Patent ID: 6064281
Filing Date: 2000-05-16
Classification: H03H

Abstract:
A semi-lumped bandpass filter, comprising:a first plurality of .pi.-type capacitor network including a first capacitor coupled to a first node and a second node, a second capacitor coupled to the first node and a first ground node, and a third capacitor coupled to the second node and a second ground node;a second plurality .pi.-type capacitor network including a fourth capacitor coupled to a third node and a fourth node, a fifth capacitor coupled to the third node and a third ground, and a sixth capacitor coupled to the fourth node and a fourth ground node;a third plurality .pi.-type capacitor network including a seventh capacitor coupled to a fifth node and a sixth node, an eighth capacitor coupled to the fifth node and a fifth ground node, and a ninth capacitor coupled to the sixth node and sixth ground node;a first transmission line strip coupled to the first node and the third node;a second transmission line strip coupled to the fourth node and the fifth node;a third transmission line strip coupled to the second node and a seventh ground node;a fourth transmission line strip coupled to the sixth node and an eighth ground node;a input port and a output port coupled to the first node and the fifth node;wherein said filter includes at least two semi-lumped resonators connected in series with each other, said resonators comprising at least one of said first, second, and third plurality .pi.-type capacitor networks coupled to at least one of said first, second, third and fourth transmission line strips.