| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a high frequency equipment excellent in ESD resistance, especially an antenna diplexer having a multiband high frequency switching function, by using a small ESD protection circuit of low cost. <P>SOLUTION: The signal circuit comprises a signal separating part which separates the signal of first frequency band from the signal of second frequency band which is lower than the first frequency band, a first SAW filter in which the signal of first frequency band outputted from the signal separating part is inputted, a second SAW filter in which the signal of second frequency band outputted from the signal separating part is inputted, and a highpass filter which is arranged in the signal line connecting the signal separating part and the second SAW filter and allows the signal of second frequency band to pass while limits the signal of lower frequency than the second frequency band from passing. <P>COPYRIGHT: (C)2007,JPO&INPIT</p> |
