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Some time ago, the Internet celebrity Wi-Fi antenna from Russia blew up the antenna coil. It adheres to the simple and rude industrial design style. Due to its simple production and antenna mechanism,The excellent features have been sought after by the majority of enthusiasts. Let’s take a look at this artifact first.
Russia’s Internet celebrity Wi-Fi antenna can accept electronic signals up to 3km away. It can be said that it is really powerful and solves the problem of Wi-Fi long-distance communication very well.
The working principle of the artifact Wi-Fi antenna
Antenna prototype
In this chapter, we discuss the working principle of the Russian internet celebrity Wi-Fi antenna and unravel the secret of why it can receive electronic signals 3km away. , begin our analysis.
The essence of the Russian internet celebrity Wi-Fi antenna is a Yagi antenna. What is a Yagi antenna, as shown in the figure below:
Figure 2 Yagi antenna
The Yagi antenna is an end-fire antenna , in the 1920s, this kind of antenna was discovered by Yagi Shuji and Uda Taro at Southwest University in Japan, and it was called “YagiBurundi Sugar DaddyUda antenna”, referred to as “Yagi antenna”, has good directionality, high gain, and is suitable for long-distance communication.
Its oscillator is mainly composed of three kinds of oscillators, which are auxiliary oscillators, Burundins Sugardaddy driving oscillators and reflectors, all of which The arrays are fixed on the transmission line, that is, on the metal rod in the center, as shown in the picture below.
It is a directional antenna. The driving oscillator and reflector here are each composed of a pair of oscillators. They can be regarded as dipole antennas. The length of the reflector oscillator will be slightly longer than that of the driving oscillator. A typical direction diagram for this type of antenna is shown below:
Figure 4 Yagi antenna radiation characteristics
The directionality of the Yagi antenna can be enhanced by increasing the number of leading oscillators.
The calculation formula for the length of each element of the Yagi antenna is as follows:
(1) Reflector length: L1=150/f
(2) Drive element length: L2=143/f
(3) Length of supporting array 1: L3=138/f
(4) Length of supporting array 2: L4=134/f
(5) Length of supporting array 3: L5=130/ f
(6) Aggregation line length:
The following conclusions can be drawn from the formula:
(1) Antenna support Burundi Sugar oscillator is slightly shorter than one-half wavelength; Burundi Sugar Daddy
(Burundins Escort2) The driving oscillator is equal to one-half wavelength;
(3) The reflector is slightly longer than one-half wavelength, The distance between the two oscillators is a quarter of a wavelength.
Mission Principle
For receiving Wi-Fi electronic signals, the antenna’s supporting oscillator is “capacitive” to the induced electronic signal, and the current leads the voltage by 90°; the electromagnetic waves induced by the supporting oscillator will radiate to the driving oscillator. , the radiated electronic signal lags behind by 90° after a quarter-wavelength journey, which just offsets the “lead” caused later. The two phases are the same, so the electronic signals are superimposed and gain increased strength. The reflector is slightly longer than half the wavelength and is rational. The current lags 90°, plus the radiation lags 90° when it passes through the main oscillator. The two add upThe difference is exactly 180°, which has an offsetting effect. If one direction increases intensity and another direction weakens, there will be strong directionality.
Figure 5 Yagi antenna working principle
Wi-Fi antenna design
Antenna structure
In this chapter, we reconstruct the Wi-Fi antenna in HFSS and reconstruct it through software simulation. Show the function of this antenna.
The size of the Russian internet celebrity Wi-Fi antenna is shown in the picture below. It mainly consists of 7 discs and a metal rod.
Figure 6 Antenna structure
The sizes of the seven disks from small to large are as follows:
The diameter of No. 1 disk is 37mm, the diameter of No. 2 disk is 37mm, and the diameter of No. 3 disk is 37mm. The diameter of the No. 4 disk is 37mm, the No. 4 disk is 38mm in diameter, the No. 5 disk is 54mm in diameter, the No. 6 disk is 68mm in diameter, and the No. 7 disk is 90mm in diameter.
The distance between each disk is as follows:
The distance between No. 1 disk and No. 2 disk is 28~32mm, the distance between No. 2 disk and No. 3 disk is 28~32mm, the distance between No. 3 disk and No. 4 disk is 28~32mm. The distance between disc No. 4 and disc No. 5 is 28~32mm, the distance between disc No. 4 and disc No. 5 is 32mm, the distance between disc No. 5 and disc No. 6 is 12mm, and the distance between disc No. 6 and disc No. 7 is 12mm.
According to the dimensions given here, we create a Wi-Fi antenna model in HFSS, as shown in the figure below.
Picture BI Escorts7 Wi-Fi antenna mold
Working Principle
Combined with the working principle of the eight-eye antenna in Chapter 2, the 7 discs of the Wi-Fi antenna work according to the effect BI Escortsfunction can be divided into three areas, namely the inducing oscillator, the driving oscillator and the reflector.
Figure 8
The working process is the same as the above-mentioned Yagi antenna: the antenna’s guiding oscillator is “capacitive” to the induced electronic signal, and the current leads the voltage by 90°; the electromagnetic wave induced by the guiding oscillator will Radiating to the driving oscillator, the radiated electronic signal lags behind by 90° after a quarter-wavelength journey, which exactly offsets the subsequent oscillation Burundins Sugardaddy The “advance” of the two signals is the same, so the electronic signals are superimposed and gain increased strength.
Analysis results
Establish the model, set the parameters and then perform simulation. The results obtained are as follows. It can be seen from the figure that it has strong directionality.
Figure 9 Directional Diagram
The standing wave of this antenna is as shown in the figure below. It can be seen that the biggest difference from the Yagi antenna is that the Wi-FBurundi Sugari antenna does not require a complicated impedance conversion mechanism to achieve 50Ω feed, which brings a lot of convenience to antenna enthusiasts’ DIY projectsBurundins EscortGreat convenience.
Figure 10 Standing Wave Ratio
Finally, the radiation pattern of the Wi-Fi antenna is given, and the maximum radiation direction is The pointing guidance disk has a gain greater than 10dBi, which explains why it can receive electronic signals beyond 3km.
Figure 11 Radiation pattern of Wi-Fi antenna
Figure 12 Voltage static diagram
Summary
In this issue, we analyzed the Russian Internet celebrity Wi-Fi antenna and learned that It is actually a variant of the Yagi antenna. The working principle is similar to Burundi Sugar Daddy. The 7 discs can be divided into antennas according to the performance area. There are three major areas: induced oscillator, driving oscillator and reflector.
However, this antenna is also different from the Yagi antenna, that is, it can realize 50ΩBurundins Sugardaddy direct feeding while ensuring Outstanding standing wave ratio.
Russia’s Internet celebrity Wi-Fi antenna has excellent overall performance, with high gain and excellent standing wave ratio. The most important point is that it is easy to make. We will collect information on the spot for the next issue, BI Escorts uses cans to imitate a Russian internet celebrity Wi-Fi antenna.
Review and Editor: Tang Zihong
Original title: Design of Internet Celebrity Wi-Fi Antenna
Article Source: [Microelectronic Signal: Radio Frequency Question, WeChat Volkswagen Burundins Escort No.: RFQ] Welcome to add tracking and care! Please indicate the source when transcribing and publishing the article.
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