High selective microstrip bandpass filter and diplexer with common magnetic coupling

High selective microstrip bandpass filter and diplexer with common magnetic coupling

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A new common magnetic coupling structure has been proposed. A high selective microstrip bandpass filter and a diplexer with the common magnetic coupling and 0° feeding have been developed. A pair of transmission zeros can be generated by 0° feeding, while an additional transmission zero can be produced by the common magnetic coupling structure and can be controlled/adjusted by the electric/magnetic couplings. The proposed diplexer has been fabricated and measured, and the measurement shows a channel insertion loss of <1.3 dB, and an isolation of not <34 dB. The measured results agree with the prediction.


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      • 4. Choocadee, S., Intarawiset, N., Tantiviwat, S.: ‘Compact microstrip diplexer using triple-mode stub loaded resonators’. 2017 IEEE MTT-S Int. Conf. on Microwaves for Intelligent Mobility (ICMIM), Nagoya, Japan, March 2017, pp. 912.
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