SPE-11-8-129/H/NB

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7. 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. Make S1 a zero ohm resistor

and leave S2 and S3 unpopulated when building first prototypes. These components

will likely need to be adjusted upon integration to provide the best match between the

antenna and transmission line. The additional zero ohm resistor in the diagram is

needed for the ability to solder down a coax pigtail to make measurements with a

vector network analyzer.

S1

Antenna

0 Ohm

Resistor

Transmission Line