SPE-12-8-036/B/WY Page 2 of 16
1. Introduction
The active loop antenna ALA.01 is best suited for applications where omni-directionality
is important. The average gain is similar to an 18mm active patch antenna but in a much
narrower profile, only 2.3mm at its highest point, allowing this antenna to be used
perpendicular to the device main-board, or placed adjacent to the top or bottom of
device main board. A one stage LNA combined with a SAW filter boosts the S/N (C/N) of
the GPS system and helps to overcome some noise effects from todays crowded device
boards that passive antennas cannot resolve.
The antenna can be placed in a plastic slot in the device housing. Alternatively adhesive
foam, hot-melt, or non-conductive screws could be used to mount the antenna. The core
antenna design principle of loop current flow tends to lock-out a lot of surface noise
from close circuitry from entering the antenna.
2. Specification
Antenna
Parameter
Specification
Frequency
1575.42 ?1.023MHz
Bandwidth (10dB
return loss)
70MHz typical
Peak Gain
Typ. 3.1dBi
Avg. Gain
-2.2dBI
Polarization
Linear
VSWR
2 max (depends on the special environment)
Dimension
5*3*0.5mm
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