Siti Nurzulaiha binti Isa

Year & Semester: 2017/2018/1/2

Siti Nurzulaiha binti Isa was the first Master by Coursework student that was assigned under my supervision. I had assigned her to conduct a research topic on metamaterial absorber, focusing on the development of new structure of Electromagnetic (EM) absorber which has certain degree of flexibility. The absorber 's design was based on the textile material which is in nature, a flexible material. This research was the beginning of having an EM absorber material that can be applied on body. Throughout the course, Siti Nurzulaiha was very independent student, very hardworking and competent. She managed to graduate on time (GOT) with excellent results. In addition, she managed to publish her work in the 3rd International Conference on Electric, Electronic, Communication, and Control (ICEECC 2018) in Johor Bahru with a paper entitle 'Floral Structure for Textile-based Metamaterial Absorber'.

Project Abstract:

X-BAND METAMATERIAL ABSORBER FOR ANTI-MOTION DETECTOR

A motion detector is a device designed for sense motion, particularly humans for security and surveillance purpose. The counter-product of a detector is an absorber. Applied for various modern military and civil technologies, the study of absorber has been expanded to a very wide area, including in metamaterials. This paper will discuss on an X-Band Metamaterial Absorber (MMAs) designed for anti-motion detector operating at 10.525 GHz. The proposed MMAs is aiming to achieve a maximum absorptivity that at least 90% of the electromagnetic radiation absorbed. It is expected to have wider operating angle that can be extended at least 60. The design is aspired to reach a very high degree of insensitivity involving polarization through a series of simulation. By using CST Software, the absorber is designed from an orthodox pattern of annulled circle per unit block, which consists of textile-based substrate in between a metal-based ground plate and a top structure. The structure is then simulated in unit cell to determine the maximum absorptivity through a simple design. Through a series of calculation and observation, the parametric study of the structure is implemented, and from that point, the complication of the pattern is increased so that the maximum absorptivity can be accomplished. Some of the parameters concerned are width of the circle, size of a unit cell and angle of operation. As to consider the flexibility of the absorber, the bend factor of the MMAs is also applied in the simulation. The final design will be decided from the highest absorptivity attained in the series of simulation. The MMAs is expected to be flexible enough to be applied as wearable electromagnetic absorber that is sustainable in terms of absorbing electromagnetic wave from most of the definite directions.