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Design of Dual Circularly Polarized Inclined Slot Pair Based on Stepped-Height Ridge Gap Waveguide with Series Excitation

This paper presents a new stepped-height ridge structure to reduce the guided wavelength of a conventional ridge gap waveguide. Compared to other technology, the stepped-height ridge gap waveguide avoids dielectric loss and reduces the cost of manufacture. The simulation results prove that the guided wavelength could be decreased significantly by adjusting the step numbers and step depth. Based on this structure, a dual circularly polarized inclined slot pair is investigated and simulated. The slot pair is located on the top plate of the ridge gap waveguide and is fed by a traveling wave. The simulation results show that the inclined slot pair could generate a good dual circular polarization with the axial ratio below 3 dB over 76-81 GHz. The discrete models of the inclined slot pair are also shown in this paper.