%0 Conference Paper
%A Zahari, M.K.
%A Ahmad, B.H.
%A Wong, P.W.
%A Shairi, N.A.
%D 2017
%F scholars:8578
%I Institute of Electrical and Electronics Engineers Inc.
%K Crystal resonators; Microwave filters; Notch filters; Resonators; Semiconductor diodes, absorptive; Band pass; Band-stop; Low-loss; Switchable filters, Bandpass filters
%P 513-516
%R 10.1109/APMC.2017.8251494
%T Switchable bandstop to bandpass filter using parallel-coupled resonator
%U https://khub.utp.edu.my/scholars/8578/
%X A new prototype of switchable bandstop to bandpass filter was designed and fabricated by using parallel-coupled lossy resonator. The lossy resonator topology was used to partially compensate for the losses. The fundamentals of having two lossy Q resonator structures are that it exhibits a bandpass filter, where the parallel-coupled resonator is disconnected with the λ/4 wavelength. PIN diodes are used to change the filter's response. In the experiments, the filter exhibited a high-Q bandstop response when the PIN diodes were switched 'ON' with an operating frequency of 2.4GHz, an attenuation of 75dB and return loss S11 > 20dB. The lossy bandpass filter was produced when the PIN diodes were switched 'OFF'. The theoretical analysis together with the fabrication results were presented in this paper. © 2017 IEEE.
%Z cited By 6; Conference of 2017 IEEE Asia Pacific Microwave Conference, APMC 2017 ; Conference Date: 13 November 2017 Through 16 November 2017; Conference Code:134147