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Annular ring slot antenna with a variable circular polarized mode characteristic  

Kim, Yong-Jin (Department of Electronic Engineering, Kyonggi University)
Kim, Jung-Han (Department of Electronic Engineering, Kyonggi University)
Lee, Hong-Min (Department of Electronic Engineering, Kyonggi University)
Publication Information
Journal of the Institute of Electronics Engineers of Korea TC / v.45, no.1, 2008 , pp. 78-84 More about this Journal
Abstract
In this paper, the reconfigurable annular ring slot antenna with circular polarization diversity is proposed for SDMB(Satellite Digital Multimedia Broadcasting) system. The proposed antenna consists of a ring slot with four tuning stubs. Four PIN diodes are attached to switch circular polarization diversity. By switching the diodes ON or OFF, the proposed antenna can be operated either RHCP mode or LHCP mode. The experimental result shows that the proposed antenna has an impedance bandwidth(VSWR${\leq}$2) of 570MHz(2.47-3.04GHz) at LHCP mode, an impedance bandwidth (VSWR${\leq}$2) of 560MHz(2.45-3.01GHz) at RHCP mode, a maximum gai of 3.1dBi at RHCP mode, 4.76dBi at LHCP mode. The 3dB CP bandwidth of about 100MHz at both RHCP and LHCP mode is achieved at the center frequency 2.63GHz. The proposed antenna is suitable for application such as mobile satellite communications, WLAN(Wireless Local Area Networks), and broadband wireless communication systems.
Keywords
SDMB; Circular polarization diversity; Reconfigurable antenna; PIN diode;
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