Signal transmission device using electromagnetic resonance coupler

A manufacturing method for a signal transmission device including

• a first lead frame having a first major surface and a second major opposite to the first major surface,
• a second lead frame having a third major surface and a fourth major surface and isolated from the first lead frame, the fourth major surface located opposite to the third major surface,
• a transmission circuit that sends a transmission signal,
• a receiving circuit, and
• an electromagnetic resonance coupler that transmits the transmission signal, sent by the transmission circuit, to the receiving circuit in a contactless manner,
• the manufacturing method comprising:
• arranging the electromagnetic resonance coupler across between the second major surface of the first lead frame and the fourth major surface of the second lead frame;
• arranging, after the arranging of the electromagnetic resonance coupler, the transmission circuit on the first major surface of the first lead frame;
• and
• arranging, after the arranging of the electromagnetic resonance coupler, the receiving circuit on the third major surface of the second lead frame.