Keywords: 900MHz antenna dimension diagram
This is a simple and easy high gain orientation antenna, classic eight wood antenna structure, as shown below:
Note: This antenna is the Japanese eight-wood inventions, so it is called eight wood antennas.
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The linear vibrator is made of φ10mm aluminum tube, and the aluminum strip of 10 × 3 mm is used as a cross section. Among them, the reflector 200mm, the guide 130 mm, and the oscillator is 150 mm.
This antenna is preferably used between 800-900 MHz, and the upper limit can extend to mobile communication band of mobile phones. The effect is still still, and the gain after 970 MHz has decreased sharply. The lower limit can be reduced by 780 MHz, 750 MHz or less gain.
As for the number of the leader, it can be selected according to the actual situation, and the more better, but the gain is not much increase, but the total length of the antenna has increased. According to the measured, the antenna gain is about 10 dB during seven leaders, as shown in the figure, about 15 dB.
The collection antenna picture is as follows:
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In this year, the purpose of making this antenna is to solve the problem of high-power (milliwatt) TV signal long distance (tens of kilometers) orientation, and then discovering that this antenna is also very good at the transmission and reception of mobile phones in the 900MHz band. Performance, Test and summarize several usage, which is used to solve the use of mobile phones in the weak signal area. Please note: It is a weak signal area, not a signal area, and it is not available in no signal area.
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One of the usage
This is also the simplest and most convenient purpose.
The first is the location, it is the best position to find the signal. If it is in your own home, I am afraid you don't have to find it. You must have a clear location you can turn on the phone. But this is likely to be a location where you are not convenient to use, often the roof, hillside, etc. outside the house. You can set the antenna here and introduce the chamber with a coaxial cable. Note: The cable cannot be too long and should be controlled within 20-30 meters.
Introducing the cable end of the room does not have to connect to the phone, you can pick a launch ring, put the phone next to the launch ring, you can use it. If you suspect that the launch cycles can also peeled off 10 cm long outer conductors at the end of the cable, the remaining internal conductors become a quarter wavelength launch antenna, close the phone close to the antenna, the effect is also good. .
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Usage two
This use is to allow you to use a mobile phone in a certain range in the house, which is convenient, but you have to pay some silver, get a dozens of dollars. The installation use is shown below:
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The system in the figure is within and outdoor. The installation and commissioning of the outdoor part is relatively simple, and the antenna can point to the strongest direction of the signal, and the system works basically depending on the installation and commissioning of the indoor part.
There are two main commissioning in the indoor part: the position of the transmission and reception of the antenna and the gain of the two amplifiers. The gain of the two amplifiers is of course better, but the high-loop of the high will be self-contained. The total gain of the two amplifiers cannot be greater than the sum of the separator isolation and the transmission and reception antenna isolation. The isolation of the dispenser is related to its own quality, so that the total gain is mainly controlled by the isolation of the transmission and reception antenna. That is to say, the relative position of the adjustment of the transmission and reception antenna is the main debugging content of the system.
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Usage three
The two described above are relatively simple methods, and generally have an electronic enthusiast with certain hands-on capability to complete the experiment.
Here is an apparatus approximately a regular mobile phone signal amplification station, which is different from all of the transmission and reception antennas, which is an expensive duplexer, as shown in the following figure.
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Since both amplifiers have a strong restriction characteristic, the amount of external suppression is large enough, so the gain of the amplifier can be used to 40-50 decibels, which is sufficient for ten square meters of rooms.
Although the system uses an amplifier that is large enough to inhibit the external inhibition, the large loop self-participation is not formed, but the coupling between the interior and outdoor antennas is used due to the use of higher gain amplifiers, the coupling between the indoor and outdoor antennas. The large rings in the channel are self-excited. Therefore, the installation location of the indoor and outdoor antennas should ensure sufficient isolation between the antennas.
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