Patent ID: 6480708
Filing Date: 2002-11-12
Classification: H01P

Abstract:
A variable attenuator comprising:a first comb line comprising first and second lines which are electromagnetically coupled; a second comb line comprising third and fourth lines which are electromagnetically coupled; a first terminal connected to one end of said first line; a second terminal connected to one end of said second line; first and second diodes connected to said third and fourth lines of said second comb line, said first diode being connected between said third line and a ground with an anode of said first diode connected to one end of said third line, the second diode being connected between said fourth line and the ground with an anode of said second diode connected to one end of said fourth line, the other ends of said first and third lines being connected, and the other ends of said second and fourth lines being connected; a first control terminal connected to the junction of said other end of said first line and said other end of said third line for controlling said first diode to turn on and off; and a second control terminal connected to the junction of said other end of said second line and said other end of said fourth line for controlling said second diode to turn on and off.