A vertically folded slotted circular patch operating at the Ka -band is proposed in this communication. Fed by a low-profile microstrip feeding structure, the proposed circular patch resonates at its quasi-TM₂₁ mode and exhibits a wide operational band of 23.5%, which is more superior than many reported millimeter-wave circular patch antennas. A full-corporate fed $2 \times 2$ linearly polarized (LP) subarray based on the proposed circular patch is designed without any additional substrate layer, which is further extended into a $4 \times 4$ LP array and a $4 \times 4$ circularly polarized (CP) sequential rotation array. Both the LP and CP arrays are fabricated and measured. A good agreement between the simulated and measured results has been observed, thus validating the proposed design techniques. With the enhanced performance, for example, wideband, low-profile, low cost, and compact size, the demonstrated array antennas can present promising candidates for some popular Ka -band applications, such as 5G millimeter-wave communications and satellite communications.

中文翻译：

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用于 Ka 波段应用的薄型宽带垂直折叠开槽圆形贴片阵列

一个垂直折叠的开槽圆形贴片在 K a-band 是在本次通信中提出的。由低剖面微带馈电结构馈电，所提出的圆形贴片以其准 TM ₂₁模式谐振，并具有 23.5% 的宽工作频带，比许多报道的毫米波圆形贴片天线更优越。一个全公司的美联储 $2 \times 2$ 基于所提出的圆形贴片的线偏振（LP）子阵列的设计没有任何额外的衬底层，它进一步扩展到一个 $4 \times 4$ LP 阵列和一个 $4 \times 4$ 圆偏振（CP）顺序旋转阵列。LP 和 CP 阵列都是制造和测量的。已经观察到模拟和测量结果之间的良好一致性，从而验证了所提出的设计技术。凭借增强的性能，例如宽带、低剖面、低成本和紧凑的尺寸，所展示的阵列天线可以为一些流行的天线提供有希望的候选者。K a -频段应用，如5G毫米波通信和卫星通信。