发明名称 |
COMMUNICATION DEVICE AND PORTABLE COMMUNICATION TERMINAL USING THE SAME |
摘要 |
When commonly using a receiving antenna and a transmitting antenna having mutually opposing characteristics, the present invention makes it possible to commonly use the antennas without deteriorating the characteristics of both antennas. In a communication apparatus including both of an RF-ID function circuit 1 to perform contactless communication with an external reader/writer device and a reader/writer function circuit 2 to perform contactless communication with an external RF-ID, there is disposed a common antenna 10 shared therebetween. And, a transmitting and receiving resonance frequency switching circuit 11 is connected in parallel to the common antenna 10; when selecting each function, a resonance frequency is automatically changed by the transmitting and receiving resonance frequency switching circuit 11.
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申请公布号 |
EP2088538(A1) |
申请公布日期 |
2009.08.12 |
申请号 |
EP20070830405 |
申请日期 |
2007.10.23 |
申请人 |
NEC CORPORATION |
发明人 |
UCHIYAMA, JIROU;SAKURAI, SHIGEKI;YAMAGA, MASASHI |
分类号 |
G06K19/07;G06K7/00;G06K19/077;H01Q1/22;H01Q1/38;H01Q7/00;H04B5/02 |
主分类号 |
G06K19/07 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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