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Wireless Networking Radio Frequency Properties
By admin | January 30, 2008
An RF signal’s polarity is independent of its amplitude. Stations must use the same frequency to communicate. For example, OFDM (802.11a) (5 GHz) and HR-DSSS (802.11b) devices (2.4 GHz) operate at different frequencies, and cannot communicate with each other. A wireless station on channel 6 cannot communicate directly to another station on channel 11. Antennas are most receptive to signals that have a wavelength equal to the length of the antenna’s element. Antenna elements of 1/2 & 1/4 are the next best options. Signals in phase will result in a stronger signal, while those 180 degrees out of phase will cancel each other out. The most effective communication will occur when both antenna are either in horizontal polarization or vertical polarization. However, even if two antennas are not in polarization with each other, they will still likely receive a signal’s reflection.
Topics: WIRELESS NINJA |
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