ANT-DB1-WRT-MON-ccc
Data Sheet
Product Description
The dual-band WRT-MON Series antenna supports
legacy 2.4GHz WiFi and newer 5.8GHz band
applications in a single, compact antenna. The
WRT-MON’s low profile and tamper resistant
design is perfect for challenging applications such
as wireless vending, security, traffic, and power
equipment. The antenna is installed through a
small hole in the enclosure and has an integrated
closed-cell PSA ring to seal against the enclosure,
protecting critical equipment from harsh, external
elements. The WRT-MON Series antenna is
optimized for applications with conductive
enclosures, using the enclosure as the counterpoise
and eliminating the need for an additional ground
plane inside the product.
The WRT-MON Series antenna has a 216.0 mm
(8.5”) long coax cable with an RP-SMA, SMA or
U.FL/MHF-compatible connector as standard
options. It is easily customized with different cable
lengths and connectors for volume orders. Contact
Linx for details.
Ø19.0mm
(0.75")
by
27.0 mm
(1.06")
Remove protective
plastic before installation
Adhesive Ring
8.5 mm
(0.34")
10.3 mm
(0.41")
7/16-28
UNEF-2A
Thread
SMA or
RP-SMA
or
U.FL
i-PEX silouette
shown in shadow
Cable Length
216.0 mm
(8.50")
Features
•
•
•
•
Compact
Tamper resistant
Low cost
Indoor / outdoor
Electrical Specifications
Center Frequency:
Recom. Freq. Range:
Bandwidth:
Wavelength:
VSWR:
Peak Gain:
Impedance:
Max. Power:
Connector:
Cable:
Oper. Temp. Range:
Max. Recom. Torque:
Band 1: 2.45GHz
Band 2: 5.8GHz
Band 1: 2.40–2.50GHz
Band 2: 5.725–5.875GHz
Band 1: 100MHz
Band 2: 150MHz
¼-wave
< 2.0 typical at center
Band 1: 1.0dBi max
Band 2: 2.8dBi max
50-ohms
5W
RP-SMA, SMA or U.FL / MHF
RG-174, RP-SMA & SMA
1.32 mm U.FL
–40°C to +85°C
4.0 kgf-cm
Ordering Information
ANT-DB1-WRT-MON-RPS (with RP-SMA connector)
ANT-DB1-WRT-MON-SMA (with SMA connector)
ANT-DB1-WRT-MON-UFL (with U.FL / MHF
compatible connector)
Electrical specifications and plots measured on 10.16 cm x 10.16 cm
(4.00” x 4.00”) reference ground plane
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Revised 12/6/2017
Counterpoise
Quarter-wave or monopole antennas require an associated ground plane counterpoise for proper operation.
The size and location of the ground plane relative to the antenna will affect the overall performance of the
antenna in the final design. When used in conjunction with a ground plane smaller than that used to tune the
antenna, the center frequency typically will shift higher in frequency and the bandwidth will decrease. The
proximity of other circuit elements and packaging near the antenna will also affect the final performance. For
further discussion and guidance on the importance of the ground plane counterpoise, please refer to Linx
Application Note AN-00501: Understanding Antenna Specifications and Operation.
VSWR Graph
VSWR
3:1
1.5392
1.2395
Reflected Power
25%
2:1
11%
1:1
CENTER 2450MHz
CENTER 5800MHz
0%
SPAN 200MHz
What is VSWR?
The Voltage Standing Wave Ratio (VSWR) is a measurement of how well an antenna is matched to a source
impedance, typically 50-ohms. It is calculated by measuring the voltage wave that is headed toward the load
versus the voltage wave that is reflected back from the load. A perfect match has a VSWR of 1:1. The higher
the first number, the worse the match, and the more inefficient the system. Since a perfect match cannot
ever be obtained, some benchmark for performance needs to be set. In the case of antenna VSWR, this
is usually 2:1. At this point, 88.9% of the energy sent to the antenna by the transmitter is radiated into free
space and 11.1% is either reflected back into the source or lost as heat on the structure of the antenna. In
the other direction, 88.9% of the energy recovered by the antenna is transferred into the receiver. As a side
note, since the “:1” is always implied, many data sheets will remove it and just display the first number.
How to Read a VSWR Graph
VSWR is usually displayed graphically versus frequency. The lowest point on the graph is the antenna’s
operational center frequency. In most cases, this is different than the designed center frequency due to
fabrication tolerances. The VSWR at that point denotes how close to 50-ohms the antenna gets. Linx
specifies the recommended bandwidth as the range where the typical antenna VSWR is less than 2:1.
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ANT-2.4-WRT-MON-ccc Data Sheet
by
Gain Plots
2450MHz
350
340
330
320
0
E / Vertical Gain
H / Horizontal Gain
Total Gain
5.00
0.00
-5.00
-10.00
10
20
30
40
320
330
340
350
0
5.00
0.00
-5.00
-10.00
10
20
30
40
350
340
330
320
0
5.00
0.00
-5.00
-10.00
10
20
30
40
310
-15.00
-20.00
-25.00
50
310
-15.00
-20.00
-25.00
50
310
-15.00
-20.00
-25.00
50
300
60
300
60
300
60
290
-30.00
-35.00
70
290
-30.00
-35.00
70
290
-30.00
-35.00
70
280
-40.00
-45.00
80
280
-40.00
-45.00
80
280
-40.00
-45.00
80
270
-50.00
90
270
-50.00
90
270
-50.00
90
260
100
260
100
260
100
250
110
250
110
250
110
240
120
240
120
240
120
230
130
230
130
230
130
220
210
200
190
180
170
160
150
140
220
210
200
190
180
170
160
150
140
220
210
200
190
180
170
160
150
140
XZ-Plane Gain
YZ-Plane Gain
XY-Plane Gain
5800MHz
350
340
330
320
0
5.00
0.00
-5.00
-10.00
10
20
30
40
320
330
340
350
0
5.00
0.00
-5.00
-10.00
10
20
30
40
350
340
330
320
0
5.00
0.00
-5.00
-10.00
10
20
30
40
310
-15.00
-20.00
-25.00
50
310
-15.00
-20.00
-25.00
50
310
-15.00
-20.00
-25.00
50
300
60
300
60
300
60
290
-30.00
-35.00
70
290
-30.00
-35.00
70
290
-30.00
-35.00
70
280
-40.00
-45.00
80
280
-40.00
-45.00
80
280
-40.00
-45.00
80
270
-50.00
90
270
-50.00
90
270
-50.00
90
260
100
260
100
260
100
250
110
250
110
250
110
240
120
240
120
240
120
230
130
230
130
230
130
220
210
200
190
180
170
160
150
140
220
210
200
190
180
170
160
150
140
220
210
200
190
180
170
160
150
140
XZ-Plane Gain
Z
YZ-Plane Gain
Z
XY-Plane Gain
Z
Y
Y
Y
X
X
X
XZ-Plane Gain
YZ-Plane Gain
XY-Plane Gain
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ANT-2.4-WRT-MON-ccc Data Sheet
by
About Gain Plots
The true measure of the effectiveness of an antenna in any given application is determined by the gain
and radiation pattern measurement. For antennas gain is typically measured relative to a perfect (isotropic)
radiator having the same source power as the antenna under test, the units of gain in this case will be
decibels isotropic (dBi). The radiation pattern is a graphical representation of signal strength measured at
fixed distance from the antenna.
Gain when applied to antennas is a measure of how the antenna radiates and focuses energy into free
space. Much like a flashlight focuses light from a bulb in a specific direction, antennas focus RF energy into
specific directions. Gain in this sense refers to an increase in energy in one direction over others.
It should also be understood that gain is not “free”, gain above 0dBi in one
direction means that there must be less gain in another direction. Pictorially
this can be pictured as shown in the figures to the right. The orange pattern
represents the radiation pattern for a perfect dipole antenna, which is shaped
like a donut. The pattern for an omnidirectional antenna with gain is shown in
blue. The gain antenna is able to work with a device located further from the
center along the axis of the pattern, but not with devices closer to the
center when they are off the axis – the donut has been squished.
Gain is also related to the overall physical size of the antenna, as well as
surrounding materials. As the geometry of the antenna is reduced below the effective wavelength (considered
an electrically small antenna) the gain decreases. Also, the relative distance between an electrically small
antenna and its associated ground impacts antenna gain.
Copyright © 2017 Linx Technologies
159 Ort Lane, Merlin, OR 97532
Phone: +1 541 471 6256
Fax: +1 541 471 6251
www.linxtechnologies.com
–4
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Mouser Electronics
Authorized Distributor
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