无线网卡天线制作

无线网卡天线制作 OM3RKP - WI-FI antenna - Printable version http://www.om3rkp.cq.sk/articles.php?lng=en&pg=4&prt=1 1 of 4 7/15/2008 11:15 PM OM3RKP http://www.om3rkp.cq.sk/ WI-FI antenna (Constructions) WI-FI band (2.45 GHz) is not so far from 2.3 GHz what is a radioamate...

OM3RKP - WI-FI antenna - Printable version http://www.om3rkp.cq.sk/articles.php?lng=en&pg=4&prt=1 1 of 4 7/15/2008 11:15 PM OM3RKP http://www.om3rkp.cq.sk/ WI-FI antenna (Constructions) WI-FI band (2.45 GHz) is not so far from 2.3 GHz what is a radioamateur band 13 cm. An idea of G6KSN was the base how to build own WI-FI antenna. I have compared three WI-FI antennas: original from AP, home made DL7KM (twin quad) and 10-element yagi loop. The last is the best. It's not a problem to copy signal from AP in distance 4.5 km! The building is relative easy (easier than it looks). Things needed: PCB, N-type connector, piece of thin 50 ohm coax, some Cu wire with 1,5 mm diameter, Cu tube 8 – 12 mm, knife, soldering iron, etc. An inspiration for building this antenna is an article http://www.paramowifix.net/antenas/loop_uda_yagi/. This looks a little bit too long. I choose smaller version with 10 elements. Total lenght of mine antenna does not exceed 30 cm. Here is an output from programm: OM3RKP - WI-FI antenna - Printable version http://www.om3rkp.cq.sk/articles.php?lng=en&pg=4&prt=1 2 of 4 7/15/2008 11:15 PM Reflector was made from a piece of PCB. Diameter of the ring is near the same like diameter od CD. Drill a hole for N-type connector. With a soldering iron connect to the reflector boom (Cu tube). Make the marks on tube in the element positions. Elements are made from Cu wire. Each ring was made so: cut an exact length of Cu wire for element (for example 135 mm). Wind it on a tube with a little bit smaller diameter how the ring should have. OM3RKP - WI-FI antenna - Printable version http://www.om3rkp.cq.sk/articles.php?lng=en&pg=4&prt=1 3 of 4 7/15/2008 11:15 PM Hold the elements in a position and connect them to the boom with a soldering iron. The driven element is cutted in the half. There is connected a piece of coaxial cable (RG-58, semirigit, etc.). The other end is going to the N-type connector. Leads should be short as possible! Mechanical construction: OM3RKP - WI-FI antenna - Printable version http://www.om3rkp.cq.sk/articles.php?lng=en&pg=4&prt=1 4 of 4 7/15/2008 11:15 PM A program Loop Yagi CALC You could obtain .: HERE :.. Antenna was sucesfully tested and used on WI-FI band. But there is a premise that it should work good also on radioamateur bands. Be careful with a polarizations of signal, especially on WI-FI (horizontal, vertical, mix). Setting-up for best signal needs few minutes.

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