讨论一种基于单极狭缝天线结构的平面宽带单向性天线,末端凸起结构的反馈线和2个不对称的狭缝产生了寄生电容,改善了天线的阻抗匹配特性.在贴片右边加入两个金属结构,调整地板面的宽度,在地板面嵌入2个不对称的狭缝作为反射器,可以显著改善天线的前后比.使用电磁场仿真软件HFSS对天线进行仿真调试,天线的前后比达到26.10 dB.%A wideband planar unidirectional antenna based on the monopole slot monopole was presented. Owing to the additional capacitance contributed by a stub protruded feedline and two asymmetrical stubs at the slot edge, the impedance-matching condition was improved. By adding two metallic fingers at right corners, modifying the width of the ground plane, and etching two asymmetrical slits in the ground plane as reflectors, the front-to-back ratio of the proposed antenna significantly improved. This antenna had been simulated and optimized with the electromagnetic simulation software HFSS, and the front-to-back ratio could achieve 26. 10 dB.
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