Wireless
Wireless
Accessories
44 | Wireless
WALL-MOUNT COAX CABLES
SUBCATEGORY FEATURE AT-WR4501 AT-TQ0001 AT-TQ0003 AT-TQ0041 AT-TQ0045
ENVIRONMENTAL In/outdoor usage Outdoor Outdoor Outdoor Outdoor Outdoor
ANTENNA / CABLE TYPE HDF200 HDF200 HDF400 HDF400
ANTENNA GAIN
(dBi)
@ 2.4GHz
@ 5GHz
INSERTION LOSS
(dB)
@ 2.4GHz -0.5 -1.7 -0.3 -1.2
@ 5GHz -0.7 -2.7 -0.5 -2.1
CONNECTOR
1 x N plug
1 x RP-SMA plug
1 x N plug
1 x RP-SMA plug
2 x N plug 2 x N plug
COMPATIBLE
EQUIPMENT
AT-WR4541a / AT-WR4541g
■ ■
AT-WR4542
AT-WR4561 / AT-WR4562
■ ■ ■
AT-TQ2403
■ ■
DIMENSIONS
(W x D x H) / Length
18.9 x 8.9 x 3.7cm
7.4 x 3.5 x 1.5in
.5m
1ft 7.7in
3m
9ft 10in
.5m
1ft 7.7in
5m
16ft 4.9in
Weight .48kg / 1.06lbs .10kg / .22lbs .20kg / .44lbs .12kg / .26lbs .6kg / 1.32lbs
IDEAL ENVIRONMENT » WISP, enterprise » WISP, enterprise » WISP, enterprise » WISP, enterprise » WISP, enterprise
CUSTOMER’S NEEDS » Wall-mount
» Higher gain or
directional antenna
» Higher gain or
directional antenna
» External antenna » External antenna
Gain
Loss
WISP
The only reason for designing and using special antennas is to modify the ‘radiation pattern’. Infact, an antenna works as a lens or a parabolic
reflector concentrating the radiated power into a narrow beam and enhancing the received signals like a telescope. Therefore, the Gain
expresses how much the antenna enhances the transmitted and received signals relative to simple radiators like
a dipole or a dot shaped one,
called ‘isotropic’. In the first case the antenna gain is expressed in dBd (decibels over dipole) while in the latter it is expressed in dBi (decibels
over isotropic).
Since a dipole’s gain is 2.15 dBi and dB are logarithmic quantities, the antenna gain in dBi is equal to the gain in dBd plus 2.15.
The attenuation of the cable or device. In dB.
Wireless Internet Service P
rovider.
Glossary
Using high gain antennas is not always a good
idea!
Antennas have on electromagnetic waves the same effect that
lenses have on light.
A high gain antenna does not increase the radiated power but
simply concentrates the power fed by the transmitter in a
certain area and ‘magnifies’ the received signal from the same
area. Therefore choosing the right antenna is very important
and largely
affe
cts the performances of every wireless network.
The various antenna types differ from each other in their
footprint shape. Increasing the gain has the effect of reducing
their footprint size.
An Omni-directional antenna concentrates the signal in a 360°
belt around it. The higher the gain the thinner the belt is. The
result is a better signal far from the antenna and a signal so low
below the anten
na t
hat it can be impossible to communicate.
Panel and Parabolic antennas have a nearly circular footprint.
Low gain panels can be used for both short distance point-to-
point and point-to-multipoint links but can be successfully used
for straight roads coverage too. High gain Panel and Parabolic
antennas produce such a small spot that can be deployed only
in medium to long distance point-to-point links
.
A
Sector antenna footprint is a horizontal ellipse whose width
is usually 30°, 60°, 90° or 120°, therefore higher gain sector
antennas have a vertically thinner footprint while keeping the
same horizontal width. This allows for using Sector antennas in
the central site of a point-to-multipoint link or for coverage of
a certain ‘sector’ in mobile networks.
Choosing the right antenna is like choosing th
e b
est lighting
system between various types of streetlamps and lighthouses.
You will never choose the latter for lighting a yard.
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