A constant absolute bandwidth tunable band-pass filter based on magnetic dominated mixed coupling and source–load electric coupling

Dengyao Tian, Quanyuan Feng and Qianyin Xiang

Journal of Electromagnetic Waves and Applications, 2016, vol. 30, issue 15, 1953-1963

Abstract: In this paper, a constant absolute bandwidth (CABW) band-pass filter based on magnetic dominated mixed coupling and source–load electric coupling is proposed. Specially, a novel mixed electric and magnetic coupling structure is presented to control the coupling coefficient variation and thus realize a narrow CABW width. Two transmission zeros are added to the filter response using a source–load coupling technique, leading to a better selectivity. The measurement shows that the –1 dB absolute and fractional bandwidth is 29 ± 3 MHz and 1.8–2.6%, respectively, while the central frequency of the passband varies from 1.11 to 1.51 GHz.

Date: 2016
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DOI: 10.1080/09205071.2016.1226965

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