Broadband High Efficiency Circularly Polarized Active Integrated Antenna

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

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review


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). A 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.

Original languageEnglish
Title of host publicationAsia-Pacific Microwave Conference Proceedings 2005
Subtitle of host publicationAPMC 2005
PublisherInstitute of Electrical and Electronics Engineers Inc.
Number of pages4
ISBN (Print)078039433X, 9780780394339
Publication statusPublished - 20 Mar 2006
Externally publishedYes
EventAsia-Pacific Microwave Conference 2005 - Suzhou, China
Duration: 4 Dec 20057 Dec 2005

Publication series

NameAsia-Pacific Microwave Conference Proceedings, APMC
ISSN (Print)2165-4727
ISSN (Electronic)2165-4743


ConferenceAsia-Pacific Microwave Conference 2005
Abbreviated titleAPMC 2005

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