2009
DOI: 10.1049/el.2009.3555
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Compact dual-band bandpass filter using trisection hairpin resonator for GPS and WLAN applications

Abstract: A compact dual-band bandpass filter using trisection hairpin-shape resonators has been designed and fabricated. Measured results are in good agreement with electromagnetic simulation results and verify that two central frequencies of the fabricated filter are located at about 1.57 GHz (GPS application) and 2.40 GHz (WLAN application). The measured return losses in both 1.57 and 2.40 GHz bands are higher than 16 dB while the measured insertion losses are about 1 dB in the two passbands. The circuit size of the … Show more

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Cited by 21 publications
(12 citation statements)
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“…In the past few years, the stepped-impedance resonators (SIRs) [1][2][3] had been widely applied not only to restrain the spurious responses, but also shorten the resonator size. Required filter central frequency can be obtained conveniently by adjusting the impedance ratio of each SIR section.…”
Section: Introductionmentioning
confidence: 99%
“…In the past few years, the stepped-impedance resonators (SIRs) [1][2][3] had been widely applied not only to restrain the spurious responses, but also shorten the resonator size. Required filter central frequency can be obtained conveniently by adjusting the impedance ratio of each SIR section.…”
Section: Introductionmentioning
confidence: 99%
“…Many methods on designing dual-band BPFs have been explored and reported. The usually method is to utilize the harmonic effects of stepped impedance resonators, the two resonant frequencies of which can be controlled by the impedance ratio and electrical length of two sections [1][2]. Although the passband frequencies can be tuned to desirable values, the bandwidths of dual-bands can hardly be regulated at the same time or the selectivity needs to be improved.…”
Section: Introductionmentioning
confidence: 99%
“…But this solution increases the insertion loss and the overall size of a resultant filter block. The stepped‐impedance resonators were used to make up filters with dual passbands [2–4]. Central frequencies are determined by the aspect ratio of the two characteristic impedances.…”
Section: Introductionmentioning
confidence: 99%