Center Frequency and Bandwidth Tunable Filter with Varactors

Author

Zhao, Yangping ; Liu, Taijun ; Ye, Yan ; Cen, Like ; Zhang, Haili ; Liu, Xian

Author_Institution

Coll. of Inf. Sci. & Eng., Ningbo Univ., Ningbo, China

fYear

2011

fDate

23-25 Sept. 2011

Firstpage

1

Lastpage

4

Abstract

This paper presented a deformed microstrip combline UHF (Ultra High Frequency) bandpass filter structure with continuous tunability for both center frequency and bandwidth. By using bandwidth control subnetwork, couplings between resonators can be controlled, so as to achieve the tunability of the bandwidth. The electrical length of the deformed filter resonator approximately equals to eg/8, it not only decreases the size of the filter, but also has the second passband centered at somewhat over four times from the first passband. This filter has a 66% tuning range from 400 MHz to 800 MHz, and it can operate in the IMT-Advanced system (450-470 MHz), the Amateur Radio system (430-440 MHz), and part of the Digital Video Broadcasting (DVB-T) system (470-800 MHz).

Keywords

UHF filters; band-pass filters; cognitive radio; microstrip filters; resonator filters; varactors; DVB-T system; IMT-advanced system; amateur radio system; bandwidth control subnetwork; bandwidth tunable filter; center frequency; digital video broadcasting system; filter resonator deformation; frequency 400 MHz to 800 MHz; microstrip combline UHF bandpass filter structure; microstrip combline ultra high frequency bandpass filter structure; varactor; Band pass filters; Bandwidth; Couplings; Microwave filters; Resonant frequency; Resonator filters; Tuning;

fLanguage

English

Publisher

ieee

Conference_Titel

Wireless Communications, Networking and Mobile Computing (WiCOM), 2011 7th International Conference on

Conference_Location

Wuhan

ISSN

2161-9646

Print_ISBN

978-1-4244-6250-6

Type

conf

DOI

10.1109/wicom.2011.6036662

Filename

6036662