This research introduces a novel dual-frequency microstrip patch antenna (MPA) design that features orthogonal slant linear polarizations and a wide frequency ratio (FR) range. A truncated square patch is employed to realize dual-band operation under TM₁₀ and TM₀₁ modes. Both modes are excited along diagonals of the square MPA leading to orthogonal slant polarizations. A shorting pin is loaded underneath the radiator to suppress TM₂₀ mode at the intermediate frequency. Simulated single-feed excitation demonstrates an arbitrary FR between 1.04 and 2.5. In order to confirm the feasibility of the suggested approach, an example of the antenna prototype with an FR of 2 is implemented and tested. Experimental results demonstrate that the antenna successfully achieves dual-band operation with a gain of 4.8 dB and 7.8 dB at 2.7 and 5.4 GHz, respectively, using probe excitation. This approach yields a marginal gain reduction of 0.8 dB at lower frequency when compared to a conventional MPA resonating at the identical frequency. The level of cross-polarization is less than − 20 dB at two frequencies. The proposed antenna stands out for its lightweight and low-profile design, wide FR range, low cross-polarization, stable unidirectional radiation pattern, simple structure and ease of fabrication, making it an ideal choice for dual-band applications.

本研究介绍了一种新型双频微带贴片天线（MPA）设计，具有正交倾斜线性极化和宽频率比（FR）范围。_{采用截角方形贴片来实现TM 10}和TM ₀₁模式下的双频操作。两种模式都沿着方形 MPA 的对角线激发，导致正交倾斜偏振。散热器下方装有一个短路引脚，用于抑制中频的TM _20模式。模拟单馈激励表明 FR 为 1.04 至 2.5 之间的任意值。为了确认所建议方法的可行性，实施并测试了 FR 为 2 的天线原型示例。实验结果表明，使用探针激励，该天线成功实现了双频工作，在 2.7 GHz 和 5.4 GHz 时增益分别为 4.8 dB 和 7.8 dB。与在相同频率下谐振的传统 MPA 相比，这种方法在较低频率下的边际增益降低了 0.8 dB。两个频率下的交叉极化水平小于 − 20 dB。该天线以其轻量化、薄型设计、宽FR范围、低交叉极化、稳定的单向辐射图、结构简单且易于制造而著称，使其成为双频段应用的理想选择。