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Gain‐enhanced electronically tunable microstrip patch antenna
Author(s) -
Vinoy K. J.,
Jose K. A.,
Varadan V. K.,
Varadan V. V.
Publication year - 1999
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/(sici)1098-2760(19991220)23:6<368::aid-mop15>3.0.co;2-m
Subject(s) - microstrip antenna , patch antenna , materials science , antenna (radio) , antenna gain , radiation pattern , dielectric , optoelectronics , antenna measurement , coaxial antenna , antenna efficiency , microwave , high gain antenna , microstrip , antenna factor , optics , electrical engineering , telecommunications , engineering , physics
This paper presents an electronically tunable microstrip patch antenna with improved radiation characteristics. The directive gain of the antenna is improved by as much as 5.5 dB, by the addition of a high dielectric superstrate, with a thin air gap interspersed between the dielectric layers. Three different high‐dielectric sheets have been tested, and it is observed that the gain improvement is the maximum for the highest dielectric. The air gap is experimentally adjusted to optimize for the best gain of the antenna, without degrading its input characteristics. The total addition to the thickness is only 3.2 mm for an antenna operating at about 850 MHz. The resonant frequency of the antenna shifts toward low with the addition of the superstrate layers. ©1999 John Wiley & Sons, Inc. Microwave Opt Technol Lett 23: 368–370, 1999.