Coupler and electronic device

A radio frequency circuit board comprising:

• a printed circuit board (PCB);
• and
• a coupler disposed on the PCB, wherein the coupler comprises:
• a signal input end;
• a signal output end[
• a coupling end;
• an isolation end;
• a main signal hole disposed on the printed circuit board PCB;
• and
• a first coupling hole disposed on the PCB,
• wherein the coupler is configured to couple a signal transmitted on a path between the signal input end and the signal output end to a path between the coupling end and the isolation end, a first end of the main signal hole is coupled to the signal input end, a second end of the main signal hole is coupled to the signal output end, a first end of the first coupling hole is coupled to the coupling end, a second end of the first coupling hole is coupled to the isolation end, and in a thickness direction of the PCB, the first end of the first coupling hole and the first end of the main signal hole are close to a first side of the PCB, and the second end of the first coupling hole and the second end of the main signal hole are close to a second side of the PCB, and
• wherein the signal input end of the coupler is for coupling to an output end of a radio frequency amplifier and the signal output end of the coupler is for coupling to an input end of a duplexer, or the signal input end of the coupler is for coupling to an output end of the duplexer and the signal output end of the coupler is for coupling to an antenna.

An electronic device for wireless communication, comprising:

• a radio frequency amplifier;
• a duplexer;
• an antenna;
• and
• a coupler comprising:
• a signal input end;
• a signal output end;
• a coupling end;
• an isolation end;
• a main signal hole disposed on a printed circuit board (PCB) and a first coupling hole disposed on the PCB,
• wherein the coupler is configured to couple a signal transmitted on a path between the signal input end and the signal output end to a path between the coupling end and the isolation end, a first end of the main signal hole is coupled to the signal input end, a second end of the main signal hole is coupled to the signal output end, a first end of the first coupling hole is coupled to the coupling end, a second end of the first coupling hole is coupled to the isolation end, and in a thickness direction of the PCB, the first end of the first coupling hole and the first end of the main signal hole are close to a first side of the PCB, and the second end of the first coupling hole and the second end of the main signal hole are close to a second side of the PCB,
• wherein a signal input end of the coupler is coupled to an output end of the radio frequency amplifier and a signal output end of the coupler is coupled to an input end of a duplexer, or the signal input end of the coupler is coupled to an output end of the duplexer and the signal output end of the coupler is coupled to the antenna.