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2022-02-16
Highly Selective UWB Bandpass Filter with Multi-Notch Characteristics Using Comb Shaped Resonator
By
Progress In Electromagnetics Research M, Vol. 108, 89-101, 2022
Abstract
This paper aims to present a highly selective, compact size new ultra-wideband (UWB) bandpass filter with three sharp notches for UWB indoor applications. The fundamental geometry of the filter is based on modified multi-mode resonator (MMR) structure which comprises a open-ended step impedance resonator (SIR) attached to an interdigitated uniform impedance resonator (UIR). Realizing a Comb-shaped resonator structure below the UIR and symmetrically extending the lower arm edge of the interdigital coupled lines, three notches are generated at 6 GHz, 6.53 GHz, and 8.35 GHz. These notches have improved the UWB bandpass filter responses by suppressing the existing interferences in the UWB passband created by Wi-Fi 6E (6 GHz), super-extended C band (6.425 GHz~6.725 GHz), X band satellite communications for satellite TV networks or raw satellite feeds (7.25 GHz~8.395 GHz). Concurrently the notched band filter has achieved superiority in other salient features concerning passband and stop band of the filter such as a high passband fractional bandwidth (115.76%), low return loss (-13.27 dB), low insertion loss (0.44 dB~0.97 dB), wide upper stop band (5.37 GHz), nearly flat group delay (0.28 ns~0.45 ns) etc. The ultimate design of UWB bandpass filter is fabricated and verified by comparing the simulated filter responses with the measured results indicating a good agreement.
Citation
Piali Chakraborty Partha Pratim Shome Jyoti Ranjan Panda Arindam Deb , "Highly Selective UWB Bandpass Filter with Multi-Notch Characteristics Using Comb Shaped Resonator," Progress In Electromagnetics Research M, Vol. 108, 89-101, 2022.
doi:10.2528/PIERM21112601
http://www.jpier.org/PIERM/pier.php?paper=21112601
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