Design and measurement of diode mixers at 10GHz

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Mészáros Gergely Zoltán
Department of Broadband Infocommunications and Electromagnetic Theory

The importance of mixers is unquestionable. They are basic elements of spectrum- and vector network analyzers, and they can also be found in telecommunications and in circuits which are used in broadcasting.

This paper is the continuation of my Project Laboratory work, in which I compared several mixers based on the circuit parameters. In that case we only investigated the large signal properties. Our goal was to find mixers with the highest possible OIP3 and the lowest possible conversion loss. These mixers are to be realized in microwaves.

The diploma consists of five parts.

In the first chapter I give a summary about mixers, their parameters and the Schottky-diode.

In the second chapter I write about the solution of my task. I review the chosen microwave substrate, the selection of the mixers and their realization in microwaves, the design of the layouts and the manufactured circuits.

The third chapter is about diode modelling. I review the measurements needed to perform in order to identify the diode model and the result of the optimization.

In the fourth chapter I write about the mixer measurements, the measurement results and I compare them with the analysis.

In the fifth chapter I summarize my work and introduce some possible further developments.


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