ANT-916-SP
Data Sheet
Product Description
The Splatch uses a grounded-line technique to
achieve outstanding performance from a tiny
surface-mount element. This unique antenna is
designed for hand or reflow-mounting directly to a
product’s circuit board. Its low cost makes it ideal
for volume applications. Unlike many compact
antennas, the Splatch exhibits good proximity
performance, making it an appropriate choice for
handheld applications such as remote controls,
pagers and alert devices.
27.94 mm
(1.10")
by
13.7 mm
(0.54")
1.5 mm
(0.06")
5.1 mm
(0.20")
Features
•
•
•
•
•
•
•
Very low cost
Ultra-compact package
Direct PCB attachment
Ideal for concealed / internal mounting
Perfect for compact portable devices
Suitable for hand or reflow-assembly
Resistant to proximity effects
Recommended Footprint
5.1 mm
(0.20")
2.5 mm
(0.10")
2.0 mm
(0.08")
Recommended Mounting
Splatch
1
1
ANT-916-SP
Electrical Specifications
Center Freq.:
Recom. Freq. Range:
Wavelength:
VSWR:
Peak Gain:
Impedance:
Oper. Temp. Range:
Connection:
916MHz
900–930MHz
¼-wave
≤
1.9 typ. at center
1.4dBi
50-ohms
–40°C to +130°C
Surface-mount
No ground plane or traces
under the antenna
PCB pads for the Splatch
Vias to ground plane
Ground plane on bottom
layer for counterpoise
50-ohm microstrip line
Electrical specifications and plots measured on 3.8 cm x 8.4 cm
(1.50" x 3.30") reference ground plane
Ordering Information
ANT-916-SP (supplied in tubes of 20 pieces)
–
1
–
Revised 3/26/14
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
1.328
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 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-SP
by
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