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A reconfigurable design for bandwidth enhancement of circularly polarized slot antennas
Author(s) -
Hsieh TsungHsun,
Row JeenSheen
Publication year - 2010
Publication title -
microwave and optical technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 76
eISSN - 1098-2760
pISSN - 0895-2477
DOI - 10.1002/mop.25192
Subject(s) - varicap , slot antenna , reconfigurable antenna , bandwidth (computing) , circular polarization , electrical engineering , microwave , engineering , reflector (photography) , voltage , optics , physics , optoelectronics , microstrip antenna , antenna (radio) , coaxial antenna , microstrip , telecommunications , capacitance , light source , electrode , quantum mechanics
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