Design of anti-interference rectangular waveguide slot array antenna based on T-shaped resonators
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摘要: 介绍了一种抗干扰矩形波导缝隙阵列天线的设计方法. 通过在矩形波导下壁引入周期性的T型谐振器，有效提升了天线的抗干扰能力. 仿真、设计并加工了一款基于T型谐振器的四缝隙矩形波导缝隙阵列天线. 测试结果表明，该天线的−10 dB阻抗带宽为10.3%（5.5～6.1 GHz），增益为11.5～12.8 dBi，口径效率为72.1%～87.3%。与传统矩形波导缝隙阵列天线相比较，本文设计天线在抑制频段 7.9～9.6 GHz的抗干扰能力提升了32.2～69.3 dB，适用于多频段、多任务的无线通信、雷达系统等.Abstract: An anti-interference rectangular waveguide slot array antenna is presented in this paper. The antenna’s anti-interference performance is improved by periodically loading a row of T-shaped resonators at the bottom broad wall of the rectangular waveguide. A T-shaped resonator-based four-slot rectangular waveguide slot array antenna is simulated, designed and fabricated. The measured results show that the antenna's impedance bandwidth is 10.3% (5.5-6.1 GHz) with a realized gain of 11.5-12.8 dBi and an aperture efficiency of 72.1%-87.3%. Compared with a traditional rectangular waveguide slot array antenna, the proposed antenna’s anti-interference ability is improved by 32.2-69.3 dB in the suppression band of 7.9-9.6 GHz, so it is suitable for multi-band and multi-task wireless communication and radar systems.
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图 1 基于T型谐振器的矩形波导及其等效电路
Fig. 1 T-shaped resonator-based rectangular waveguide and its equivalent circuit
图 2 基于T型谐振器的矩形波导的色散图
Fig. 2 Dispersion diagram of the T-shaped resonator-based rectangular waveguide
图 3 通、阻带分布随T型谐振器的不同参数变化
Fig. 3 Distributions of passband and stopband vary with different parameters of T-shaped resonator
图 4 基于T型谐振器的矩形波导和传统矩形波导在5.8 GHz和8.5 GHz处的内部电场分布
注：两幅图的上部分为基于T型谐振器的矩形波导，下部分为传统矩形波导
Fig. 4 Inner electric field distributions at 5.8 GHz and 8.5 GHz of the T-shaped resonator-based and traditional rectangular waveguides
图 5 基于T型谐振器的矩形波导与传统矩形波导的传输系数
Fig. 5 Transmission coefficients of the T-shaped resonator-based rectangular waveguide and traditional waveguide
图 6 基于T型谐振器的矩形波导的上表面内壁电流分布
Fig. 6 Inner upper current distribution of the T-shaped resonator-based rectangular waveguide
图 7 抗干扰天线和参考天线结构图
Fig. 7 Configuration of the anti-interference and reference antennas
图 8 抗干扰天线与参考天线仿真的端口反射系数
Fig. 8 Simulated reflection coefficients of the anti-interference and reference antennas
图 9 抗干扰天线与参考天线5.8 GHz处的远场辐射方向图
Fig. 9 Simulated radiation patterns at 5.8 GHz of the anti-interference and reference antennas
图 10 抗干扰天线与参考天线仿真的增益曲线
Fig. 10 Simulated realized gains of the anti-interference and reference antennas
图 12 天线外场测试环境及测试装置
Fig. 12 Antenna open field measuring environment and measuring devices
图 13 抗干扰天线仿真和测试端口反射系数
Fig. 13 Simulated and measured reflection coefficients of the anti-interference antenna
图 14 抗干扰天线仿真和测试H面辐射方向图
Fig. 14 Simulated and measured H-plane radiation patterns of the anti-interference antenna
图 15 抗干扰天线仿真和测试增益曲线
Fig. 15 Simulated and measured realized gains of the anti-interference antenna
表 1 抗干扰天线与参考天线参数取值
Tab. 1 Dimensions of the anti-interference and reference antennas mm
天线 a b lS wS d λg t1 抗干扰天线 28.5 12.6 26.3 2.4 3.0 72.6 1.5 参考天线 37.1 19.0 25.4 3.8 7.0 72.6 1.5 
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表 2 抗干扰波导缝隙阵列天线性能对比
Tab. 2 Comparison with other anti-interference antennas
文献 滤波集
成位置材质 阵元
数目−10 dB阻抗
带宽剖面
高度口径尺寸
(λ02)①抑制频带带宽 抑制水平/dB 效率 [10] 馈电波导 金属 16 9.6% 0.51λ0 / 14.9% ≥30.0 87.5% [12] 馈电波导 金属 256 2.3%、2.2%② 0.95λ0 17.65×17.65 / ≥50.0 60.0% [13] 辐射波导 介质、金属 6 5.6% 0.33λ0 0.67×4.90 8.9% 40.1~62.5 68.9% [14] 辐射波导 金属 4 7.3% 0.28λ0 0.70×3.30 10.8% 41.0~61.5 57.4% [15] 辐射波导 金属 8 4.0% 0.40λ0 0.79×4.59 3.5% 26.6~38.0 83.6% 本文 辐射波导 金属 4 10.3% 0.24λ0 0.55×3.16 19.4% 56.4~80.5 87.3% 注：①λ0是天线中心频率对应的自由空间波长；②双工器的两个工作频带.
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