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Ceramic antenna for alumina ceramic substrate

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  The antenna has changed the communication methods all over the world. With the antenna, we have the development of the mobile terminal. With the antenna, we can communicate easily now, otherwise we are still in an era of communication. The small introduction of the ceramic substrate can be divided into a transmitting antenna and a receiving antenna according to the nature of the work. According to the use, it can be divided into communication antenna, broadcast antenna, TV antenna, radar antenna and so on. According to the directionality, it can be divided into an omnidirectional antenna and a directional antenna. According to the working wavelength, it can be divided into an ultra long wave antenna, a long wave antenna, a medium wave antenna, a short wave antenna, an ultrashort wave antenna, a microwave antenna, and the like. But let's not talk about it so complicated today, let's take a brief look.

Ceramic substrate

  Perhaps the antenna of many people's minds is the time when there was no cable TV. The antenna that stands outside is the kind of parabolic antenna that is like a "pot". It is big and small, and it is used to receive TV signals. Large satellite signal receivers and satellite signal transmitters, including the base stations that we hide around us on our usual days, and our mobile devices, will have antennas.

  Today, we are going to talk about ceramic antennas. With the development of communication technology, more and more ceramic antennas have entered the days of the people, such as cars, mobile phones, wearable watches, etc. Let’s take a look at the ceramic antennas. Make everyone chase.

  1. Working frequency bandwidth

  The electrical parameters of the ceramic antenna are generally related to the operating frequency, ensuring that the frequency allowed by the electrical parameter target changes, that is, the operating frequency bandwidth of the ceramic antenna. Generally, the working bandwidth of an omnidirectional ceramic antenna can reach 3-5% of the operating frequency scale, and the directional working bandwidth can reach 5-10% of the operating frequency.

  2, gain

  Gain is one of the primary goals of ceramic antennas. It is the product of the direction coefficient and the power. It is the embodiment of the ceramic antenna radiating or receiving the size of the wave. The choice of gain size depends on the requirements of the system planning for the area covered by the radio wave. In brief, under the same conditions, the higher the gain, the farther the interval between the waves is.

  3. Directionality

  Ceramic antennas have different radiation or acceptance capabilities in different directions of space, which is the directionality of ceramic antennas. Generally, the orientation of the ceramic antenna is measured. On the horizontal plane, the antenna that radiates and receives no maximum direction is called an omnidirectional antenna, and the antenna with one or more maximum directions is called a directional antenna.

  4, voltage standing wave ratio

  When the input impedance of the ceramic antenna and the characteristic impedance of the feeder are inconsistent, the magnetic wave formed by the reflected wave and the incident wave superimposed on the feeding line, the ratio of the maximum value to the minimum value of the adjacent voltage is the voltage standing wave ratio, which is the test feeder transmission. The basis of power, the voltage standing wave ratio is less than 1.5, the voltage standing wave ratio at the working frequency is less than 1.2, the voltage standing wave ratio is too large, the communication interval will be shortened, and the reflected power will come back to the transmitter power amplifier part, and it is easy to burn out the power amplifier tube. , affecting the normal operation of the communication system.

  So many advantages, of course, are inseparable from the ceramic word, the ceramic here, generally speaking, alumina ceramics, the general ceramic antenna is an alumina ceramic substrate, the ceramic antenna is so big, thanks to the alumina ceramics The substrate and the alumina ceramic substrate have excellent anti-interference, lightning protection, waterproof and dustproof effects, but this is not the focus. The focus is on the low dielectric loss of the alumina ceramic substrate, which is applied to the current high-frequency antenna. . With the alumina ceramic substrate, the size of the ceramic antenna can be made smaller, so that our mobile communication is stronger.
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