info:eu-repo/semantics/article
A bandpass filter with compact size and extended stopband using closed-loop transmission-lines and short-circuited stubs
Autor
Johanny Alberto Escobar Peláez
JOSE LUIS OLVERA CERVANTES
ALONSO CORONA CHAVEZ
Humberto Lobato Morales
Resumen
A novel 3-pole bandpass filter (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 0:0727λg X 0:079λg, where λg is the guided wave length. A BPF at the center frequency of f₀ = 1:9 GHz with stopband extended up to 7.8 GHz (= 4 f₀) is developed showing good agreement between simulation and experimental results.
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