Design of a miniaturized high-isolation dual-frequency antenna based on quarter-mode substrate integrated waveguide
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摘要: 设计实现了一种基于四分之一模基片集成波导（Quarter-Mode Substrate Integrated Waveguide, QMSIW）应用于5.2 GHz/5.8 GHz的双频天线。采用QMSIW结构，在保持了基片集成波导（SIW）的低损耗、低剖面等特性的情况下，减小了天线的体积。通过在QMSIW腔体上添加两排金属化通孔并刻蚀两条矩形槽以及不对称Y形槽，减小其尺寸并实现较高的隔离度。经过测试，天线在5.2 GHz和5.8 GHz的增益分别为6.0和6.1 dBi，交叉极化比分别大于20 dB和25 dB。所设计的天线实现了良好的小型化和大于34 dB的高隔离度，尺寸为0.42λ0×0.42λ0×0.01λ0。实物测试结果与仿真结果吻合良好。
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关键词:
- 四分之一模基片集成波导 /
- 高隔离 /
- 双频 /
- 小型化天线
Abstract: A dual-band antenna based on the quarter-mode substrate integrated waveguide (QMSIW) operating at 5.2GHz and 5.8GHz is designed and implemented. The QMSIW structure reduces the volume of the antenna while maintaining the characteristics of low loss and low profile of the substrate integrated waveguide (SIW). By adding two rows of metallized through holes to the QMSIW and etching two rectangular slots and asymmetric Y-shaped slots, the size is reduced and high isolation is achieved. After testing, the antenna gains at 5.2 GHz and 5.8 GHz are 6.0 and 6.1 dBi, respectively, with cross-polarization ratios greater than 25 dB and 20 dB, respectively. The proposed antenna achieves good miniaturization and high isolation (greater than 34 dB), with dimensions of 0.42λ0×0.42λ0× 0.01λ0. The test results agree well with the simulation results. -
图 5 单一变量对S参数和隔离度的影响
Figure 5. Effect of a single variable on S-parameters and isolation
表 1 天线尺寸参数
Table 1. Parameters of the antenna
(mm) L L1 L2 L3 L4 L5 L6 W 24 10.6 18.5 22.5 10 0.9 0.7 24 W1 W2 W3 W4 G1 G2 K1 K2 2 1.3 0.5 4 0.5 0.5 2.6 2 d p h 1 1.5 0.787 
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表 2 与其他双频天线的比较
Table 2. Comparison with other dual band antennas
antennas frequency/GHz isolation/dB gain/dBi front-to-back ratio FTBR/dB size Ref [5] 5.2/5.8 ＞28 6.97/6.2 − 0.83λ×0.90λ0×0.03λ0 Ref [6] 8.7/10.5 ＞20 5.11/7 ＞11.2 0.81λ0×0.81λ0×0.05λ0 Ref [10] 11.23/11.72 ＞14 5.6/5.9 ＞14 0.54λ0×0.48λ0×0.03λ0 Ref [13] 3.56/4.4 ＞24 5.3/4.45 − 0.43λ0×0.43λ0×0.02λ0 this work 5.2/5.8 ＞34 6.0/6.1 ＞15.6 0.42λ0×0.42λ0×0.01λ0
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