| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a method of changing a transmission/reception frequency in a mobile station of a mobile phone by which the mobile phone is not made unavailable even temporarily without necessity of exchange even if the transmission/reception frequency is changed. <P>SOLUTION: In the transmission/reception frequency change method for changing the transmission/reception frequency of a mobile station 30a comprising an antenna duplexer 31 step by step, the antenna duplexer 31 is prepared with a transmission frequency band part 31c defining transmission frequency bands before and after a change as a passing band, a pre-change reception frequency band part 31a and a changed reception frequency band part 31b, a duplexer 37 including a pre-change reception frequency band part 37a and a changed reception frequency band part 37b is prepared, either a signal passed through the pre-change reception frequency band part 31a or a signal passed through the changed reception frequency band part 31b or both are amplified in accordance with changing the transmission/reception frequency step by step, and the amplified signals are passed through the duplexer 37. <P>COPYRIGHT: (C)2006,JPO&NCIPI</p> |
