| 摘要 |
<p>A splitter exhibiting an improved attenuation amount in a lower frequency range than the passing bands of first and second bandpass filters and further exhibiting a less insertion loss in the passing bands. A splitter (1) has a first bandpass filter (F<SUB>1</SUB>), which exhibits a relatively low passing band, and also has a second bandpass filter (F<SUB>2</SUB>), which exhibits a relatively high passing band. The splitter also has a first capacitance (C<SUB>S</SUB>) connected in series with and between a common terminal (3) and an antenna (2), a second capacitance (C<SUB>p</SUB>) connected between a ground potential and a junction between the first capacitance (C<SUB>S</SUB>) and the antenna (2), and a inductance (L<SUB>p</SUB>) connected between the foregoing junction and the ground potential and also connected in parallel to the second capacitance (C<SUB>p</SUB>). The resonance frequency of a parallel resonance circuit constituted by the second capacitance (C<SUB>p</SUB>) and inductance (L<SUB>p</SUB>) is established such that it is higher than the passing band of the second bandpass filter (F<SUB>2</SUB>).</p> |
