Front view of the Bi-Quad. Click for a 1:1 scale view. (Note that if you click on the above diagrams they will open as 1:1 scaled versions. I decided to make them available if you want to manufacture this antenna yourself. The easiest is to print them to 100% of the original size and use these as footprints/templates to construct the antenna.) Manufacturing process explained in 6 steps: Step1: Cut 2 pieces of 2 mm copper brazing wire and bend to follow the profile of the printed diagram. Vadivelu billadon comedy mp3 dialogues. Jul 14, 2014 After reading on how effective biquad antennas where for wifi, I'm experimenting with an 855.00mhz antenna designed for a truncked system 40+ miles north of my house (I'll build a yagi some day and see which one preforms best). Solder the two pieces of copper wire to form the Bi-quad?s radiating structure as illustrated in the image below. Step 2: Measure and cut the ground plane. Step 3: Cut a copper spacer with a length of 30.6mm and inner diameter of > 5.5 mm. This is only to support the Bi-quad copper wire and feed? The most important requirement is that the coaxial cable needs to fit through the middle – varying the thickness by a couple of millimeters should not greatly affect the antenna?s performance. I used a copper pipe with 7.8mm outer diameter and 5.7mm inner diameter which I got from a refrigerator repair shop for R 30/meter (. Bi-Quad components Step 4: Solder the copper pipe to the ground plane. Note that both pieces should be sanded to have rough surfaces and preheated in order for the solder to take easily. This can be quite tricky as the copper is a good heat conductor and cools down very quickly. ![]() (We used two soldering irons? One standing upright through the middle of the ground plane with the piece of copper on top over the solder point. This ensured constant heat to both objects and the other solder was used on the outside to apply the soldering agent.) Here is the result. S11 Measurement vs Simulation The measurement shows that the antenna is well matched over the desired band (- 20 dBi) but has an?unwanted ripple on the S11 measurement. I only realised the cable and connector that I got from an old Wi-Fi antenna (also designed for 50 ohm) actually uses a 75 ohm cable which caused unwanted reflections between the connector and the radiating copper wire. I ordered a new cable and will update the post as soon as I replaced the old with the new cable.? I hope this blog entry will be useful for those of you wanting to improve your Wi-Fi reception at home! Author: This entry was posted on Tuesday, December 8th, 2009 at 10:21 am and is filed under. You can follow any responses to this entry through the feed. You can, or from your own site. 12 Responses to “Making your own Bi-Quad (Wi-Fi) antenna”.
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