Compact Elliptic-Function Low-Pass Filter Using Defected Ground Structure

Author

Yang, Jinping ; Wu, Wen

Author_Institution

Sch. of Electron. Eng. & Optoelectron. Technol., Nanjing Univ. of Sci. & Technol., Nanjing

Volume

18

Issue

9

fYear

2008

Firstpage

578

Lastpage

580

Abstract

A novel elliptic-function low-pass filter (LPF) is presented, which consists of a dumb-bell-shaped defected ground structure (DB-DGS), a spiral-shaped defected ground structure (SP-DGS) and a broadened microstrip line. The DB-DGS provides the required wideband attenuation in stopband, while the SP-DGS provides steep transition from passband to stopband. A 2.4 GHz five-pole LPF is developed and experimental results show that it has a sharp cutoff frequency response. The measured passband insertion-loss is below 0.3 dB, and the rejection band over 20 dB is from 2.95 to 8.25 GHz.

Keywords

UHF filters; band-pass filters; band-stop filters; elliptic filters; frequency response; low-pass filters; microstrip lines; microwave filters; broadened microstrip line; compact elliptic-function low-pass filter; dumb-bell-shaped defected ground structure; frequency 2.4 GHz; frequency 2.95 GHz to 8.25 GHz; loss 0.3 dB; passband filter; passband insertion-loss; rejection band; sharp cutoff frequency response; spiral-shaped defected ground structure; steep transition; stopband filter; wideband attenuation; Attenuation; Band pass filters; Capacitance; Circuit simulation; Cutoff frequency; Equivalent circuits; Low pass filters; Passband; RLC circuits; Resonance; Defected ground structure (DGS); elliptic-function filter; low-pass filter (LPF);

fLanguage

English

Journal_Title

Microwave and Wireless Components Letters, IEEE

Publisher

ieee

ISSN

1531-1309

Type

jour

DOI

10.1109/LMWC.2008.2002447

Filename

4624612