Find Magnetic and Dielectric Materials with Desired Properties

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Hi all,
I'm trying to find which magnetic materials can operate without too much losses at about 2.45 GHz and have little relative magnetic permeability, i.e., in the range 15-35.

About the same for dielectric materials, with a relative electric permittivity in the range 2-7.

Moreover, I ask if a magnetic material designed as a substrate for a planar antenna (cylindrical shape) may be used without having been magnetized first. I think the only difference in using it magnetized near the remanence region would be in relative permeability.

Thanks for the reply
 

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