Since the absorber technology cannot cover such low frequencies, the concentration of the absorber design goes around 70 MHz test frequencies. The frequency spectrum of RE/RI tests starts from tens of kHz. The electromagnetic compatibility of the electronic devices is mainly considered in two ways, measuring radiated emission (RE) or radiated immunity (RI), where the test procedures are specified in different standards. Finally, the absorber operating frequency extension to the millimeter-wave spectrum using metamaterial structures or graphene material is presented. Then, some practical aspects of designing hybrid absorbers, including the influence of carbon loading and matching layer on their performance, are mentioned. The combination of the ferrite tile and pyramidal dielectric absorbers is also provided. Later, different kinds of pyramidal absorbers, commonly used in the broadband microwave frequency range (above 1 GHz), are presented, and analytical and numerical approaches for predicting their performance are reviewed. This chapter introduces the analysis and modeling of ferrite-based absorbers for low-frequency applications (below 1 GHz) and discusses the issues encountered in their installation, resulting in air gaps. Depending on the frequency range of interest, different types of absorbers can be utilized for this purpose. Absorbers are one of the key components in the realm of electromagnetic compatibility.
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