High Selective Microstrip Bandpass Filter and Diplexer With Mixed Electromagnetic Coupling

Author

Jian-Kang Xiao ; Min Zhu ; Yong Li ; Li Tian ; Jian-Guo Ma

Author_Institution

Sch. of Electro-Mech. Eng., Xidian Univ., Xi´an, China

Volume

25

Issue

12

fYear

2015

Firstpage

781

Lastpage

783

Abstract

A high selective bandpass filter and a high isolation diplexer by using mixed electromagnetic coupling have been presented. The filter transmission zeros (TZs) are attributed to the mixed electromagnetic coupling, and additional resonators are not required. TZs also can be adjusted by controlling the electric and magnetic couplings. The diplexer is fabricated and measured, and the new design is demonstrated by measurement. The diplexer has a compact size of 0.483λ_g×0.585λ_g, and a measured high isolation of no less than 42 dB.

Keywords

band-pass filters; electromagnetic coupling; microstrip couplers; microstrip filters; microstrip resonators; resonator filters; filter transmission zeros; isolation diplexer; microstrip bandpass diplexer; microstrip bandpass filter; mixed electromagnetic coupling; Band-pass filters; Electromagnetic coupling; Filtering theory; Microwave filters; Resonant frequency; Bandpass filter (BPF); diplexer; isolation; mixed electromagnetic coupling; transmission zero (TZ);

fLanguage

English

Journal_Title

Microwave and Wireless Components Letters, IEEE

Publisher

ieee

ISSN

1531-1309

Type

jour

DOI

10.1109/LMWC.2015.2495194

Filename

7323886