Abstract
The presence of glide symmetries in periodic structures can introduce beneficial modifications in their electromagnetic properties. The difference between glide and non-glide periodic structures is due to the distinctive coupling between their constituent sub-unit cells. In this paper, we describe the recent discoveries on the remarkable properties of glide-symmetric periodic structures, which include widened stopbands, reduced dispersion, as well as enhanced anisotropy and magnetic response. These properties are explained through canonical structures simulated with two methods: mode matching and multimode transfer-matrix analysis. We also review the recent use of these distinctive properties for solving technological problems in practical devices such as filters, gap waveguide components, low-leakage flanges, compressed lenses, low-reflected material transitions and leaky-wave antennas with applications in 5G terrestrial communication systems, millimetre-wave satellite systems and automated contactless measurement techniques.
Highlights
Glide symmetry exists in many forms in nature
We demonstrate that glide symmetry does increase the equivalent refractive index, but it reduces the spatial dispersion of the first mode
A second example of this technology can be found in Fig. 8(b), where we show a leaky-wave antenna in groove gap waveguide technology [73]
Summary
Glide symmetry exists in many forms in nature. For example, glide symmetry is found in certain fossils, worms and sea pens [1]. Periodic structures with glide symmetries demonstrated that they possessed distinctive properties in these early works, the research on the topic stagnated for about three decades [7], [8]. It was only when powerful computers became accessible, when commercial software for electromagnetic simulation were broadly available, and when the knowledge and.
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