ANT-916-CW-HW
Data Sheet
Product Description
HW Series ½-wave center-fed dipole antennas
deliver outstanding performance in a rugged
and cosmetically attractive package. The
antenna contains a helical element and internal
counterpoise which eliminates external ground
plane dependence and maximizes performance.
HW Series antennas attach via a standard SMA
or Part 15 compliant RP-SMA connector. Custom
colors and connectors are available for volume
OEM customers.
8.1 mm
(0.32")
by
Features
•
•
•
•
•
•
•
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Low cost
Internal counterpose
Bandwidth covers entire ISM 900MHz band
Excellent performance
Omni-directional pattern
Outstanding VSWR
Rugged & damage-resistant
Standard SMA or Part 15 compliant RP-SMA
connector
•
Internal O-ring seal on connector
120.0 mm
(4.72")
10.7 mm
(0.42")
End View
Electrical Specifications
Center Frequency:
Recmd. Freq. Range:
Wavelength:
VSWR:
Peak Gain:
Impedance:
Connection:
Oper. Temp. Range:
916MHz
900–930MHz
½-wave
≤
2.0 typical at center
1.2dBi
50-ohms
SMA or RP-SMA
–20°C to +85°C
15.5 mm
(0.61")
5.6 mm
(0.22")
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-916-CW-HW (with RP-SMA connector)
ANT-916-CW-HW-SMA (with SMA connector)
–
1
–
Revised 11/18/13
VSWR Graph
VSWR
3:1
1.490
Reflected Power
25%
2:1
11%
1:1
816MHz
916MHz
0%
1016MHz
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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Data Sheet ANT-916-CW-HW
by
stm32/stm8
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