Design of broadband dual-band dual circularly polarized millimeter wave antenna for 5G mobile devices
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摘要: 设计实现了一种宽带双频双圆极化的毫米波单馈天线，天线同时在n257（26.5～29.5 GHz）、n260（37.0～40.0 GHz）波段工作。与传统的圆极化天线相比，天线采用上下堆叠的不规则贴片实现了双频双圆极化，提高了信号收发隔离度；通过增加弯曲的寄生贴片，天线拓展了圆极化轴比带宽；金属边框上的矩形缝隙用来改善天线增益和带宽。测试结果表明，天线低频和高频的相对阻抗（<−10 dB）带宽分别达到20.4%和17.0%，相对轴比（<3 dB）带宽分别达到14.9%和11.4%。天线带宽覆盖n257、n260波段，可以用于5G移动设备与低轨卫星的通信。Abstract: A broadband dual-band dual circularly polarized millimeter wave single-fed antenna is designed. The antenna operates in n257(26.5−29.5 GHz) and n260(37.0−40.0 GHz) bands simultaneously. Compared with the traditional circularly polarized antenna, irregular patches stacked up and down are used to realize dual-band dual-circular polarization and improve the isolation of signal reception and transmission. By adding a curved parasitic patch, the antenna extends the axial ratio bandwidth. Rectangular gaps in the metal-frame are used to improve the antenna gain and expand the antenna bandwidth. The measurement results show that the relative impedance (<−10 dB) bandwidth at low frequency and high frequency are 20.4% and 17.0% respectively, and the relative axial ratio (<3 dB) bandwidth of dual-band dual-circular polarization are 14.9% and 11.4% respectively. The antenna bandwidth covers n257 and n260 bands, which can be used for communication between 5G mobile devices and LEO satellites.
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图 2 天线演变对轴比带宽的影响
Figure 2. Effect of antenna evolution on axial ratio bandwidth (AR BW)
图 4 28 GHz处上层贴片电场分布图
Figure 4. Electric field distribution of the upper patch at 28 GHz
图 5 38 GHz处下层贴片电场分布图
Figure 5. Electric field distribution of the lower patch at 38 GHz
表 1 天线单元尺寸参数
Table 1. Dimension parameters of antenna
(mm) H1 H2 H3 W0 Ly W1 W2 L1 0.813 1.3 0.508 1 9 2.1 1.7 1.7 Lx C3 C4 Lk1 Wf L2 Lf1 Lf2 9.6 0.9 2.3 4.6 0.5 1.1 5.6 2.6 C1 r1 r2 Lyout1 L0 Linx Liny Liny1 1.2 0.2 0.4 4.8 5.9 7.8 8.6 8.6 
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表 2 不同双圆极化天线结果比较
Table 2. Comparison of the proposed antenna with the other dual-circular-polarized antennas
antennas year operating frequency/GHz relative impedance BW/% relative 3 dB AR BW/% relative size/λ0 feed mode Ref [7] 2018 2.55/6.0 14.7/28.4 8.8/4.4 0.22×0.22 single feed Ref [8] 2019 2.4/5.2 20.4/12.6 16.6/5.7 0.30×0.32 single feed Ref [9] 2022 5.15/6.32 27.5 2.7/4.4 − single feed Ref [10] 2022 18.9/28.5 − 26.4/24.6 0.69×0.69 reflecting surface this work − 28/38 20.4 /17.0 14.9/11.4 0.89×0.84 single feed
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