The development trend of RF connector

1. Miniaturization: With the miniaturization of the whole system, the volume of RF connectors is getting smaller and smaller, such as SSMB, MMCX and other series, the volume is very small. High frequency: HP in the United States has introduced RF connectors with a frequency of 110GHz a few years ago. The use frequency of domestic general products does not exceed 40GHz. Flexible cable frequency does not exceed 10GHz, half rigid cable does not exceed 20GHz. 3. Multi-function: In addition to the role of a bridge, it also has the function of processing signals, such as filtering, phase adjustment, frequency mixing, attenuation, detection, limiting, etc. 4, low standing wave, low loss: to meet the needs of weapon systems and precision measurement. Large capacity and high power: large capacity and high power are mainly adapted to the development needs of the information superhighway. 6, surface mount: mainly adapt to the development needs of SMT technology (surface mount technology), and is conducive to simplifying the wiring structure design of multi-layer printed board.

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Flat panel antenna technical indicators

Like the reflective parabolic antenna, take the small flat-plate antenna of the sea brand as an example, we also look at the technical indicators of the slot flat-plate antenna.

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What does antenna gain mean?

The direction map of the omnidirectional antenna in the true sense should be the star However, the omnidirectional antennas currently in use are actually only circles on the horizontal plane and long strips on the vertical plane. From the three-dimensional understanding is a bagel The directional antenna is a big pear From the perspective of energy conservation, it is explained that if the energy of the star is compressed in the doughnut, of course, gain will appear. The antenna is a passive device that has no amplification effect. It is because the arrangement of vibrators inside the antenna makes the original all-round emission concentrated in a certain area that there will be superposition effect, making the antenna produce gain. So the more compressed, the higher the antenna gain.

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Dielectric plate antenna structure

If we cut the antenna surface of a dipole plate antenna imported in the past, we will see that the antenna surface is composed of five layers of materials.

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Slot plate antenna

Earlier we talked about the slot-type flat-panel antenna, which is very small in size but very efficient. Such a small flat-panel antenna has such high efficiency. What is its structure and what does it look like?

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Working principle of planar antenna waveguide

在谈缝隙式平板天线工作原理之前,让我们了解一下有关波导的情况。波导是用金属材料制成的不同形状,内空外封闭传输信号的腔形导体,它有园波导、椭圆波导、方波导、矩形波导等,见题图。目前常用的高频头前端腔体就是一种圆波导,单极化高频头的馈源部分有的就是矩形波导

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Flat panel antenna definition

It is an antenna that propagates in only one specific direction. Flat panel antennas are generally used in point-to-point situations. You may also see them called "patch antennas".

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Plate antenna

An antenna that propagates in only one specific direction. Flat panel antennas are generally used in point-to-point situations. You may also see them called "patch antennas".

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Antenna active test

At present, more and more attention is paid to the radiation performance test of the whole machine in the radio frequency performance test of the mobile phone, which reflects the final transmission and reception performance of the mobile phone. At present, there are two main methods to investigate the radiation performance of mobile phones. 1. One is to judge from the radiation performance of the antenna, which is the more traditional antenna test method, called passive test;

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Introduction to the concept of wireless transmission line

The wire connecting the antenna and the output (or input) end of the transmitter (or receiver) is called a transmission line or feeder. The main task of a transmission line is to efficiently transmit signal energy. Therefore, it should be able to transmit the signal received by the antenna to the input of the receiver with minimum loss, or the signal sent by the transmitter to the input of the transmitting antenna with minimum loss, and it should not pick up or generate spurious interference signals. Thus, the transmission line must be shielded or balanced. When the geometric length of the transmission line is equal to or greater than the wavelength of the transmitted signal, it is called a long transmission line, or long line for short.

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FRP antenna not suitable for indoor use

1. Why is the glass fiber reinforced plastic antenna not suitable for indoor use? A: Many people may notice that international brands such as linksys or dlink generally only use 7db or 5db or 2db antennas on their equipment, but they seldom see their 9db or higher gain indoor omnidirectional antennas on the market. According to our understanding, 7db antennas have fully met the requirements for indoor use, while antennas above 7db cannot give full play to their advantages due to smaller angles, indoor use may also be counterproductive. Therefore, we suggest that omnidirectional antennas above 9db must be recommended for outdoor use. As for some people who say that indoor wall penetration is effective, this statement cannot be verified and need not be too convinced.

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The most important factor affecting the effect of the antenna

According to the purpose, it can be divided into communication antenna, broadcast antenna, TV antenna, radar antenna, etc. According to the working wavelength, it can be divided into ultra long wave antenna, long wave antenna, medium wave antenna, short wave antenna, ultrashort wave antenna, microwave antenna and so on. According to the structure and working principle, it can be divided into line antenna and surface antenna. Describe the characteristic parameters of the antenna, such as pattern, directivity coefficient, gain, input impedance, radiation efficiency, polarization and frequency

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Keywords: digital TV antenna, vehicle antenna, RF line/feeder, suction cup antenna