In despite that many metamaterial designs in the literature are often lossy, total losses are governed by design considerations and material choices rather than anything relative to the resonance. Although the use of resonance necessarily imposes a limit on instantaneous bandwidth, not all metamaterial designs are resonant and broadband devices have been demonstrated in the literature. In addition, if the use of resonance reduces the bandwidth, this expense is accompanied by possible significant performance gains. So, losses and narrow bandwith are not necessary a future of a metamaterial characteristic ?
Not necessarily. The bandwidth will mainly depend on the design of the metamaterial. It all has to do with the single periodic unit cell. The metamaterial literature seems to indicate that the larger the mass of the resonance mechanism in the unit cell, the wider is the associated bandwidth. In addition, the mid-frequency of the band (high or low) plays an important role in determining the width. That is, a narrow bandwidth at low-frequency can be made wider by scaling up the size of the unit cell. Of course, the mid-frequency of the bigger size unit cell will also be higher. There are numerous metamaterial designs with large bandwidths; check these articles for more information:
1\ https://www.nature.com/articles/s41598-019-47644-0
2\ Article Bandgap engineering of three-dimensional phononic crystals i...
3\ Conference Paper Development of an all-optical dimensional measuring system
4\ https://www.nature.com/articles/s41598-019-44507-6
Thank you for your reply Mr. Waiel Elmadih, does the shape (circle, square..) of the unit cell contribute also to the losses or losses depend only on conductor and substrate properties and frequency.
I think that limitation of bandwidth and big losses are limitations only of the current time. I agree with Waiel Elmadih . Bandwidth can be expanded with help of optimization of metamaterials cell design. I have some results in this area, for example:
Presentation Parametric synthesis of 3D structure of SRR element of the m...
On the other hand, dielectric resonators as metamaterials cells can be given very small electromagnetic losses.
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