We should all know about antennas. Any radio communication system is inseparable from the composition of antennas. We all know that antennas are used to radiate and receive electromagnetic waves. Antennas can make a wireless transceiver device receive and transmit stronger signals. What principle is this based on? It turns out that there is a key component in the antenna, which is the antenna oscillator. So let’s learn about the antenna oscillator.
As shown in the figure, the two straight wires that generate an electric field are called oscillators. Simply put, they are a section of metal conductor that emits and receives high-frequency vibration signals. The antenna oscillator has the effect of guiding and amplifying electromagnetic waves, making the electromagnetic signals received by the antenna stronger. The antenna oscillator is the most basic unit that constitutes the antenna. When there is alternating current flowing on the wire, electromagnetic wave radiation can be generated. The radiation capacity is related to the length and shape of the wire.
Antenna oscillator classification
Antenna oscillators are divided into basic oscillators, symmetrical oscillators, and half-wave symmetrical oscillators, which are related to the length and shape of the antenna wire.
The closer the distance between the two wires is, the electric field will be bundled between the two wires, and the radiation will be very weak; when the two wires are opened, the electric field will spread in the surrounding space, and the radiation will be enhanced. When two wires are aligned in a straight line, they become an antenna.
When the length of the wire is 1/4 of the signal wavelength, the intensity of radiation is maximum, which is called the fundamental oscillator.
When the length of the two arms of the wire is equal to the oscillator, it is called a symmetrical oscillator.
An oscillator whose length of each arm is 1/4 wavelength and whose total length is 1/2 wavelength is called a half-wave symmetric oscillator. The half-wave symmetrical oscillator can be used independently or as the feed source of a parabolic antenna.
Antenna oscillator information
The traditional antenna vibrator is actually an antenna, and the material used is metal or PC board. The advantage of metal is that it is simple and cheap, but the disadvantage is that it is heavy and bulky; PC boards are easy to process, but have high labor costs and low efficiency.
At present, the materials of vibrators are all metal. The main problems faced by vibrators made of metal are that they are expensive and heavy, which makes it very difficult to control the weight of the antenna.
With the development of the times, plastic vibrators are now available. Using plastic materials as the main material of the antenna can not only greatly reduce the weight but also control the cost of the vibrator well.
There are currently two ways to make plastic vibrators. One is to use LDS materials combined with metal materials, and the other is to use PPS or LCP for electroplating. At practical frequencies, the dielectric loss of LCP is 1.5‰, which may be lower at 2.5GHz. However, the price of LCP is higher, twice that of PPS.
As a key component in the antenna, the antenna oscillator plays a vital role in the operation of the antenna. The quality and quantity of the oscillator also affect the antenna gain. Therefore, the optimization and upgrading of the antenna oscillator is an essential process to reduce the cost of the antenna oscillator. and weight, are crucial regarding the development of the antenna. The above is the introduction of the antenna oscillator.Keywords: Ethernet IO control