Duplexer designed on the basis of microstrip filters using high dielectric constant substrates
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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 (ɛr = 92) are compared with duplexers manufactured on microwave ceramic materials with high values of ɛr. 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 × 3 mm and ɛr = 92.
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