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# $W$ -Band Low-Profile Monopulse Slot Array Antenna Based on Gap Waveguide Corporate-Feed Network

### IEEE transactions on antennas and propagation. Volume 66:Number 12 (2018, November 29th); pp 6997-7009 -- [Institute of Electrical and Electronics Engineers]

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• Title:
$W$ -Band Low-Profile Monopulse Slot Array Antenna Based on Gap Waveguide Corporate-Feed Network
Zaman, Ashraf Uz;
Yang, Jian;
Zirath, Herbert;
Kishk, Ahmed A.;
Vosoogh, Abbas
• Found In: IEEE transactions on antennas and propagation. Volume 66:Number 12 (2018, November 29th); pp 6997-7009
• Journal Title: IEEE transactions on antennas and propagation
• Subjects: Antennas (Electronics)--Periodicals; Radio waves--Periodicals; Radio--Antennas; Radio--Periodicals; Antenna arrays--Waveguide discontinuities--Electromagnetic waveguides--Pins--Periodic structures--Slot antennas; Gap waveguide--high efficiency--integration--millimeter-wave--monopulse antenna--slot array antenna; Dewey: 621.3824
• Publication Details: [Institute of Electrical and Electronics Engineers]
• Abstract: This paper presents a gap waveguide-based compact monopulse array antenna, which is formed with four unconnected layers, for millimeter-wave tracking applications at $W$ -band (85–105 GHz). Recently developed gap waveguide technology removes the need for galvanic contact among metallic layers of waveguide structures, and thereby, makes the proposed antenna suitable for easy and low-cost manufacturing. In this context, a low-loss planar Magic-Tee is designed to be used in a monopulse comparator network consisting of two vertically stacked layers. The gap waveguide planar monopulse comparator network is integrated with a high-efficiency $16\times 16$ corporate-fed slot array antenna. The measured results of the comparator network show the amplitude and phase imbalance values to be less than 0.5 dB and 2°, respectively, over the frequency band of interest. The fabricated monopulse array antenna shows relative impedance bandwidths of 21% with input reflection coefficients better than −10 dB for the sum and difference ports. The null in the difference radiation pattern is measured to be 38 dB below the peak of the sum radiation pattern at 94 GHz. The measured gain is about 30 dBi for the same frequency. The low-loss performance of the comparator network and the feed network of the proposed array, together with the simple and easy manufacturing and mechanical assembly, makes it an excellent candidate for $W$ -band compact direction-finding systems.
• Identifier: System Number: ETOCvdc_100075377778.0x000001; Journal ISSN: 0018-926X; 10.1109/TAP.2018.2874427
• Publication Date: 2018
• Physical Description: Electronic
• Shelfmark(s): 4363.125100
• UIN: ETOCvdc_100075377778.0x000001