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Miniaturized wideband bandstop filter using an air‐bridge capacitor via gallium‐arsenide based integrated passive device technology
Author(s) -
Dhakal Rajendra,
Kim NamYoung
Publication year - 2016
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.29716
Subject(s) - band stop filter , capacitor , gallium arsenide , materials science , filter (signal processing) , return loss , optoelectronics , center frequency , microwave , wideband , electrical engineering , electronic engineering , band pass filter , low pass filter , telecommunications , engineering , voltage , antenna (radio)
This letter reports a new implementation of miniaturized wideband bandstop (WBBS) filter using a gallium‐arsenide (GaAs)‐based integrated passive device technology (IPD). The implementation of an air‐bridge capacitor explores the possibility of frequency selectivity from 8.15 to 9.20 GHz. The WBBS filter generates a return loss of −0.50 dB with a rejection depth of −38.01 dB at the resonance frequency of 9.20 GHz. The size of the filter was drastically reduced by implementing a microfabrication (IPD) with folded meandered‐line, featuring the length equal to 0.38 times the guided wavelength (λ g ) that occupies only 0.22 λ g × 0.13 λ g of the die area. The selectivity of the filter was reflected by the higher value of return loss with sufficient suppression of out‐of‐band signals close to the resonance frequency. Experimental verification of the filter response demonstrates its potential as a WBBS filter operating in the X‐band frequency spectrum. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:980–985, 2016