Combline filters designed on symmetric stripline
- Autores: Zakharov A.1, Il’chenko M.1, Trubarov I.1
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Afiliações:
- Kyiv Polytechnic Institute (National Technical University of Ukraine)
- Edição: Volume 62, Nº 6 (2017)
- Páginas: 626-633
- Seção: Novel Radio Systems and Elements
- URL: https://journals.rcsi.science/1064-2269/article/view/198461
- DOI: https://doi.org/10.1134/S1064226917060262
- ID: 198461
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Resumo
Problems arising during the design of stripline combline filters, which until quite recently were considered as all-stop microwave structures, are considered. It has been shown that the electromagnetic coupling coefficient of quarter-wave stripline resonators increases with the value of material permittivity εr, the operating frequency, and the thickness of the filter resonators. For εr = 92 and a thickness of stripline resonators of 4 mm, it exceeds 12% at frequencies higher than 2.2 GHz. Two alternative versions of combline filters have been designed: a filter with a coupling strip and a filter without a coupling strip. Experimental data for a nine-resonator combline filter with a thickness of 4 mm, εr = 9.7, and the center frequency f0 = 2.4 GHz are presented. A method for increasing the selectivity of combline filters with the same number of resonators is proposed. It has been found that amplitude–frequency responses of stripline combline filters are near-symmetric, unlike the responses of microstrip combline filters.
Sobre autores
A. Zakharov
Kyiv Polytechnic Institute (National Technical University of Ukraine)
Autor responsável pela correspondência
Email: a.zakharov@bk.ru
Ucrânia, Kyiv, 03056
M. Il’chenko
Kyiv Polytechnic Institute (National Technical University of Ukraine)
Email: a.zakharov@bk.ru
Ucrânia, Kyiv, 03056
I. Trubarov
Kyiv Polytechnic Institute (National Technical University of Ukraine)
Email: a.zakharov@bk.ru
Ucrânia, Kyiv, 03056