For walkie-talkies, the walkie-talkie antenna is a very important component. The quality of the walkie-talkie communication is almost closely related to this component. Because of its low price and simple physical object, it often fails to attract enough attention from users and production equipment manufacturers. .But the walkie-talkie antenna plays a vital role in the user's use. This is about the experience of the walkie-talkie. Let the walkie-talkie have a substantial improvement in the user experience and the effect of the walkie-talkie. The antennas of walkie-talkies are roughly divided into three categories:
Because the line and the handheld are directly fed, we call it an active antenna. The module motherboard of the antenna handheld is connected to the antenna, so the motherboard module has a great influence on the antenna radiation pattern. Different motherboard modules and shell antennas The radiation pattern is different, and the different radiation patterns make the communication quality of the walkie-talkie very different. Users often think that the standing wave ratio of the walkie-talkie and the antenna can be adjusted, but there are many cases where the standing wave ratio is adjusted to VSWR<=1.2 is still not far, what is the reason? It is caused by the distortion of the antenna's radiation pattern or the splitting of the main lobe. The antenna's radiation pattern is determined by the design and production of the antenna. The test must rely on accurate radio waves. Darkrooms and automatic precision RF test equipment are not detectable for users, and tests must be provided by the antenna manufacturer or walkie-talkie manufacturer.
The walkie-talkie and the antenna are fed through cables, and the design of the antenna is related to the car shell. This type of antenna is generally installed with a magnetic attraction
It is installed on the roof of the car or perforated. In recent years, there are also such antennas that are attached to the glass or hidden in the car. The key is that the adjustment of the standing wave ratio and the installation position directly affect the antenna
Radiation diagram, standing wave ratio is generally directly related to the antenna design, the quality of cables, and connectors. Users should pay attention to them when choosing. The radiation pattern is related to the location where the antenna is installed. Ideally, it is best to install it in the center of the roof, because the reflective floor of the antenna is symmetrical and uniform, and the antenna pattern will not be distorted. For example, the antenna radiation pattern is easy to install on one side. Changes.
Base station antennas are generally called outdoor antennas
This type of antenna is divided into omnidirectional antennas and directional antennas. Both types of antennas have dozens of choices of forms and gains. Generally, users should customize the antenna according to the direction of the set location. In principle, the customized antenna should be customized according to the installation environment. For example, the antenna is installed on a tower or on the ground. Installation on a cement-cast roof is more different from installation on a full-tile roof. Therefore, the antenna wave transmission angle is required to meet the requirements of communication distance. For example, when installed in a high-rise base, the communication quality is good on one side and poor on the other. , Or the signal becomes worse at a turn. If the base station antenna is installed on the ground and the communication area on the top of the tall building is on the ground, the standard antenna pattern has a downward inclination of 5-10 degrees. If it is installed on the ground to communicate with a tall building, the antenna design must have an upward inclination.
We all know that the antenna of the walkie-talkie and the transmission and reception match of the walkie-talkie must be proportional. The antenna is a device that emits electromagnetic waves into the air. We usually use walkie-talkies to send more energy (or power) into the air so that when the other party receives the signal, there is enough energy to restore the content of the information. The antenna is an important part of the transmitting part. Should I choose a long antenna or a short antenna?
In fact, the antenna of the walkie-talkie is not distinguished by the length of the antenna, the antenna is distinguished by the frequency band. Although usually long antennas and short antennas are often used when choosing antennas, the final choice is based on the frequency written by the walkie-talkie.
You can look at the bottom of the antenna. Generally, there will be a note on the bottom of the antenna, explaining the frequency range of the antenna. If the frequency written by the walkie-talkie is within this range, the antenna is suitable. Of course, each walkie-talkie produced by each walkie-talkie manufacturer has a center frequency.
Therefore, if the walkie-talkie uses a long antenna, the communication signal is not necessarily good; if the walkie-talkie uses a short antenna, the communication effect is not necessarily bad. The frequency of the antenna and the walkie-talkie are adapted for better communication. The antenna is just an auxiliary!