ProSoft RadioLinx RLXIB-IESC User Manual page 86

RLXIB-IESC ♦ 802.11a, b, g
RadioLinx® Industrial 802.11abg Serial and Ethernet Client
6.3.4 Whip antennas
You can use a 1/2 wave straight whip or 1/2 wave articulating whip (2 dBi)
antenna with RLXIB-IESC radios. These antennas are the most common type in
use today. Such antennas are approximately 5 inches long, and are likely to be
connected to a client radio (connected directly to the radio enclosure). These
antennas do not require a ground plane. Articulating antennas and non-
articulating antennas work in the same way. An articulating antenna bends at the
connection.
6.3.5 Collinear array antennas
A collinear array antenna is typically composed of several linear antennas
stacked on top of each other. The more stacked elements it has, the longer it is,
and the more gain it has. It is fed in on one end.
The antenna pattern is torroidal. Its azimuthal beamwidth is 360°
(omnidirectional). Its vertical beamwidth depends on the number of
elements/length, where more elements equal narrower beamwidth. The antenna
gain also depends on the number of elements/length, where more elements
produce higher gain. Typical gain is 5 to 10 dBi.
The antenna polarity is linear, or parallel to the length of the antenna.
Page 86 of 98
Reference
User Manual
ProSoft Technology, Inc.
May 25, 2010