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Tunable sharp notch filter for UWB application
Author(s) -
Yamamoto Yasuhisa,
Li Keren,
Hashimoto Osamu
Publication year - 2008
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.23773
Subject(s) - band stop filter , stopband , varicap , resistor , stub (electronics) , bandwidth (computing) , microwave , electronic engineering , capacitor , passband , band pass filter , optoelectronics , materials science , electrical engineering , filter (signal processing) , low pass filter , engineering , voltage , physics , telecommunications , capacitance , electrode , quantum mechanics
This article presents a novel tunable sharp notch filter using open stub structure with varactor for implementing detect‐and‐avoid method into ultrawideband radio system. On the basis of the experimental results on the open stub structure with lumped capacitor, we introduced two techniques in this work to realize a tunable sharp notch filter using open stub structure with varactor to perform narrow stopband and using resistors to build a DC bias circuit, so that no influence to the tunable notch filter over a wide band. The developed tunable notch filter has excellent performance: wide tuning range from 3.65 to 4.35 GHz with low tuning voltage from 0 to 6 V, narrow bandwidth less than 270 MHz of the notch filter (at 10 dB insertion loss at 0 V), and compact size of the developed filter: about 2.0 cm × 4.0 cm. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2712–2715, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23773