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A compact UWB‐BPF based on microstrip‐to‐CPW transition with multiple transmission zeros
Author(s) -
Ghazali Abu Nasar,
Sazid Mohd,
Virdee Bal
Publication year - 2018
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.31274
Subject(s) - passband , microstrip , stopband , coplanar waveguide , resonator , band pass filter , insertion loss , physics , electrical impedance , ultra wideband , electronic engineering , materials science , topology (electrical circuits) , optoelectronics , optics , telecommunications , microwave , computer science , engineering , electrical engineering , quantum mechanics
A hybrid microstrip‐to‐coplanar waveguide (CPW) based broadside coupled ultra‐wideband (UWB) bandpass filter (BPF) of compact nature with multiple transmission zeros (TZ) is proposed. The CPW in ground consists of a short circuited multiple mode resonator (MMR), which is in conjugation with two microstrip lines on the top, arranged in back‐to‐back manner. Initially, the impedance ratio of the MMR is adjusted to place its resonant modes quasi‐equally within the UWB passband and later the dimensions of microstrip lines are optimized to enhance the broadside coupling. The setup generates a passband with reduced insertion loss, small group delay and multiple TZ. The presence of TZs provide sharp roll‐offs at either passband edges and a wide stopband. The experimental BPF is fabricated and its measured data validated against simulation results. The proposed structure measures 14.6 × 9.6 mm 2 .