Prof. Dr. Carlos Del Río Bocio

A Novel Methodology to Feed Phased Array Antennas

Arnulfo R. Gutierrez

This article presents a new design of an ultra-wideband conformal antenna for Unmanned Aerial Vehicle (UAV) applications. The antenna is a low-profile structure which is very suitable to diminish aerial vehicle drag problem. The design utilizes Rogers Duroid 5880LZ material with dimensions of 29 mm W 39 mm. The measurement results show an ultrawideband performance of the S11<-10dB from 2.9 GHz to 15.9 GHz. A Y-rounded shape achieves this frequency range with a parasitic circular element at the center of the structure. The acceptable radiation pattern performance is until 10.1 GHz, and the system fidelity factor is SFF>0.9 in the maximum radiation. The proposed antenna was simulated and measured to test its performance when it is mounted on an UAV model.

4 September 2007 in IEEE Transactions on Antennas and Propagation

Journal Article

Diego Betancourt

Design of UAVs-Based 3D Antenna Arrays for a Maximum Performance in Terms of Directivity and SLL

A new methodology to design beam-forming networks (BFN) to feed antenna arrays is introduced. Using this methodology is feasible to reduce the complexity of the associate control of a phased array, since, an N by N antenna array could be controlled to steer the beam using four phase shifters instead of the N² conventionally used. A prototype was designed, built and measured as proof of concept. The prototype consists on 3 by 3 Quasi-Yagi antennas fed by four input-ports. The measurements show that the main beam of an antenna array fed by this BFN can be steered to any desired direction.

30 August 2016 in International Journal of Antennas and Propagation

Journal Article

Jesus Garza

Gerardo Romero

An Innovative Way of Using Coherently Radiating Periodic Structures for Phased Arrays With Reduced Number of Phase Shifters

This paper presents a design of UAVs-based 3D antenna arrays for a maximum performance in terms of directivity and side lobe level (SLL). This paper illustrates how to model the UAVs formation flight using 3D nonuniform antenna arrays. This design of 3D antenna arrays considers the optimization of the positions of the antenna elements to model the UAVs formation flight. In this case, a disk patch antenna is chosen to be used as element in each UAV. The disk patch antenna is formulated by the well-known cavity model. The synthesis process is carried out by the method of Differential Evolution for Multiobjective Optimization (DEMO). Furthermore, a comparison of the performance of 3D nonuniform antenna arrays is provided with respect to the most conventional arrays (circular, planar, linear, and the cubic) for UAVs formation flight.

19 July 2021 in IEEE Transactions on Antennas and Propagation

Journal Article

Elizvan Juárez

David H Covarrubias

Brian Julian Sanchez Ruiz

Choked Gaussian antenna: extremely low sidelobe compact antenna design

This article presents an innovative design technique for feeding phase antenna arrays using coherently radiating periodic structure (CORPS) technology for reducing the number of phase shifters (PSs) in limited-scan applications with low sidelobe level (SLL). The proposed configuration is implemented taking advantage of the phase interpolation property of a CORPS network of one layer. This configuration is built by interconnecting $2\times 3$ CORPS networks in a strategic way in order to provide a reduction in the number of PSs while maintaining the scanning capability. Experimental results and full-wave simulations based on CST Microwave Studio reveal that the proposed design technique reduces the recombination losses and generates a better phase slope with respect to the basic CORPS network providing a reduction in the number of PSs. As a novel contribution, this article provides the full antenna system design in order to analyze and study the PSs reduction performance and scanning capabilities of the proposed technique to feed linear antenna arrays. The proposed design technique provides a reduction in the number of PSs for a scanning range of ±25° in linear arrays. The array design model includes the application of the raised cosine amplitude distribution to generate a radiation pattern with minimum SLL. The linear array system was validated by experimental measurements of the full system prototype and full-wave simulations results are provided to verify the accuracy of the array model and to take mutual coupling into account. The proposed case provides a good design compromise with respect to other cases in the state of the art.

1 January 2002 in IEEE Antennas and Wireless Propagation Letters

Journal Article

Jorge Teniente

D. Goni

Ramón Gonzalo

Design of concentric ring antenna arrays for isoflux radiation in GEO satellites

A new concept of a really compact corrugated horn antenna for global coverage with very low sidelobe and cross-polar level and quite wide bandwidth is presented in this letter. This consists on the concatenation of a choke antenna together with a Gaussian profile horn antenna. A comparison of the performances of this horn design versus other author designs is included. A prototype was manufactured and measured and the results demonstrate excellent agreement with theoretical simulations.

1 January 2011 in IEICE Electronics Express

Journal Article