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A novel duplexer for UMTS applications based on a cross‐coupled filter
Author(s) -
Cabral H. A.,
Bezerra S. T. G.,
de Melo M. T.
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.25590
Subject(s) - duplexer , resonator , umts frequency bands , bandwidth (computing) , insertion loss , microwave , electronic engineering , wideband , materials science , band pass filter , optoelectronics , computer science , engineering , electrical engineering , telecommunications , antenna (radio)
A novel duplexer design based on cross‐coupled resonators is presented which has the advantages of small size and reasonably sharp cutoff frequency. A duplexer for the UMTS upload and download bands is fabricated and the measured response is shown to be in close agreement to full‐wave simulations. The fractional bandwidth for both bands is about 3%. The duplexer has an insertion loss of less than 1 dB and provides more than 20 dB of isolation. Lumped‐element models for both the resonator and duplexer are derived and their responses are also shown to be very close to the simulated results, which make them potentially very useful since it can simplify the design of systems using the duplexer. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52:2792–2795, 2010; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25590