ANT-916-PML
Data Sheet
Product Description
Designed for permanent attachment, the PML
½-wave whip tilts 180 degrees and delivers
outstanding performance in a cost-effective
package. An internal counterpoise eliminates
external ground plane dependence and maximizes
performance. The antenna is attached by
placing its base through a ¼" (6.35 mm) hole
in the product and securing it with a nut or by
threading it into a PEM-style insert. This method
of attachment is highly secure and saves the cost
of an antenna connector. The PML attaches to a
PCB or connector via 12" (30.48 cm) of RG-178
coax cable. Custom lengths and terminations are
available by special order.
8.2 mm
(0.32")
12.1 mm
(0.48")
by
123.0 mm
(4.84")
150.3 mm
(5.92")
Features
•
•
•
•
•
•
•
Cost-effective
Internal counterpoise
Tilts 180 degrees
Outstanding performance
Omni-directional pattern
Low VSWR
Integral 12" (30.48 cm) RG-178 coax cable
6.0 mm
(0.24")
7.9 mm
(0.31")
35.2 mm
(1.39")
Electrical Specifications
Center Frequency:
Bandwidth:
Wavelength:
VSWR:
Peak Gain:
Impedance:
Connection:
Cable:
Oper. Temp. Range:
916MHz
80MHz
½-wave
≤1.9
typical at center
–0.4dBi
50-ohms
Case-mount
12" (30.48 cm) RG-178 coax
–40°C to +90°C
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-PML
–
1
–
Revised 11/27/13
VSWR Graph
VSWR
3:1
1.131
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.
–2
–
Data Sheet ANT-916-PML
by
stm32/stm8
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