TY - GEN
T1 - Sharp-rejection broadband microstrip bandpass filters using loaded open-loop resonator
AU - Tu, Wen Hua
PY - 2010
Y1 - 2010
N2 - A broadband microstrip bandpass filter using loaded open-loop resonators is proposed. The basic block of the proposed filter is a triple-mode resonator consisting of a halfwave resonator and a loaded open loop. The first three resonances are of even, odd, and even modes, sequentially. The proposed resonator also provides two transmission zeros beside the passband for a sharp cut-off response. Two bandpass filters using the proposed resonator have been designed, fabricated, and tested to validate the design concept. For the first bandpass filter, from 2.3 to 3.9 GHz, the measured return loss is greater than 12 dB, and the measured insertion loss is less than 1.5 dB. The maximum group delay variation is 0.7 ns. Furthermore, there are two transmission zeros at 1.55 and 4.6 GHz for a sharp cutoff response. For the second bandpass filter, from 2.3 to 3.9 GHz, the measured return loss is greater than 10 dB, and the measured insertion loss is less than 2.5 dB. The roll-off rates are 136 dB/GHz and 167 dB/GHz at the lower and the higher stopbands, respectively.
AB - A broadband microstrip bandpass filter using loaded open-loop resonators is proposed. The basic block of the proposed filter is a triple-mode resonator consisting of a halfwave resonator and a loaded open loop. The first three resonances are of even, odd, and even modes, sequentially. The proposed resonator also provides two transmission zeros beside the passband for a sharp cut-off response. Two bandpass filters using the proposed resonator have been designed, fabricated, and tested to validate the design concept. For the first bandpass filter, from 2.3 to 3.9 GHz, the measured return loss is greater than 12 dB, and the measured insertion loss is less than 1.5 dB. The maximum group delay variation is 0.7 ns. Furthermore, there are two transmission zeros at 1.55 and 4.6 GHz for a sharp cutoff response. For the second bandpass filter, from 2.3 to 3.9 GHz, the measured return loss is greater than 10 dB, and the measured insertion loss is less than 2.5 dB. The roll-off rates are 136 dB/GHz and 167 dB/GHz at the lower and the higher stopbands, respectively.
KW - Broadband bandpass filter
KW - Transmission zero
KW - Triple-mode resonator
UR - http://www.scopus.com/inward/record.url?scp=77957806229&partnerID=8YFLogxK
U2 - 10.1109/MWSYM.2010.5516983
DO - 10.1109/MWSYM.2010.5516983
M3 - 會議論文篇章
AN - SCOPUS:77957806229
SN - 9781424477326
T3 - IEEE MTT-S International Microwave Symposium Digest
SP - 1696
EP - 1699
BT - 2010 IEEE MTT-S International Microwave Symposium, MTT 2010
T2 - 2010 IEEE MTT-S International Microwave Symposium, MTT 2010
Y2 - 23 May 2010 through 28 May 2010
ER -