1. Directional Antennas
Directional antennas, also known as directive antennas, are mainly used in radio communications. They can transmit a strong signal, but can only receive and transmit signals in a specific direction. The main characteristics of directional antennas are that the receiving and transmitting distances are relatively long, the signal strength is large, but signals can only be received at a certain fixed angle.
2. Broadband Antennas
Broadband antennas refer to antennas with a wide frequency range, which can cover multiple frequency bands. Their main use is in occasions where frequent frequency or frequency band changes are required. An important feature of broadband antennas is that they can switch between different frequency bands, so they can support multiple signals simultaneously.
3. Fan-shaped Antennas
Fan-shaped antennas are planar antennas mainly used to transmit or receive signals within a fan-shaped coverage area. Fan-shaped antennas can adjust their radiation angle and coverage angle according to needs, and are usually installed on towers or buildings to increase their coverage range.
4. Circularly Polarized Antennas
Circularly polarized antennas are antennas that rotate the electric field during transmission and reception, and the polarity of the output electric field has both vertical and horizontal components in space. The main characteristic of these antennas is that they have better resistance to multipath interference and can improve the reliability of signal transmission.
5. Square Polarized Antennas
Square polarized antennas are antennas whose electric field direction is perpendicular to the antenna direction during transmission and reception, which can improve the transmission efficiency and stability of signals. Square polarized antennas are mainly used in environments with weak signal transmission, such as mountainous areas or areas with many building obstructions.
6. Antenna Arrays
Antenna arrays are an integral whole composed of multiple antennas. Using this technology can not only improve the gain and directionality of the antennas, but also reduce the size and weight of the antennas. Antenna arrays can be divided into two types: passive arrays and active arrays. Passive arrays can improve the sensitivity of received signals, while active arrays can increase the transmission power.
In general, there are many types of radio frequency antennas, and each antenna has its own characteristics and application scope. In practical applications, an appropriate antenna type should be selected according to actual needs to improve the transmission quality and distance of wireless signals.