Patent ID: 7312676
Filing Date: 2007-12-25
Classification: H01P,H03H

Abstract:
1. A filter comprising: (a) a first resonator formed on a first dielectric layer; (b) a second resonator formed on the first dielectric layer, wherein a first end of the first resonator is connected to a first end of the second resonator, and wherein an electromagnetic coupling is formed by an electromagnetic field generated by the first resonator and an electromagnetic field generated by the second resonator; (c) a direct coupling capacitor formed by a first plate on a second dielectric layer and a second plate on a third dielectric layer; and (d) a via inductor coupled to the first end of the first resonator and the first end of the second resonator, wherein the via inductor extends through the first, second, and third dielectric layers, wherein the electromagnetic coupling is controlled by at least one of: