The modelling of ferrite-loaded helical devices

2918 14 15997 6 27057 document 15997 Qureshi11PhD.pdf application/pdf 9afa8a49a261b1747c09eb83e3e2c855 MD5 1560307 2011-11-11 14:14:24 http://etheses.bham.ac.uk//id/eprint/2918/1/Qureshi11PhD.pdf 2918 1 1 application/pdf application/pdf en public

Qureshi11PhD.pdf

http://eprints.org/relation/hasVolatileVersion http://etheses.bham.ac.uk/id/document/16001 http://eprints.org/relation/hasVersion http://etheses.bham.ac.uk/id/document/16001 http://eprints.org/relation/hassmallThumbnailVersion http://etheses.bham.ac.uk/id/document/16001 http://eprints.org/relation/hasVolatileVersion http://etheses.bham.ac.uk/id/document/16002 http://eprints.org/relation/hasVersion http://etheses.bham.ac.uk/id/document/16002 http://eprints.org/relation/haspreviewThumbnailVersion http://etheses.bham.ac.uk/id/document/16002 http://eprints.org/relation/hasVolatileVersion http://etheses.bham.ac.uk/id/document/16003 http://eprints.org/relation/hasVersion http://etheses.bham.ac.uk/id/document/16003 http://eprints.org/relation/hasIndexCodesVersion http://etheses.bham.ac.uk/id/document/16003 15998 4 27060 document 15998 Decl_IS_Qureshi11PhD.pdf application/pdf 7b9c15159b1120ec73887311380a2e72 MD5 202691 2011-11-11 14:14:29 http://etheses.bham.ac.uk//id/eprint/2918/2/Decl_IS_Qureshi11PhD.pdf 2918 2 2 application/pdf application/pdf en staffonly

Decl_IS_Qureshi11PhD.pdf

http://eprints.org/relation/hasVolatileVersion http://etheses.bham.ac.uk/id/document/15999 http://eprints.org/relation/hasVersion http://etheses.bham.ac.uk/id/document/15999 http://eprints.org/relation/hassmallThumbnailVersion http://etheses.bham.ac.uk/id/document/15999 http://eprints.org/relation/hasVolatileVersion http://etheses.bham.ac.uk/id/document/16000 http://eprints.org/relation/hasVersion http://etheses.bham.ac.uk/id/document/16000 http://eprints.org/relation/haspreviewThumbnailVersion http://etheses.bham.ac.uk/id/document/16000 15999 2 27067 document 15999 small.png image/png f90e98cedce73e5d7436947ea647b3d0 MD5 10163 2011-11-11 14:18:58 http://etheses.bham.ac.uk//id/eprint/2918/3/small.png 2918 3 3 image/png thumbnail_small Thumbnail Documents conversion from application/pdf to thumbnail_small en staffonly

small.png

http://eprints.org/relation/isVersionOf http://etheses.bham.ac.uk/id/document/15998 http://eprints.org/relation/isVolatileVersionOf http://etheses.bham.ac.uk/id/document/15998 http://eprints.org/relation/issmallThumbnailVersionOf http://etheses.bham.ac.uk/id/document/15998 16000 2 27068 document 16000 preview.jpg image/jpeg b84a8b74d9dbf850c35b72eab6035517 MD5 42412 2011-11-11 14:18:58 http://etheses.bham.ac.uk//id/eprint/2918/4/preview.jpg 2918 4 4 image/jpeg image/jpeg Thumbnail Documents conversion from application/pdf to thumbnail_preview en staffonly

preview.jpg

http://eprints.org/relation/isVersionOf http://etheses.bham.ac.uk/id/document/15998 http://eprints.org/relation/isVolatileVersionOf http://etheses.bham.ac.uk/id/document/15998 http://eprints.org/relation/ispreviewThumbnailVersionOf http://etheses.bham.ac.uk/id/document/15998 16001 2 27069 document 16001 small.png image/png c39f4e0a68b23da48e2c6aad4cec546c MD5 2652 2011-11-11 14:18:59 http://etheses.bham.ac.uk//id/eprint/2918/5/small.png 2918 5 5 image/png thumbnail_small Thumbnail Documents conversion from application/pdf to thumbnail_small en staffonly

small.png

preview.jpg

indexcodes.txt

http://eprints.org/relation/isVersionOf http://etheses.bham.ac.uk/id/document/15997 http://eprints.org/relation/isVolatileVersionOf http://etheses.bham.ac.uk/id/document/15997 http://eprints.org/relation/isIndexCodesVersionOf http://etheses.bham.ac.uk/id/document/15997 archive 4031 disk0/00/00/29/18 2011-11-11 14:18:52 2019-01-23 09:55:07 2011-11-11 14:18:52 thesis show 0 Qureshi Omar Osman Smith P. Stephen S. Leppinen D. University of Birmingham The modelling of ferrite-loaded helical devices unpub TK 10col_ephy Helical devices are employed in the area of microwave technology. Applications such as filters and travelling-wave tubes are some of these in which helical devices are used. Ferrite loaded helical devices have been of interest to scientists and engineers throughout the last half century. The structure that is considered in this thesis is of a helix surrounded by a ferrite tube, both of which are enclosed in a cylindrical waveguide. Maxwell's equations for electromagnetism are employed in order to derive the expressions for the electric and magnetic fields. The parameters of the structure are varied in order to observe how certain factors will affect the dispersiveness, loss and phase shift of the structure. The investigation considers the effect of varying the applied magnetic field. The investigation also incorporates an air gap between the ferrite and helix and between the ferrite and metal waveguide. For the first time, the affects of these air gaps are analysed. 2011-12 2011-01 graduation eng author unchecked This unpublished thesis/dissertation is copyright of the author and/or third parties. The intellectual property rights of the author or third parties in respect of this work are as defined by The Copyright Designs and Patents Act 1988 or as modified by any successor legislation. Any use made of information contained in this thesis/dissertation must be in accordance with that legislation and must be properly acknowledged. Further distribution or reproduction in any format is prohibited without the permission of the copyright holder. public 239 University of Birmingham School of Engineering, Department of Electronic, Electrical and Systems Engineering d_ph FALSE epsrc 2011-12 graduation