ANT-868-CW-HWR-xxx
Data Sheet
Product Description
HWR Series ½-wave center-fed dipole antennas
deliver outstanding performance in a rugged and
cosmetically attractive package. The articulating
base allows the antenna to tilt 90 degrees and
rotate 360 degrees. The antenna’s internal
counterpoise eliminates external ground
plane dependence and maximizes performance.
HWR Series antennas attach via a standard SMA
or Part 15 compliant RP-SMA connector. Custom
colors and connectors are available for volume
OEM customers.
8.2 mm
(0.32")
by
Features
Internal counterpoise
Low cost
Tilts and rotates
Omni-directional pattern
Outstanding VSWR
Rugged & damage-resistant
Standard SMA or Part 15 compliant RP-SMA
connector
•
Custom colors and terminations for volume
OEMs
•
Internal O-ring seal on connector connector
•
•
•
•
•
•
•
142 mm
(5.59")
116 mm
(4.57")
End View
26 mm
(1.02")
Electrical Specifications
Center Frequency:
Recmd. Freq. Range:
Wavelength:
VSWR:
Peak Gain:
Impedance:
Connection:
Oper. Temp. Range:
868MHz
853–883MHz
½-wave
≤
2.0 typical at center
–2.3dBi
50-ohms
RP-SMA or SMA
–30°C to +80°C
10 mm
(0.39")
Electrical specifications and plots measured with a 10.16 cm x
10.16 cm (4.00” x 4.00”) reference ground plane
Ordering Information
ANT-868-CW-HWR-RPS (with RP-SMA connector)
ANT-868-CW-HWR-SMA (with SMA connector)
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1
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Revised 10/31/13
VSWR Graph
VSWR
3:1
1.125
Reflected Power
25%
2:1
11%
1:1
768MHz
0%
868MHz
968MHz
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.
159 Ort Lane, Merlin, OR, US 97532
Phone: +1 541 471 6256
Fax: +1 541 471 6251
www.linxtechnologies.com
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2
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Data Sheet ANT-868-CW-HWR-xxx
by
MCU
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