A double -frequency circuit structure for implementing vital sign detection and short-distance positioning

• Main Authors: YANG Zikai, ZHOU Shaohua, MA Jianguo
• Format: Patent
• Language: English
• Published: 28.06.2019
• Subjects: ANALOGOUS ARRANGEMENTS USING OTHER WAVES; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; DIAGNOSIS; HUMAN NECESSITIES; HYGIENE; IDENTIFICATION; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION ORRERADIATION OF RADIO WAVES; MEASURING; MEDICAL OR VETERINARY SCIENCE; PHYSICS; RADIO DIRECTION-FINDING; RADIO NAVIGATION; SURGERY; TESTING

The present invention discloses a double-frequency circuit structure for implementing vital sign detection and short-distance positioning, wherein a transmitting antenna (1) is connected in series with a power amplifier (2) and a first power divider (3), the first power divider (3) is connected with a second power divider (4) and a third power divider (5); output of the second power divider (4) is connected on one path with the first power divider (3), and connected on the other path with a first quadrature mixer (9) via a first bandpass filter (8); output of the third power divider (5) is connected on one path with the first power divider (3) and on the other path with a second quadrature mixer (11) via a second bandpass filter (10); a receiving antenna (12) is connected with a fourth power divider (13), output of the fourth power divider (13) is connected on one path with a third bandpass filter (14), a first low noise amplifier (15) and a first quadrature mixer (9) in series, and connected on the other path with a fourth bandpass filter (16), a second low noise amplifier (17) and a second quadrature mixer (11) in series. The present invention simplifies a Doppler radar circuit structure implementing vital sign detection and short-distance positioning, and reduces the costs of the Doppler radar circuit performing the two functions.