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Wideband SIW Filtering Antenna With Controllable Radiation Nulls Using Dual-Mode Cavities

2021; IEEE Antennas & Propagation Society; Volume: 20; Issue: 9 Linguagem: Inglês

10.1109/lawp.2021.3097214

1548-5757

Hanyu Xie, Bian Wu, Yuelin Wang, Chi Fan, Jianzhong Chen, Tao Su,

Advanced Antenna and Metasurface Technologies

A wideband fourth-order filtering antenna consists of two substrate integrated waveguide (SIW) dual-mode cavities is presented in this letter. The first SIW cavity creates two resonant nodes and one radiation null (RN) located on the upper stopband. The second SIW cavity integrated with a slot cannot only achieve radiation function but also realize dual-mode resonance, which can produce another lower out-of-band RN. These two RNs can be controlled to improve frequency selectivity and design flexibility. The coupling matrix theory is adopted to guide the design of the filtering antenna, and the generation principle of these two RNs can be explained by cross coupling. Finally, such a filtering antenna operating at the center frequency of 5.4 GHz with a fractional bandwidth of 7.64% and a maximum gain of 5.3 dBi is fabricated and measured.