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2024-08-27
A Novel Bandpass-to-All-Stop Switchable Absorptive Filter with Ultra-Wideband Reflectionless Range
By
Progress In Electromagnetics Research C, Vol. 147, 99-107, 2024
Abstract
A novel bandpass-to-all-stop switchable absorptive filter with an ultra-wideband reflectionless range is proposed in this paper. The bandpass section of the filter consists of a dual-mode resonator and two L-shaped feeding lines. The dual-port reflectionless characteristic is achieved by loading absorption networks at the end of the open stubs of the feeding lines, which are composed of two parallel coupled lines and absorption resistors. The switching of the reflectionless bandpass filter (RBPF) to the all-stop filter (ASF) is realized by controlling the on/off behavior of the PIN diode through the bias voltage. Measurements show that the filter prototype at the center frequency of 2.43 GHz with the 3-dB fractional bandwidth (FBW) is 8.23%. For the RBPF state, the filter has an ultra-wideband reflectionless FBW of 214% and upper stopband rejection better than 33 dB up to 6 GHz. Besides, the rejection is better than 30 dB from 0 to 5.32 GHz in the ASF state.
Citation
Bingjie Yang, Zhongbao Wang, Shipeng Zhao, Hongmei Liu, Mingming Gao, and Shao-Jun Fang, "A Novel Bandpass-to-All-Stop Switchable Absorptive Filter with Ultra-Wideband Reflectionless Range," Progress In Electromagnetics Research C, Vol. 147, 99-107, 2024.
doi:10.2528/PIERC24071301
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