Title :
Radiation method for the measurement of mode-conversion levels
Author :
Clarricoats, P.J.B. ; Olver, A.D. ; Parini, C.
Author_Institution :
Queen Mary College, University of London, Department of Electrical & Electronic Engineering, London, UK
Abstract :
A novel method for the determination of mode-conversion levels in overmoded waveguides is described. It relies on a swept-frequency measurement of the perturbation of the dominant-mode radiation pattern of the open-ended waveguide, owing to the presence of higher-order modes. Results are reported for mode-conversion effects in corrugated waveguides at frequencies near 9 GHz. Excellent agreement with the trapped-resonance method is demonstrated, although the present technique has advantages over this method when the mode excitation level is high or the waveguide length is imprecisely known.
Keywords :
microwave measurement; waveguides; H-plane radiation pattern; corrugated waveguides; coupling coefficient; dominant mode radiation pattern; mode conversion level measurement; open ended waveguides; overmoded waveguides; perturbation; radiation method; swept frequency measurement;
Journal_Title :
Electronics Letters
DOI :
10.1049/el:19740417
