A compact diplexer using square open loop with stepped impedance resonators

Author

Konpang, Jessada

Author_Institution

Rajamangala Univ. of Technol. Krungthep, Bangkok

fYear

2008

fDate

16-20 Dec. 2008

Firstpage

1

Lastpage

4

Abstract

A compact diplexer using square open loop with stepped impedance resonators is proposed here. The resonator consists of two identical patches with attached to inner corner of the square open loop. The bandpass filter and diplexer are used an alternative technique for the implementation of transmission zeros using an asymmetric feed structures. A prototype diplexer is designed at 1950 MHz and 2140 MHz. The diplexer channels are 3.07% and 2.8% fractional bandwidth. The measured insertion losses are about 3.0 dB for the two channels with better than 45 dB isolation. It is very useful for the mobile communication systems.

Keywords

3G mobile communication; band-pass filters; multiplexing equipment; poles and zeros; resonators; asymmetric feed structures; bandpass filter; compact diplexer; diplexer channels; fractional bandwidth; frequency 1950 MHz; frequency 2140 MHz; square open loop; stepped impedance resonators; transmission zeros; Attenuation; Band pass filters; Dielectric substrates; Feeds; Impedance; Magnetic separation; Microstrip filters; Passband; Resonant frequency; Resonator filters;

fLanguage

English

Publisher

ieee

Conference_Titel

Microwave Conference, 2008. APMC 2008. Asia-Pacific

Conference_Location

Macau

Print_ISBN

978-1-4244-2641-6

Electronic_ISBN

978-1-4244-2642-3

Type

conf

DOI

10.1109/APMC.2008.4958209

Filename

4958209