Microstrip composite antenna for receiving and/or sending keying modulation signal

A microstrip composite antenna, comprising a strip radiation antenna and a microstrip radiation line connected with each other, wherein,

• the microstrip radiation line comprises a first radiation line and a second radiation line printed in a printed circuit board (PCB), a first end of the first radiation line is connected to a signal input and/or output point of a keying modulation signal, a second end of the first radiation line is connected to the second radiation line, and the second radiation line is further connected to a ground plane of the PCB;
• the strip radiation antenna comprises a middle section, a first support section and a second support section located at two ends of the middle section, respectively, both the first support section and the second support section are bent towards a same side of the middle section, a first pin formed at an end of the first support section is connected to the second radiation line, and the second pin formed at an end of the second support section is connected to the ground plane of the PCB through a capacitor;
• and
• the strip radiation antenna is located above the microstrip radiation line, and at least one of the first radiation line or the second radiation line is parallel to the middle section.