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Millimeter-Wave Circularly Polarized Array Antenna Using Substrate-Integrated Gap Waveguide Sequentially Rotating Phase Feed
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DOI：10.1109/LAWP.2019.2910657.png)
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Abstract
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A substrate-integrated gap waveguide (SIGW) sequentially rotating phase (SRP)-fed 2x2 circularly polarized (CP) patch antenna array is presented for the wideband millimeter-wave application. The antenna element is composed of a truncated square patch, SIGW feedline with three layers of printed circuit board (PCB), and another layer of PCB with an air hole for supporting radiation patch. Each radiation patch is driven by an underneath coupling slot etched onSIGW. Awide axial-ratio (AR) bandwidth is achieved by deploying a 2x2 SIGW SRP feed network. Moreover, simple calculation expressions of the characteristic impedance and guide wavelength of SIGW are given for the design of SRP feed network. The fabricated prototype shows an impedance bandwidth of 25.6% covering 22.2-28.8 GHz, 3 dB AR bandwidth of 19% from 22.8 to 27.6 GHz, and peak gain of 11.53 dBic.
Keywords:
Antenna array
circularly polarized (CP)
millimeter-wave (MMW)
substrate integrated gap waveguide (SIGW)
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