Study of microwave mixing methods and their transmission characteristics

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Dr. Berceli Tibor
Department of Broadband Infocommunications and Electromagnetic Theory

The microwave frequency band is extensively used for many applications such as GPS navigation, mobile phone communication, satellite television broadcasting or weather radars.

The microwave mixer is a crucial component of every transmitter and receiver unit. In a transmitter the mixer is used to modulate a carrier signal and in a receiver it downconverts the received signal to an intermediate frequency for which filter and amplifier design is more preferable.

The aim of this B.Sc. thesis is to design a transistor mixer and the required filter circuits, realize them on a microstrip structure, carry out measurements and evaluate the results.

In my thesis, first I review the phenomenon of mixing and summarize the microwave mixing methods. Besides listing the properties of mixers I present the theoretical knowledge needed for design. The design was aided by the AWR Microwave Office software. I explain the steps of the circuit design and then evaluate the results of the measurements performed on the mixer.

I chose a topology which may be used both as an upconverter and a downconverter. I measured the conversion loss, the upper limit of the dynamic range and the isolations between ports. Besides the frequency conversion of carrier signals I also examined the transmission of modulated signals (QPSK, 16-QAM).


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