Abstract
In this paper, patch antenna structures are studied to simultaneously excite the ground radiation mode and patch radiation mode. Based on the analysis of characteristic current distribution on the ground plane of patch antenna, an exciting method of the ground radiation mode is proposed. Then a dual-mode patch antenna of patch radiation and ground radiation is designed, which can achieve a wideband radiation using two modes resonating at two adjacent frequencies. To improve the radiation efficiency of the ground mode, the electric field distribution of the dual-mode antenna is investigated in detail and the electric field models for two modes are constructed. It is suggested that the additional notches introduced on the ground plane can enhance the resonance component of the ground mode. By this way, the modified patch antenna presents better radiation efficiency over the operating band. The measurement results show that the relative bandwidth of the patch antenna prototype with the notches is about 16.2%, defined by the reflection coefficient less than -10 dB. The proposed dual-mode antennas have the inherent characteristics of weak directivity, for that the antenna application scenarios also are indicated.
Highlights
Traditional self-resonant antenna elements are larger in size, which are not suitable to be built within mobile terminals for multi-band or lower-frequency operations
Because the radiation waves are excited by the grounding chassis current, they are referred as the ground radiation mode antennas [4] and the corresponding chassis as the ground radiation element
This means there are fundamental characteristic currents of the ground mode, which distribute on the lower ground plate part just under the patch element and make antenna present the feature of ground mode radiation over lower frequency band
Summary
WEIWEN LI 1, (Member, IEEE), QIUHAO LI 1, JIANHUA ZHOU LONGFANG YE 2, AND YANHUI LIU 2, (Senior Member, IEEE).
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