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在波束波导和反射面天线的馈源应用中,为了产生低副瓣且方向图等化的高斯波束,需要将高功率微波转换为准高斯模HE11模辐射.本文利用弯曲圆波导可同时从TM01模产生TE11模和TM11模的原理,提出了采用双弯曲过模圆波导结构直接将TM01转换为HE11的模式变换器,避免了常规微波领域中首先将TM01转换为TE11再用波纹式或半径渐变式TE11-HE11转换器转换为准高斯波束功率容量不足或尺寸过长的不足.基于模式耦合理论和Taguchi优化算法对模式变换器的弯曲半径、相移直端长度及引入位置进行了优化,使输出的TE11和TM11成一定比率,以组成HE11模式,并对设计的模式变换器进行了全电磁波仿真分析,结果表明输出波束的标量高斯含量在9.05—9.8GHz范围内均高于99%,理论功率容量可达4.5GW.
In the feed applications of beam and reflector antennas, high-power microwaves need to be converted to quasi-Gaussian mode HE11 mode radiation in order to generate Gaussian beams with low sidelobe and pattern equalization. In this paper, The principle of mode-generating TE11 mode and TM11 mode is proposed, and the mode converter which uses TM01 to HE11 directly by adopting the double-bending over-mode circular waveguide structure is proposed, which avoids converting TM01 into TE11 and then using corrugated or gradual change of radius in conventional microwave field The TE11-HE11 converter translates into the shortcomings of insufficient or excess power of the quasi-Gaussian beam power.According to the mode coupling theory and the Taguchi optimization algorithm, the bending radius, the length of the phase shift straight-line and the position of the input are optimized The output TE11 and TM11 are in a certain ratio to form the HE11 mode. The full electromagnetic simulation analysis of the designed mode converter shows that the scalar Gaussian content of the output beam is higher than 99% in the range of 9.05-9.8 GHz, and the theory Power capacity up to 4.5GW.