Substrate Integrated Waveguide (SIW) is an important technology that
helps to get benefit of metal rectangular waveguides and Micostrip,
allowing for microwave circuits with high-performance, high-integrity
and low-cost. Using this technology, mic
rowave circuits with high
performance, small size and high integrity could be designed.
This research is based on experimental results of magnetization and magnetic susceptibility of ferrite slab prepared in a previous work with a computerized simulation to find the influence of ferrite slab on a microwave propagation in terms of determ
ining the behavior of attenuation factor .A slab of ferrite Co0.6Zn0.4Fe2O4were prepared by classical ceramic method. We have studied an influence of slab of the CoZn-ferrite its thickness is , loaded in a rectangular waveguide on a propagation of microwaves. The values of the reverse and forward attenuation factor has been found. After that, we choose the location of the slab X0 inside the guide which means the optimum status of microwave propagation has been reached at .
This thesis investigates a new transmission lines technologie called "Substrat Integrated Waveguide (SIW). SIW takes advantages of rectangular waveguides and microstrip transmission lines, to be used in the construction of low loss microwave circuits
.
At the beginning of this work, some well known technologies of transmission lines (like microstrip line, rectangular waveguide .... etc.) were studied, to recognize the advantages and disadvantages of each technology, and the applications that could be built by them. Then the structure of the substrate integrated waveguide technology was presented, and the possible propagation modes were studied. In addition, the aproximate equations used in its design were given. After that, a comparison between SIW and rectangular waveguide was done. Interconnections between SIW and other transmission lines (like microstrip line, rectangular waveguide .... etc.) were also studied, to define the structure that gives the lowest possible insertion loss and the widest passband. Finally, we reviewed the important role played by filters in the fields of cellular communications, radar, electronic warfare and satellite systems.
