Folded Empty Substrate Integrated Waveguide With a Robust Transition to Grounded Coplanar Waveguide in the Ku Band

The benefits of empty substrate integrated waveguide (ESIW) are already well-known and contrasted in the literature. Different variations of transitions are available to maximize the power injection in that structure. Besides, several topological variations of the ESIW have also been proposed, such as the ridge ESIW, which enlarges the monomode bandwidth at the cost of higher losses and larger cross-section area. This paper presents a new variation of topology: the folded-ESIW, that halves the width of the original ESIW waveguide and maintains the cross-section area with good performance indexes and a similar bandwidth. A discussion is made about the feasibility of this novel topology and a new transition is presented with a high degree of robustness and a minimum electrical length. To validate and prove this new proposal, a back-to-back prototype has been designed, manufactured and measured, with results so promising that give access to new design strategies in the ESIW field.

[1]  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.

[2]  Angel Belenguer,et al.  Microstrip to Ridge Empty Substrate-Integrated Waveguide Transition for Broadband Microwave Applications , 2020, IEEE Microwave and Wireless Components Letters.

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

[4]  B. Sanz-Izquierdo,et al.  Substrate integrated folded waveguides (SIFW) and filters , 2005, IEEE Microwave and Wireless Components Letters.

[5]  Jean-Marc Duchamp,et al.  Broadband transition from dielectric-filled to air-filled Substrate Integrated Waveguide for low loss and high power handling millimeter-wave Substrate Integrated Circuits , 2014, 2014 IEEE MTT-S International Microwave Symposium (IMS2014).

[6]  Y. Chow,et al.  Analysis and Experiments of Compact Folded Substrate-Integrated Waveguide , 2008, IEEE Transactions on Microwave Theory and Techniques.

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

[8]  Marcos D. Fernandez,et al.  Empty Substrate‐Integrated Waveguides: A Low‐Cost and Low‐Profile Alternative for High‐Performance Microwave Devices , 2020 .

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

[10]  José A. Ballesteros,et al.  Versatile, Error-Tolerant, and Easy to Manufacture Through-Wire Microstrip-to-ESIW Transition , 2020, IEEE Transactions on Microwave Theory and Techniques.

[11]  J. H. Whealton,et al.  Theoretical study of the folded waveguide , 1988 .

[12]  Ke Wu,et al.  Broadband Dielectric-to-Half-Mode Air-Filled Substrate Integrated Waveguide Transition , 2016, IEEE Microwave and Wireless Components Letters.

[13]  W. Hong,et al.  Characterization of the Propagation Properties of the Half-Mode Substrate Integrated Waveguide , 2009, IEEE Transactions on Microwave Theory and Techniques.

[14]  Angel Belenguer,et al.  Empty substrate integrated waveguide technology for E plane high‐frequency and high‐performance circuits , 2017 .

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