DIY 2.4G Wifi cylinder antenna, WiFi Antenna
Keywords: DIY 2.4G WiFi cylinder antenna
DIY 2.4G WiFi cylinder antenna
I always think that DIY antenna is a very difficult thing, affected by BG7IOO, I am now fever for the antenna. Since I receive my own technical and equipment restrictions, I usually only play the antenna of the handset, usually often chatting with BG7IOO long-distance chat line, the right to live! Recently, I am addicted to the WiFi of the 2.4G frequency band, WiFi is fascinating that it is the wireless extension of the wired broadband network! However, due to the limitations of technical specifications, the transmission power of WiFi devices is very low, generally the power of MW. In this way, the distance between data transmission is stretched. In view of this, many amateur radio enthusiasts are passionate about being an article on WiFi antennas. In order to let your WiFi device can insert a wings, I will make up my determination DIY a WiFi Ant!
Step 1: Selecting the Internet to collect the antenna information first, seeing many foreign antennas Diyer's WiFi antenna is really a five-flowers! 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. At the same time, in 2005, "Amateur Radle" Conference No. 4 has also been introduced. However, I like to call its name as "cylinder antenna"!
Step 2: Making the cylindrical antenna is convenient, because everyone must have iron cans and metal tubes. I just took a milk powder pot. Below is the production chart of the picture I refer to the foreign website. The data is as follows: Central frequency point = 2.445G cylindrical diameter = 127mm cylindrical length = 111mm Zheni length = 31mm oscillator distance from cylindrical bottom margins = 37mm
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As can be seen from the picture, the screen of the feeder is connected to the metal cylinder. The signal is reflected onto the vibrator through the cylinder, and of course the vibrator is the core wire of the feeder, the core wire and the metal tube are insulated, this must be aware!
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While referring to foreign enthusiasts, I joined my own idea: Many enthusiasts like to install N-head or BNC seats in the cylinder, and then do the corresponding N-head or BNC head in the joint connection. In connection. But I think that although this method is very convenient to use, it also causes losses (estimated 1-2dBi), especially in the frequency band of 2.4G! Therefore, I decided to directly weld the shield 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!
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Feeder I use a double-shielded RG-58 cable that is the 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 I use is smaller than that of the length, the length is taken in this value. 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.
Step 3: When the test starts, I browse foreign enthusiasts discuss how the WiFi antenna gain is high, how to improve the improvement, always feel a bit boasting. But when I found the effect in actual testing, I really had a big change! In this test, the device I used 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 the experience, the general WiFi equipment is very poor when the effect is used in the anti-theft network, so I have not had a lot of hope. When using the original antenna, I searched 3-4 external signals (normal phenomena) with AP, and surprised to receive 7-8 external signals 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 made upless by undesirable production, I believe I believe in science. I am also a newbie. I didn't have much hope to make an antenna. When I take the first step, you will try the endless fun and knowledge brought about by practice! 2. More than the same as good as you have experience, listen to the opinions, while doing while learning, 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 should be selected. 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. Because of the more written building near my home, naturally use wireless network companies, and the distance between the buildings is relatively wide, so the balcony in my home can receive so many network signals, this is again verified "Good Machine" It is better to make an antenna, good antenna is not as good as it is good! "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. 6. The diameter of the cylinder antenna, the calculation value of the vibrator, the length of the length can be directly input in the web page: http://www.saualahti.fi/Elepal/antenna2calc.php related WiFi antenna production website: http: // www . Binarywolf.com / 249 / http://www.qsl.net/VE3RGW/CORNER.HTMLHTTP: //www.turnpoint.net/wireless/cantennahowto.htmlhttp: //trevorMarshall.com/biquad.htmhttp: // www .xaviervl.com / antenne / bi-quad / index.html is a little experience in my Diy WiFi antenna, I hope that the seniors and enthusiasts are more advisory! Thanks!
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The figure below is the calculation link of the cylindrical antenna, which is more than the calculation link provided by the previous WiFi article No. 4 before the 2005. The calculation link address is: http://www.wikarekare.org/antenna/waveguidecan.html
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