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In this paper, we extend the modal formulation to characterize the transmission characteristics of a circular pipe with two open ends. Our interest in this problem stems from the possibility of using an open pipe as a transmission medium to propagate waves through an opaque wall at radar frequencies. We begin this study by developing an approximate solution for the transmitted field through a circular...
The transmission characteristics of 0.3 THz wave through a circular waveguide whose diameter charged from 90 mm to 5 mm by two taper waveguides was investigated. As a power source, FUCW-I gyrotron ( GYCOM, Russia) was used. The gyrotron is operated in CW regime at weak power (20~ 100 W) Gaussian mode with the frequency of 0.3THz. The usual beam current is 130 mA at the accellated voltage 15 KV. The...
The transmission characteristics of a TE01-mode waveguide sharp bend, of 1m equivalent radius, are presented. The attenuation is less than 0.25 dB across the frequency band 30?110 GHz.
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