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Wideband microstrip quasi-elliptic function bandpass filter with high out-of-band rejection

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Virdee, Bal Singh, Riaz, Muhammad, Shukla, Pancham, Onadim, Muhittin and Ouazzane, Karim (2019) Wideband microstrip quasi-elliptic function bandpass filter with high out-of-band rejection. Microwave and Optical Technology Letters, 61 (8). pp. 1993-1998. ISSN 1098-2760

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Abstract

Presented in this article is a novel and compact quasi-elliptic function bandpass filter based on microstrip technology that exhibits a high out-of-band rejection over a very wide frequency range. The design comprises stub-loaded halfwavelength resonators that are electromagnetically coupled to resonant structures that are interdigitally coupled to the input and output feed-lines. Perturbation introduced by the presence of the stub causes the resonators to act as a multimode device. In addition, the stub introduces two transmission zeros to significantly improve the filter’s passband selectivity and suppress harmonic and spurious modes. This configuration yields a wideband response with low insertion loss of 0.73 dB, high return-loss <20 dB, and out-of-band rejection level >40 dB across 2-4.5 GHz and 5.74-16 GHz. The planar filter structure can be easily manufactured using standard PCB technology.

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