Compact Microstrip Tri-Band Bandpass Filter Using New Stubs Loaded Stepped-Impedance Resonator


This letter presents a completely unique tri-band bandpass filter (TB-BPF) based on proposed stubs loaded stepped-impedance resonator (SLSIR). The first three resonant modes of proposed SLSIR can be independently controlled by the shorted high-impedance section of SIR, the loaded open stub and also the loaded shorted stub, respectively, ensuing in the independency of central frequencies and come losses of three passbands. As an example, a TB-BPF operating at zero.9/1.8/a pair of.45 GHz are designed and fabricated. Due to the cancelling effect of mixed electrical and magnetic coupling, the virtual grounds existed in SLSIR and also the introduced embedded open stub, six transmission zeros are realized around three passbands, resulting in the high passband selectivity and band-to-band isolation. The fabricated TB-BPF also has a compact size of .

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