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A tunable bandpass filter based on varactor loaded split‐ring resonators
Author(s) -
Genc Alper,
Baktur Reyhan
Publication year - 2009
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.24641
Subject(s) - varicap , band pass filter , electronic filter topology , butterworth filter , voltage controlled filter , materials science , prototype filter , optoelectronics , electronic engineering , filter (signal processing) , high pass filter , microstrip , band stop filter , resonator , microwave , engineering , electrical engineering , low pass filter , capacitance , physics , telecommunications , electrode , quantum mechanics
This article presents an electronically tunable varactor‐loaded microstrip bandpass filter based on the planar split ring resonators (SRRs). The varactor is a reverse‐biased semiconductor diode, and is connected between the concentric rings of the SRR. An individual varactor loaded SRR based bandpass tunable filter module is analyzed. Then a third order tunable filter with 2% fractional bandwidth and a tuning range from 2.11 to 2.34 GHz is assembled from basic filter modules. A prototype filter is designed, fabricated and tested. The maximum tuning range of the prototype filter is 10.2% and the size of the filter is reduced by a factor of 3.5 compared to a coupled line filter. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 2394–2396, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24641