| 摘要 |
<p>There is provided a high-frequency component in which, even when a SAW filter is provided in a low-frequency circuit and there is an impedance mismatch, high-frequency transmission characteristics are not degraded. The high-frequency component includes a diplexer (1) in which a high-pass filter (102) and a low-pass filter (101) are connected in parallel with an antenna port, a high-frequency circuit cascaded to the high-pass filter (102), and a low-frequency circuit cascaded to the low-pass filter (101). A filter which causes an impedance mismatch to occur is connected to the low-frequency circuit. The low-pass filter (101) includes a line (Lt1). The low-pass filter (101) is constituted by a parallel resonant circuit (101A) including the line (Lt1) and a series circuit (101B) including the line (Lt1). A resonance frequency of the parallel resonant circuit (101A) is a trap frequency of a high-frequency transmission/reception signal. A frequency of resonance of all elements of the low-pass filter (101) is a trap frequency of undesired resonance that occurs at high frequencies.</p> |
