Design of an L-band Waveguide Filter

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Fehér Gábor
Department of Broadband Infocommunications and Electromagnetic Theory

The goal of my thesis was to design and simulate a microwave filter for the given specification. The difficulties of the design were the extra wide passband and the intense steepness of the attenuation between the passband and stopband. Thus, the simplicity of fabrication was neglected in favor of the strict characteristic. This is why it was clear from the beginning that I have to think about some kind of waveguide structure, which produces the smallest loss due to the absence of any dielectric material. As a result of this, it is capable of carrying high powers and obtaining small attenuation over a wide passband. Placing rods into a waveguide will function as resonators, and allows the propagation of TEM (Transverse Electromagnetic) type electromagnetic waves. Properly coupled resonators will generate a passband, this way a filter can be created with them.

During the first period of my thesis, I review the most necessary fields from the theoretical background of filter design. Later on, I introduce the softwares that I used, then I demonstrate the parts of design and simulation step-by-step. Finally, I present some future development possibilities.


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