A rectangular patch antenna design with fundamental TM₁₀₀ mode for on‐metal applications is presented. The patch is excited by an inset‐fed microstrip feedline and optimized for better performance by varying the inset‐fed parameters. The patch is then loaded with a circular slot of radius R_y at its center to create additional resonance at TM₁₁ mode. The radius R_y is varied to elongate the circular slot into biconcave shape, to increase its electrical length. Thus, manipulating TM₁₁ mode with respect to TM₁₀₀ mode to achieve wideband by combining the two resonances using overlap technique. Equations of the resonance of the circular slot is stated and so is the surface area of the biconcave. The resulting antenna is etched on a 130 μm‐thick RO3003 microwave laminate and stamped on a metallic pipe cladding using the pipe as the metallic ground. The realized bandwidth is enhanced by 13% with reasonable achieved directivity. The simulated and measured results agreed reasonably with marginal discrepancy.

中文翻译：

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印制凹形缝隙，用于增强金属表面上插入式贴片天线的带宽

提出了一种针对金属应用的具有基本TM ₁₀₀模式的矩形贴片天线设计。该贴片被插入式微带馈线所激发，并通过更改插入式参数进行了优化，以实现更好的性能。然后，该贴片在其中心处加载半径为R _y的圆形槽，以在TM ₁₁模式下产生附加共振。改变半径R _y，以将圆形槽拉长成双凹形状，以增加其电长度。因此，相对于TM ₁₀₀操纵TM ₁₁模式通过使用重叠技术将两个谐振组合在一起来实现宽带模式。陈述了圆形缝隙的共振方程，双凹面的表面积也是如此。最终的天线在厚度为130μm的RO3003微波层压板上进行蚀刻，并使用管道作为金属地面在金属管道覆层上进行冲压。所实现的带宽以合理的方向性提高了13％。模拟和测量结果与边际差异基本吻合。