Whether the wireless network adapter, wireless AP or the wireless router, built-in wireless antenna. Therefore, when the distance is close, users do not need to install an external wireless antenna. However, when the distance exceeds 20~30 metres of indoor and outdoor transmission distance exceeds 50~100 metres, it is necessary to consider installing an external antenna for the wireless AP or the wireless network adapter in order to enhance the wireless signal strength, extends coverage for your wireless network.
More varieties of wireless communication antennas in XI ' an, in order to meet the requirements of different frequencies for different purposes and different occasions,therefore, when purchasing antenna, it should be noted the following factors:
At present, the available wireless networks there are 3 main criteria, namely, IEEE 802.11b, IEEE 802.11g and IEEE 802.11A. Among them, IEEE 802.11b, IEEE 802.11g working 2.4GHz and IEEE 802.11A working 5GHz. Wireless products should be used with the implementation of the standards corresponding to the wireless antenna.
When long distance communication is needed, some wireless AP and the wireless router's antennas are in the Interior, while others are located in an outdoor, therefore, should choose indoor antenna or an outdoor antenna suitable for different environments. Need to be aware of is that indoor antenna no waterproof and mine, so, indoor antennas must not be used outdoors.
When the need for long-distance data transmission, should choose the big gain of the antenna, and for proximity wireless network, you can select a small antenna. Typically, large antenna suitable for long-distance transmission, while the small-gain antenna is suitable for network roaming and other applications that require large coverage. Gain uses dBi indoor antenna are 4~5dBi, outdoor antennas are mostly 8.5~14dBi.
Directional antenna directivity is very strong, can focus the signal send to or receivefrom one direction in one direction. Omni-directional antennas can be Omni-directional send or receive radio signals can cover a very wide range of areas, but every direction signal is weak. So, typically, Omni-directional antenna should I choose the wireless AP and the wireless router, and wireless network card you can use a directional antenna.
For a peer network, wireless network adapter should be used in all Omni-directionalantenna. If only two wireless network card wireless network, then, naturally, shouldall be using directional antennas.
Networks for the access point, wireless AP or wireless router required for wireless network in the wireless network adapter provides wireless connectivity and, therefore,should choose a Omni-directional antenna. And as the wireless card, only need to communicate with a wireless AP or wireless router, so a directional antenna should Ichoose.
Although some indoor antennas can be installed on a desktop or mounted on a wall. However, some products are only suitable for desktop. Should therefore be based on the location of your wireless AP or wireless router installation, determine the appropriate type of indoor antenna.
Although wireless products follow the same standards, however, use different products tend to have a different interface, different cables, so different brands of wirelessantennas are often not generic.