Ultra-Wideband CPW-to-Substrate Integrated Waveguide Transition Using an Elevated-CPW Section

In this letter, an elevated-coplanar waveguide (ECPW) is proposed for an intermediate section of a coplanar waveguide (CPW)-to-substrate integrated waveguide (SIW) transition. The ECPW is used to attain a gradual mode matching and to achieve the consequent wide bandwidth. The measurement results show 70% fractional bandwidth at 10 dB return loss and 0.9 dB insertion loss from 19 to 40 GHz. We expect that the proposed SIW transition plays an important role for the integration of high-Q SIW with CPW circuits, such as millimeter-wave system-in-package (SiP) using SIW circuits.

[1]  Ke Wu,et al.  Integrated transition of coplanar to rectangular waveguides , 2001, 2001 IEEE MTT-S International Microwave Sympsoium Digest (Cat. No.01CH37157).

[2]  Ke Wu,et al.  Guided-wave and leakage characteristics of substrate integrated waveguide , 2005, IMS 2005.

[3]  George E. Ponchak,et al.  A new rectangular waveguide to coplanar waveguide transition , 1990, IEEE International Digest on Microwave Symposium.

[4]  T. Chiu,et al.  A building-block design scheme for planar transmission-line transitions , 2003 .

[5]  K. Wu,et al.  Integrated microstrip and rectangular waveguide in planar form , 2001, IEEE Microwave and Wireless Components Letters.

[6]  Ke Wu,et al.  Single-substrate integration technique of planar circuits and waveguide filters , 2003 .