Design of Compact Bandpass Filters with λg/4 Short Stubs Using Transmission Zero

Author

Nam, Hee ; Yun, Tae-Soon ; Yoon, Ki-Cheol ; Lee, Jong-Chul

Author_Institution

RFIC Educ. & Res. Center, Kwangwoon Univ., Seoul

fYear

2006

fDate

10-15 Sept. 2006

Firstpage

1252

Lastpage

1255

Abstract

In this paper, compact bandpass filters with λ_g/4 short stubs by microstrip line on duroid substrate are presented. This kind of filter shows flexible bandwidth with variation of the position of the short stub using the external quality factor, Q_e without changing the impedance value at microwave. This filter provides compact design and sharp skirt characteristic by transmission-zero. The bandpass filters can be realized with wide (60 %) and narrow (10 %) bandwidth just by adjusting the position of the short stubs. They show the insertion losses of 0.5 dB and 1.5 dB, and the return losses of 10 dB and 13 dB at the center frequency of 2 GHz, respectively.

Keywords

Q-factor; band-pass filters; microstrip lines; microwave filters; 0.5 dB; 1.5 dB; 10 dB; 13 dB; 2 GHz; compact bandpass filter; duroid substrate; external quality factor; flexible bandwidth; insertion loss; microstrip line; microwave impedance value; return loss; sharp skirt characteristic; short stub filter; transmission zero; Band pass filters; Bandwidth; Filtering theory; Frequency; Impedance; Integrated circuit technology; Microstrip filters; Microwave filters; Q factor; Superconducting transmission lines; Short stub filter; external quality factor; transmission-zero;

fLanguage

English

Publisher

ieee

Conference_Titel

Microwave Conference, 2006. 36th European

Conference_Location

Manchester

Print_ISBN

2-9600551-6-0

Type

conf

DOI

10.1109/EUMC.2006.281222

Filename

4058056