Broadband high-efficiency circularly polarized active antenna and array for RF front-end application

Qin, Yi, Gao, Steven and Sambell, Alistair (2006) Broadband high-efficiency circularly polarized active antenna and array for RF front-end application. IEEE Transactions on Microwave Theory and Techniques, 54 (7). pp. 2910-2916. ISSN 0018-9480

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This paper presents a broadband high-efficiency circularly polarized (CP) active integrated antenna, and a broadband CP active array at 2 GHz. To realize the broadband CP antenna, a circular patch is aperture coupled by crossed slots in the ground plane, which are fed by an L-shaped microstrip feed line below the ground. The antenna is designed to serve the functions of both a radiator and a harmonics-terminated load for class-E high-efficiency power-amplifier (PA) integration. The broadband CP active antenna is realized by directly integrating the broadband CP antenna with the class-E PA. It achieves a 9% bandwidth (1.84-2.01 GHz) for axial ratio (AR) below 3 dB, and a 12% bandwidth for power-added efficiency (PAE) over 60%. To form the broadband CP active array, four active antenna elements are sequentially rotated, and each element is directly integrated with broadband class-E PA. A low-cost printed-circuit-board technology is employed in fabrication and a pseudomorphic high electron-mobility transistor is used. A peak drain efficiency of 71.5% for the class-E amplifier is measured at 1.95 GHz. The active array achieves a peak-effective radiated power of 39.7 dBm, and PAE is over 50% within a 22.6% bandwidth (1.72-2.16 GHz). The AR is below 3 dB over a 27% bandwidth (1.72-2.26 GHz).

Item Type: Article
Additional Information: Published in the best journal in Microwave Theory and Techniques. Research results will be useful for mobile handset and mobile base station applications where low cost, small size, high efficiency, low power consumption/long battery life and circular polarization are needed. Collaborative project with external partners including Birmingham University. This project is supported by industries (Agilent Technologies). Research results directly relevant to wireless communications industries. One outcome of a PhD project (Y. Qin) funded by EPSRC EPSRC Grant GR/S42538/01.
Subjects: H600 Electronic and Electrical Engineering
Department: Faculties > Engineering and Environment > Mathematics, Physics and Electrical Engineering
Depositing User: EPrint Services
Date Deposited: 27 Nov 2008 12:47
Last Modified: 10 Aug 2015 11:34

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