A New Compact Filter-Antenna for Modern Wireless Communication Systems

Author

Wu, Wei-Jun ; Yin, Ying-Zeng ; Zuo, Shao-Li ; Zhang, Zhi-Ya ; Xie, Jiao-Jiao

Author_Institution

Nat. Key Lab. of Antenna & Microwave Technol., Xidian Univ., Xi´´an, China

Volume

10

fYear

2011

fDate

7/3/1905 12:00:00 AM

Firstpage

1131

Lastpage

1134

Abstract

Design, fabrication, and measurement of a new compact filter-antenna for modern wireless communication systems are presented in this letter. Two microstrip square open-loop resonators, a coupled line, and a Γ-shaped antenna are used and integrated to be a filter-antenna. The Γ-shaped antenna is excited by a coupled line that is treated as the admittance inverter in filter design. The Γ-shaped antenna performs not only a radiator, but also the last resonator of the bandpass filter. Therefore, near-zero transition loss is achieved between the filter and the antenna. The design procedure follows the circuit approach-synthesis of bandpass filters. Measured results show that the filter-antenna achieves an impedance bandwidth of 16.3% (over 2.26-2.66 GHz) at a reflection coefficient |S₁₁ | <; - 10 dB and has a gain of 2.41 dBi.

Keywords

UHF antennas; radiocommunication; resonator filters; Γ-shaped antenna; bandpass filter; compact filter-antenna; filter-antenna; impedance bandwidth; modern wireless communication systems; near-zero transition loss; Antennas; Band pass filters; Filtering theory; Microstrip filters; Microwave filters; Q factor; Resonator filters; $Gamma$ -shaped antenna; Filter-antenna; open-loop resonator filter; synthesis;

fLanguage

English

Journal_Title

Antennas and Wireless Propagation Letters, IEEE

Publisher

ieee

ISSN

1536-1225

Type

jour

DOI

10.1109/LAWP.2011.2171469

Filename

6043862