In this article, we have presented a novel design of wideband slot antennas using theory of characteristic modes and theory of mode coupling. First, the narrow slot antenna, etched in a finite ground, is investigated with combined characteristic modes. While most of resonant slot antennas show narrowband operation, the modification of modal properties using structural manipulations is studied in detail and this analysis helps in the design of low-profile wideband slot antennas. Characteristic mode analysis explains the physical insight of resonance and radiation mechanism of proposed wideband slot antennas. Bandwidth enhancement techniques of these slot antennas are presented and validated with measured results of wideband slot antennas. This approach gives a large fractional bandwidth of >35% and high gain of >3 dB.

在本文中，我们使用特征模式理论和模式耦合理论提出了一种宽带缝隙天线的新颖设计。首先，用组合特征模式研究蚀刻在有限地面上的窄缝天线。虽然大多数谐振缝隙天线都显示出窄带操作，但详细研究了使用结构操作对模态特性的修改，这种分析有助于设计低剖面宽带缝隙天线。特征模式分析解释了所提出的宽带缝隙天线的共振和辐射机制的物理洞察力。介绍了这些缝隙天线的带宽增强技术，并通过宽带缝隙天线的测量结果进行了验证。这种方法提供了 >35% 的大部分带宽和 >3 dB 的高增益。