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Compact sub‐wavelength microstrip band‐reject filter based on inter‐digital capacitance loaded loop resonators
Author(s) -
Peng Yi,
Zhang WenXun
Publication year - 2010
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.24885
Subject(s) - resonator , microstrip , bandwidth (computing) , microwave , insertion loss , capacitance , center frequency , optoelectronics , band pass filter , materials science , filter (signal processing) , electronic engineering , electrical engineering , physics , engineering , telecommunications , electrode , quantum mechanics
In this article, the microstrip band‐reject filters based on inter‐digital capacitance loaded loop resonators (IDCLLRs) are proposed by using meandered microstip‐line, which enhances the coupling to the resonators and provides more structural parameters for flexible design. First, an IDCLLR‐based single‐stage meandered prototype of band‐reject filter has been designed and fabricated. The measured frequency response shows 2.2% relative stop‐bandwidth (−10 dB) with −21 dB maximal insertion‐loss at 3.34 GHz. Furthermore, the resonant frequencies versus inter‐digital length are studied. Finally, an IDCLLR‐based three‐stage meandered prototype of band‐reject filter was designed and fabricated too, the measured relative stop‐bandwidth (−10 dB) is 6.2% and the insertion‐loss at center frequency approaches −42 dB. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 166–169, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24885