Design of microwave branching systems

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Supervisor:
Dr. Gyimóthy Szabolcs
Department of Broadband Infocommunications and Electromagnetic Theory

Abstract

Today’s high-speed point-to-point communication links place extreme demands on microwave developers. While high reliability and high capacity are essential, realizing this in practice requires more detailed knowledge of passive components, and more accurate models for simulations.

In this diploma work, the development of a microwave matching structure is presented, that is planned to be used in between an antenna, and a coupler, having circular and rectangular cross-section waveguide connections, respectively. The geometry of the matching structure is given, and a finite element model is built up. Numerical stability of the calculated electromagnetic parameters is studied.

After describing the model of the matching structure, its components are optimized independently, and the complete structure is set up, taking into consideration the interaction between the parts. Estimation of the electromagnetic performance of a real device is given using tolerance analysis on the optimized arrangement.

Simulation results are verified by measurements taken on an existing prototype. Besides the measuring the performanc of the components of the matching structure only, the behaviour of the whole coupler system (coupler body and matching components together) is investigated for type approval.

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