The helical antenna is a type of antenna that can transmit and receive polarized electromagnetic signals rotating in space. Such antennas are usually used in ground stations for satellite communications. Use an unbalanced feeder, such as a coaxial cable, to connect the antenna. The center of the cable is connected to the spiral part of the antenna, and the outer sheath of the cable is connected to the reflector.
From the outside, the spiral antenna looks like a spiral installed on a flat reflective screen. The minimum size of the antenna depends on the frequency of the low-frequency signal used. If the spiral or reflector is too small, the efficiency of the antenna will be severely reduced. In the axial part of the helical antenna, the energy of the electromagnetic wave is the largest. A helical antenna is usually composed of multiple helical parts and a reflector. You can move the entire group of antennas vertically or horizontally to track a satellite at the same time. If the satellite is not in orbit, the azimuth angle of the antenna can be adjusted by the computer to track the satellite's trajectory.
The various advantages of the helical antenna are:
The drawbacks associated with helical antennas are as follows:
The applications of helical antennas include the following.
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