HE(11) MITRE BENDS AND GAPS IN A CIRCULAR CORRUGATED WAVE-GUIDE
HE(11) MITRE BENDS AND GAPS IN A CIRCULAR CORRUGATED WAVE-GUIDE
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DOI：
10.1080/00207219408926081
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发表时间：
1994-10-01
影响因子：
1.3
通讯作者：
MOELLER, CP
中科院分区：
文献类型：
--
作者：
DOANE, JL;MOELLER, CP
本文用模匹配技术导出了波纹波导中斜接弯曲或间隙中的HE（11）传输损耗。对于在波长λ处直径D=2a的波导中的间隙长度L，D远大于λ的预测损耗约为1.7 [L λ/（2a（2））]（3/2）dB。测量数据与间隙长度的振荡约此预测值，由于非常高阶的模式的衍射。对于斜接弯曲，L=D。在波纹一直延伸到镜面的斜接弯曲处，由于减少了衍射，上述公式的损失应减少一半。与这些预期相一致的斜接弯曲的测量数据。此外，还介绍了一种110 GHz、1.25英寸波导的斜接弯曲组件的设计，该组件采用HE（11）/HE（12）模混合来减小衍射。在这些组件中的六个串联组件中，对于H平面和E平面取向，每个弯曲测得的HE（11）传输损耗分别为0.46%和0.54%。推断的模式转换损失为0.38%，小于三分之一的一个简单的斜接弯曲。H面弯曲的欧姆损耗为0.08%，这与理论值相当吻合。
The HE(11) transmission loss in a mitre bend or gap in a corrugated waveguide is derived using mode matching techniques. For a gap length L in a waveguide of diameter D=2a at a wavelength lambda, the predicted loss for D much greater than lambda is approximately 1.7 [L lambda/(2a(2))](3/2) dB. Measured data versus gap length oscillate about this predicted value due to the diffraction of very high order modes. For a mitre bend, L=D. The loss in mitre bends where the corrugations are continued up to the mirror should be reduced by half from the above formula due to the reduced diffraction. Measured data on mitre bends that are in agreement with these expectations are presented. In addition, the design of a mitre bend assembly for a 1.25 in waveguide at 110 GHz using an HE(11)/HE(12) mode mixture to reduce the diffraction is described. The measured HE(11) transmission losses in six of these assemblies in series were 0.46% and 0.54% per bend for H-plane and E-plane orientations, respectively. The inferred mode conversion loss of 0.38% is less than one-third that of a simple mitre bend. The inferred ohmic loss of 0.08% for H-plane bends is in reasonable agreement with theory.