SPECIFICATION
Part No.
:
HA.31.A
Description
:
915MHz 2dBi
Embedded Helical Monopole Antenna
Features
:
Quarter wave-length Monopole Helical Antenna
915MHz ISM Band
2dBi peak gain and 68% efficiency
Direct mounted on board design
Mechanically sturdy in a compact size
Dimensions: 10.7mm, Ø10.2mm
RoHS compliant
DSP-15-8- SPE-16-8-017/C/WY
Page 1 of 24
1. Introduction
The HA.31.A is an ISM 915MHz quarter wave-length monopole antenna. This helical
coil antenna is perfect for your smart meter, smart security system, remote asset
monitoring, and other wireless communication devices.
The helical coil antenna has a 2dBi Peak gain and a 68% efficiency at 915MHz on a
126.8 x 80.1mm ground plane with matching components (orthogonally mounted to
ground plane, see HAD.B.31 performance).
Made of copper alloy, the helical coil is mechanically sturdy, with a wide-bandwidth. It
can be easily mounted on the surface of your device main board by soldering. The
antenna must be connected to a ground-plane to radiate efficiently.
DSP-15-8- SPE-16-8-017/C/WY
Page 2 of 24
Taoglas provides HAD.A.31 and HAD.B.31 evaluation boards to show performance
when two antennas are parallel mounted or orthogonally mounted to the ground plane.
Small embedded antennas can easily detune and/or have reduced efficiency in
different device environments. Taoglas provides matching, and other custom tuning,
design and support services, subject to MOQ and NRE. Contact a regional Taoglas
facility for details.
DSP-15-8- SPE-16-8-017/C/WY
Page 3 of 24
2. Specification
ELECTRICAL
Application Bands
ISM 915MHz
Mounting Direction
Frequency (MHz)
HAD.A.31
902
915
HAD.B.31
928
Return Loss (dB)
902
915
928
