Recent experimental investigation on FSS arrays forming waveguides (FSGs) and
horns showed that incident electromagnetic energy can be guided and radiated at
specific frequencies. This thesis aims to provide the theoretical understanding of the
waves propagating inside a cylindrical FSS waveguide. With immediate applications
on horn antennas the research deals with cylindrical guides, made entirely from
double periodic arrays. The theoretical analysis begins as a standard electromagnetic
boundary value problem. The formulated system of algebraic equations is solved
either for the complex propagation constant, by an iterative procedure or, for the
fields. The analysis makes use of the Floquet modal expansion, the current
representation as a set of sub-domain basis functions and the Method of Moments.
Initially, the thesis is concerned with single periodic structures, which is a special
case to the analysis. The efficiency of the model to provide stable and valid results is
examined. Next the elements are finite dipoles. The effects of the dipole resonance
to the propagating and radiating characteristics of the FSS is closely investigated.
Other aspects include the effects of the periodicity and the element size. The
investigation concludes with an FSG with square loop elements. Validation of the
results for some designs is made by comparison with measured data.
A Doctoral Thesis. Submitted in partial fulfilment of the requirements for the award of Doctor of Philosophy at Loughborough University.