Abstract: The disclosure relates to the lightning protection of the transmitters in a transmission system. An etched circuit with lightning protection comprises at least one main line connected to a connector adapted to the output of a transmission antenna of the transmission system working at a fixed frequency or in a narrow frequency band around the fixed frequency. The circuit comprises a main line and at least one first line connected to the main line and substantially equivalent to an open circuit with respect to the main line for the stated frequency. The circuit can also perform a harmonic filtering function, thus increasing compactness by using a single circuit for both functions.

Abstract: The disclosure relates to the lightning protection of the transmitters in a transmission system. An etched circuit with lightning protection comprises at least one main line connected to a connector adapted to the output of the transmission antenna of the transmission system working at a fixed frequency f0 or in a narrow frequency band &Dgr;f0, the circuit comprising a capacitor, wherein said circuit comprises at least one first line with a length l1 and a width that may or may not be constant, connected to said connector and terminated by a short-circuit forming an open circuit with respect to the main line. This circuit also carries out the harmonic filtering function, thus increasing compactness by using a single circuit for both functions. This device can also be applied to any field requiring either or both of these functions.