Coplanar waveguide(CPW) that which is originated from microstrip is an important planar transmission line of microwave. With the development of microwave and millimeter-wave integrated circuits, especially of monolithic microwave integrated circuits, there is a great interest in the coplanar waveguide in recent years. Coplanar waveguides(CPW's) offer several advantages over conventional microstrips, these include the simplification of the circuit fabrication process, ease of parallel and series i...