Design of Microstrip Lossy Filter Using an Extended Doublet Topology

Author

Jia Ni ; Wenxing Tang ; Jiasheng Hong ; Geschke, Riana H.

Author_Institution

Dept. of Electr., Electron. & Comput. Eng., Heriot-Watt Univ., Edinburgh, UK

Volume

24

Issue

5

fYear

2014

fDate

May-14

Firstpage

318

Lastpage

320

Abstract

A lossy three-pole microstrip bandpass filter using an extended doublet network is proposed in this letter. Nonuniform Q distribution is considered by reducing the Qu of one resonator, resulting in a flatter passband with an enhanced selectivity. Also, the novel feeding network adopted brings about two extra transmission zeros and a wide stopband that further improve the filter performance. Good agreement between the simulated and measured results can be observed to validate the design.

Keywords

band-pass filters; band-stop filters; microstrip filters; network topology; poles and zeros; resonator filters; extended doublet network topology; feeding network; lossy three-pole microstrip bandpass filter design; nonuniform Q distribution; resonator; stopband filter; transmission zero; Couplings; Filtering theory; Insertion loss; Microstrip; Microwave theory and techniques; Passband; Transmission line matrix methods; Extended doublet; lossy circuit technique nonuniform Q distribution; microstrip filter; transmission zeros;

fLanguage

English

Journal_Title

Microwave and Wireless Components Letters, IEEE

Publisher

ieee

ISSN

1531-1309

Type

jour

DOI

10.1109/LMWC.2014.2309089

Filename

6766285