A Tunable Three-Pole 1.5–2.2-GHz Bandpass Filter With Bandwidth and Transmission Zero Control

Author

Chiou, Yi-Chyun ; Rebeiz, Gabriel M.

Author_Institution

Electr. & Comput. Eng. Dept., Univ. of California San Diego, La Jolla, CA, USA

Volume

59

Issue

11

fYear

2011

Firstpage

2872

Lastpage

2878

Abstract

This paper presents a three-pole tunable combline bandpass filter with center frequency, bandwidth, and zero control. The filter is designed on a Duroid substrate with εr=10.2 and h=25 mil . A frequency range of 1.5-2.2 GHz with a 1-dB bandwidth tuning from 50 to 170 MHz (2.2%-11.2% fractional bandwidth) is achieved. The transmission zero can also be controlled, and a zero location of 1.37-1.64 GHz is demonstrated at center frequency fo of 2.05 GHz. The measured third-order intermodulation intercept point and 1-dB power compression point at midband (1.85 GHz) and a bandwidth of 110 MHz are >;15 and 8 dBm, respectively. To our knowledge, this is the first three-pole combline tunable bandpass filter with center frequency, bandwidth, and transmission zero control.

Keywords

band-pass filters; intermodulation; Duroid substrate; bandwidth control; frequency 1.2 GHz to 2.2 GHz; power compression point; third-order intermodulation intercept point; transmission zero control; tunable three-pole bandpass filter; Band pass filters; Bandwidth; Couplings; Filtering theory; Frequency measurement; Resonant frequency; Tuning; Bandwidth tunable filter; combline filter; transmission zero control; tunable filter;

fLanguage

English

Journal_Title

Microwave Theory and Techniques, IEEE Transactions on

Publisher

ieee

ISSN

0018-9480

Type

jour

DOI

10.1109/TMTT.2011.2164619

Filename

6018322