A low-profile aperture-coupled microstrip patch antenna (MPA) under multiresonant modes for wide half-power beamwidth (HPBW), high gain and enhanced-bandwidth is proposed. Firstly, the radiation patterns of the MPA are studied to improve the radiation performance. It demonstrates that the HPBW of the lower TM ₁₀ mode could be progressively widened by properly selecting the dielectric constant of the substrate. Meanwhile, by etching a rectangular slot, the high sidelobe in E-plane of the upper TM ₃₀ mode could be obviously reduced, resulting in enhancing the normal gain. Secondly, the improved feeding network is introduced and studied. The results show that the impedance bandwidth of the antenna is successfully extended over dual operating bands. Finally, the proposed antenna is fabricated and tested. Experimental results show that the antenna has improved-bandwidths (| S ₁₁ | < –10 dB) with two-minimum poles in the range of 1.42–1.45 GHz for the lower band and 3.95–4.13 GHz for the upper band, respectively, which is about two times wider than that of the traditional counterpart. Besides, the antenna maintains the small thickness of about 0.02 free-space wavelength. Particularly, the wide E-plane HPBW and broadside gain of the MPA are simultaneously enhanced to around 130° and 9.0 dBi at the lower and upper bands, respectively.

中文翻译：

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使用多谐振模式同时具有宽波束宽度和高增益的薄型双频贴片天线

提出了一种在半谐振波束宽度（HPBW），高增益和增强带宽的多谐振模式下的薄型孔径耦合微带贴片天线（MPA）。首先，研究了MPA的辐射方向图，以提高辐射性能。It demonstrates that the HPBW of the lower TM ₁₀ mode could be progressively widened by properly selecting the dielectric constant of the substrate. 同时，通过蚀刻矩形槽，上部TM _30的E平面中的高旁瓣 模式可能会明显降低，从而提高正常增益。其次，对改进的饲养网络进行了介绍和研究。结果表明，天线的阻抗带宽已成功扩展到双工作频段。最后，所提出的天线被制造和测试。实验结果表明，该天线具有改进的带宽（| 小号 ₁₁ | <–10 dB），两个最小极点分别在较低频段为1.42–1.45 GHz和在较高频段为3.95–4.13 GHz，比传统频段宽约两倍。此外，天线保持约0.02个自由空间波长的较小厚度。特别地，在较低和较高频段，E平面的宽HPBW和MPA的宽边增益分别同时提高到130°和9.0 dBi。