Excitation of the First High-Order Mode in Ridge Gap Waveguide

Abstract

In this chapter, a method to excite the first higher-order mode of the ridge gap waveguide (RGW) is introduced. The fundamental mode of the RGW is well studied in a lot of papers, while the higher-order modes are ignored. However, they have some good properties that make them suitable for specific applications. The higher-order modes can exist by having a ridgeline. In the proposed work, the excitation of the first higher-order modes is achieved by having an L transition and vias that convert the fundamental quasi-TEM mode of the RGW to the first higher-order mode (first odd mode) and suppress the even modes. The proposed transition has a simple configuration and is designed by using metallic (RGW) technology. The proposed structure is simulated using a full wave simulator (CST Microwave Studio).