FDTD analysis of a new transition from coplanar waveguide to rectangular waveguide

A rectangular waveguide fed by a grounded coplanar waveguide (GCPW) is inve stigated using the finite-difference time-domain (FDTD) method. A patch is used to couple energy ro the rectangular waveguide (RW) by placing the wave guide opening around the patch. The coupling from the GCPW to the patch is accomplished via an open end. For a IO dB rerum loss, a relative bandwidth of 14% is obtained for a GCPW-to-RW transition. A back-to-back GCPW-to-RW t ransition is analyzed, and is found to have good insertion-loss characteris tics, which verifies that power is indeed coupling to the waveguide, (C) 20 01 John Wiley & Sons, Inc.