Patent ID: 9014645
Filing Date: 2015-04-21
Classification: H03H,H04B

Abstract:
1. A wireless communication device, comprising: an antenna; a wireless controlling circuit for processing a signal that the antenna transmits and receives; a matching section which is connected between the antenna and the wireless controlling circuit and has a variable reactance; signal detector for detecting an intensity of the signal passed between the antenna and the wireless controlling circuit; controller for changing the variable reactance of the matching section; the controller determining whether a resonance frequency of the antenna exists on a side higher than or lower than an operation frequency of the antenna on the basis of a change in the intensity which is caused by a change in the variable reactance; and a storage section in which a plurality of matching adjustment values for defining the variable reactance, the controller further adjusting the variable reactance to a value defined by one of the plurality of matching adjustment values so that the resonance frequency is closer to the operation frequency on the basis of a result of determination of the controller, wherein: the operation frequency is a frequency for use in transmission via the antenna; and the controller determines whether the resonance frequency of the antenna exists on the side higher than or lower than the operation frequency of the antenna in accordance with a change in a ratio of an intensity of a reflected wave to a progressive wave toward the antenna, wherein the controller determines that: the resonance frequency exists on the side higher than the operation frequency in a case where the controller changes the variable reactance of the matching section to a negative direction and the ratio of the intensity of the reflected wave to the progressive wave toward the antenna is increased, the resonance frequency exists on the side lower than the operation frequency in a case where the controller changes the variable reactance of the matching section to the negative direction and the ratio of the intensity of the reflected wave to the progressive wave toward the antenna is decreased, the resonance frequency exists on the side lower than the operation frequency in a case where the controller changes the variable reactance of the matching section to a positive direction and the ratio of the intensity of the reflected wave to the progressive wave toward the antenna is increased, and the resonance frequency exists on the side higher than the operation frequency in a case where the controller changes the variable reactance of the matching section to a positive direction and the antenna the ratio of the intensity of the reflected wave to the progressive wave toward the antenna is decreased.