Microstrip triplexer designed with new miniature Resonator has been proposed in this paper. Because of the controllable finite transmission zeros, high selectivity and planar structure, the microstrip triplexer based on crosscouple structure possesses broad application foreground in radar receiving system. In the thesis, an improved SIR resonator is proposed, and a compact triplexer whose central frequencies and RBWs are 1.37GHz with 4%, 1.52GHz with 5%, and 1.7GHz with 5% is designed. Compared with other microstrip triplexers there are many merits. First, it's smaller in size. Second, because of the SIR structure, the spurious passband can be controlled, then it will suppress the harmonic effectively. Third, the two transmission zeroes that synthesized by the General Chebyshev function strengthen the restrain of the near band, and improve isolations between channels filter either.
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