A reconfigurable design for bandwidth enhancement of circularly polarized slot antennas

✍ Scribed by Tsung-Hsun Hsieh; Jeen-Sheen Row

• Publisher: John Wiley and Sons
• Year: 2010
• Tongue: English
• Weight: 613 KB
• Volume: 52
• Category: Article
• ISSN: 0895-2477
• DOI: 10.1002/mop.25192

✦ Synopsis

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. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 1377–1380, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.25192