In case of metamaterial absorbers, the effective electromagnetic parameters such as permittivity and permeability should be equal. What will these values in case of high impedance or artificial magnetic conductor structures?
Hello,
Various possibilities to design artificial magnetic materials for microwave frequencies are considered. Such composites can be used in microwave engineering at frequencies where no natural low-loss magnetic materials are available. Basically, measurement of mue and epsilon tends to more effectively in metamaterials now a days and researcher having with much interest are working in meta-materials for the microwave and optical applications because their electromagnetic properties are vastly different from ordinary materials. Meta-materials are defined as artificial electromagnetic structures which have the negative permittivity and the negative permeability simultaneously in a specific frequency range.There are several ways to measure these parameters.
I am attaching one paper.
Thanks,
Dear Madam,
Thanks a lot for your help.
The attached paper describes the effect of permittivity on the HIS characteristics.
But, my concern is about the values of effective permittivity and permeability (which can be extracted by effective medium theory, which depends on the dielectric and etched patch over the dielectric)- which is different from the permittivity and permeability of substrate.
Any papers/ concepts regarding the same is highly appreciated.
Hello Libi,
I think that for artificial magnetic conductors, the permeability is negative while the pemittivity remains positive in a specific range frequency and we call this kind of materials Mu negative metamaterials (MNG)
Dear Ahmed El Yousfi,
Thanks for your reply.
It will be very helpful if you can share some files related to it.
Dear Libi,
I attach an article that will be helpful for you. in fact, the author gives us a very important explantion of these artificiel materials.
AMC structure is not permittivity or permeability dependent. Moreover, SRR is just a structure which researcher use to get negative mue or negative epsilon just to due to low structure profile as compare to wavelength. For metamaterial either real value of negative mue or negative epsilon is fine.
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