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5.2

Matching Circuit

Like all antennas, surrounding components, enclosures, and changes to the GND plane dimensions can alter

performance. A pi-matching network like the one shown below is required in case adjustments need to be

made. The antenna EVB has a similar matching network. The components on the EVB are a good starting

point for a new design, but will need to be adjusted upon integration for best performance. The zero ohm

resistor is needed for the ability to solder down a coax pigtail to make measurements with a vector network

analyzer

.

5.3

Fine Tuning Element vs. Centre Frequency

This antenna includes a fine tuning element (as shown in the land patterns above) that can be used to slightly

shift antenna resonance.