Archive for category Antennas

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Selecting the right antenna will save a lot of heartaches down the road

Dual-polarity parabolic antenna

In broadband wireless, there are many types of antennas available to suit the requirements of the application. The primary aspect of antenna selection is usually gain. But equally important criteria include such things as beamwidth, side and rear lobe rejection, cross-polarity isolation, and VSWR (voltage standing wave ratio dud). Antennas also come in single and dual-polarity models. The newer dual-polarity antennas are used in MIMO (multiple-input–multiple output) technology where there are actually two transceivers in each radio–one connected to the vertical polarity of the antenna, the other to the horizontal polarity. Click here for a short primer on antennas courtesy of KBT Communications, Inc. By transmitting and receiving using two radios on the same frequency–just on opposite polarities, MIMO wireless devices can actually achieve twice the throughput compared to a single radio of the same channel bandwidth. Read the rest of this entry »