 1 .
AMA StyleJeffery W. Baur, Darren J. Hartl, Geoff J. Frank, Robyn Bradford, Gregory Huff. Graphical Material Selection Methods for Multi-Constraint, Multi-Functional Composites Pressure Vessels. Volume 1A: Codes and Standards. 2017; ():1.
Chicago/Turabian StyleJeffery W. Baur; Darren J. Hartl; Geoff J. Frank; Robyn Bradford; Gregory Huff. 2017. "Graphical Material Selection Methods for Multi-Constraint, Multi-Functional Composites Pressure Vessels." Volume 1A: Codes and Standards , no. : 1.
Frequency tuning is investigated for a dipole-based frequency selective surface on a corrugated structure through origami folding. Three types of 1D folding patterns that alter the in-plane and out-of-plane element spacing at different rates are used to examine the frequency response in relation to spatial rearrangement. Folding decreases the in-plane spacing and leads to smaller Floquet periodicity lengths and a higher stop-band frequency. In some fold arrangements, folding increases the out-of-plane spacing and results in phase-shift and two distinct coupling modes.
Kazuko Fuchi; Giorgio Bazzan; Andrew S. Gillman; Gregory H. Huff; Philip R. Buskohl; Edward J. Alyanak. Frequency tuning through physical reconfiguration of a corrugated origami frequency selective surface. 2017 IEEE International Symposium on Antennas and Propagation & USNC/URSI National Radio Science Meeting 2017, 411 -412.
AMA StyleKazuko Fuchi, Giorgio Bazzan, Andrew S. Gillman, Gregory H. Huff, Philip R. Buskohl, Edward J. Alyanak. Frequency tuning through physical reconfiguration of a corrugated origami frequency selective surface. 2017 IEEE International Symposium on Antennas and Propagation & USNC/URSI National Radio Science Meeting. 2017; ():411-412.
Chicago/Turabian StyleKazuko Fuchi; Giorgio Bazzan; Andrew S. Gillman; Gregory H. Huff; Philip R. Buskohl; Edward J. Alyanak. 2017. "Frequency tuning through physical reconfiguration of a corrugated origami frequency selective surface." 2017 IEEE International Symposium on Antennas and Propagation & USNC/URSI National Radio Science Meeting , no. : 411-412.
This paper reports on the impact of UAV swarm density and heterogeneity on synthetic aperture DoA convergence. The synthetic aperture is derived from the displacement of distributed UAVs (agents) operating in a sparse volumetric swarm. Heterogeneity arises from the changing orientation of an agent's antenna and receiving pattern function as it swarms in the distributed cluster of agents. This alters the agents' antenna pattern function(s) over time and alters the convergence and overall performance properties of vector-space direction of arrival techniques. The goal of this work is to evaluate the impact of the swarm density and orientation in this framework and study the convergence and error using this technique under different SNR conditions using the MUSIC algorithm. Simulation and measurements for up to sixteen elements on a thirty-two-location test platform are provided and comparisons are made to benchmark their performance with theoretical expectations.
Zhong Chen; Jean-Francois Chamberland; Gregory H. Huff. Impact of UAV swarm density and heterogeneity on synthetic aperture DoA convergence. 2017 USNC-URSI Radio Science Meeting (Joint with AP-S Symposium) 2017, 3 -4.
AMA StyleZhong Chen, Jean-Francois Chamberland, Gregory H. Huff. Impact of UAV swarm density and heterogeneity on synthetic aperture DoA convergence. 2017 USNC-URSI Radio Science Meeting (Joint with AP-S Symposium). 2017; ():3-4.
Chicago/Turabian StyleZhong Chen; Jean-Francois Chamberland; Gregory H. Huff. 2017. "Impact of UAV swarm density and heterogeneity on synthetic aperture DoA convergence." 2017 USNC-URSI Radio Science Meeting (Joint with AP-S Symposium) , no. : 3-4.
The physical reconfiguration and deployment of a 2×2 corporate-fed microstrip patch antenna array is investigated. The origami-inspired antenna array reconfigures structurally using a Miura-ori fold pattern to deploy to/from a compact folded state from/to a flat state. The impact of folding on the electromagnetic performance is evaluated across a range of physical states to study the impact of physical reconfiguration. In particular, the input impedance and beamforming capabilities are used to characterize the performance as a function of the primary folding parameter. These performance metrics are impacted by a feed network that extends across the folds and the beamforming capabilities that are impacted by the changing element spacing and orientation. Results from simulation and a fabricated structure are provided for a 2.4 GHz design.
Steven R. Seiler; Giorgio Bazzan; Kazuko Fuchi; Edward J. Alanyak; Andrew Gillman; Gregory W. Reich; Philip R. Buskohl; Sumanna Pallampati; Deanna Sessions; David Grayson; Gregory H. Huff. Physical reconfiguration of an origami-inspired deployable microstrip patch antenna array. 2017 IEEE International Symposium on Antennas and Propagation & USNC/URSI National Radio Science Meeting 2017, 2359 -2360.
AMA StyleSteven R. Seiler, Giorgio Bazzan, Kazuko Fuchi, Edward J. Alanyak, Andrew Gillman, Gregory W. Reich, Philip R. Buskohl, Sumanna Pallampati, Deanna Sessions, David Grayson, Gregory H. Huff. Physical reconfiguration of an origami-inspired deployable microstrip patch antenna array. 2017 IEEE International Symposium on Antennas and Propagation & USNC/URSI National Radio Science Meeting. 2017; ():2359-2360.
Chicago/Turabian StyleSteven R. Seiler; Giorgio Bazzan; Kazuko Fuchi; Edward J. Alanyak; Andrew Gillman; Gregory W. Reich; Philip R. Buskohl; Sumanna Pallampati; Deanna Sessions; David Grayson; Gregory H. Huff. 2017. "Physical reconfiguration of an origami-inspired deployable microstrip patch antenna array." 2017 IEEE International Symposium on Antennas and Propagation & USNC/URSI National Radio Science Meeting , no. : 2359-2360.
This work statistically examines the receiver capabilities for circularly distributed ad-hoc array topologies of independently controlled element radiators. Performance metrics observed in this study include maximum SNR, tolerance on receiver amplitude variations, phase shifter accuracy and received signal strength variations in the presence of noise and fading.
Kristopher Buchanan; Oren Sternberg; Sara Wheeland; John Rockway; Jeffrey Jensen; Gregory Huff. Synchronization considerations using circularly distributed arrays. 2017 IEEE Radar Conference (RadarConf) 2017, 0157 -0162.
AMA StyleKristopher Buchanan, Oren Sternberg, Sara Wheeland, John Rockway, Jeffrey Jensen, Gregory Huff. Synchronization considerations using circularly distributed arrays. 2017 IEEE Radar Conference (RadarConf). 2017; ():0157-0162.
Chicago/Turabian StyleKristopher Buchanan; Oren Sternberg; Sara Wheeland; John Rockway; Jeffrey Jensen; Gregory Huff. 2017. "Synchronization considerations using circularly distributed arrays." 2017 IEEE Radar Conference (RadarConf) , no. : 0157-0162.
This work proposes a computer vision-based framework for analyzing and synthesizing the collaborative radiation behavior from swarming clusters of intelligent systems. Radiating sensor nodes with inertial measurement units and optical identification features represent the networked cluster of radiators. These create a set of object-distinguishable nodes on a reticulating platform capable of arbitrary spatial distributions. Node discovery and tracking algorithms based on open-source computer vision libraries use image and depth-of-field information from multi-spectral cameras. These locate nodes and their volumetric distribution within the cluster. An automated system then derives the weighted phases for collaborative beamforming from the resulting nodal distribution. Measured and simulated radiation patterns are gathered and compared to demonstrate the capability and accuracy of the proposed framework and to explore its usability in swarm applications.
J. S. Jensen; Kris Buchanan; J.-F. Chamberland; Gregory Huff. A computer vision-based framework for the synthesis and analysis of beamforming behavior in swarming intelligent systems. 2017 IEEE Radar Conference (RadarConf) 2017, 0118 -0122.
AMA StyleJ. S. Jensen, Kris Buchanan, J.-F. Chamberland, Gregory Huff. A computer vision-based framework for the synthesis and analysis of beamforming behavior in swarming intelligent systems. 2017 IEEE Radar Conference (RadarConf). 2017; ():0118-0122.
Chicago/Turabian StyleJ. S. Jensen; Kris Buchanan; J.-F. Chamberland; Gregory Huff. 2017. "A computer vision-based framework for the synthesis and analysis of beamforming behavior in swarming intelligent systems." 2017 IEEE Radar Conference (RadarConf) , no. : 0118-0122.