ANT-916-CW-RH
Data Sheet
Product Description
The RH Series utilizes a helical element to greatly
reduce the physical length of the antenna housing.
They are ideal for small products where cosmetic
or functional requirements dictate a compact,
aesthetically pleasing antenna package. Despite
their tiny size, RH Series antennas are ruggedly
constructed and able to withstand punishing
environments just like our larger whips. RH Series
antennas attach via an SMA or Part 15 compliant
RP-SMA connector.
8.0 mm
(0.31")
by
51.0 mm
(2.00")
Features
•
•
•
•
•
•
•
•
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Reduced-height helical whip
Excellent performance
Omni-directional pattern
Low VSWR
Fully weatherized
Rugged & damage-resistant
SMA or Part 15 compliant RP-SMA connector
Available in black or custom colors
Use with plastic* or metal enclosures
3.8 mm
(0.15")
10.0 mm
(0.39")
8.5 mm
(0.33")
* Requires proximity ground plane
Electrical Specifications
Center Frequency:
Recom. Freq. Range:
Bandwidth:
Wavelength:
VSWR:
Peak Gain:
Impedance:
Connection:
Oper. Temp. Range:
916MHz
900–935MHz
35MHz
¼-wave
< 1.9 typical at center
–1.3dBi
50-ohms
RP-SMA or SMA
–40°C to +90°C
3.6 mm
(0.14")
Electrical specifications and plots measured on 10.16 cm x
10.16 cm (4.00” x 4.00”) reference ground plane
Ordering Information
ANT-916-CW-RH (with RP-SMA connector)
ANT-916-CW-RH-SMA (with SMA connector)
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Revised 1/5/2017
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
1.733
Reflected Power
25%
2:1
11%
1:1
878.5MHz
916MHz
0%
953.5MHz
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.
Copyright © 2017 Linx Technologies
159 Ort Lane, Merlin, OR 97532
Phone: +1 541 471 6256
Fax: +1 541 471 6251
www.linxtechnologies.com
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ANT-916-CW-RH Data Sheet
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