UHF-band feed for parabolic reflector

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Szűcs László
Department of Broadband Infocommunications and Electromagnetic Theory

The aim of this thesis is to design, build and measure an antenna system consisting a prime-focus feed and a parabolic dish which would be capable of space communication. During data transfer a phenomena called free space path loss or attenuation occurs, because of the distance between Earth and the satellite. To overcome this loss an antenna with high gain and directivity is required. The parabolic antenna used for satellite TV broadcast and the Yagi-Uda antenna meet these conditions, but because of the Masat-1, the university already has one Yagi so the chosen type is the parabolic.

The parabolic dish is given, so the thesis only contains the three major parts needed for the feed:

• the radiator element(s) used to illuminate the dish

• the balun used to connect the feed with the transmission line

• also a power divider is required because of the chosen primer feed

The applied frequency range is the so called „70-cm band” ISM band used by radio amateurs and the Masat-1.

The illumination of the dish is carried out with dual polarization, which is done with two antenna feeds, the first one with horizontal and the second one with vertical polarization. Hence an estimation to the rotating frequency and a two dimensional projection of the cube can be given of a rotating transmitter from the difference of the received signal strengths.


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