Patent ID: 8952756
Filing Date: 2015-02-10
Classification: H01Q,H03F,H04B

Abstract:
1. An antenna drive apparatus configured to apply an antenna drive voltage to an antenna from an H-bridge circuit including four switching elements to drive the antenna, comprising: a switching mechanism configured to switch between a full-bridge state in which a differential voltage between a pulse voltage and a reverse pulse voltage reversed from the pulse voltage is applied to the antenna as the antenna drive voltage by the H-bridge circuit, and a half-bridge state in which the pulse voltage or the reverse pulse voltage is applied to the antenna as the antenna drive voltage by the H-bridge circuit; and a control mechanism configured to control the switching mechanism so that the frequency of the full-bridge state per unit time during an initial period of driving of the antenna in a transmission period for transmitting a transmission signal by the antenna becomes higher than that during the subsequent period subsequent to the initial period in the transmission period.