I am working on EMI shielding polymer composite.How would i interpret the reflection loss (why taken negative) and then calculate the available band width for the individual component?
Needs suggestions in this regard.
In fact, for calculating the EMI shielding effectiveness of polymer nanocomposites, you need to define first your application bandwidth. For instance you may need to look into the effectiveness of you fabricated composite for an electronic application that falls in the range of 2-20 GHz (Which are many). This bandwidth is categorized into to different bands as well such as Short (S-band: 2-4 GHz), Compromise (C-band: 4-8 GHz), Cross (X-band: 8-12 GHz), Kurz under (Ku-band: 12-18 GHz),...etc.
Then you need simply to measure the electromagnetic properties of your sample including permitting, dielectric loss, permeability and magnetic loss, and use them to find he reflection loss according to the equation provided by the following paper link.
Article Preparation, Thermal, Magnetic and Microwave Absorption Prop...
Article Electromagnetic and Absorption Properties of Some Microwave Absorbers
Article Magnetic and microwave absorbing properties of magnetite–the...
The reflection loss of your materials must be negative as the curve suggests the the word loss indicates and tells you how much of electromagnetic energy is absorbed in your material or lost as a reflection. The lower or minimum values of reflection attained, the better your polymer nancomposite in absorbing EM wave energy.
Hi. You must convert reflection loss to percent. Its equation is logaritmic.
Consider this values:
-10 dB = 90% of absorbance
-20 dB = 99% of absorbance
-30 dB = 99.9% of absorbance
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