BroadbandBroadband absorbersAbsorber are advanced materials designed to minimize undesired EMElectromagnetic interference by absorbing specific frequencyFrequency ranges. These absorbers combine FSSs to resonate at certain frequencies, and broadband absorptivity response is achieved by introducing lossy elements into these structures. FSS absorbers are fabricated by arranging conductive elements in periodicPeriodic arrays over dielectricDielectric substratesDielectric substrate, with the aim of improving absorption properties across a wide range of frequencies. The high Q plasmonic resonanceResonance restricts the absorptionAbsorption bandwidthAbsorption bandwidth, and the inclusion of numerous resonators leads to the emergence of other absorption bands. To do this, the shape and arrangement of the FSS elements, such as patches, slots, or dipolesDipoles, are optimized in order to provide many resonanceResonance locations and minimize reflection. The resulting metasurfaceMetasurface possesses a significant capacity to absorb EM waves effectively over a broad frequencyFrequency range. This characteristic renders them appropriate for use in fields like stealth technology, EMC, and RCS reduction in both military and civilian contexts. The absorber’s performance is optimized using advanced design approaches such as numerical simulations and optimization algorithms, which ensures little reflectionReflection and transmissionTransmission. The emergence of broadbandBroadband absorbers signifies notable progress in managing EMI, providing adaptable and efficient remedies for contemporary RF communicationCommunication and radarRadar systems. In this chapter, the design procedure of different microwaveMicrowave absorbersMicrowave absorbers is investigated.