Miniaturized SIW filter using D-shaped resonators with wide out-of-band rejection for 5G applications

Tharani Duraisamy, Rusan Kumar Barik, Qingsha S. Cheng, Selvajyothi Kamakshy and Karthikeyan Sholampettai Subramanian

Journal of Electromagnetic Waves and Applications, 2020, vol. 34, issue 18, 2397-2409

Abstract: In this article, substrate integrated waveguide (SIW) filter with compact size and wide out-of-band rejection is designed for 5G (sub-6 GHz) applications. To achieve the proposed filter responses, D-shaped resonators oriented face-to-face are etched out on the top layer of SIW. Due to the resonators loading, the filter provides a passband below the cut-off frequency of SIW. This decrease in the operating frequency of the filter allows us to achieve size miniaturization. To enhance the frequency responses, a double-stage SIW filter is proposed and investigated. The equivalent electrical-circuits are developed to validate the transmission responses. To support our claim, single- and double-stage SIW filters are designed, fabricated and tested. The filter prototypes achieve size miniaturization, low insertion loss and wide out-of-band responses. The measured responses are very similar to the full-wave simulation responses.

Date: 2020
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DOI: 10.1080/09205071.2020.1816219

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