ANT-2.4-WRT-xxx
Data Sheet
Product Description
The WRT Series antenna is ideally suited for
applications such as wireless vending, security,
traffic, or power equipment which require an
unobtrusive, tamper-resistant antenna solution.
The tiny 19 x 11 mm radome installs through a
small hole on the product and is anchored by a
threaded base. An adhesive foam compression ring
is used to resist the elements. The ½-wave antenna
also features an integral counterpoise, which
eliminates the need for a proximity ground plane.
The antenna is suited for mounting in applications
where the counterpoise will not be shielded
from the antenna (non-conductive or open metal
enclosures); installation where the counterpoise is
within a shielded enclosure will affect the antenna
performance. The antenna’s coax feed is available
with SMA, RP-SMA, or a U.FL / MHF compatible
connector. U.FL and I-PEX MHF connector
standards are compatible with each other. Alternate
coax lengths, connectors and custom colors are
available for volume OEM customers.
19.0 mm
(0.75")
by
11.0 mm
(0.43")
6.0 mm
(0.24")
Remove protective plastic
before installation
Adhesive Ring
SMA or
or
RP-SMA
M11x1.0 mm
Thread
U.FL
i-PEX silouette
shown in
shadow
32.5 mm
(1.28")
Counterpoise
5.26 mm
(0.207")
Cable Length
216.0 mm
(8.50")
Ordering Information
Features
•
•
•
•
•
•
Low cost
Unobtrusive
Tamper resistant
Integral counterpoise
Indoor / outdoor
Adhesive or permanent mount
ANT-2.4-WRT-RPS (with RP-SMA connector)
ANT-2.4-WRT-SMA (with SMA connector)
ANT-2.4-WRT-UFL (with U.FL / MHF compatible connector)
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
½-wave
≤
1.9 typical at center
3.5dBi
50-ohms
RP-SMA, SMA or U.FL / MHF
RG-174, RP-SMA & SMA
1.32 mm U.FL
–40°C to +90°C
4.0 kgf-cm
Electrical specifications and plots measured on 10.16 cm x
10.16 cm (4.00" x 4.00”) reference ground plane
–
1
–
Revised 12/9/13
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-xxx
by
Microchip MCU
