Very Cheap Ez-12 D.I.Y. Parabolic Reflector
WiFi gain for Router, AP and USB WiFi dongle *

1. Open the template (Windsurfer.jpg) in MS Paint or something like that and resize if desired. Ensure that you keep the square on the diagram square. 2. Print image on business card stock or acetate (document protector). 3. Cut it out and open the six slots of the reflector with scissors or a hobby- or break-knife. If the used paper is too thin, make a ‘copy’ of it on thicker cardboard. 4. Glue tin foil to the back side of the reflector surface. When using also a copy on thicker cardboard, glue the tin foil on the copy of the reflector and than glue them together and glue also the copies of the holder together. Use a good kind of glue like Bisonkit transparant. 5. Cut the crosses in the holder with a hobby- or break-knife. 6. Assemble by placing the six tabs of the holder in the six slots of the reflector. Fold the tabs after placing and fix them with glue. 7. Place the assembly on the WiFi antenna and aim the reflector in the direction of the ‘target’ (to WiFi dongle, Router or AP) to get maximum performance.

Tell a friend about this idea. Note: If printed at the download size you will see about 6-9 dBi of gain. If you double the size of the image before you print it you will see about 9-12 dBi of gain. If you place two reflectors on an AP or router with two antennas you will see an additional increase in performance. * Types without external antennas can’t be improved this way, but a USB WiFi dongle with external antenna can! Een mathematical example: http://www.ies.co.jp/math/java/conics/focus/focus.html See also the video on YouTube: http://www.youtube.com/watch?v=sUTT8wdN_VA

Six inch reflector pattern at 2.4 GHz