Packaged SIW Filtering Antenna Array With High Selectivity and Harmonic Suppression for Satellite Communications

ABSTRACT This paper introduces an innovative four‐channel filtering power divider with cross‐coupling, leading to the design of two Substrate integrated waveguide (SIW) filtering antenna arrays. A 2 × 2 antenna array with varying phases and multiple radiation zeros is developed, achieving a compact size and effective stopband suppression, thereby enhancing signal transmission and radiation characteristics. Experimental results reveal a S 11 ≤ −10 dB and a peak gain of 9.5 dBi within the 12–13 GHz passband, alongside the generation of five radiation zeros outside the passband. And next, the paper elaborates on the principle of harmonic suppression and its equivalent spur line structure model, incorporating these into the filtering divider. By extending the microstrip feeder and utilizing stacking technology, a 4 × 4 antenna array with a wide stopband and multiple zeros is realized, significantly improving radiation effects. Final test results indicate an in‐band peak gain of 14.1 dBi, out‐of‐band selectivity of 114.65 dBi/GHz and 67.8 dBi/GHz, and an S 11 ≤ −15 dB. The stopband extends to 1.85 f 0 with an attenuation exceeding 16.1 dBi, with the radiation direction aligning closely with simulation results. These features position the antenna as a formidable candidate in field of satellite communications.