A dual-band bandpass filter using parallel doubly coupled structure with loading capacitance

Author

Han, Na ; Dong, Yu-Liang ; Wang, Mao-Yan

Author_Institution

Sch. of Phys. Electron., Univ. of Electron. Sci. & Technol. of China, Chengdu, China

fYear

2010

fDate

8-11 May 2010

Firstpage

1849

Lastpage

1851

Abstract

A dual-band bandpass filter using parallel doubly coupled structure with loading capacitance is designed for dual-band applications at 17/35 GHz. New coupling structure is proposed to replace the normal counterparts. It can provide two passband respectively in Ku-band and Ka-band. By using the capacity-load structure, the slow-wave effect occurs in this filter, which can reduce the circuit size and cause the bandstop effect to suppress the harmonic wave. Besides, two open-circuited stubs are used to produce transmission zeros in the stopbands, which can get sharp out-of-band attenuation. The isolation between these two passbands is better than 20 dB from 20 to 33 GHz. This filter is analyzed and designed by CST and HFSS software, and the simulated results of which show good agreement with the theoretical analysis.

Keywords

band-pass filters; coupled circuits; Ka-band; Ku-band; bandstop effect; capacity-load structure; circuit size; coupling structure; dual-band bandpass filter; harmonic wave; loading capacitance; open-circuited stubs; parallel doubly coupled structure; slow-wave effect; Band pass filters; Capacitance; Couplings; Dual band; Filtering theory; Frequency; Millimeter wave technology; Passband; Power harmonic filters; Resonator filters; Dual-band filter; coupled transmission lines; loading capacitance; microstrip filter; open-circuited stubs;

fLanguage

English

Publisher

ieee

Conference_Titel

Microwave and Millimeter Wave Technology (ICMMT), 2010 International Conference on

Conference_Location

Chengdu

Print_ISBN

978-1-4244-5705-2

Type

conf

DOI

10.1109/ICMMT.2010.5524872

Filename

5524872