TY - JOUR
T1 - Compact electronically switchable parallel-coupled microstrip bandpass filter with wide stopband
AU - Lin, Yo Shen
AU - Chang, Po Ying
AU - Hsieh, Yu Shu
N1 - Funding Information:
Manuscript received October 1, 2007; revised January 4, 2008. This work was supported by the National Science Council of Taiwan, R.O.C., under Grant NSC 95-2221-E-008-022 and by the National Center for High-Performance Computing, Taiwan, R.O.C. The authors are with the Department of Electrical Engineering, National Central University, Chungli 320, Taiwan, R.O.C. (e-mail: [email protected]). Digital Object Identifier 10.1109/LMWC.2008.918892
PY - 2008/4
Y1 - 2008/4
N2 - In this letter, a compact electronically switchable parallel-coupled microstrip bandpass filter (BPF) based on quarter-wavelength resonators and p-i-n diode switch is proposed. The proposed filter occupies only half the circuit size of the conventional parallel-coupled filter. In addition, the type and length of each coupled-line section is suitably chosen such that the inherent transmission zeros associated with the coupled-lines can be used to reject the spurious passbands effectively. By adding only one p-i-n diode along with a simple bias control circuitry, the proposed filter becomes electronically switchable with no current consumption when the filter is turned off. Specifically, a switchable fourth-order microstrip BPF with a center frequency f0 of 2 GHz, passband insertion loss less than 3 dB, and wide stopband up to 7.7 f0 in the ON state is demonstrated. The isolation of the filter is better than 30 dB from dc up to 7.7 f0 in the OFF state.
AB - In this letter, a compact electronically switchable parallel-coupled microstrip bandpass filter (BPF) based on quarter-wavelength resonators and p-i-n diode switch is proposed. The proposed filter occupies only half the circuit size of the conventional parallel-coupled filter. In addition, the type and length of each coupled-line section is suitably chosen such that the inherent transmission zeros associated with the coupled-lines can be used to reject the spurious passbands effectively. By adding only one p-i-n diode along with a simple bias control circuitry, the proposed filter becomes electronically switchable with no current consumption when the filter is turned off. Specifically, a switchable fourth-order microstrip BPF with a center frequency f0 of 2 GHz, passband insertion loss less than 3 dB, and wide stopband up to 7.7 f0 in the ON state is demonstrated. The isolation of the filter is better than 30 dB from dc up to 7.7 f0 in the OFF state.
KW - Bandpass filter (BPF)
KW - Diode
KW - Microstrip
KW - Parallel-coupled
KW - Switchable
UR - http://www.scopus.com/inward/record.url?scp=41649090441&partnerID=8YFLogxK
U2 - 10.1109/LMWC.2008.918892
DO - 10.1109/LMWC.2008.918892
M3 - 期刊論文
AN - SCOPUS:41649090441
SN - 1531-1309
VL - 18
SP - 254
EP - 256
JO - IEEE Microwave and Wireless Components Letters
JF - IEEE Microwave and Wireless Components Letters
IS - 4
M1 - 4469942
ER -