ETC ALA01070095A

SPECIFICATION
Model No.
:
ALA.01
Part No.
:
ALA.01.07.0095A
Product Name
:
1575MHz Ceramic Active Loop Module
Features
:
16dB One Stage
PCB Dims: 45*10*2.3mmmm
RoHS compliant
Photo
:
SPE-12-8-036/B/WY
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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 today’s 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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LNA
Parameter
Specification
Frequency
1575.42 ± 1.023MHz
Gain
Noise Figure
Typ. 16dB @ 3V
Typ. 17.8dB @ 5V
Typ. 1.3dB @ 3V
Saw Filter (fo=1575.42MHz)
Filter (out of band
40dB typ. fo±50MHz
attenuation)
45dB min. fo±100Mhz
Output VSWR
< 2.0
Input Voltage
DC = 2.6~5.0V
Current
DC = 13mA at 3.0V
Cable *& Connector
Parameter
Specification
RF Cable
955mm 1.13 Coaxial Cable
Connector
IPEX MHF(U.FL)
Total Specification
Parameter
Specification
Frequency
1575.42 ± 1.023MHz
Gain
16 ± 4dB @ 90o
Output Impedance
50Ω
Polarization
Linear
Output VSWR
Max 2.0
Operation
Temperature
-40°C to + 85°C
Storage
Temperature
-40°C to + 90°C
Humidity
10 to 95%
Input Voltage
Min. 2.6V,
Typ. 3.0V,
Max. 5.0V
Dimensions
45*10*2.3mm
Weight
1.35±0.5g (typical)
SPE-12-8-036/B/WY
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3. Performance Measurement
3.1 Block Diagram
4. Measurement Method
4.1 Chip
a) Reflection Co-efficient Measurement
a. Equipment: Network Analyzer (Aglient E5071A)(Fig.1)
b. Item S11 Log Chart(Return Loss) S11 Smith Chart (impedance)
Figure 1. Network Analyzer
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b) Pattern Measurement
a. Equipment: Anechoic Chamber (Fig. 2), Network Analyzer (Aglient E8753ES)
b. Item: Gain Pattern, Axial ratio
Figure 2. Quiet Room
Figure 3. Schematic of measurement set-up
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4.2 LNA
a) Parameter Measurement
a. Equipment: Network Analyzer (Aglient E5071B)(Fig.4)
b. S11, S12, S21, S22
Figure 4. Network Analyzer
a) Noise Figure Measurement
a. Equipment: Noise Meter (Aglient E4407B)(Fig.5)
b. Environment: Shielding Room (Fig. 6)
c. Item: N.F (Noise Figure)
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5. Measured Values
5.1 Chip
5.1.1 S11 Smith Chart (Impedance)
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5.1.2 S11 Log Chart (Return Loss): Bandwidth S11 <-10dB
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5.1.3 S11 VSR
5.1.4 Radiation Patterns (Excluding LNA)
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Plane
XZ
YZ
XY
Average Gain
-1.62
-1.57
-3.44
Peak Gain
4.92
1.89
2.75
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5.2 Low Noise Amplifier (LNA)
5.2.1 S11 (network analyzer input power -40dB)
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5.2.2 S12 (network analyzer input power -40dB)
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5.2.3 S21 (Gain) (network analyzer input power -40dB)
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5.2.4
S22 (Gain) (network analyzer input power -40dB)
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5.3 Noise Figure
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6. Drawing
1
Chip Antenna: 5*3*0.5mm
2
Cable Ø1.13 L=95±5mm
3
IPEX MHFI(U.FL)
4
Shielding Case
5
PCB
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