Substrate-integrated-waveguide-fed slotted patch filtering antenna and array with enhanced selectivity

• Published in: International journal of electronics and communications Vol. 172; p. 154936
• Main Authors: Huang, Ye-Xin, Yan, Yu-Xing, Tang, Shi-Chang, Yu, Wei, Chen, Jian-Xin
• Format: Journal Article
• Language: English
• Published: Elsevier GmbH 01.12.2023
• Subjects: Enhanced selectivity; Filtenna array; Radiation null; Slotted patch antenna; Substrate integrated waveguide (SIW); Substrate integrated waveguide (SIW); Filtenna array; Radiation null; Slotted patch antenna; Enhanced selectivity
• ISSN: 1434-8411; 1618-0399
• DOI: 10.1016/j.aeue.2023.154936

In this paper, a slotted patch filtering antenna fed by substrate integrated waveguide (SIW) cavity is investigated. The microstrip patch (MP) acts as not only a radiator but also the last resonator of the bandpass filter (BPF) for synthesizing the filtering response. Furthermore, a pair of slots is etched on the MP to introduce a controllable radiation null at the upper passband edge without adding additional filtering circuits, resulting in an enhanced filtering response with a sharp band skirt. More importantly, the mentioned way can be easily transferred to design filtenna array. For demonstration, a prototype of 2 × 2 slotted patch filtenna array with a center frequency of 13.6 GHz is designed, fabricated and measured. The measurement results exhibit that the proposed slotted patch filtenna array possesses flat passband gain with a peak gain of 12.9 dBi, an 88% peak efficiency and a radiation null at 14.64 GHz. Good agreement between the simulation and measured results is observed.