An antenna matching device for a dual-frequency tire pressure detector includes: a microcontroller (11) having a control pin (14); a dual-frequency signal unit (12) controlled by the microcontroller (11) to which one of two different frequency signals to generate; and a matching unit (31) having an input end (32), two external pins (34), and an output end (38), the input end (32) being electrically connected to the dual-frequency signal unit (12) to receive the frequency signals from the dual-frequency signal unit (12), the external pins (34) being electrically connected to two ends of a diode (36), respectively, with the control pin (14) electrically connected to one of the external pins (34), and the output end (38) being electrically connected to an antenna (91), wherein the matching unit (31) provides two impedances between the input end (34) and the output end (38) so that the microcontroller (11) controls an operating state of the diode (36) according to whether the control pin (14) is grounded, thereby switching between the impedances of the matching unit.
ANTENNA MATCHING DEVICE FOR DUAL-FREQUENCY TIRE PRESSURE DETECTOR
ANTENNENANPASSUNGSVORRICHTUNG FÜR DOPPELFREQUENZ-REIFENDRUCKDETEKTOR
DISPOSITIF DE CORRESPONDANCE D'ANTENNE POUR DÉTECTEUR DE PRESSION DE PNEU BIFRÉQUENCE
2020-03-18
Patent
Electronic Resource
English
ANTENNA MATCHING DEVICE FOR DUAL-FREQUENCY TIRE PRESSURE DETECTOR
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