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

Johanny Escobar-Pelaez | Zendy; JoséLuis OlveraCervantes | Zendy; Alonso CoronaChávez | Zendy; Humberto LobatoMorales | Zendy

Open Access

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

Author(s) -

Johanny Escobar-Pelaez,

JoséLuis OlveraCervantes,

Alonso CoronaChávez,

Humberto LobatoMorales

Publication year - 2012

Publication title -

progress in electromagnetics research letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.245

H-Index - 33

ISSN - 1937-6480

DOI - 10.2528/pierl12090309

Subject(s) - stopband , band pass filter , closed loop , loop (graph theory) , filter (signal processing) , materials science , electronic engineering , topology (electrical circuits) , control theory (sociology) , computer science , electrical engineering , mathematics , engineering , control engineering , combinatorics , control (management) , artificial intelligence

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.

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