The wireless router is increasingly popular, and the discussion leads to more and more. In particular, the problem of signal strength and reception is quite worth noteworthy. And everyone thinks, more feasible means is to adopt a gain antenna. At the same time, given a "30 kilometers of possible! Tenda long-distance wireless router arrived" in view of the pre-editor, it is also a great role in the gain antenna. Therefore, the editor specially collects the example of the relevant production antenna, from the domestic and foreign, from the low end to the ultimate, with a relatively objective angle, show how much the antenna is made, what is the effect of the antenna can achieve. The determinant of the determination of the working principle of the gain antenna is to place the rule of metal paraboloid around the existing antenna, so that the antenna is located at the inner reflection focus of the parabolic, and the electromagnetic wave reflection is formed at the focus, thereby enhancing the transmission and reception of electromagnetic signals, implementation Enhance the signal in a specific direction. The key to making a simple gain antenna is to find a comparative rule metal parabolic and calculate the focus position of the parabolic. Metal paraboloid does not necessarily require a metal plate, or a mesh, a fence metal material. The determination of the focus position needs to be calculated based on the shape of the selected parabolic. Calculation formula: f = D × D / 16H (m) where D is the diameter of the parabolic, H is the depth of the parabolic, and the unit is m. Considering that there is a certain error, it can be calculated using a simpler estimate formula, ie F = 0.3d ~ 0.4d. In a simple Wi-Fi wireless network, including wireless routers or wireless APs, and wireless network cards, etc. Therefore, it is necessary to enhance the transmission efficiency of the wireless signal, and will start with two aspects of the transmission and reception gain of the wireless router or the wireless AP antenna and the wireless network card. Next, let's take a look at the production method of the wireless router or the wireless AP of the gain antenna and the production method of the wireless network card gain antenna. First scholastic milk powder can antennas (taken from PConline Wireless Network Special Zone) 1. Selective first online collection of antenna information, seeing many foreign antennas Diyer's WiFi antenna is really a five-flowery! There is a spiral antenna, there are eight wooden antennas, there is a rhombus antenna, a grid antenna, and a canned antenna ... make people look dazzled. After repeated screening, it ultimately locks the production target on the canned antenna. Choosing it is mainly because this antenna is convenient and efficient! It is very suitable for beginners. Second, the reason why the cylindrical antenna is made is convenient, and it is necessary to have a iron can and metal tube because everyone must have a tank. The author just took a milk powder can. Below is the production chart of the picture of the foreign WiFi website. The data is as follows: The center frequency = 2.445g cylindrical diameter = 127mm cylindrical length = 111 mm Zhenzi length = 31mm Zhenzi = 37mm From the picture, the screen is connected to the metal cylinder, the signal passes The cylinder is reflected onto the vibrator, and of course the vibrator is the core line of the feeder, the core wire and the metal tube are insulated, this must be aware! While referring to foreign enthusiasts, the author has joined their own ideas: Many enthusiasts like to install N-headed N-top or BNC seats in the cylinder, and then do the corresponding N-head or BNC header at the connection of the feeder. In connection. But the author thinks although this method is very convenient to use, it also causes losses (estimated 1-2dbi), especially in the frequency band of 2.4G! Therefore, MR7 determines that the shield is directly soldered directly on the cylinder (first grinding the outer casing before welding), and the core of the vibrator retains its original foam insulation. This will minimize the loss. A little special taste! It is recommended that everyone is best to find a small copper tube and heat shrink sleeve that is slightly smaller than the feeder before welding. First put the copper tube in the feed line, then take the shielded net to the outer casing of the metal cylinder, then The heat shrink sleeve is rotated multiple times with a hot air cylinder, and the feeder is fixed on the copper tube, so that it can reduce the impact of the feed line and the vibrator due to the adjustment antenna! The feeder author is a double-shielded RG-58 cable, the joint is a SMA mother head for connecting to the AP of WiFi. Generally, the larger the diameter of the feed line, and the length should be as short as possible, otherwise the loss caused by the excessive length of the feed is larger than the antenna gain, and the meaning of DIY is lost! The feeder diameter used by the author is taken from 1 meter in length because of the relatively small. Good feeder is the key to the production of antennas, and the signal of the signal of the 2.4G band is much larger than 400 MHz in the wire, so the feeder must be placed with a shielded net to block the aluminum double shield, and the core wire should be as thick as possible. Latest Reply Bonis AT 2007-10-29 01:47:07 Third, the test begins, MR7 browsing foreign lovers discuss how the WiFi antenna gain is high, how is the improvement situation, always feel a bit boasting . However, when MR7 found in actual testing, it was found that the use effect really happened! In this test, the device used by MR7 is D-Link DWL-G810 (800AP) five-in-one AP, which can pass software The brush machine also has an AP, bridge, relay and other functions, and the transmit power is 32MW. At the test site, the balcony at home is in the anti-theft network (no way, the metal cylinder is rough, and the anti-theft net is extended). According to experience, general WiFi equipment is very poor when the effect is used in the anti-theft network, so MR7 has not had a lot of hope. When using the original antenna, MR7 searches 3-4 external signals (normal phenomena) with AP, and surprisingly found that 7-8 external signals can be received after replacing the homemade WiFi cylindrical antenna. The number of reception is replaced. There are more than 100% of the antenna, it is really unexpected! Can't help but secretly making the antennas made by yourself. Summary: 1. This antenna is indeed suitable for beginners amateur production. You don't have to be difficult to make it, you have to believe in science. The author is also a newbie. I didn't have much hope to make antennas. When decisive, you will try the endless fun and knowledge brought about by practice! 2, more exchanges with the best, listen to all opinions, doing while doing, this will take less detours. 3. The size and material when making antenna are the key to success. To grasp the accuracy of the size, the material is selected to select quality. In this production, every time I cut, it is repeatedly measured, and the accuracy is at least the MM level. In terms of materials, I use a thick iron pot, and the feeder is imported double shielded cable. 4. Due to more written in the vicinity, naturally use wireless networks, the distance between the buildings is relatively wide, so the balcony in the family can receive so many network signals, this is again verified "Good Machine is not as good as good The antenna, good antenna is not as good as it is spread! "This experience. 5. According to the data provided by the player, the gain of the WiFi cylinder antenna is around 12 dBi. If it is improved, add a horn-shaped metal ring outside the antenna, which can also increase the gain of 3dBI, everyone may wish to try! Mean that the antenna is not suitable for the AP of wireless relay function, it is recommended to use the high gain coaxial whole antenna when wireless relay. Gongzi AT 2007-10-29 01:47:48 Strengthening the Improved Typeless Air Basil (Excerpted from the PCONLINE Wireless Network "If the wireless router or wireless AP is not suitable for the installation of the gain antenna, then we should increase the transmission distance and efficiency of the wireless signal. Obviously, only the gain antenna is added to the wireless network card. The author describes how to make a wireless network card gain antenna in a USB wireless network card. First, look for materials first look for a metal appliance with rule parabolic, then what do you think of? Soon you will think of the iron pot at home, but the quality of the iron pot is heavier and is not suitable for fixing and installation. Ok, our ancestors have invented the good item "Long Pozzle" for us to make a gain antenna before the millennium (Figure 3), is it a little doubt? You will know that it can be used to fish dumplings and noodles. To make a gain antenna. Second, the tools that may be used during the preparation of tools have tools, pointed pliers, rubber tubes, and USB cables. The hand saw is used to treat the drain or make it suitable for its length. The pointed pliers is used to cut a suitable gap (Fig. 4) in the center of the gloss. The role of the rubber tube is to secure the USB connector on the drain according to the distance of the focus; the USB cable is to connect the wireless network card to the computer. Of course, you still have to prepare a ruler, if you need to need paper, pen and calculator to measure and calculate the focus position. Third, the calculation focus position determines that the focus position can determine the length of the rubber tube to fix the rubber tube and wireless network card. The length of the bottom center of the focus distance can be calculated by the focus distance can be calculated, and it is to be noted that the length of the USB network card is to be considered because the antenna of the USB wireless network card is built-in. Open the USB wireless network card, the built-in antenna is on the left white position. This way to ensure that the bottom of the USB wireless network card is located in the focus position. If the USB wireless network card itself is not enough, it is necessary to support the USB wireless network card with rubber tubes. [This post was last edited by the son. 2007-10-29 01:49 Edit] Mono AT 2007-10-29 01:48:12 Fourth, fixed USB wireless network card After determining the focus position, you can perform USB wireless network card Fixed. Be sure to measure the length of the USB network card and the length of the rubber tube, the length of the two should be equal to the calculated focus distance. V. For the antenna production bracket, you can use the original bamboo plate for the air discharge. However, every time you use it needs to be fixed, in which case it needs to make a bracket to the antenna, and make a three-foot bracket very strong. The material can be arbitrarily selected as long as the bracket material is insulated from the discharge antenna. For example, you can use three bamboo chopsticks to make a bracket, of course, you can also be extravagant, use the tripod of the used camera to do the bracket. After five steps, a cool USB wireless network card gain antenna is successful, using the USB cable to connect to your computer, you can experience the "pleasure" that the homemade gain antenna will bring you. Summary: This method is also based on the basic principles of the production gain antenna we introduce, the original antenna of the USB wireless network card is a better gain antenna, and the key is to choose the right metal parabolic material, calculate the parabolic focus. It is characterized by a significant effect, simple, and zero cost, is the best solution from the end to enhance wireless signal transmission and reception. Moses AT 2007-10-29 01:50:06 Ultimate metamorphosis satellite receiver antenna (from PCPOP) milk powder can antennas, cannon the antennas have seen it, don't you strong enough? Foreign fanatic wireless network enthusiasts success DIY a wireless signal transmitter, and established a 125 mile-wide wireless network area through the old 10 feet satellite antenna. Let's take a look at how this is achieved. Tools are ready, let's start making it. First, a relatively coarse copper wire is first folded into the picture below. The subject part of the entire antenna is a silver connector, and the copper antenna will be connected to the bottom plate through this connector. The antenna is secured to the bottom plate through the connector fixed antenna, and it is important to note that the antenna cannot be contacted with the bottom plate, so it can be used to maintain some support tools, the distance of the antenna and the bottom plate. The bonus is more than the antenna assembly, and it is easy to install this wireless network signal transmitter with the old satellite receiving antenna. Satellite antenna high frequency head connection Antenna base antenna and base connection The final finished product From the above picture we can see that when placed on the horizontal plane, the basin of the receiver has become an angle of about 45 degrees. The parallel antenna with the receiver is also 45 degrees with the ground. For DIY's results, we also have a simple test, please see the picture below. From the test software, the CH6 signal is Town C on 2.6 mi It can be seen that the self-made wireless signal transmitter coverage is still very wide. More AP tests are installed on the car, which is convenient for mobile summary: Although the DIY style is now popular, this metamorphosis wireless signal transmitter is made slightly hard to general users, and the production of the manufacturer network and hands-on High, and the final part of the test, it is also the unable to complete, and the large-scale wireless network covers some problems in terms of security, but this kind of DIY is still just waiting for it. Imagine, in the future How is it in the wide field of fields to use a notebook through a wireless network. Summary of the full text: Technology is constant, and our DIY spirit is never ending. What a powerful antenna has a distance that is a long distance, and people's thoughts are boundless. I have seen these three cases of DIY cases from shallow to deep antenna. What do you think? Welcome everyone to discuss a warm discussion.
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