Cascaded fourth-order mixed-coupled bandpass filter with good frequency selectivity

Author

Shuanglin Yuan ; Xubo Wei ; Guotao Yue ; Mingxia Zhang

Author_Institution

Res. Inst. of Electron. Sci. & Technol., Univ. of Electron. Sci. & Technol. of China, Chengdu, China

fYear

2013

fDate

24-25 Oct. 2013

Firstpage

229

Lastpage

232

Abstract

A compact fourth-order bandpass filter with good frequency selectivity is presented. The proposed BPF consists of four cascaded stepped impedance resonators (SIRs). Mixed electric/magnetic (E/M) coupling are introduced in the proposed filter to generate transmission zeros (TZs) near the passband for sharp frequency selectivity. The method on the generation of transmission zeros caused by mixed coupling introduced in the filter is analyzed. A new filter with 15.4% fractional bandwidth (FBW) has been designed and fabricated to verify the validity of the proposed method. Three TZs are introduced near the passband, which is at 1.21GHz, 1.72GHz, 3.03GHz. Measured results are in good agreement with the electromagnetic simulation.

Keywords

band-pass filters; electromagnetic coupling; microwave filters; resonator filters; FBW; SIR; TZ; cascaded mixed-coupled bandpass filter; compact fourth-order bandpass filter; electric-magnetic coupling; electromagnetic simulation; fractional bandwidth; frequency 1.21 GHz; frequency 1.72 GHz; frequency 3.03 GHz; frequency selectivity; mixed coupling; stepped impedance resonators; transmission zeros; Band-pass filters; Couplings; Filtering theory; Magnetic separation; Microwave filters; Passband; Resonator filters; bandpass filter; fourth order; mixed E/M coupling; transmission zeros;

fLanguage

English

Publisher

ieee

Conference_Titel

Microwave and Millimeter Wave Circuits and System Technology (MMWCST), 2013 International Workshop on

Conference_Location

Chengdu

Type

conf

DOI

10.1109/MMWCST.2013.6814615

Filename

6814615