Patent ID: 7915979
Filing Date: 2011-03-29
Classification: H01P

Abstract:
1. A switchable frequency response microwave filter, comprising: a signal input electrode receiving an external signal, an input voltage-controlled varactor coupled to said signal input electrode and a first voltage source; a dual-mode ring resonator coupled to said input voltage-controlled varactor, a grounding terminal and a second voltage source and receiving said external signal via said input voltage-controlled varactor; an output voltage-controlled varactor coupled to said dual-mode ring resonator; a set of perturbing voltage-controlled varactors respectively arranged in different positions of said dual-mode ring resonator; and a signal output electrode coupled to said output voltage-controlled varactor and said grounding terminal, wherein said output voltage-controlled varactor transfers said external signal from said dual-mode ring resonator to said signal output electrode to output a filtered signal, and wherein said first and second voltage sources are used to modulate said set of perturbing voltage-controlled varactors to control phase velocities of an even mode and an odd mode of said external signal in said dual-mode ring resonator.