ANT-2.4-WRT-MON-xxx
Data Sheet
Product Description
The WRT-MON Series monopole antenna is
compact and tamper-resistant. It’s great for
applications like wireless vending machines, traffic
equipment and power equipment where space is
limited and security is important.
Unlike the WRT Series dipole antenna, the
WRT-MON Series monopole antenna requires
a proximity ground plane, which dramatically
reduces the space required inside the product.
The antenna is designed to be installed onto a
conductive surface with the metal base and nut
electrically connected to the surface serving as the
counterpoise. The antenna installs through a small
hole on the product and is anchored by a threaded
metal base connected to the coax cable shield.
An adhesive foam compression ring resists the
elements.
The WRT-MON Series antenna is available in
2.45GHz. It’s attached to a 216.0 mm (8.5")
long coax cable with an RP-SMA, SMA or U.FL/
MHF-compatible connector on the other end. The
RP-SMA and SMA connectors use an RG-174
coax. The U.FL/MHF connector uses a 1.32 mm
micro-coax. More connectors, colors and coax
length options are available for OEM customers.
19.0 mm
(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")
Electrical Specifications
Center Frequency:
Recom. Freq. Range:
Wavelength:
VSWR:
Peak Gain:
Impedance:
Connector:
Cable:
Oper. Temp. Range:
Max. Recom. Torque:
2.45GHz
2.4–2.5GHz
¼-wave
≤
1.9 typical at center
0.8dBi
50-ohms
RP-SMA, SMA or U.FL / MHF
RG-174, RP-SMA & SMA
1.32 mm U.FL
–30°C to +80°C
4.0 kgf-cm
Features
•
•
•
•
Compact
Tamper resistant
Low cost
Indoor / outdoor
Ordering Information
ANT-2.4-WRT-MON-RPS (with RP-SMA connector)
ANT-2.4-WRT-MON-SMA (with SMA connector)
ANT-2.4-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
–
1
–
Revised 2/16/15
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
1.543
Reflected Power
25%
2:1
11%
1:1
2350MHz
2450MHz
0%
2550MHz
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 will have 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 will be 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.
–
2
–
Data Sheet ANT-2.4-WRT-MON-xxx
by
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