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Davoud Zarifi
School of Electrical and Computer Engineering, University of Kashan, Kashan, Iran

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Article
Published: 18 August 2021 in Journal of Infrared, Millimeter, and Terahertz Waves
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A broadband magic-T junction for millimeter-wave applications is proposed in this article. Gap waveguide technology is employed to overcome fabrication and assembly challenges at millimeter-wave frequencies. The measured results for a fabricated prototype are in good agreement with the simulations. The measurements indicate that the fabricated structure exhibits 28% impedance bandwidth and isolation better than 69 dB between E- and H-arms in the Ka-band. In addition, the measured coupling level between the collinear arms is less than −18.6 dB. The proposed structure is compact and simple, has high power and low loss, and is suitable for low-cost fabrication to utilize in a wide variety of millimeter-wave and microwave applications.

ACS Style

Marzie Nasri; Davoud Zarifi. A Broadband Gap Waveguide-Based Magic-T Junction for Millimeter-Wave Applications. Journal of Infrared, Millimeter, and Terahertz Waves 2021, 1 -9.

AMA Style

Marzie Nasri, Davoud Zarifi. A Broadband Gap Waveguide-Based Magic-T Junction for Millimeter-Wave Applications. Journal of Infrared, Millimeter, and Terahertz Waves. 2021; ():1-9.

Chicago/Turabian Style

Marzie Nasri; Davoud Zarifi. 2021. "A Broadband Gap Waveguide-Based Magic-T Junction for Millimeter-Wave Applications." Journal of Infrared, Millimeter, and Terahertz Waves , no. : 1-9.

Journal article
Published: 10 August 2021 in Sensors
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A novel wideband high-power single-pole two-throw (SP2T) switch based on gap waveguide technology is presented in this article. The proposed switch has a SP2T structure and consists of three standard WR62 waveguide ports. Due to the advantage of gap waveguide technology, the switch design structure requires no electrical contact between its different parts, and the leakage of the electromagnetic wave is suppressed. The proposed switch has an air gap between its parts. As a result, the sliding part of the switch can be moved freely to change the switch states. Consequently, a low-precision and low-cost fabrication can be utilized. The simulation and measurement of the proposed switch indicate that a 50% operating frequency bandwidth covering the range of 12–20 GHz can be achieved. The switch input return-loss is better than 15 dB within the frequency bandwidth, whereas the insertion loss and isolation levels of the proposed design are above 0.15 dB and better than 65 dB, respectively.

ACS Style

Abdullah J. Alazemi; Ali Farahbakhsh; Davoud Zarifi. A 12–20 GHz Wideband High-Power SP2T Switch Based on Gap Waveguide Technology. Sensors 2021, 21, 5396 .

AMA Style

Abdullah J. Alazemi, Ali Farahbakhsh, Davoud Zarifi. A 12–20 GHz Wideband High-Power SP2T Switch Based on Gap Waveguide Technology. Sensors. 2021; 21 (16):5396.

Chicago/Turabian Style

Abdullah J. Alazemi; Ali Farahbakhsh; Davoud Zarifi. 2021. "A 12–20 GHz Wideband High-Power SP2T Switch Based on Gap Waveguide Technology." Sensors 21, no. 16: 5396.

Journal article
Published: 25 June 2021 in IEEE Transactions on Antennas and Propagation
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This article deals with the design and development of supershaped monocone and rotationally symmetric monopole antennas with omnidirectional radiations to cover an ultra-wide frequency bandwidth. The attractive feature of supercurves is their ability to generate various complex and non-intuitive curves and shapes through a simple mathematical equation called superformula. In the proposed designs, the surface profiles of monocone and rotationally symmetric monopole antennas are expressed using supercurves and the six unknown parameters of superformula are optimized to fulfill the bandwidth and radiation pattern requirements. The use of supercurves is extremely effective in reducing computational complexity and saving a lot of computation time. The electromagnetic performances of the proposed antennas are investigated by the simulations and experiments. The measured results reveal that the proposed monopoles satisfactory radiation characteristics over the 26:1 and 43:1 impedance bandwidths. The findings are valuable for the design and evaluation of ultra-wideband antennas and the proposed monopoles can be used as good candidates at various communication applications.

ACS Style

Mohammad Hossein Gandomi; Davoud Zarifi. Design and Development of Ultra-Wideband 3-D Monopole Antennas Based on Supercurves. IEEE Transactions on Antennas and Propagation 2021, PP, 1 -1.

AMA Style

Mohammad Hossein Gandomi, Davoud Zarifi. Design and Development of Ultra-Wideband 3-D Monopole Antennas Based on Supercurves. IEEE Transactions on Antennas and Propagation. 2021; PP (99):1-1.

Chicago/Turabian Style

Mohammad Hossein Gandomi; Davoud Zarifi. 2021. "Design and Development of Ultra-Wideband 3-D Monopole Antennas Based on Supercurves." IEEE Transactions on Antennas and Propagation PP, no. 99: 1-1.

Review article
Published: 22 December 2020 in IETE Journal of Research
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The design, development and fabrication of compact microstrip ring-hybrid couplers are presented in the present paper. In order to obtain miniaturization, λ/4 microstrip lines in a conventional microstrip ring-hybrid are equivalently substituted with quarter-wavelength supershape transmission lines. The results show that almost 74% size reduction can be achieved as compared to a conventional ring-hybrid. For verification purpose, a sample prototype has been designed, manufactured and tested. The fabricated compact ring-hybrid coupler operates at 1.3 GHz with low amplitude and phase imbalances. The acceptable agreement between the measurement and stimulation results validates the performance of presented coupler. The proposed ring-hybrid is compact, simple, single layer, cheap and suitable for planar fabrication for utilizing in modern communication systems.

ACS Style

Azam Tayebi; Davoud Zarifi. On the Miniaturization of Microstrip Ring-Hybrid Couplers Using Gielis Supershapes. IETE Journal of Research 2020, 1 -6.

AMA Style

Azam Tayebi, Davoud Zarifi. On the Miniaturization of Microstrip Ring-Hybrid Couplers Using Gielis Supershapes. IETE Journal of Research. 2020; ():1-6.

Chicago/Turabian Style

Azam Tayebi; Davoud Zarifi. 2020. "On the Miniaturization of Microstrip Ring-Hybrid Couplers Using Gielis Supershapes." IETE Journal of Research , no. : 1-6.

Journal article
Published: 15 February 2020 in AEU - International Journal of Electronics and Communications
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Due to the development of mobile communication devices, the miniaturized antenna design is becoming an important consideration today. In this paper, a new small microstrip antenna is proposed in which the patch is curved along its width to force the electrical currents to move in a longer path. Consequently, the electrical size of patch is increased so that its physical size is decreased to almost 63.5% of the size of common rectangular patch antenna. Furthermore, the measurement results show that the return loss of the proposed antenna is enhanced compared to the rectangular patch antenna while their radiation patterns are the same.

ACS Style

Ali Farahbakhsh; Davoud Zarifi. Miniaturization of patch antennas by curved edges. AEU - International Journal of Electronics and Communications 2020, 117, 153125 .

AMA Style

Ali Farahbakhsh, Davoud Zarifi. Miniaturization of patch antennas by curved edges. AEU - International Journal of Electronics and Communications. 2020; 117 ():153125.

Chicago/Turabian Style

Ali Farahbakhsh; Davoud Zarifi. 2020. "Miniaturization of patch antennas by curved edges." AEU - International Journal of Electronics and Communications 117, no. : 153125.

Review article
Published: 09 February 2020 in International Journal of RF and Microwave Computer-Aided Engineering
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This article deals with the design of a broadband cavity‐backed microstrip‐fed wide‐slot antenna array for L‐band applications. For verification purpose, a sample 1 × 4‐element antenna array has been designed, manufactured and tested. Experimental results have shown satisfactory agreement with the simulation. The proposed antenna array exhibits a measured impedance bandwidth of 1.4 GHz (90%) with frequency of 0.85 to 2.25 GHz and the gain is higher than 11 dBi. The designed antenna has small size and low weight and can be fabricated using a low‐cost fabrication process for easy integration with RF circuits and microwave components. This work is useful for some radar applications and radio frequency identification systems.

ACS Style

Davoud Zarifi; Ali Ahmadi. A broadband slant polarized cavity backed microstrip‐fed wide‐slot antenna array. International Journal of RF and Microwave Computer-Aided Engineering 2020, 30, 1 .

AMA Style

Davoud Zarifi, Ali Ahmadi. A broadband slant polarized cavity backed microstrip‐fed wide‐slot antenna array. International Journal of RF and Microwave Computer-Aided Engineering. 2020; 30 (5):1.

Chicago/Turabian Style

Davoud Zarifi; Ali Ahmadi. 2020. "A broadband slant polarized cavity backed microstrip‐fed wide‐slot antenna array." International Journal of RF and Microwave Computer-Aided Engineering 30, no. 5: 1.

Journal article
Published: 22 January 2020 in IEEE Access
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ACS Style

Marzieh Nasri; Davoud Zarifi; Ashtaf Uz Zaman. A Wideband 3-dB Directional Coupler in GGW for Use in V-Band Communication Systems. IEEE Access 2020, 8, 17819 -17823.

AMA Style

Marzieh Nasri, Davoud Zarifi, Ashtaf Uz Zaman. A Wideband 3-dB Directional Coupler in GGW for Use in V-Band Communication Systems. IEEE Access. 2020; 8 ():17819-17823.

Chicago/Turabian Style

Marzieh Nasri; Davoud Zarifi; Ashtaf Uz Zaman. 2020. "A Wideband 3-dB Directional Coupler in GGW for Use in V-Band Communication Systems." IEEE Access 8, no. : 17819-17823.

Journal article
Published: 19 December 2019 in IEEE Antennas and Wireless Propagation Letters
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In this paper, H-plane horn antenna using gap waveguide technology is proposed. The advantage of this tech- nology is its air-filled feature, which improves the impedance matching compared with substrate integrated waveguide horn antennas. Corrugated walls as soft surfaces are used on the outer surfaces of the upper and lower horn plates, which act as barriers around the aperture of the antenna and reduce its back lobe levels. The bandwidth of the antenna for jS11j < 10 dB is 19 to 28 GHz and the gain varies between 8.5 and 12 dBi. The total efficiency is better than 88% in the operation bandwidth. This structure has the capability of easily integrating with other planar microwave components. To such a capability, a coupled resonator filter has been integrated with the antenna to select the desired frequency band and remove the out of band harmonics. For the proof of concept a prototype model is fabricated and tested, where measurement data agree well with the simulation results.

ACS Style

Mahsa Hamedani; Homayoon Oraizi; Amrollah Amini; Davoud Zarifi; Ashraf Uz Zaman. Planar H-Plane Horn Antenna Based on Groove Gap Waveguide Technology. IEEE Antennas and Wireless Propagation Letters 2019, 19, 302 -306.

AMA Style

Mahsa Hamedani, Homayoon Oraizi, Amrollah Amini, Davoud Zarifi, Ashraf Uz Zaman. Planar H-Plane Horn Antenna Based on Groove Gap Waveguide Technology. IEEE Antennas and Wireless Propagation Letters. 2019; 19 (2):302-306.

Chicago/Turabian Style

Mahsa Hamedani; Homayoon Oraizi; Amrollah Amini; Davoud Zarifi; Ashraf Uz Zaman. 2019. "Planar H-Plane Horn Antenna Based on Groove Gap Waveguide Technology." IEEE Antennas and Wireless Propagation Letters 19, no. 2: 302-306.

Research article
Published: 09 December 2019 in International Journal of RF and Microwave Computer-Aided Engineering
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This article deals with the design of Moreno cross‐guide couplers based on supershapes for X‐band applications. Crossed‐waveguide couplers are mainly used due to their compact structures. In these couplers, cross‐aperture structures are usually employed to offer flat coupling and high isolation. In the present article, the possible shapes for apertures and metal inserts that can be derived by the superfomula curves are explored and the effects of variations of superformula parameters are investigated on the performance of Moreno coupler. Finally, the proposed Moreno coupler is validated through fabrication and measurement. The experimental validation shows an excellent agreement with the simulated results. In the frequency range from 8 to 12.5 GHz, the measured coupling value changes from 18.8 to 20.8 dB and the directivity is better than 38 dB and 29 dB from 8 to 11 GHz and 11 to 12.5 GHz, respectively. The results are valuable for the design and evaluation of broadband high directive waveguide couplers.

ACS Style

Azam Tayebi; Davoud Zarifi; Marzieh Nasri. Design of X‐band Moreno cross‐guide coupler based on superformula curves. International Journal of RF and Microwave Computer-Aided Engineering 2019, 30, 1 .

AMA Style

Azam Tayebi, Davoud Zarifi, Marzieh Nasri. Design of X‐band Moreno cross‐guide coupler based on superformula curves. International Journal of RF and Microwave Computer-Aided Engineering. 2019; 30 (3):1.

Chicago/Turabian Style

Azam Tayebi; Davoud Zarifi; Marzieh Nasri. 2019. "Design of X‐band Moreno cross‐guide coupler based on superformula curves." International Journal of RF and Microwave Computer-Aided Engineering 30, no. 3: 1.

Journal article
Published: 02 July 2019 in IEEE Access
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A class of wideband directional couplers suitable for achieving different coupling levels are proposed in this work. The proposed couplers have been implemented using double-layer groove gap waveguide at millimeter-wave frequency range. They are composed of two parallel groove gap waveguide parts placed on top of each other in such a way that the coupling between the two waveguide sections can be achieved via the coupling structures placed in the common wall. Usually, the coupling layer consists of two rows of holes and depending on the number of holes the coupling levels can be controlled. The manifest and applicable property of the proposed directional coupler is that the coupling level can be simply changed using the different coupling layers without changing the top and bottom groove waveguides and transitions. As another significant advantage of the proposed coupler, there is no requirement of good electrical contact among different metallic parts of the structure which considerably simplifies the manufacturing processes and mechanical assembly at millimeter-waves applications. For verification purpose, three sample couplers with coupling levels of 10 dB, 20 dB and 30 dB have been designed, fabricated and measured. To make the device accessible and measurable using standard rectangular waveguides, two types of transitions from groove gap waveguide to standard WR-15 are designed. Simulation and experimental results are in good agreement and show that the proposed couplers have large bandwidth for return loss level of 20 dB, coupling level of 10±1, 20±1 and 30±1 dB, and isolation level of 30, 35 and 40 dB over the desired frequency band of 50 -70 GHz. The proposed directional couplers can be used as good candidates at millimeter-wave frequencies for probing and the design of compact integrated microwave circuits and systems such as antenna array feeding networks.

ACS Style

Davoud Zarifi; Ali Farahbakhsh; Ashraf Uz Zaman. Design and Fabrication of Wideband Millimeter-Wave Directional Couplers With Different Coupling Factors Based on Gap Waveguide Technology. IEEE Access 2019, 7, 88822 -88829.

AMA Style

Davoud Zarifi, Ali Farahbakhsh, Ashraf Uz Zaman. Design and Fabrication of Wideband Millimeter-Wave Directional Couplers With Different Coupling Factors Based on Gap Waveguide Technology. IEEE Access. 2019; 7 (99):88822-88829.

Chicago/Turabian Style

Davoud Zarifi; Ali Farahbakhsh; Ashraf Uz Zaman. 2019. "Design and Fabrication of Wideband Millimeter-Wave Directional Couplers With Different Coupling Factors Based on Gap Waveguide Technology." IEEE Access 7, no. 99: 88822-88829.

Research article
Published: 04 September 2018 in International Journal of RF and Microwave Computer-Aided Engineering
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A groove gap waveguide diplexer is presented for Ku‐band applications. The manifest advantage of using this technology is its ability to remove requirement of electrical contact between the different layers of the structure. The proposed diplexer is composed of coupled gap waveguide resonators without additional waveguide elements. A prototype is fabricated and measured for experimental verification. The return losses of the channel filters of diplexer are higher than about 20 dB, in the desired frequency bands centered 14 and 15.5 GHz. A high degree of agreement between the measurements and simulations has been found.

ACS Style

Davoud Zarifi; Alireza Shater; Atefe Ashrafian; Marzieh Nasri. Design of Ku‐band diplexer based on groove gap waveguide technology. International Journal of RF and Microwave Computer-Aided Engineering 2018, 28, 1 .

AMA Style

Davoud Zarifi, Alireza Shater, Atefe Ashrafian, Marzieh Nasri. Design of Ku‐band diplexer based on groove gap waveguide technology. International Journal of RF and Microwave Computer-Aided Engineering. 2018; 28 (9):1.

Chicago/Turabian Style

Davoud Zarifi; Alireza Shater; Atefe Ashrafian; Marzieh Nasri. 2018. "Design of Ku‐band diplexer based on groove gap waveguide technology." International Journal of RF and Microwave Computer-Aided Engineering 28, no. 9: 1.

Journal article
Published: 11 December 2017 in IEEE Transactions on Antennas and Propagation
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A wideband 8 ×8-element slot antenna array based on ridge gap waveguide feeding network has been proposed for mmWave applications. The antenna sub-array consists of four radiating slots which are excited by a groove gap cavity layer. Compared with previously published works, the proposed planar antenna array has quite wide impedance bandwidth. The antenna covers a wide band of 50-67.8 GHz with 30% impedance bandwidth (VSWR < 2). Also, the antenna has only 2.5 dB gain variation over the entire bandwidth which implies also good radiation characteristics for the proposed antenna. The maximum measured gain value is about 27.5 dBi with a total efficiency of 80% for the proposed antenna within the band of interest. With this performance, the proposed antenna array is a promising candidate for millimeter-wave communication systems.

ACS Style

Ali Farahbakhsh; Davoud Zarifi; Ashraf Uz Zaman. A mmWave Wideband Slot Array Antenna Based on Ridge Gap Waveguide With 30% Bandwidth. IEEE Transactions on Antennas and Propagation 2017, 66, 1008 -1013.

AMA Style

Ali Farahbakhsh, Davoud Zarifi, Ashraf Uz Zaman. A mmWave Wideband Slot Array Antenna Based on Ridge Gap Waveguide With 30% Bandwidth. IEEE Transactions on Antennas and Propagation. 2017; 66 (2):1008-1013.

Chicago/Turabian Style

Ali Farahbakhsh; Davoud Zarifi; Ashraf Uz Zaman. 2017. "A mmWave Wideband Slot Array Antenna Based on Ridge Gap Waveguide With 30% Bandwidth." IEEE Transactions on Antennas and Propagation 66, no. 2: 1008-1013.

Journal article
Published: 03 July 2017 in IEEE Transactions on Antennas and Propagation
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This communication presents a wideband aperture-coupled patch antenna array based on ridge gap waveguide feed layer for 60-GHz applications. The novelty of this antenna lies in the combination of relatively new gap waveguide technology along with conventional patch antenna arrays allowing to achieve a wideband patch antenna array with high gain and high radiation efficiency. An 8 × 8-element array antenna is designed, fabricated, and tested. Experimental results show that the bandwidth of VSWR . 2 is up to 15.5% (57.5-67.2 GHz). More than 75% efficiency and higher than 21.5-dBi gain are achieved over the operational bandwidth. The results are valuable for the design and evaluation of wideband planar antenna arrays at millimeter-wave frequencies.

ACS Style

Davoud Zarifi; Ali Farahbakhsh; Ashraf Uz Zaman. A Gap Waveguide-Fed Wideband Patch Antenna Array for 60-GHz Applications. IEEE Transactions on Antennas and Propagation 2017, 65, 4875 -4879.

AMA Style

Davoud Zarifi, Ali Farahbakhsh, Ashraf Uz Zaman. A Gap Waveguide-Fed Wideband Patch Antenna Array for 60-GHz Applications. IEEE Transactions on Antennas and Propagation. 2017; 65 (9):4875-4879.

Chicago/Turabian Style

Davoud Zarifi; Ali Farahbakhsh; Ashraf Uz Zaman. 2017. "A Gap Waveguide-Fed Wideband Patch Antenna Array for 60-GHz Applications." IEEE Transactions on Antennas and Propagation 65, no. 9: 4875-4879.

Article
Published: 16 May 2017 in Microwave and Optical Technology Letters
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In this letter, a groove gap waveguide (GGW) based 3-dB directional coupler is proposed. The designed component is composed of three parts: GGW structure, extra matching pins and GGW to standard SMA transition. The designed quadrature 3-dB coupler is optimized to work in the Ku-band covering 13–15 GHz. Measured results show that over 14.3% bandwidth, 20 dB isolation and 1.2 VSWR is achieved. The main advantage of GGW-based components is that it does not require good electrical contact among different metallic parts of the structure which considerably simplifies the manufacturing processes and hence reduces cost especially for millimeter-waves applications.

ACS Style

D. Zarifi; A. R. Shater. DESIGN of a 3-DB directional coupler based on groove gap waveguide technology. Microwave and Optical Technology Letters 2017, 59, 1597 -1600.

AMA Style

D. Zarifi, A. R. Shater. DESIGN of a 3-DB directional coupler based on groove gap waveguide technology. Microwave and Optical Technology Letters. 2017; 59 (7):1597-1600.

Chicago/Turabian Style

D. Zarifi; A. R. Shater. 2017. "DESIGN of a 3-DB directional coupler based on groove gap waveguide technology." Microwave and Optical Technology Letters 59, no. 7: 1597-1600.

Journal article
Published: 10 May 2016 in IEEE Transactions on Antennas and Propagation
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A wideband high-gain high-efficiency 16 × 16-element slot antenna array is presented for 60-GHz band applications. The antenna is designed based on gap waveguide technology. The most important advantage of using this technology is its ability to decrease complexity and cost of fabrication because there is no requirement of electrical contact between the three layers of the antenna structure. The three layers are a corrugated metal plate with radiating slots, a subarray cavity layer, and a ridge gap waveguide (RGW) feed network layer. The corporate feed network is realized by a texture of pins and guiding ridges in a metal plate. Also, in order to excite the antenna with a standard V-band rectangular waveguide, a transition from RGW to WR-15 is designed. The radiating elements, corrugations, cavity layer, power dividers, and transition are designed and optimized to suppress the reflection coefficient at the input WR-15 port over the desired frequency range from 57 to 66 GHz. Finally, the 16 × 16-element slot antenna array is fabricated by the standard milling technology. The measured results demonstrate about 16% of reflection coefficient bandwidth (|S 11 | <; -10 dB) covering the 56-65.7-GHz frequency range, and the measured gain is larger than 32.5 dBi over the band with more than 70% antenna efficiency.

ACS Style

Davoud Zarifi; Ali Farahbakhsh; Ashraf Uz Zaman; Per-Simon Kildal. Design and Fabrication of a High-Gain 60-GHz Corrugated Slot Antenna Array With Ridge Gap Waveguide Distribution Layer. IEEE Transactions on Antennas and Propagation 2016, 64, 2905 -2913.

AMA Style

Davoud Zarifi, Ali Farahbakhsh, Ashraf Uz Zaman, Per-Simon Kildal. Design and Fabrication of a High-Gain 60-GHz Corrugated Slot Antenna Array With Ridge Gap Waveguide Distribution Layer. IEEE Transactions on Antennas and Propagation. 2016; 64 (7):2905-2913.

Chicago/Turabian Style

Davoud Zarifi; Ali Farahbakhsh; Ashraf Uz Zaman; Per-Simon Kildal. 2016. "Design and Fabrication of a High-Gain 60-GHz Corrugated Slot Antenna Array With Ridge Gap Waveguide Distribution Layer." IEEE Transactions on Antennas and Propagation 64, no. 7: 2905-2913.