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This paper proposes a substrate integrated waveguide (SIW) filtering slot antenna. Based on four SIW cavity resonators and a slot locating on the last resonator, a filtering antenna was designed, targeting the near 20 GHz satellite communication band. Simulated in the Ansys-HFSS commercial software, it exhibits a 10 dB impedance bandwidth of 1.5 GHz and a flat gain of 5.5 dBi in the operating frequency band. Besides, the filtering antenna has good selectivity at passband edges and features such as compact size, low profile, and low cost, making it suitable for Ka-band satellite ground terminals. Key-Words: Substrate integrated waveguide, filtering antenna, slot antenna, cavity resonator. Received: February 3, 2021. Revised: March 30, 2021. Accepted: April 2, 2021. Published: April 6, 2021.

Substrate Integrated Waveguide Filtering Slot Antenna for Ka-Band Satellite Communications