An exciter system for an antenna

POLARIZATION ROTATIONER

A waveguide structure that has two rotating parts changes the polarization of a radio frequency signal in two steps or one step. The waveguide structure includes input and output waveguides and a polarization rotator. The output waveguide includes two cavities corresponding to two polarizations. The rotator includes cut-away portions of a rectangular shape which are rotated with respect to each other and the first wave guide by predetermined angles. When the second waveguide is rotated from one cavity to another, the rotator is also rotated, thereby changing the polarization of the signals passing through the waveguide. In addition, if the rotator and the second waveguide are interlocked, then the number of steps required to accomplish the polarization change can be reduced to one, because rotation of the second waveguide will cause the rotation of the polarization rotator.

Polarization rotationer

A waveguide structure that has two rotating parts changes the polarization of a radio frequency signal in two steps or one step. The waveguide structure includes input and output waveguides and a polarization rotator. The output waveguide includes two cavities corresponding to two polarizations. The rotator includes cut-away portions of a rectangular shape which are rotated with respect to each other and the first wave guide by predetermined angles. When the second waveguide is rotated from one cavity to another, the rotator is also rotated, thereby changing the polarization of the signals passing through the waveguide. In addition, if the rotator and the second waveguide are interlocked, then the number of steps required to accomplish the polarization change can be reduced to one, because rotation of the second waveguide will cause the rotation of the polarization rotator.

Excitation system for an antenna with a parabolic reflector and a dielectric radiator

An excitation system which can be used with sector antennas which do not have circular reflectors is described. The reflector is designed as a rectangular strip which curves parabolically in the direction of its long axis to form a sector antenna. The end face of the radiator has four partial faces which form equal pairs and their opposing faces are arranged with respect to the central axis of the hollow conductor so that the surfaces of the two pairs extend at approximately right angles to each other. The partial faces of the radiator extending in the direction of the long axis of the reflector are large in relation to the two partial faces extending crosswise thereto.

Excitation system for an antenna with a parabolic reflector and a dielectric radiator

An excitation system is indicated for an antenna with a parabolic reflector (1) and a dielectric radiator (3) which is attached to the end of a hollow conductor used to guide electromagnetic waves, and is located in the center of the reflector (1) and has a metallized end face designed as a subreflector. The reflector (1) is designed as a rectangular strip forming a sector antenna which has a parabolic curve in the direction of its long axis (A). The end face of the radiator (3) has four partial faces (8, 9, 10, 11) which form pairs and are arranged with respect to the central axis of the hollow waveguide (2) so that each pair of partial faces extends approximately at a right angle to the other pair of partial faces, the partial faces of each pair being of equal size. The two partial faces (8, 9) extending in the direction of the long axis of reflector (1) are large in relation to the two partial faces (10, 11) extending crosswise thereto.

Magnetization system for an antenna with a parabolic reflector and a dielectric transmitter

Exciter system for an antenna with a curved parabola reflector and a dielectric radiator

Polarisationsdreher

A polarization rotator

A waveguide structure that has two rotating parts changes the polarization of a radio frequency signal in two steps or one step. The waveguide structure includes input (10) and output waveguides (12) and a polarization rotator (14). The output waveguide includes two cavities corresponding to two polarizations. The rotator includes cut-away portions (24,26) of a rectangular shape which are rotated with respect to each other and the first wave guide by predetermined angles. When the second waveguide is rotated from one cavity to another, the rotator is also rotated, thereby changing the polarization of the signals passing through the waveguide. In addition, if the rotator and the second waveguide are interlocked, then the number of steps required to accomplish the polarization change can be reduced to one, because rotation of the second waveguide will cause the rotation of the polarization rotator. <IMAGE>