Emergency rescue equipment comprising a harmonic reflector circuit

An emergency rescue equipment comprising:

• a harmonic reflector circuit having an antenna connected to non-linear circuit via a matching circuit;
• and
• a casing that in full or in part encloses the harmonic reflector circuit;
• wherein the harmonic reflector circuit is configured to receive a received signal at a receive frequency (fRX), and configured to re-transmit the received signal at a transmit frequency (fTX);
• wherein the transmit frequency is a multiple of the receive frequency;
• wherein the receive frequency (fRX) is in an interval from a first frequency to a second frequency, where:
• the first frequency is at least 800 MHz and within the radio-frequency range;
• the second frequency is at least 34 MHz higher than the first frequency and within the radio-frequency range;
• and
• the received signal is re-transmitted at the transmit frequency (fTX) with an output power (Pout) of 70%-100% of a maximum available output power (Pmax).