Patent ID: 7202759

Claim:
A temperature-dependent radio-frequency attenuator, comprising: a first temperature-dependent resistor having a first terminal provided to a first end of a first transmission line section and a second terminal provided to a first end of a second transmission line section; a second temperature-dependent resistor having a first terminal provided to a second end of said first transmission line section and a second terminal provided to ground; a third temperature-dependent resistor having a first terminal provided to said first end of said first transmission line section and a second terminal provided to ground; a fourth temperature-dependent resistor having a first terminal provided to said first end of said second transmission line section and a second terminal provided to ground; a fifth temperature-dependent resistor having a first terminal provided to a second end of said second transmission line section and a second terminal provided to ground, wherein at least one of said first, second, third, fourth, and fifth temperature-dependent resistors has a first temperature coefficient configured such that said attenuator changes attenuation at a controlled rate with respect to changes in temperature; a third transmission line section, wherein a first end of said third transmission line section is provided to said second end of said second transmission line section, and wherein a first terminal of a sixth temperature-dependent resistor is provided to a second end of said third transmission line section and a second terminal is provided to ground; and wherein a characteristic impedance of said third transmission line section is different from a characteristic impedance of said second transmission line section.