Title :
Properties of oversized corrugated waveguides at moderate diameter-wavelength ratio
Author :
Lukovnikov, D.A. ; Bogdashov, A.A. ; Denisov, G.G.
Author_Institution :
Inst. of Appl. Phys., Acad. of Sci., Nizhny Novgorod, Russia
Abstract :
The corrugated oversized waveguides are especially attractive for application in antenna feeds because the lowest hybrid eigenmode HE11 in corrugated waveguide produces a radiation pattern with very low sidelobes and cross-poIarization. Besides, under a certain set of parameters (the electrical depth of corrugation about a quarter of wavelength and period less than half-wavelength) this wave in rather wide operating band has much lower attenuation than for any other linearly polarized wave in smooth waveguide. This very interesting effect of ohmic losses decreasing for certain waves in oversized waveguides is mainly considered for travelling HE11 wave which has the simplest structure and has frequency far above the cutoff
Keywords :
antenna feeds; antenna radiation patterns; circular waveguides; eigenvalues and eigenfunctions; electromagnetic wave polarisation; losses; antenna feeds; cross-polarization; electrical depth; hybrid eigenmode; linearly polarized wave; moderate diameter-wavelength ratio; ohmic losses; oversized corrugated waveguides; radiation pattern; sidelobes; Antenna feeds; Antennas and propagation; Attenuation; Electric breakdown; Frequency; Geometry; Microwave filters; Millimeter wave propagation; Physics; Resonator filters;
Conference_Titel :
Physics and Engineering of Millimeter and Submillimeter Waves, 1998. MSMW '98. Third International Kharkov Symposium
Conference_Location :
Kharkov
Print_ISBN :
0-7803-5553-9
DOI :
10.1109/MSMW.1998.755526
