C-Band Low Noise Amplifier Design

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Dr. Rieger István
Department of Broadband Infocommunications and Electromagnetic Theory

Within the confines of my thesis I designed a low noise amplifier, which is capable of receiving satellite signals in the 3.4 – 4.2 GHz frequency range.

A low noise amplifier is a key component of satellite radio receiver, connected directly to the receiver antenna. Besides amplifying the weak signal, barely exceeding noise level, particular attention must be given to minimize the noise generated by the amplifier, since the useful signal may be lost.

The specification of the LNA has been determined by the claims of Bonn Hungary Electronics Ltd. The finished device must include a microwave filter that suppresses the satellite uplink band and a manually controlled analog attenuator, which can reduce the gain in 30 dB dynamic range.

The studies and collection of microwave substrates and components followed the specification of the task. The matching of the amplifier and the microwave filter was simulated by Microwave Office. The design of high-frequency and DC printed circuit boards followed the simulation, finally the tuning and measurement of the instrument was made.


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