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Reconfigurable bandpass filter with electric coupling and constant absolute bandwidth
Author(s) -
Chen ZhiHan,
Chu QingXin
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.29835
Subject(s) - band pass filter , bandwidth (computing) , fractional bandwidth , resonator , center frequency , microwave , constant (computer programming) , electrical engineering , physics , electronic engineering , optoelectronics , engineering , materials science , computer science , telecommunications , programming language
This paper presents a reconfigurable bandpass filter (BPF) with constant absolute bandwidth (ABW). The structure is composed of a pair of novel half wavelength (λ/2) resonators with two center‐tapped var actors. Frequency tuning is made possible by modifying the electrical length of the resonators with four varactors. Following the traditional synthesis approach, the internal coupling is analyzed and designed properly to meet the requirement of constant ABW. At last, the proposed filter exhibits a 49% fractional tuning range from 500 to 825 MHz, and a near constant 3‐dB bandwidth of 56 ± 5 MHz. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:1401–1404, 2016