A wideband low profile H‐shaped microstrip patch antenna (MPA) with reallocated quadruple‐mode resonance is presented for indoor wireless communication application. In this paper, the TM₂₀ (mode 1), TM₀₂ (mode 2), TM₂₂ (mode 3), and additionally notch mode 4 of the proposed MPA are simultaneously employed. First, the rectangular radiating patch is reshaped as an H‐shaped radiator so as to separate a pair of degenerate modes (mode 1 and mode 2). Then, a pair of linear notches is cut on the diagonal of the patch to excite an additional notch resonance (mode 4). Finally, in order to improve the frequency of mode 1, four shorting pins are placed at the four corners of the H‐shaped patch. Therefore, the bandwidth of the antenna is dramatically increased up by utilizing four resonant modes (modes 1, 2, 3, and 4). A prototype of H‐shaped patch antenna with notches and shorting pins is manufactured and measured. The results show that the antenna achieves a broad bandwidth of about 31.7% (2.31‐3.18 GHz), and its profile is only 0.036 wavelength of center frequency. It is particularly noticed that a relative high gain of around 9.8 dBi is successfully acquired, while keeping relative stable dual‐beam radiation patterns.

中文翻译：

---

四模谐振下低剖面H形微带贴片天线的带宽和增益改进

针对室内无线通信应用，提出了具有重新分配的四模式谐振的宽带低剖面H型微带贴片天线（MPA）。在本文中，TM ₂₀（模式1），TM ₀₂（模式2），TM ₂₂（模式3），并同时采用建议的MPA的陷波模式4。首先，将矩形辐射贴片重塑为H形辐射体，以分离一对退化模式（模式1和模式2）。然后，在贴片的对角线上切出一对线性槽口，以激发额外的槽口共振（模式4）。最后，为了提高模式1的频率，在H型贴片的四个角上放置了四个短路针。因此，通过利用四个谐振模式（模式1、2、3和4），天线的带宽显着增加。制作并测量了带有缺口和短路针的H形贴片天线的原型。结果表明，该天线可实现约31.7％（2.31-3.18 GHz）的宽带宽，并且其分布图仅为中心频率的0.036波长。