Study of the characteristic of gap waveguide and comparison with rectangular waveguide

Abstract

This paper presents the design and experimental verification of the ridge gap waveguide, appearing in the gap between parallel metal plates. It also describes the basic ideas of how local waveguides and transmission lines can propagate along desired paths in the air gap between two metal surfaces. The principle of operation is related to the performance of artificial magnetic conductors, AMC surfaces and soft and hard surfaces. And by evaluating the quality factor, a study and quantification of losses in ridge gap waveguide compared to losses in ideal standard rectangular waveguide is also presented.

Gap Waveguide Topology With Reduced Height Pins for Millimeter-Wave Components

“…Taking into account previous considerations, the frequency performance achieved by the GGW is similar to the rectangular waveguide [7,8] but with manufacturing advantages. As previously mentioned, it avoids the contact and also the alignment between the different parts of the device.…”

“…Recently, several alternatives to the conventional GGW topology were proposed to simplify it [8À13]. For example, different pin shapes can be used: circular [8]; square [1]; pyramidal [9]; conical [10]; and even half-height pins [12,13]. As in the conventional topology, a pin height similar to λ/4 is used in [8À11].…”

Novel Design Method for Millimeter-Wave Gap Waveguide Low-Pass Filters Using Advanced Manufacturing Techniques

“…The main advantage of the GGW is that it allows the wave propagation along the channel defined by W and L in Fig. 1, with a similar performance as a rectangular waveguide of width W and height L, as explained in [7], [8]. Using this technology, several devices have been reported, for instance antennas [9]- [11] or bandpass filters based on coupled resonators [12]- [14].…”