A new technology for expanding the axial ratio (AR) bandwidth of the circularly polarized (CP) dielectric patch (DP) antenna while maintaining the low‐profile characteristic is proposed for the first time. By making full use of the multimode characteristic of the DP resonator, two pairs of degenerate modes (ie, TM₁₀₁ and TM₀₁₁, TM₁₂₁ and TM₂₁₁) are selected for the broadband design. The key to the proposed technology is that according to the EM field distribution of the two pairs of degenerate modes, four air holes are introduced in the DP and their position and size are elaborately designed to discriminately control the frequency of the two pairs of degenerate modes. Then, these modes become close and are merged to effectively expanding the AR bandwidth of the low‐profile CP DP antenna. For demonstration, a prototype centered at about 10 GHz is designed, fabricated, and measured. The measured results exhibit that the proposed CP DP antenna with a low profile of 0.07λ₀ owns a 3 dB AR bandwidth of 9.7% and a peak gain of 7.66 dBic. Good agreement is observed between simulated and measured results.

中文翻译：

---

具有带宽扩展的薄型圆极化电介质贴片天线

首次提出了一种在保持低剖面特性的同时扩展圆极化（CP）电介质贴片（DP）天线的轴比（AR）带宽的新技术。通过充分利用DP谐振器的多模特性，可以使用两对简并模（即TM ₁₀₁和TM ₀₁₁，TM ₁₂₁和TM ₂₁₁）用于宽带设计。提出的技术的关键在于，根据两对简并模式的电磁场分布，在DP中引入了四个气孔，并精心设计了它们的位置和大小，以区别地控制两对简并模式的频率。 。然后，这些模式变得紧密并合并在一起，以有效地扩展薄型CP DP天线的AR带宽。为了演示，设计，制造和测量了以10 GHz为中心的原型。测量的结果显示出，与0.07的低轮廓所提出的CP DP天线λ ₀拥有的9.7％的3dB带宽AR和7.66 DBIC的峰值增益。在模拟和测量结果之间观察到良好的一致性。