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    • 100. 发明公开
    • HIGH FREQUENCY PART
    • HOCHFREQUENZELEMENT
    • EP2003788A1
    • 2008-12-17
    • EP08703453.4
    • 2008-01-18
    • Murata Manufacturing Co. Ltd.
    • UEJIMA, Takanori
    • H04B1/50H01P1/15H03H7/075H03H7/46
    • H01P1/2135H01P1/15H01P1/213H03H7/0115H03H7/175H03H7/1758H03H7/1766H03H7/46H03H2001/0085H03H2250/00H04B1/005
    • 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.
    • 提供了一种高频分量,其中即使在低频电路中设置SAW滤波器并且存在阻抗失配,高频传输特性也不会降低。 高频分量包括双工器(1),其中高通滤波器(102)和低通滤波器(101)与天线端口并联连接,高频电路级联到高通 滤波器(102)和级联到低通滤波器(101)的低频电路。 导致发生阻抗失配的滤波器连接到低频电路。 低通滤波器(101)包括线(Lt1)。 低通滤波器(101)由包括线路(Lt1)的并行谐振电路(101A)和包括线路(Lt1)的串联电路(101B)构成。 并联谐振电路(101A)的谐振频率是高频发送/接收信号的陷波频率。 低通滤波器(101)的所有元件的谐振频率是在高频下发生的不期望的谐振的陷波频率。