| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To attain both of improvement in the reception sensitivity and higher attenuation amount in the region out of the pass band, and make a smaller product, in a high frequency circuit equipped with a low noise amplifier, a high frequency component and communication equipment. <P>SOLUTION: The high frequency circuit includes a first band pass filter connected to the input side of a low noise amplifier for amplifying a signal in a frequency band of a first communication system and a second band pass filter connected to the output side of the low noise amplifier. At the frequency band of the first communication system, the insertion loss of the first band pass filter is smaller than the insertion loss of the second band pass filter. At at least a part of a stop band out of the pass band, the attenuation amount of the second band pass filter is larger than the attenuation amount of the first band pass filter. <P>COPYRIGHT: (C)2010,JPO&INPIT</p> |
