Biquad Antenna Construction. Biquad Antenna Construction. September 2. 00. 2. This page details the construction of a biquad antenna. The biquad antenna. GHz Wifi antennas collected in AntennasWiFi at The DXZone. Double Biquad Wifi Dish' title='Double Biquad Wifi Dish' />All WiFi users are constantly wanting more powerful signals. In this instructable we demonstrate how to build a simple but power double biquad WiFi antenna. Par. How to increase your routers WiFi signal using high power antennas 2. Ghz5Ghz Duration 720. SimpleWiFi 111,745 views. Low sidelobe 802. BiQuad feed for Primestar dish. The Primestar dishes are high gain, low cost, parabolic reflectors with an offset feed. They have superior. September 2002 This page details the construction of a biquad antenna. The biquad antenna is easy to build, and provides a reliable 11dBi gain, with. Release Notes Release date 28 August 2017 New or improved functionality. New Antennas. Ultra wideband folded sphericalhelix monopole with a cone. Bi gain, with a fairly wide beamwidth. Backgroundcompleted biquad antenna. Ive done quite a bit of experimentation and testing with various. Bi Conifer dishes. Trevor Marshall has a. Primestar satellite dish, with very good. I decided to try using a biquad as a feed on a 2. Bi Conifer dish. to see if I could improve the performance of it of the dish. Note that the photos on Trevor Marshalls. Numerous people including myself. Use the photos of my biquad below, and refer to the websites listed in the. Parts Required. I used the following bits and pieces. PCB. 5. 0mm length of 12 copper pipe. CNT 4. 00 or LMR 4. Note that you dont have to use blank PCB for the reflector. You can use any material. Ive also heard of people using CDROM as the reflector, as the foil on it will certainly. Reflector. Cut a square piece of blank printed circuit board, 1. Note that Trevor Marshall. He also recommends attaching some lips to two sides of the reflector, to. Use some steel wool to remove any tarnish and polish it up. Cleaning the copper in this way will make it easier to solder. Infinity Alpha 50 Speakers Manual. Cut a 5. 0mm section of copper pipe, and file both ends smooth. Using some sandpaper andor some files, polish up the copper pipe. Cut a notch into one end of the copper pipe, removing approx 2mm from. Drill a hole in the centre of the blank PCB so that the copper pipe. I found a reamer to be very useful for. Insert the copper pipe into the hole, with the notched end on the copper. PCB. The copper pipe should be protruding approx 1. PCB. insert the copper pipe into the reflector. Solder the copper pipe to the PCB, to ensure a good physical and electrical. PCBQuite a bit of heat is needed, due to the thickness of the. Sonalksis G Mac. I found a small gas torch works quite well. Making the Element. The element is made from a length of copper wire, bent into the appropriate shape. Note that the length of each side should be as close to 3. GHz. the shape and dimensions of the element. I had some offcuts of electrical power cable lying around, and found that 2. Trevor Marshall. specifies, but didnt think it would make a significant difference to the performance. Remove the insulation, measure and cut a 2. Measure the mid point of the wire, and make a 9. The bend should be. Measure the midpoints of each half, and make two more 9. Once again, measure the midpoints of each section, and make some more 9. Do the same to the other side, resulting in the biquad shape. Clean up all your bends, and ensure each side of the element is as straight as possible. Note that you may need to trim a small amount off each end of the wire to achieve this. Assembly. The element must now be attached to the reflector. Note that only the. The copper wire element should be approximately 1. Testing antenna performance while varying the spacing between the copper wire element. SWR. test results available here. Strip approx 3. 0mm of the outer sheath from the end of the coax. Fold the braid back over the outer sheath, and trim the centre conductor. Insert the braid into the copper pipe, so that the end of the centre conductor. Refer to some of the additional photos below for details. Note that the feed between the rear reflector and the biquad element. Using coax to feed the biquad element directly. Use of bare conductors as a feed between the reflector and biquad element. I used a coax crimper to crimp the end of the copper pipe onto the coax. This ensures that the coax would not move inside the copper pipe. Now terminate the other end of the coax with an N connector. If desired, you can add spacers at each end of the element, to ensure. Refer to my double biquad page for more details. If you intend to mount the biquad outside, Id recommend you place it into a. Numerous people have used small tuppaware containers. This can be achieved by drilling a hole in one side of the container. Seal up the hole for the coax with some silicone, and your. Testing. Some very rough initial testing using the biquad as a feed on a 2. Bi Conifer. dish looks very promising, with the signal strength being at least as as good. Conifer dipole I was holding. Conifer dipole. I also managed to get a marginal link to a 1. W Roam. About wireless card. Some more detailed testing with multiple antennas. Bi. A friend has access to some antenna test equipment, and performed some tests. The azimuth plot ie, radiation pattern of the biquad is shown below. B beamwidth of about 5. Usage. For information on connecting a biquad antenna to a wireless radio, have a look at the page on. When using a biquad to establish a link to another wireless device, you. Similarily, if establishing a link with two biquads. Failing to match the polarisation will result in significant signal loss. Changing the polarisation is just a matter of rotating the entire biquad antenna by. The biquad antenna is not particularly directional, but has a fairly wide beamwidth. The 3d. B beamwidth for a biquad without side lips is typically about 4. The relatively wide beamwidth also makes a biquad very suitable for war driving. While a directional antenna, such as a Conifer dish. B beamwidth of a 2. Bi Conifer dish is approx 7 degrees, is better suited. Conifer dish requires more. An antenna with a wider beamwidth, such as a biquad, doesnt require the same. Variations. A number of people have suggested the spacing between the element and the rear. However, test results. SWR of the biquad is minimised when the spacing is about 1. Increasing the spacing to 3. SWR significantly, thus reducing the. Need More Gain For a higher gain variation of the biquad thats virtually just as easy to build. The double biquad has approx 1. Bi gain. Remember that the d. Bi scale is logarithmic, where 3 d. Bi is a doubling in gain. An increase in gain of 2 d. Bi is equivalent to an increase of 6. Kits. If youre one of those people who may not have all the tools required for building a biquad. DIY kit containing all components from. War. Driving. World. In November 2. 00. War. Driving. World sent me one of their DIY biquad kits to review. The kit contains all the pre cut and pre drilled parts required to build a biquad antenna. For more infomation on this kit, including antenna comparision test results, read my. War. Driving. World DIY Biquad Kit. Biquad and double biquad antennas, as well as DIY kits for building your own antennas are also available from. References. Trevor Marshalls Bi. Quad 8. 02. 1. 1b Antenna. Double Biquad Antennalast updated 2.