Patent ID: 7315223

Claim:
An RF circuit comprising: a wafer including a first surface and a second surface; a first microstrip line deposited on the first surface of the wafer, said first microstrip line including a widened portion; a first ground plane deposited on the first surface of the wafer, said first ground plane including a first extended section and a second extended section adjacent to the widened portion of the first microstrip line and defining a slot therebetween, wherein the first and second extended portions of the first ground plane, the widened portion of the first microstrip line and the slot therebetween define a first co-planar waveguide having a characteristic impedance; a second microstrip line deposited on the second surface of the wafer, said second microstrip line including a widened portion; a second ground plane deposited on the second surface of the wafer, said second ground plane including a first extended section and a second extended section adjacent to the widened portion of the second microstrip line and defining a slot therebetween, wherein the first and second extended sections of the second ground plane, the widened portion of the second microstrip line and the slot therebetween define a second co-planar waveguide having a characteristic impedance; a signal via extending through the wafer and being electrically coupled to the widened portion of the first microstrip line and the widened portion of the second microstrip line; at least one ground via extending through the wafer and being electrically coupled to the first ground plane and the second ground plane, wherein the characteristic impedance of the first co-planar waveguide and the second co-planar waveguide provide a substantially constant characteristic impedance between the first microstrip line and the second microstrip line; and a micro-electromechanical switch formed to the wafer relative to the second microstrip line.