DIELECTRIC FEED FOR REFLECTOR ANTENNAS

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The invention relates to radio engineering and can be used in microwave technology, in particular in the art of satellite television. The technical result of the claimed invention is to improve the effectiveness of the radiation reflector antennas with different opening angle by forming a different directional pattern. Due to the displacement of the dielectric tubes of the radiator is ensured by the simplicity of the design. Manufacturing method of dielectric feed for reflector antennas with circular waveguide is a circular waveguide set cylindrical irradiator, is made of at least two dielectric tubes inserted into each other with the possibility of displacement relative to each other, and the outer diameter of a smaller pick up tube equal to the inner diameter larger. 

 

One of the types of antennas in the reception of radio waves of ultrahigh frequency are mirror antenna consisting of a specular reflector and the receiver unit.

The reflector is usually made of a parabolic shape, and the receiving unit is receiving the pin length of a quarter wavelength, which is installed in the waveguide.

Reflected from the mirror signal is fed into a waveguide and then to the receiving pin and cable. The disadvantage of this method is that the cutoff waveguide has a radiation pattern wider than the geometric size of the antenna, and a significant part of the energy does not come in the waveguide.

To correct this, at the end of the waveguide must be an irradiator that forms a directivity pattern that is optimal for a specific antenna.

And here below a practical example

 

 

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And here is a simulation of a LNB without dielectric feed...

 

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