When in past i worked with SDR hardware i experimental that noise line in space is about -100dB, when i don’t amplify RF gain, when i amplify it, it is -80dB till -20dB. So other hand when i use different antenna pick value of noise is change, today i know that a antenna is a dipole network that can describe with scattering matrix.

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In this post i want to discuss about what’s best material for plasmonic device application except  considering graphene. I want to find a materials with low loss, high confinement and easy fabrication.

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And older story in microwave and THz  or higher frequency range is finding a way that we have high effieceincy coupling. So i will discuss about mechanism coupling and phase and impedance matching.

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In this blog post we want to discuss about a S-Paramter of a waveguide. We know that in Microwave we use S-Parameter for descriping these deveices.

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