专利名称：Mobile communications device发明人：Seiki, Yoshihiro申请号：EP02004521.7申请日：20020227公开号：EP1237289A3公开日：20040204
专利附图：
摘要：A conventional mobile communications device typically employs a non-directional antenna so that the antenna offers a satisfactory gain irrespective of how thedevice is used, resulting in much radiation of electromagnetic waves from the antennatoward the human body. Using a directional antenna instead of a non-directional antenna
reduces the radiation of electromagnetic waves from the antenna toward the humanbody, but lowers the antenna gain in a stand-by state and thus increases the risk of failingto receive an incoming call. According to the invention, a mobile communications devicehas a non-directional antenna, a directional antenna, a transmitter/receiver section, aswitch for switching states of connection between the non-directional and directionalantennas and the transmitter/receiver section, and a control circuit for controlling theswitch. This reduces the radiation of electromagnetic waves from the antenna toward thehuman body but nevertheless ensures a satisfactory antenna gain even in a stand-bystate.
申请人：Sharp Kabushiki Kaisha
地址：22-22, Nagaike-Cho, Abeno-Ku Osaka 545-0013 JP
国籍：JP
代理机构：Müller - Hoffmann & Partner
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