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A diplexer with direct coupled resonant junction
Author(s) -
Ogbodo Eugene A.,
Ngobigha Felix,
Obadiah Ali Nyangwarimam,
Atuba Sunday
Publication year - 2021
Publication title -
microwave and optical technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 76
eISSN - 1098-2760
pISSN - 0895-2477
DOI - 10.1002/mop.32787
Subject(s) - diplexer , resonator , band pass filter , helical resonator , physics , coupling (piping) , bandwidth (computing) , coupling coefficient of resonators , transmission line , dielectric resonator antenna , acoustics , topology (electrical circuits) , electronic engineering , telecommunications , optoelectronics , optics , electrical engineering , engineering , mechanical engineering
Abstract Conventionally, diplexers are designed by connecting two filters of different frequencies using a transmission T‐line junction which acts as a distribution network serving the individual filters. Here, a novel diplexer has been proposed and designed to utilize a directly coupled resonator as the distribution network. The directly coupled resonator is designed using two square open‐loop resonators of the same resonant frequency of 1.95 GHz. Coupling of the two resonators is achieved using a λ/4 transmission line to directly couple them. This process made the resonator pair to possess a dual‐mode resonator function, resonating at 1.85 and 2.05 GHz. Two bandpass filters are then designed in the corresponding modes of the resonator pair with 5% fractional bandwidth and coupled accordingly. This technique allowed the resonator pair to contribute to the resonant poles of the diplexer while functioning as the distribution network.