Selectivity improved directional filters using cross-coupling introduced transmission zeros

Jakub Sorocki, Kamil Staszek, Ilona Piekarz, Slawomir Gruszczynski and Krzysztof Wincza

Journal of Electromagnetic Waves and Applications, 2019, vol. 33, issue 16, 2126-2141

Abstract: In this paper, the realization of traveling-wave directional filters allowing for selectivity improvement without increasing filter’s order is presented and studied. It is shown that the introduction of loose cross-coupling between #(n-1)th loop resonator and isolated port of the nth-order directional filter allows for generating transmission zeros in the bandpass branch and thus to improve the filter`s roll-off. Moreover, the electrical length of the cross-coupling connecting transmission line allows for adjusting the location of transmission zeros and realizing symmetric or asymmetric frequency response. The presented approach is theoretically analyzed and experimentally verified. Exemplary second- and third-order directional filters with symmetrically placed transmission zeros were designed to operate at f0 = 1 GHz, manufactured and measured. The obtained results prove their applicability towards the realization of frequency multiplexers.

Date: 2019
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DOI: 10.1080/09205071.2019.1663371

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