Patent ID: 6011446
Filing Date: 2000-01-04
Classification: H01P,H03B,H03F

Abstract:
A direct current (DC) biasing or grounding circuit for coupling to a radio frequency (RF) circuit, wherein said DC biasing or grounding circuit is capable of substantially blocking the transmission therethrough of a first radio frequency energy cycling at a selected frequency, comprising:a first transmission line having a first portion thereof for connection to said RF circuit and a second portion thereof, wherein a first length between said first and second portions is about 90 electrical degrees or about an odd multiple thereof for a second radio frequency energy cycling at a pre-determined frequency;a low impedance-to-ground structure coupled to said first transmission line line by way of said second portion thereof; anda second transmission line coupled to said first transmission by way of said first portion thereof, said second transmission line having a second length sufficient to increase the normalized impedance at said first portion of said first transmission line for said first radio frequency.