Compact dual-band bandpass filter using stepped impedance resonators

Author

Xubo Wei ; Bo Ding ; Guotao Yue ; Chao Wang ; Zetao He ; Yu Shi

Author_Institution

Res. Inst. of Electron. Sci. & Technol., Univ. of Electron. Sci. & Technol. of China (UESTC), Chengdu, China

fYear

2014

fDate

12-15 Aug. 2014

Firstpage

1299

Lastpage

1301

Abstract

A modified λ /4 stepped impedance resonator (SIR) is proposed, in which a shunt open stub is loaded between the low impedance line and high impedance line of a conventional λ /4 SIR. Based on this modified λ/4 SIR a compact dual-band bandpass filter (BPF) with high selectivity is presented. Two transmission zeros (TZs) are generated near each passband for high selectivity. To demonstrate this method, a 2.4/5.2 GHz dual-band BPF for WLAN application has been designed, fabricated and measured. The measurement result shows four finite TZs in the stopband, located at 1.82, 3.14, 5.35, and 7.63GHz, respectively. The circuit only occupies 0.06 λg×0.09 λg.

Keywords

band-pass filters; microwave filters; resonator filters; wireless LAN; SIR; WLAN application; compact dual-band bandpass filter; dual-band BPF; frequency 1.82 GHz; frequency 2.4 GHz; frequency 3.14 GHz; frequency 5.2 GHz; frequency 5.35 GHz; frequency 7.63 GHz; shunt open stub; stepped impedance resonators; transmission zeros; Band-pass filters; Couplings; Dual band; Filtering theory; Impedance; Passband; Resonant frequency; BPF SIRs transmission zeros WLAN;

fLanguage

English

Publisher

ieee

Conference_Titel

Electronic Packaging Technology (ICEPT), 2014 15th International Conference on

Conference_Location

Chengdu

Type

conf

DOI

10.1109/ICEPT.2014.6922882

Filename

6922882