A Comparison of the Attenuation of High-Order Mode in Coaxial Waveguide due to Inner and Outer Conductor Losses

Jiao, Chongqing; Zheng, Nan; Luo, Jirun

doi:10.1007/s10762-010-9642-z

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Analytic Formula Of Propagation Constant1

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“…So, the attenuation constant will be close to infinite and not feasible for frequencies close to and below cutoff. The second is the so called boundary impedance perturbation model [19][20][21][22][23]. This model can be used into the frequency range close to and below cutoff and the effect of wall loss on the phase constant can also be considered.…”

Section: Analytic Formula Of Propagation Constantmentioning

confidence: 99%

Selective Suppression of Electromagnetic Modes in a Rectangular Waveguide by Using Distributed Wall Losses

Jiao

2011

PIER Letters

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Abstract-An over-mode metal rectangular waveguide is widely used in the generation, propagation, coupling, and transition of microwaves. When applied as the beam-wave interaction circuit of some high power microwave devices, a rectangular waveguide is expected to operate at a single electromagnetic mode. To do that, unwanted modes resulted from spurious oscillations should be suppressed. In this paper, a method of selective suppression of electromagnetic modes in rectangular waveguides by loading distributed losses in some special position of waveguide inner wall is presented. By using the method, the unwanted modes can be attenuated much larger relative to the operating mode. The presented method can be used to improve the stability of rectangular waveguide beam-wave interaction circuit.

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