Broadband high efficiency circularly polarized active integrated antenna

Author

Qin, Y. ; Gao, S. ; Elsdon, M. ; Sambell, A.

Author_Institution

Sch. of Eng. & Technol., Northumbria Univ., Newcastle-upon-Tyne, UK

Volume

3

fYear

2005

fDate

4-7 Dec. 2005

Abstract

This paper presents a broadband high efficiency circularly polarized active antenna integrated with class-E power amplifier (PA) at 2GHz. A single circular microstrip patch fed by a cross slot is employed as not only a broadband circularly polarized radiator but also as a harmonics-termination load network, which is directly connected with the class-E power amplifier output. A low cost PCB technology is employed in the circuit fabrication and a low voltage PHEMT transistor is used. A peak drain efficiency of 71.1% for the class-E amplifier is measured at 2.05GHz, together with a maximum radiated power of 28.2 dBm from the active integrated antenna (AIA). Power added efficiency (PAE) over 50% within a 17% bandwidth from 1.92GHz to 2.28GHz is achieved. Axial ratio below 3 dB is obtained over a 9% bandwidth from 1.99 GHz to 2.18 GHz.

Keywords

UHF power amplifiers; active antennas; broadband antennas; microstrip antennas; polarisation; power HEMT; slot antennas; 1.92 to 2.28 GHz; 2.0 GHz; 2.05 GHz; PCB technology; broadband active integrated antenna; broadband radiator; circular microstrip patch; circular polarization; class-E power amplifier; cross slot fed microstrip patch; harmonics-termination load network; low voltage PHEMT transistor; Bandwidth; Broadband amplifiers; Broadband antennas; Costs; Fabrication; High power amplifiers; Integrated circuit technology; Microstrip; Polarization; Power amplifiers;

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.2005.1606698

Filename

1606698