Closely-Spaced Groove Gap Waveguides with Reduced Coupling

In this communication, novel Gap Waveguide (GW) versions are presented with the objective of minimizing coupling. These innovations stem from minor modifications to conventional GW designs. As a result of this reduced coupling, it becomes possible to achieve channel spacing below half of a wavelength. Simulated results indicate that the Inverted Imbricated Groove Gap Waveguide and the Fingerprinted Groove Gap Waveguide both demonstrate an isolation level between channels exceeding 35 dB within the target bandwidth of 28 to 32 GHz. This design is noteworthy for its straightforward fabrication process, offering the potential for miniaturization and allowing for arrays with a spacing of less than a half of a wavelength.