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Microwave Tunable Notch Filter Based on Liquid Crystal Using Spiral Spurline Technology
Author(s) -
Torrecilla Javier,
AvilaNavarro E.,
Marcos Carlos,
Urruchi Virginia,
SanchezPena Jose M.,
Arias Julia,
SanchezLopez Maria M.
Publication year - 2013
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.27812
Subject(s) - microwave , band stop filter , materials science , microstrip , spiral (railway) , filter (signal processing) , resonator , optoelectronics , dielectric resonator , ranging , liquid crystal , dielectric , electronic engineering , electrical engineering , low pass filter , engineering , telecommunications , mechanical engineering
In this article, the design, fabrication, and characterization of a tunable microwave notch filter based on liquid crystal (LC) using inverted‐microstrip technology is presented. A spiral spurline structure is used because of its good performance as a single‐resonator notch filter. Based on the LC dielectric anisotropy, a voltage‐controlled rejection frequency of the filter is achieved, ranging from 3.40 to 3.75 GHz, which means that the tuning range relative to the central rejection frequency is about 10%. At the same time, this device exhibits negative group delay around the rejection frequency and the measured values throughout the tuning frequency range are presented. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:2420–2423, 2013
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