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

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 / Description

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.

Item Type:	Article
Uncontrolled Keywords:	quasi-elliptic bandpass filter, interdigital coupled feed-line, wideband, wide stopband
Subjects:	600 Technology > 620 Engineering & allied operations
Department:	School of Computing and Digital Media
Depositing User:	Bal Virdee
Date Deposited:	15 Apr 2019 08:30
Last Modified:	17 Apr 2020 15:09
URI:	https://repository.londonmet.ac.uk/id/eprint/4744

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