Microwave absorber is commonly used in defense, electromagnetic compatibility (EMC)/electromagnetic interference (EMI) reduction and anechoic chamber application. Conventional electromagnetic (EM) absorbers have some constraints in practical handling due to its heavy weight. In this paper, the research focuses on the development of high performance and lightweight microwave absorber. A lightweight and simple design configuration of different rectangular slot size array implemented on hollow pyramidal microwave absorber are carried out. There are two different designs of different slot size array calculated based on 3GHz, 6GHz and 9GHz frequency slot size. The two designs have an opposite slots size array arrangement namely different slot size 3GHz, 6GHz, 9GHz order design array and different slot size 9GHz, 6GHz, 3GHz order design array. The absorption is measured using the Naval Research Laboratory (NRL) arch free space method in the frequency range of 1GHz to 12GHz covering L, S, C and X band. In the measurement result, the maximum absorption performance is obtained by the different slot size 9GHz, 6GHz, 3GHz order design array which is up to -44.23dB at X-band. The measurement results for both designs array show good absorption performance which exhibit below than -20dB especially at high frequency band. The proposed designs have been identified as the new approach to increase absorption improvement over a broad frequency range application.
In recent year, the development of the electronic devices is rapidly growing and that was used in entire world but electronic devices generate the electromagnetic wave (EM) radiation. That radiation can affect the people’s health and interference normal operation of other electronic devices. Hence the researchers have conducted studies in the field of microwave absorption to reduce the risk of electromagnetic (EM) radiation. Microwave absorber comes with many form and material to enhance the absorption performance. This study aims to improve absorption performance of pyramidal geopolymer microwave absorber by using slotted design. The slotted design used on pyramidal geopolymer microwave absorber is triangular shape and that shape was isosceles triangle type. The hollow pyramidal was coated with a geopolymer absorbing material to form hollow pyramidal microwave absorber. Geopolymers are formed by a process called geopolymerization, which involves the chemical bonding of the ingredients together. This study used sodium silicate (Na2SiO3), sodium hydroxide (NaOH), and Powder Activated Carbon (PAC) to make geopolymer absorbing material. Measurement had been done successfully via far field measurement using arch method at 1 GHz to 12 GHz. The absorptivity of hollow pyramidal triangular slotted geopolymer microwave absorber is observed at each frequency band covering the L, S, C and X bands. The result is compared with their maximum absorption in each frequency band and also shows geopolymer material produces good absorption performance. The result shows triangular slotted design is capable of achieving very high absorption performance which is -26.32 dB.
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