利用互补天线原理求解孔缝的共振性能
Resonant performance of microwave-slot coupling derived using complementary antenna theory
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摘要: 利用互补天线原理从理论上推导了真空、介质窄缝的共振频率公式,在理想窄缝长度小于5倍波长、辐射角度偏离垂直方向小于30°的情况下,孔缝的共振频率点仍然可以用半波振子的辐射情况来解释,共振点满足孔缝长度等于入射波的半个波长;介质窄缝等效为半个孔缝深度的微带贴片天线,不同介电常数介质填充时的共振频率理论公式推导值和数值模拟值基本一致,相对误差在5%以内。进一步分析了窄缝阵列的耦合性能,结果表明互补天线原理可以很好地应用于分析和求解孔缝的共振性能。Abstract: With the complementary antenna theory, this paper deduced the resonant frequencies of narrow slots. When the length of a vacuum slot is less than 5 times of the incident wavelength and the deviation angle of radiation relative to the perpendicular direction is less than 30°, the radiation of the slot can be explained by that of the dipole antenna, and resonances occurrs when the slot length equals to half wavelength. The dielectric slot can be equivalent to a microstrip and printed antenna with a depth half that of the slot. The theory expression matches the simulation results well with relative deviation below 5%. A further analysis of the coupling performance of the microwave-slot array indicates that the complementary antenna theory applies well in the study of microwave-slot coupling.
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Key words:
- control theory /
- complementary antenna /
- resonant effect /
- resonant frequency /
- microwave-slot coupling
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