大尺寸模式转换天线的设计和实验研究
Design and experiment research on an oversize mode-transducing antenna
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摘要: 在同轴波导尺寸较大的情况下，传统的插入四块金属板的同轴插板式模式转换器难以满足扇形波导内单模传输的条件。通过增加插板数目，设计了大尺寸情况下的模式转换器，并将其与同轴喇叭有机结合，设计了一个中心频率为7 GHz的新型模式转换天线，可以实现高功率微波源输出TEM模的定向辐射。该模式转换天线的数值计算结果为：增益22.2 dB，口径效率53.7%，中心频率上反射系数为0.07，在6.5~7.5 GHz频率范围内反射系数小于0.3。实验测量结果为：增益21.5 dB，口径效率约46%，在6.5~7.5 GHz频率范围内反射系数约为0.07~0.39。数值计算与实验测量结果基本一致。Abstract: Under the circumstance of oversize coaxial waveguide, the traditional coaxial mode converter with four metal plates inserted does not satisfy the unique-mode requirement. In this paper, an oversize mode converter is designed with eight metal plates inserted. Moreover, it combines with a coaxial horn to form a mode-transducing antenna, which can directly radiate coaxial TEM mode from high-power microwave sources. The center frequency is 7 GHz. The calculated results of the antenna are as follows: the antenna gain is 22.2 dB with an aperture efficiency of 53.7%, the reflection coefficient is 0.07 at the center frequency and less than 0.3 in the range of 6.5~7.5 GHz. The measured results are as follows: the antenna gain is 21.5 dB with an aperture efficiency of about 46%, the reflection coeff
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Key words:
- high-power microwave /
- mode converter /
- mode-transducing antenna
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