Abstract
In this paper two different simple to design and easy to manufacturing transitions from a microstrip to rectangular waveguide based on ridge and groove gap waveguides are studied. The first one is based on a combination of a groove and ridge gap waveguide. In this case, the microstrip substrate occupies the whole bottom metallic housing block, namely, the transition and the gap between the bed of nails and the lid; therefore, it does not require any substrate shaping. Nevertheless, the transition needs to replace groove waveguide by ridge gap waveguide sections to avoid higher-order mode excitation. In the second approach, based on only a groove gap waveguide, the substrate is shaped to be only in the microstrip section, that is, outside the bed of nails area. This leads to a simplification of the design procedure. Prototypes of both transitions have been characterized, showing good agreement with the simulations taking into account the manufacturing tolerances. Performance comparable to the state-of-the-art in this frequency band has been achieved.
Highlights
Gap waveguide technology-based components have been getting a lot of attention in the last few years [1,2]
The first structure consists of a Chebyshev transformer implemented using ridge and groove gap waveguide sections, which are partially filled by the microstrip line dielectric substrate
A perspective view of the Chebyshev transformer and a top view of the microstrip to ridge gap waveguide transition are shown in Figures 5 and 6
Summary
Gap waveguide technology-based components have been getting a lot of attention in the last few years [1,2]. Such a property has been successfully used for microwave and millimeter wave circuit packaging, avoiding resonances which could degrade their performance [5,6,7] Taking this structure as the baseline, waveguides can be created if an air channel is formed in between two bed of nail sections, which behave as high impedance surfaces and forbid electromagnetic wave propagation in any direction other than the air channel formed in between them. This channel can have different forms, depending on its height, its section and the presence of a dielectric substrate, leading to different types of waveguides [8,9,10].
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