Miniaturized Antenna with High Radiation Efficiency Using Ground and Chip Capacitors

Hyengcheul CHOI
Kyung-Young JUNG
Hyeongdong KIM

IEICE TRANSACTIONS on Communications   Vol.E95-B    No.10    pp.3328-3331
Publication Date: 2012/10/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.E95.B.3328
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Antennas and Propagation
antenna,  size reduction,  ISM band,  and mobile handset,  

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Ground antennas are suitable for use in mobile electronic devices due to their compactness. These ground antennas incorporate two capacitors for controlling the resonance frequency and a shorting loop for impedance matching. In this work, we compare the performance of a ground antenna with that of a meandered inverted-F antenna (IFA). It is numerically and experimentally shown that a ground antenna can yield simultaneous improvements in both the antenna size and radiation efficiency when compared to the meandered IFA. The bandwidth of the ground antenna for a voltage standing wave ratio (VSWR) of 3:1 is 240 MHz from 2350 MHz to 2590 MHz, while the minimum total antenna efficiency is 62% within the 2.4 GHz ISM band.