M10478 Datasheet, PDF (15/30 Pages) List of Unclassifed Manufacturers – GPS RADIONOVA® RF Antenna Module

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m2m
External Matching
GPS RADIONOVA^® RF Antenna Module
Part No. M10478
The M10478 module uses a matching circuit on the host PCB in order to fine-tune the on-board antenna
to each specific application. This “external matching” allows compensating for the detuning of the antenna
caused by various different components that can be close to the M10382 module in the actual application
(plastic case, battery, speakers etc).
The external matching must be placed on the host PCB between ANT_OUT (PIN3) and ANT_IN (PIN1).
Although 2 components are typically more than enough to match the antenna to the 50Ω impedance required,
a P-network topology with 3 components is recommended for safe proving.
Schematic
Both low-pass and hi-pass topologies for the matching network can be used with similar results. As the
same footprint can be used for both topologies, the exact type and value of the components used can be
determined during the optimization phase.
• The initial values can be simply chosen as the null-circuit (no impedance matching):
• Hi-pass:
• C1 = 18pF
• L1, L2 = Not Fitted
• Low-pass:
• L1 = Jumper (0Ω resistor)
• C1, C2 = Not Fitted
Antennas for Wireless M2M Applications
15
Product Specification 12MD-0050-2-PS