National Changhua University of Education Institutional Repository : Item 987654321/10989

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NCUEIR > College of Engineering > Department and Graduate Institute of Electronic Engineering > Periodical Articles > Item 987654321/10989

Please use this identifier to cite or link to this item: http://ir.ncue.edu.tw/ir/handle/987654321/10989

Title:	A reconfigurable design for bandwidth enhancement of circularly polarized slot antennas
Authors:	Hsieh, Tsung-Hsun;Row, Jeen-Sheen
Contributors:	電機工程學系
Keywords:	Slot antenna;Circular polarization;Reconfigurable antenna
Date:	2010-06
Issue Date:	2012-06-05T02:01:17Z
Publisher:	Wiley
Abstract:	A reconfigurable design is proposed to improve the circular polarization (CP) operating bandwidth of an annular-ring slot antenna fed with an L-shaped coupling strip. The design involves four voltage-controlled varactor diodes, which are placed below the slot and symmetrically distributed along the circumference of the slot. When all antenna dimensions remain constant, the CP operating frequency of the slot antenna can be decreased by varying dc voltage values. In addition, theses CP operating frequencies, which are corresponding to different dc voltage values can form a successive frequency band, and the available CP bandwidth is thus improved. Experimental results indicate that with the reconfigurable design, the 3-dB axial-ratio CP bandwidth can be increased by a factor of 4 for the annular-ring slot antenna with a reflector.
Relation:	Microwave and Optical Technology Letters, 52(6): 1377-1380
Appears in Collections:	[Department and Graduate Institute of Electronic Engineering] Periodical Articles

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