A Compact Low Pass Filter Design with Assigned Transmission Zeros

Author

Tseng, Jan-Dong ; Ko, Rong-Jie

Author_Institution

Inst. of Inf. & Electr. Energy, Nat. Chin-Yi Univ. of Technol., Taichung

fYear

2007

fDate

11-14 Dec. 2007

Firstpage

1

Lastpage

4

Abstract

A combined C-section coupled lines low pass filter by setting transmission zeros to control its stop band bandwidth and frequency response slope near 3 dB cutoff frequency is proposed. The circuit analysis is performed by transmission line model of coupled lines for extracting the equivalent circuits of individual parts of the circuit. The circuit design uses reactances of the equivalent circuits to assign transmission zeros and applies an extra transmission zero to increase frequency slope near 3 dB cutoff frequency. A prototype with 3 dB cutoff frequency at 2.45 GHz and transmission zero at the second harmonic was designed, simulated, fabricated, and measured. The simulated data and the experimental results show a good agreement from 0 to 10 GHz.

Keywords

equivalent circuits; low-pass filters; C-section coupled lines; equivalent circuit; frequency response; low pass filter design; stop band bandwidth; transmission line model; Bandwidth; Circuit analysis; Circuit simulation; Coupling circuits; Cutoff frequency; Distributed parameter circuits; Equivalent circuits; Filtering theory; Frequency response; Low pass filters; C-section coupled line; low-pass; transmission zero;

fLanguage

English

Publisher

ieee

Conference_Titel

Microwave Conference, 2007. APMC 2007. Asia-Pacific

Conference_Location

Bangkok

Print_ISBN

978-1-4244-0748-4

Electronic_ISBN

978-1-4244-0749-1

Type

conf

DOI

10.1109/APMC.2007.4554645

Filename

4554645