| 摘要 |
PROBLEM TO BE SOLVED: To shift resonance frequency to a sufficiently higher frequency to have no influence on the reception, the resonance frequency being generated due to transmission characteristics, in a combination with a low-pass filter as much as possible to reduce own internal stray capacitance of a switch diode. SOLUTION: A first switch diode 4 is connected between a first and second conductor patterns 1a, 1b, an inductance element 5a is connected between the first conductor pattern 1a and a third conductor pattern 1c, a first capacitance element 5c is connected between the third conductor pattern 1c and a fourth conductor pattern 1d, a second switch diode 8 is composed of a bare chip 8a and this chip 8a is mounted on the fourth pattern 1d, with its cathode electrode being connected to this pattern 1d and its anode electrode being connected to the third conductor pattern 1c through a bonding wire 9.
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