| 摘要 |
PURPOSE: A device for attenuating a band of a transmission frequency in a wireless communication terminal, is provided to make a transmission frequency pass two SAW filters serially connecting a 60MHz band signal of a 1810-1910MHz transmission frequency with one channel group without dividing the transmission frequency into two channel groups, to attenuate a frequency bandwidth, so as to prevent interference by duplicated transmission frequency and receiving frequency. CONSTITUTION: A driver(30) amplifies a signal, converted into a high-frequency signal from a mixer, into a predetermined level for outputting. A first SAW filter(32) filters a signal having a 60MHz band of frequency outputted from the driver(30) to attenuate the band, and outputs the filtered signal to a second SAW filter(34). The second SAW filter(34) filters the signal outputted from the first SAW filter to attenuate the band, and outputs the filtered signal to a power amplifier(36). The power amplifier power-amplifies the signal outputted from the second SAW filter, and outputs the amplified signal to an antenna.
|
