What is Polarizer?

Polarizer

A polarizer is a device mounted together with the converter at the focus of the antenna. And transmitting electromagnetic waves of a certain polarization to the converter’s waveguide. According to the principle of operation, polarizers are divided into magnetic and mechanical.

Magnetic Polarizer

The basis of the magnetic polarizer is a coil with a ferrite core, through which electromagnetic waves are transmitted, reflected into the focus of the antenna. A current is applied to the coil, which creates a magnetic field in the core. Under the action of this field, the received waves are rotated through a certain angle. The angle of rotation is regulated by the current strength. Thus, the polarization of the input electromagnetic waves is selected, which enters the rectangular waveguide of the converter.

Mechanical Polarizer

In mechanical polarizers, the plane of the transmitted signal is determined by the position of the polarizer pin. This pin is rotated by a servo motor, to which a sequence of control pulses is applied. Information about the required position of the pin is transmitted by the duration of the pulses. In universal converters, 2 resonant pins are used to isolate polarizations, one of which is excited by a vertically polarized signal, and the other by a horizontally polarized one

Signals of Polarization

The signals of each polarization are amplified inside the converter by its own low-noise amplifier. After that, they enter the switch, controlled by 13/18 V signals, and only one polarization is subjected to further processing (amplification, filtering, and frequency transfer). one of which is excited by a vertically polarized signal, and the other by a horizontally polarized one.

The signals of each polarization are amplified inside the converter by its own low-noise amplifier. After that, they enter the switch, controlled by 13/18 V signals, and only one polarization is subjected to further processing (amplification, filtering, and frequency transfer).