Abstract
The authors propose an innovative double-Xi-shaped Chinese character artistic antenna backed by a high-order-mode cavity for 5G millimetre-wave (mm-wave) applications. The initial double-Xi-shaped microstrip antenna element is designed by using characteristic mode theory, and stable gain can be obtained across the whole 5G mm-wave frequency band. By employing a slotted cavity with TE230 high-order-mode to excite 2×2 antenna subarray, a high gain of 13.2 ± 0.8 dBi and a high isolation better than 45 dB without additional feeding networks can be simultaneously achieved. To further improve the gain for reliable transmission, a 4×4 dual linearly polarised (LP) antenna array is also designed and fabricated. Measured results show that a wide frequency bandwidth of 11.45% (24.7–27.7 GHz) with a peak gain of 19.2 dBi and a high isolation of 33 dB is realised for the dual LP antenna array. The proposed method provides a simple and efficient prediction-theory way to design artistic antenna for the first time, which solves the problem of designing specific-shaped antenna without theoretical support.
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