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A novel 3-pole bandpass fllter (BPF) based on microstrip loaded ring resonators (LRRs) is proposed. Each resonator comprises a closed-loop transmission line and a short-circuited stub. By properly adjusting the impedance and the electrical length of each resonator, the proposed circuit may be made compact (over 93.7% smaller than a conventional ring resonator) and its stopband may be extended simultaneously. Each resonator exhibits an area of 0:0727‚g £ 0:079‚g, where ‚g is the guided wave length. A BPF at the center frequency of f0 = 1:9GHz with stopband extended up to 7.8GHz (= 4f0) is developed showing good agreement between simulation and experimental results.

A BANDPASS FILTER WITH COMPACT SIZE AND EXTENDED STOPBAND USING CLOSED-LOOP TRANSMISSION-LINES AND SHORT-CIRCUITED STUBS