ANTENNA DEVICE

• Main Authors: NAITO HIROMICHI, OKADA NORIAKI
• Format: Patent
• Language: English
• Published: 26.03.2009
• Subjects: ANTENNAS, i.e. RADIO AERIALS; BASIC ELECTRIC ELEMENTS; ELECTRIC COMMUNICATION TECHNIQUE; ELECTRICITY; TRANSMISSION

PROBLEM TO BE SOLVED: To provide an antenna device capable of executing impedance matching with an antenna without using a reception signal that is actually inputted through the antenna. SOLUTION: A transmitting/receiving IC 40 constituting the antenna device 1 generates a power signal P11 for performing impedance matching in a desired frequency on the basis of an output command outputted from a microcomputer 70 and outputs the power signal P11 to the antenna 10. A direct current voltage converter 60 constituting the antenna device 1 acquires a reflection power signal P21 that is generated larger as impedance matching to the antenna 10 is not made more through a directional coupler 30 and converts the reflection power signal P21 into a direct current voltage signal D. The microcomputer 70 constituting the antenna device 1 generates the power signal P11 in the transmitting/receiving IC 40, outputs the power signal P11 and controls a reverse bias voltage B so as to minimize the magnitude of the direct current voltage signal D while changing the magnitude of the reverse bias voltage B within a prescribed range. COPYRIGHT: (C)2009,JPO&INPIT