Journal
JOURNAL OF COMMUNICATIONS TECHNOLOGY AND ELECTRONICS
Volume 57, Issue 6, Pages 649-655Publisher
PLEIADES PUBLISHING INC
DOI: 10.1134/S1064226912030187
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A microstrip duplexer for a modification of a PCS communication system operating at frequencies of 1.84-1.87 and 1.75-1.78 GHz is described. The duplexer containing microstrip bandpass filters on high dielectric constant substrates (E > (r) = 92) are compared with duplexers manufactured on microwave ceramic materials with high values of E > (r) . The microstrip bandpass filters use stepped-impedance resonators placed one near another with a gap of 0.1-0.2 mm. It is shown that the microstrip duplexer has slightly lower insertion loss and occupies smaller volume than a duplexer using coaxial dielectric resonators having a rectangular cross section of 3 x 3 mm and E > (r) = 92.
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