A coupler, also known as an antenna tuner or matching network, can adjust the impedance of the antenna to match that of the transceiver. This is typically done by varying the inductance and capacitance in the coupler to match the impedance of the antenna to that of the transceiver.
the installation of an HF coupler between the HF antenna and the transceiver in an aircraft communication system is done to provide impedance matching, optimal power transfer, and protection to the transceiver.
