The work presented in this thesis examines mode conversion characteristics of corrugated horns. The outcome of this investigation is the ability to produce optimum designs for corrugated horns. Analysis of propagation characteristics of corrugated conical horns is extended to the throat region where the complex representation of eigenvalues must be used to obtain an accurate field representation. A modal matching technique to the several is described using spherical modes and applied investigation of the scattering properties of types of discontinuities which may occur in corrugated horns. Computer modelling of a corrugated horn is described using the modal matching technique. The corrugated horn is divided up into a number of conical horn sections, each section propagating spherical modes. The propagating characteristics of each section are computed and modal matching is used to predict the scattering matrix for each junction between sections. The scattering matrices are then cascaded so that the complete horn can be modelled on the computer and an optimised design performed. Radiation properties of corrugated horns are studied by taking the influence of mode conversion in the horn into account. Comprehensive theoretical investigation into return loss performance, mode conversion characteristics and radiation properties of corrugated horns are described and substantiated by the experimental results . A phase cancellation method is presented, which can be used to design a profiled corrugated horn with low return loss and low higher order modes presented at the aperture.
| Identifer | oai:union.ndltd.org:bl.uk/oai:ethos.bl.uk:631247 |
| Date | January 1987 |
| Creators | Xiang, Jun |
| Publisher | Queen Mary, University of London |
| Source Sets | Ethos UK |
| Detected Language | English |
| Type | Electronic Thesis or Dissertation |
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