7/4/2021 0 Comments Buat Antena Omni Wifi
This omni directional antenna, nicknamed the Spider Omni, was built in response to finding a simple diagram in an old book.After scaling to the correct frequency, it was built to help augment an 802.11b vehicle-based community wireless network effectively and cheaply.It was built using an N-type chassis mount connector with short lengths of stiff fencing wire soldered into each corner hole.
The driven element (the wire soldered into the centre, or conductor) was a quarter wavelength (32 millimetres) as was each ground plane (four soldered around the body of the connector). Each groundplane was cut to length and then bent over at 30 degrees below the horizontal to attempt to match the impedance to 50 Ohms. From experience of useage in a variety of situations and surroundings, I would estimate the gain of this antenna to be around a 3 dB improvement over a Buffalo pcmcia card internal antenna, with a much smoother polar coverage (allowing for the losses in a pigtail, and 6 or 7 metres of URM67 cable, and connectors). In use on a flat field, using two of these antennae attached to pcmcia 802.11b cards via cable and pigtails, we were able to maintain an 11Mbs network at between 400 to 500 metres with clear line of sight. You may be able to tell from the lack of absolute measurments in my results that I do not have access to calibrated test equipment, or the time to carry out well documented tests. If anybody does, please let me know the results Article by Dave Gough at Go to the above webpage for full details. Daniel Pebrianto View more Bahasa English Franais Espaol Deutsch Portuguese Indonesian Italian Romanian Malaysian Greek Dutch Polish Halaman Kategori Tentang kami Hubungi kami Hukum Ketentuan penggunaan DMCA Kebijakan Cookie Copyright 2018 FDOKUMEN. Once registered and logged in, you will be able to contribute to this site by submitting your own content or replying to existing content. Buat Antena Omni Wifi Plus Much MoreYoull be able to customize your profile, receive reputation points as a reward for submitting content, while also communicating with other members via your own private inbox, plus much more This message will be removed once you have signed in. ![]() ![]() Theoretically, when stacking idealised lossless dipole antennas in such a fashion, doubling their number will produce double the gain, with an increase of 3.01 dB. In practice, the gain realized will be below this due to imperfect radiation spread and losses.
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