Antenna impedance matching circuit

摘要: PURPOSE:To obtain quickly the matching state by providing plural series circuits comprising capacitors with fixed capacitance and switches provided at its grounding side, constituting an impedance circuit them inductances a reflection power measuring control transmitter side. CONSTITUTION:The for reflecting is constituted input/output device 50, CPU 60 diode drive sections 30, 40. A where on end of other than 10, 20 grounded initial set state. In starting new movement antenna, extracted directional coupler 9, 51 A/D converter 52 measured so as to discriminate whether or not minimized. That is, compared When said minimum value, number turned-on PIN diodes 46-48 adjusted when measurement shows are operated adjustment similar above attained. Then value reaches repeating adjustment.