Wideband design of coaxially fed U-slot cut patch is a widely reported configuration. It yields a bandwidth of 20–25% on a substrate thickness of 0.06–0.07 λ_g. In all the reported designs, narrower U-slot has been used as it yields required impedance matching to achieve the wideband response. In this paper, initially a detailed study is presented to explain the effects of employing wider U-slot in the rectangular patch to achieve the wider bandwidth. A further modified design of U-slot cut rectangular microstrip antenna is presented, to achieve the impedance matching using a wider U-slot. The modifications in the U-slot cut patch yield optimum possible impedance around the patch TM₁₀ resonant mode that optimizes the loop position inside VSWR = 2 circle, to achieve the maximum bandwidth. Variations using different values of the vertical U-slot lengths have been investigated. In all those variations, impedance bandwidth in the range of 26–30% is achieved in the 950 MHz frequency band, which is 5% higher when compared with narrow U-slot designs. Furthermore, a pair of rectangular slot-cut design of modified U-slot cut antenna is presented, which yields further 5% increment in the bandwidth. Similar designs with circular patch are also proposed which yield more than 5% increase in the bandwidth. In addition to the bandwidth increment, the proposed designs yield nearly 20% reduction in the patch copper area. Proposed antennas yield a broadside radiation pattern with a peak gain of 9 dBi.

同轴馈电 U 形槽切割贴片的宽带设计是一种广泛报道的配置。_{它在 0.06–0.07 λ g}的基板厚度上产生 20–25% 的带宽。在所有报告的设计中，都使用了较窄的 U 形槽，因为它可以产生实现宽带响应所需的阻抗匹配。在本文中，首先进行了详细的研究，以解释在矩形贴片中采用更宽的 U 形槽以实现更宽带宽的效果。提出了对U型槽切割矩形微带天线的进一步改进设计，以利用更宽的U型槽实现阻抗匹配。U 形槽切割贴片的修改可在贴片 TM _{10周围产生最佳可能的阻抗}谐振模式，优化 VSWR = 2 圆内的环路位置，以实现最大带宽。已经研究了使用不同垂直 U 形槽长度值的变化。在所有这些变化中，950 MHz 频段的阻抗带宽范围为 26-30%，与窄 U 形槽设计相比高出 5%。此外，还提出了一对改进的U形槽切天线的矩形槽切设计，其带宽进一步增加了5%。还提出了类似的圆形贴片设计，其带宽增加了 5% 以上。除了带宽增加之外，所提出的设计还使贴片铜面积减少了近 20%。所提出的天线产生峰值增益为 9 dBi 的宽边辐射方向图。