H - Electricity – 01 – Q
Patent
H - Electricity
01
Q
333/20
H01Q 13/02 (2006.01) H01P 5/08 (2006.01)
Patent
CA 1229890
ABSTRACT TRANSITION BETWEEN A CONTINUOUS AND A CORRUGATED CIRCULAR WAVEGUIDES FOR EFFICIENT LAUNCH OF SIGNALS IN TWO FREQUENCY BANDS. The invention relates to a transition for propagating signals between a continuous and a corrugated circular waveguides with minimized and low spurious mode excitations in two bands of frequency. The transition a- chieves transformation of the TEll mode, the dominant signal carrier mode of a continous waveguide, into the HEll hybrid mode, the corresponding mode carrying signals in the corru- gated structures, by employing a tapered waveguide transi- tion of circular cross-section having dual-depth circumfer- encial corrugations in the interior boundary surface. The transition utilizes mutual resonance property of dual-depth corrugations at the port which connects to continuous wave- guide to achieve a satisfactory return loss in two bands. At the port which is connected to the corrugated horn, whereas the quarter wavelength self-resonance of the individual slots in the dual depth corrugation configuration provides the de- sired HEll hybrid mode under balanced hybrid condition in two bands. A gradual transition of the electrical character- istics is achieved along the length of the transition through an adjustment of the corrugation parameters. Excitation of higher order spurious modes can be maintained at a low level when properly chosen cross-sectional dimensions are consid- ered along the length of the transition.
470612
Ghosh Subir
Junior Aluizio Prata
Gowling Lafleur Henderson Llp
Telecomunicacoes Brasileiras S/a-Telebras
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