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Step Width Tolerable For Offset Of The Aperture In A Millimeter-wave Transducer Between Post-wall And Hollow Standard Waveguides

机译:壁厚和空心标准波导之间的毫米波换能器中的孔径偏移可容许的步距

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摘要

A transducer with a wide step from a post-wall waveguide to a hollow waveguide width is proposed which is tolerant against the aperture offset. The modes in the step width of about 1.50 wavelengths are stable for the aperture offset and the fields are not so perturbed while in the conventional stepped structure with step width of about 1.00 wavelength, the higher evanescent mode of TE_(30) is excessively enhanced by the aperture offset. The operation of the transducer with the wider step is robust for the fabrication errors in the millimeter wave band. It is also suggested that the anti-symmetrical TE_(20) mode which is excited only by non-zero offset or the misalignment of the aperture exists in both structures and can not be the dominant factor for the improvement. The transducers are designed and fabricated at 61.25 GHz using PTFE substrate with glass fiber of ε_r=2.17. The bandwidth for the reflection lower than -15 dB is almost unchanged (6.30-6.60 GHz) for the offset from -0.2 mm to 0.2 mm, while it is degraded in the conventional stepped structure, from 7.65 GHz for no offset to 3.30-5.70 GHz for the same range of the offset.
机译:提出了一种具有从壁后波导到中空波导宽度的宽步长的传感器,该传感器可以抵抗孔径偏移。对于孔径偏移,约1.50个波长的步长宽度模式是稳定的,并且场不会受到干扰,而在步长为约1.00个波长的常规阶梯结构中,TE_(30)的较高渐逝模式会被过度增强。孔径偏移。对于毫米波段中的制造误差,换能器具有更宽的台阶的操作是可靠的。还建议在两种结构中都存在仅由非零偏移或孔径不对准激发的反对称TE_(20)模式,并且不能成为改善的主要因素。该换能器使用ε_r= 2.17的玻璃纤维的PTFE基板在61.25 GHz下设计和制造。从-0.2 mm到0.2 mm的偏移量,低于-15 dB的反射带宽几乎不变(6.30-6.60 GHz),而在常规的阶梯结构中,带宽从7.65 GHz的无偏移量降低到3.30-5.70。相同偏移范围的GHz。

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