In this paper, a stacked microstrip patch antenna with polarization reconfigurable property has been proposed for worldwide interoperability for microwave access (WiMAX) application. The proposed antenna has two substrate layers: upper and lower layers with two radiating patches connected with the coaxial probe. Without the upper layer the lower square-shaped substrate layer having regular hexagonal radiating patch with probe fed acts as a linear polarized antenna with impedance bandwidth for (S11 ≤ −10 dB) is 370 MHz 10.56% (3.32–3.69 GHz) cover WiMAX (3.4–3.69 GHz) application band. The hexagonal radiating patch is perturbed with an optimum rectangular slot to enhance the impedance bandwidth of the antenna. The lower substrate layer having hexagonal patch with the same probe position is stacked with the upper square-shaped substrate layer with same sized square patch and the upper patch soldered with the coaxial probe. The overall stacked antenna generates a circularly polarized band when the opposite corner of the top square radiating patch of the upper layer is truncated with optimum size. In order to generate another circularly polarized band and to improve the input impedance matching of the stacked antenna, the top radiating patch is perturbed with two slots and a slit. The stacked circularly polarized antenna generates impedance bandwidth of 12.75% (3.23–3.67 GHz) for (S11 ≤ −10 dB) with two circularly polarized bands (3.34–3.37 GHz) and (3.66–3.70 GHz) as per (axial ratio ≤ 3 dB) for WiMAX application. Therefore, the proposed antenna can be used as linearly polarized or dual band circularly polarized according to requirement.

中文翻译：

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一种用于 WiMAX 应用的紧凑型极化可重构堆叠微带天线

在本文中，提出了一种具有极化可重构特性的堆叠微带贴片天线，用于全球微波接入互操作性 (WiMAX) 应用。所提出的天线有两个衬底层：上层和下层，两个辐射贴片与同轴探头相连。在没有上层的情况下，具有正六边形辐射贴片的下方形衬底层与探针馈电充当线性极化天线，其阻抗带宽为（小号11≤ −10 dB) 是 370 MHz 10.56% (3.32–3.69 GHz) 覆盖 WiMAX (3.4–3.69 GHz) 应用频段。六边形辐射贴片采用最佳矩形槽扰动，以提高天线的阻抗带宽。具有相同探针位置的六边形贴片的下基板层与具有相同尺寸的方形贴片的上方形基板层和与同轴探针焊接的上贴片堆叠。当上层顶部方形辐射贴片的对角被截断为最佳尺寸时，整个堆叠天线会产生一个圆极化带。为了产生另一个圆极化频带并改善堆叠天线的输入阻抗匹配，顶部辐射贴片被两个槽和一个狭缝扰动。小号11≤ -10 dB），具有两个圆极化频段（3.34–3.37 GHz）和（3.66–3.70 GHz），根据（轴比≤ 3 dB）用于 WiMAX 应用。因此，所提出的天线可以根据需要用作线极化或双频圆极化。