Patent ID: 6552630
Filing Date: 2003-04-22
Classification: H03H

Abstract:
A bi-directional low-pass filter for use in a communication network, said communication network including a high-band communication terminal, a low-band communication terminal, and a signal channel common to said high-band and low-band communication terminals, said low-pass filter comprising:a first, a second, a third and a fourth input/output ends; a first, a second, a third and a fourth inductors electrically connected to said first, second, third and fourth input/output ends, respectively; a first capacitor having a first and a second ends; a fifth, a sixth, a seventh and an eighth inductors arranged in a manner that said fifth and sixth inductors are electrically connected to said first and second inductors, respectively, and further to said first end of said first capacitor in series, and said seventh and eighth inductors are electrically connected to said third and fourth inductors, respectively, and further to said second end of said first capacitor in series; a first, a second, a third and a fourth compensation circuits electrically connected to said fifth, sixth, seventh and eighth inductors in parallel, each of said compensation circuits including a compensation capacitor and a compensation resistor interconnected in series; and a first, a second, a third and a fourth high-band attenuation circuits electrically connected to said compensation resistors of said first, second, third and fourth compensation circuits in parallel, respectively, each of said high-band attenuation circuits including a high-band attenuation inductor and a high-band attenuation resistor.