WokFi
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WokFi (a portmanteau derived from blending the words Wok + Wi-Fi) is a slang term for a style of homemade Wi-Fi antenna consisting of a crude parabolic antenna made with a low-cost Asian kitchen wok, spider skimmer or similar household metallic dish. The dish forms a directional antenna which is pointed at the wireless access point antenna, allowing reception of the wireless signal at greater distances than standard omnidirectional Wi-Fi antennas.[1]
Description
WokFi antennas are fabricated out of commonly available concave metal kitchen dishes or dish covers (which need not be perfectly parabolic); Asian woks are favored because they have shapes closest to parabolic. A commercial Wi-Fi antenna, usually a USB Wi-Fi dongle, is suspended in front of the dish, attached by cable to the computer.
The WokFi antenna is considered simpler and cheaper than other home-built antenna projects (such as the popular cantenna), but is a very effective method to boost the Wi-Fi connection quality, audit access point coverage, and even quickly establish WLAN viability – perhaps if a more professional setup is eventually intended.
Advantages
A significant advantage is that with a USB modem the RF signal is converted to a conventional digital signal at the antenna. Therefore, by using standard USB extension cables, the antenna can be located at a distance from the computer of five meters or more, with no concerns over microwave signal losses that would occur in an RF coaxial cable feedline of that length used to attach a conventional antenna to the RF input of a computer modem. Chaining active USB repeaters, it is possible to locate the antenna at much greater distances from the computer, which is especially useful when line-of-sight (LOS) obstacles (such as vegetation and walls) require the antenna to be located on a roof, for example. If using mesh reflectors, usually with a grid under 5 mm, the antenna will be lighter and present a smaller wind-load than larger dishes.
Performance
WokFi gains are typically 10+ dB,[2] with range boosts, thus can be 16-32 times over the antenna of a bare USB adapter. Ranges (LoS) are typically Script error: No such module "convert".,[3] although an aligned pair of similar point-to-point transceiver setups may approach Script error: No such module "convert". over a clear path. In addition, certain improved WokFi antennas, and antennas made using Script error: No such module "convert". diameter round or oval satellite TV dishes, allow even far greater range, up to Script error: No such module "convert"..[4]
Interference from nearby 2.4 GHz signals (perhaps from cordless phones, AV links, leaky microwave ovens, other APs or Bluetooth) can be nulled out—a useful feature in this increasingly crowded part of the RF spectrum. The performance of abundant, low-powered Wi-Fi "dongles", typically selling for approximately US$15–20, but of only 30–40 mW transmitter power and modest receiver sensitivity, can easily be boosted with little more than cheap cookware or pot lids. The "sweet spot" on such ad hoc reflectors can readily be found by taping a small (~2.5 cm, or 1 in) mirror on the surface of the dish, to see where the sun's rays focus.
See also
References
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External links
- USB adaptors & DIY antenna = "Poor Man's WiFi" ? — Kiwi Stan Swan's site, where the whole WokFi thing sparked