Microstrip to Ridge Empty Substrate-Integrated Waveguide Transition for Broadband Microwave Applications

The empty substrate-integrated waveguide (SIW) (ESIW) is an evolution of the SIW. Just as the SIW, the ESIW is of low cost and low profile, and can be integrated into a printed circuit board, but the losses in the ESIW are lower than in those in the SIW thanks to the removal of the dielectric material, which results in ESIW devices with performances close to those implemented with standard rectangular waveguides. In order to increase the operational (monomode) bandwidth of the rectangular waveguides, a metal ridge can be inserted (leading to the ridge waveguide). Extrapolating this idea to the ESIW, in this letter, a study of possible ridge ESIW (RESIW) geometries has been performed, and a novel transition from microstrip line to RESIW is proposed. In order to validate the performance of transition, a back-to-back prototype has been manufactured and measured.

[1]  Marcos D. Fernandez,et al.  Design of a Hybrid Directional Coupler in Empty Substrate Integrated Waveguide (ESIW) , 2015, IEEE Microwave and Wireless Components Letters.

[2]  Á. Belenguer,et al.  Highly Reliable and Repeatable Soldering Technique for Assembling Empty Substrate Integrated Waveguide Devices , 2019, IEEE Transactions on Components, Packaging and Manufacturing Technology.

[3]  Jin-ping Xu,et al.  Wideband Transition From Microstrip Line-to- Empty Substrate-Integrated Waveguide Without Sharp Dielectric Taper , 2019, IEEE Microwave and Wireless Components Letters.

[4]  Marcos D. Fernandez,et al.  Compact Multilayer Filter in Empty Substrate Integrated Waveguide With Transmission Zeros , 2018, IEEE Transactions on Microwave Theory and Techniques.

[5]  Yi Wang,et al.  Micromachined rectangular coaxial line to ridge waveguide transition , 2009, 2009 IEEE 10th Annual Wireless and Microwave Technology Conference.

[6]  Á. Belenguer,et al.  Integration of a Very High Quality Factor Filter in Empty Substrate-Integrated Waveguide at $Q$ -Band , 2018, IEEE Microwave and Wireless Components Letters.

[7]  Á. Belenguer,et al.  Novel Empty Substrate Integrated Waveguide for High-Performance Microwave Integrated Circuits , 2014, IEEE Transactions on Microwave Theory and Techniques.

[8]  Nathan Marcuvitz.  Waveguide Handbook , 1951 .

[9]  Angel Belenguer,et al.  Improved Low Reflection Transition From Microstrip Line to Empty Substrate-Integrated Waveguide , 2017, IEEE Microwave and Wireless Components Letters.

[10]  S. Hopfer,et al.  The Design of Ridged Waveguides , 1955 .

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