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Why does Antenova recommended Pi matching circuits?

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An antenna changes its tuning when embedded, so you need to include a “PI matching network” between the antenna and the radio - please see further information in data sheet about location.
Antenna matching is the process of aligning the impedance of both the antenna chip/module and the RF circuitry.
This process allows an antenna to radiate at the intended frequency with minimal deviation, vastly increasing performance capabilities.
An unmatched antenna will suffer a significantly reduced range and may render the device unable to operate effectively.'

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Senior Antenna Apps Specialist at Antenova Geoff is an antenna design-in and OTA measurement specialist. His knowledge of FCC and world carrier requirements is second-to-none.

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