A new microstrip duplexer using open circuited dual-behavior resonator

Author

Srisathit, K. ; Phromloungsri, R. ; Patisang, S. ; Chongcheawchamnan, M.

Author_Institution

Dept. of Telecommun. Eng., Mahanakorn Univ. of Technol., Bangkok, Thailand

Volume

5

fYear

2005

fDate

4-7 Dec. 2005

Abstract

This paper describes a new microstrip duplexer based on open-circuited dual-behavior resonator (OC-DBR). The duplexer offers transmission zeros´ location at the out-of-band response by controlling the impedance ratio of their OC-DBRs, leading to high isolation duplexer design. The proposed duplexer is designed and fabricated on RF60-0600 substrate to suit for the UMTS communication applications with the 1.92-1.98GHz downlink and 2.11-2.17GHz uplink frequencies. Across the bandwidth, the measured insertion losses at the both bands are less than 1.6dB, while the input and output return losses are well below 10dB. More than 30dB isolation performance is obtained from the prototype duplexer.

Keywords

3G mobile communication; microstrip resonators; poles and zeros; 1.92 to 1.98 GHz; 2.11 to 2.17 GHz; RF60-0600 substrate; UMTS communication applications; high isolation duplexer; impedance ratio; insertion loss; microstrip duplexer; open circuited dual-behavior resonator; return loss; transmission zeros location; 3G mobile communication; Bandwidth; Circuits; Communication system control; Downlink; Filtering theory; Frequency; Impedance; Loss measurement; Microstrip resonators; Microstrip duplexer; downlink; dual-behavior resonator; open-circuited resonator; transmission zero; uplink;

fLanguage

English

Publisher

ieee

Conference_Titel

Microwave Conference Proceedings, 2005. APMC 2005. Asia-Pacific Conference Proceedings

Print_ISBN

0-7803-9433-X

Type

conf

DOI

10.1109/APMC.2005.1606935

Filename

1606935