A Fourth-Order Lumped-Element Bandpass Filter Constructed on Multilayer Substrates

Author

Ke Cao ; Qi-wei Li ; Chong-hu Cheng

Author_Institution

Sch. of Electron. Sci. & Eng., Nanjing Univ. of Posts & Telecommun., Nanjing, China

Volume

24

Issue

11

fYear

2014

fDate

Nov. 2014

Firstpage

745

Lastpage

747

Abstract

A fourth-order bandpass filter scheme and its implementation with multilayer substrates are proposed in this letter. The filter is composed of two second-order filters and an impedance matching network between them, which provides one additional controllable transmission zero. By using two different feedback capacitors, two additional transmission zeros are introduced. The physical layout is fully interpreted and an experimental prototype is fabricated and measured. Good agreement between measured results and simulated results is observed. The results show the high out-of-band suppression.

Keywords

band-pass filters; impedance matching; multilayers; substrates; controllable transmission zero; feedback capacitors; fourth-order lumped-element bandpass filter scheme; high out-of-band suppression; impedance matching network; multilayer substrates; physical layout; second-order filters; Band-pass filters; Capacitors; Filtering theory; Impedance matching; Integrated circuit layout; Substrates; Bandpass filter (BPF); multilayer substrates; transmission zeros;

fLanguage

English

Journal_Title

Microwave and Wireless Components Letters, IEEE

Publisher

ieee

ISSN

1531-1309

Type

jour

DOI

10.1109/LMWC.2014.2348497

Filename

6879503