In this study, a wideband right‐handed circularly polarized (RHCP) array of microstrip patch antennas, for direct broadcast satellite (DBS, 12.2‐12.7 GHz) services have been presented. The single element of the array is a two‐dimensional mushroom‐shaped fractal antenna of resonating frequency 12.49 GHz and an impedance bandwidth of 1.12 GHz. The proposed single element is designed by etching a pair of Minkowski square boxes in one of the two opposite sides of a regular octagon. Furthermore, a thin slot of length equal to one side of the regular octagon is placed in‐between the two Minkowski boxes, which results in the proposed mushroom‐shaped radiating element. The proposed four‐element linear array resonates at 12.47 GHz and gives an impedance bandwidth of 1.04 GHz. The feed network of the array is designed in such a manner to make the array structure very compact. The fabricated single element gives an RHCP gain of 5.25 dBic and its corresponding circular Polarization (CP) bandwidth of 200 MHz. The array gives an RHCP gain of 11.59 dBic and a CP bandwidth of 460 MHz. The measured CP bandwidth of the fabricated array prototype ensures 92% coverage of the entire DBS band with circularly polarized wave, and hence can be used for its related applications.

中文翻译：

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用于直接广播卫星应用的宽带蘑菇形天线右旋圆极化阵列的设计

在这项研究中，已经提出了用于直接广播卫星（DBS，12.2-12.7 GHz）服务的微带贴片天线的宽带右旋圆极化（RHCP）阵列。阵列的单个元素是谐振频率为12.49 GHz且阻抗带宽为1.12 GHz的二维蘑菇形分形天线。所提议的单个元素是通过在规则八边形的两个相对侧之一中蚀刻一对Minkowski方盒而设计的。此外，在两个Minkowski盒子之间放置了一条长度等于正八边形一侧的细缝，这导致了拟议的蘑菇形辐射元件。拟议的四元素线性阵列在12.47 GHz处产生谐振，并提供1.04 GHz的阻抗带宽。阵列的馈送网络以使得阵列结构非常紧凑的方式设计。制成的单个元件的RHCP增益为5.25 dBic，其相应的圆极化（CP）带宽为200 MHz。该阵列的RHCP增益为11.59 dBic，CP带宽为460 MHz。所制造阵列原型的测量CP带宽可确保圆偏振波覆盖整个DBS频段的92％，因此可用于其相关应用。