This paper proposes a low-profile, low-cost, and wideband quad-layer element for designing transmitarray antenna (TA). Changing the dimensions of the element shifts its passband. Sometimes, this shift is so large that the passband of the element exits the desired operating band of the TA. In other words, areas of the passband with low transmission magnitudes match the desired operating band. In this case, elements with low transmission magnitudes have no beneficial effect on the total gain of the array, and the gain drops, thus shrinking the bandwidth. The bandwidth of the proposed element is so wide that passbands corresponding to different dimensions of the elements overlap in a large area around the central frequency. To display the effect of this feature, a 14×14-element TA is designed and manufactured using the proposed element. The measurement results indicate a 1-dB bandwidth of 18.4% and 54% aperture efficiency.

本文提出了一种用于设计发射阵列天线 (TA) 的薄型、低成本和宽带四层元件。改变元素的尺寸会改变它的通带。有时，这种偏移非常大，以至于元件的通带超出了 TA 的所需工作频带。换句话说，具有低传输幅度的通带区域与所需的工作频带相匹配。在这种情况下，低传输幅度的元件对阵列的总增益没有任何有益影响，增益下降，从而缩小带宽。所提出的元件的带宽非常宽，以至于对应于元件不同尺寸的通带在中心频率周围的大区域内重叠。为了显示此功能的效果，使用建议的元件设计和制造了 14×14 元件的 TA。