**3. Conclusions**

Depending on the frequency range of interest, different absorber types have been commonly used for EMC applications. For the sub-1 GHz range, the magnetic losses of unbiased ferrite tiles or grids are the main mechanism for electromagnetic absorption. Moreover, pyramidal absorbers fabricated by organic, electric, or magnetic materials have been exploited frequently in microwave frequencies. Considering the coverage of both spectrums mentioned above, efficiently designed hybrid absorbers, using both technologies simultaneously, have been proposed. They have been achieved by controlling dielectric pyramidal absorbers' carbon loading and tip truncation or by designing a matching layer between the two absorbing sections. Finally, in the millimeter-wave regime, metamaterial absorbers have been proposed for providing the measurement setups of ever-growing high-frequency applications, such as 5G communication. The one-atom-thick graphene material also has great potential for this purpose.

#### **Acknowledgements**

The author would like to thank ETS-Lindgren Company for guiding through the use of necessary sources.

### **Conflict of interest**

The authors declare no conflict of interest.

*Recent Topics in Electromagnetic Compatibility*
