@inproceedings{6d4307be08c448edb03e1fd87fe4231b,
title = "Broadband High Efficiency Circularly Polarized Active Integrated Antenna",
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). 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.",
keywords = "Broadband antennas, polarization, broadband amplifiers, power amplifiers, bandwidth, high power amplifiers, microstrip, costs, integrated circuit technology, fabrication",
author = "Y. Qin and S. Gao and M. Elsdon and A. Sambell",
year = "2006",
month = mar,
day = "20",
doi = "10.1109/APMC.2005.1606698",
language = "English",
isbn = "078039433X",
volume = "3",
series = "Asia-Pacific Microwave Conference Proceedings, APMC",
publisher = "Institute of Electrical and Electronics Engineers Inc.",
booktitle = "Asia-Pacific Microwave Conference Proceedings 2005",
address = "United States",
note = "Asia-Pacific Microwave Conference 2005, APMC 2005 ; Conference date: 04-12-2005 Through 07-12-2005",
}