Abstract
A multimode resonance patch antenna with the attractive radiation gain and efficiency is investigated in this paper. A driven patch with both sides shorted similar to the cavity model is presented to generate TM<sub>03</sub> and TM<sub>11</sub> modes. TM<sub>21</sub> mode is also excited by inserting five shorting parasitic patches on both sides of the radiation aperture to extended the impedance bandwidth and no additional feeding structure is required. Meanwhile, a novel single-layer metasurface with the positive gradient of the reflection phase is placed directly above the proposed multimode antenna. Then the characteristics of high gain and better front-to-back ratio (FBR) are acquired. The measured results show that the characteristics of 20.7% impedance bandwidth from 5.08 GHz to 6.25 GHz, stable gain of up to 12.34 dBi, high radiation efficiency of up to 89% and cross-polarization level below -20 dB are obtained. These characteristics all imply that the proposed antenna can be applied to WLAN and Car-to-Car (C2C) communications.
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