Hasnain Abdullah

Instrument system setup for human radiation waves measurement

In recent years, there has been increasing concern about scientific investigations of the endogenous electromagnetic fields generated by and contained in the human body. The purpose of the research is to investigate a simple portable instrument setup for measurement of human radiation waves. The human radiation frequency is measured using very sensitive body radiation wave detector. The frequency data is analyzed using statistical analysis method of SPSS. The appropriate antenna length and distance of frequency measurement for human radiation wave is established.

Human body radiation wave analysis on the human torso

All living body has been shown to emit radiation into space surrounding their body. The radiation field encloses the physical body and emits the characteristics of frequency radiation. This study discusses the analysis of human body radiation wave on the human torso and compares their frequency characteristics between genders. At first, the characteristic of radiation frequency is determined by employing statistical analysis of correlation and analysis of variance. The results show that the characteristic difference of radiation frequency between males and females in human torso is significant. Then, for the purpose of classification, the k-nearest neighbor is used as classification algorithm. The results show that the proposed technique properly classifies gender with accuracy of 100 percent. Experimental results recommend that the proposed technique is appropriate and capable to classify gender using frequency analysis of the human torso radiation.

Microwave Absorber Coating Material Using Oil Palm Ash

The most important part to be highlighted in developing a reliable microwave absorber is the material used to fabricate the absorber. As an alternative in managing the increase of the oil palm residues throughout the country, this study is focusing on developing a microwave absorber coating using oil palm fly ash. The software uses for design and simulation of microwave absorber is CST Microwave Studio (CST MWS) which enables the fast and accurate analysis of high frequency devices. The simulation design is fabricated to a number of layers which is coated by oil palm ash as a lossy element. The measurement and performance are carried out in the high broadband frequency of 8 to 12 GHz (X-band).

Characteristic Evaluation of Multiple Layers Microwave Absorber Coated with Biomass Composite

Radiation Absorbing Material (RAM) is used to absorb radiations of electromagnetic wave surrounding us. Thus, the multiple layers’ microwave absorber using biomass composite materials could be one of the solutions to address the problem. In order to effectively absorb the radiation of electromagnetic wave, the multiple layers’ absorber is characterized to optimize the performance of the absorber. The characterization is made by varying biomass composite material contents, thickness and other possible considerations. CST Microwave Studio software is first used to design and simulate the multiple layers’ absorber to estimate its performance. Development of multiple layers’ prototype is carried out to test its performance at free space environment. Free space dielectric measurement method is used to determine the value of multiple layers’ absorber dielectric. The dielectric value is then used in CST software in order to make the simulation more precise. Free space arch which is connected to Agilent Analyzer is used to measure absorption of multiple layers’ microwave absorber.

Design of portable mini anechoic chamber using low cost composite absorber

This paper presents the absorber in which it is designed and shaped to absorb incident radio frequency (RF) radiation. The absorber is designed using composite material since the significance of the project is to find a potential solution to construct a low cost anechoic chamber. This model of mini anechoic chamber, which is consisting of the new designed absorber, is portable and small in size so that it is more user friendly. The performance of the designed absorber are compared to commercial absorber available. The absorber that has been developed is a low cost absorber with the absorption rate is 16.6% less compared to the commercial absorber.

Slotted triangle on hollow pyramidal microwave absorber characteristics

This paper presents the performance effect of hollow pyramidal microwave absorber that had been applied with slotted array principle. The Sierpinski triangle was used as the slotted on the hollow pyramidal microwave absorber. This paper includes the theories, simulation and measurement result. The simulation using CST Microwave Studio Suite used to predict the Sierpinski triangle design of microwave absorber performance. Measurement had been done successfully via an arch method at 8 GHz till 12 GHz. From the increasing iteration in Sierpinski triangle principle leads to stable the impedance of absorber and resulting high absorption at frequency range between 11 GHz till 12 GHz.

Preliminary study of palm oil biomass cement based microwave absorber

In order to deal with more and more serious problem of microwave radiation pollution, palm oil biomass cement based microwave absorber is needed in order to prevent the buildings from the microwave radiation coming from telecommunication towers. This paper describes the capability of palm oil biomass waste from palm oil fuel ash (POFA) as an absorbing material in cement based microwave absorber that will affects absorption performance. The simulation using CST Microwave Studio Suite used to predict the design of palm oil biomass cement based microwave absorber performance. The absorption performance for palm oil biomass cement based microwave absorber will be investigated using free space arch reflectivity measurement method at frequency range 8 to 12 GHz. The study includes the comparison on absorption performance of palm oil biomass cement based microwave absorber with commercial flat microwave absorber and commercial concrete brick. This study showed that the replacement of 20% POFA has a good potential to absorb the microwave signal.

Multilayer performance of green biomass coated pyramidal hollow microwave absorber

This paper investigates the performance of multilayer pyramidal hollow green biomass coated absorbing materials. The designed absorber is simulated using CST Microwave Studio. Several experimental evaluations have been executed to investigate the performance of the tested absorber using free space arch measurement method. The frequency between 8 and 12 GHz was selected for performance evaluation. The results show that, the multilayer pyramidal shaped of microwave absorber produces excellent performance results.

Improvement study of the reflectivity for hollow pyramidal shape absorbers

This paper presents an investigation of the reflectivity performance for hollow pyramidal shape microwave absorbers. The pyramidal absorbers used in this study is constructed using four 15cm-pyramidal absorbers stacked on each other to equal the height of one single 45cm-absorber. The wave frequency ranging from 8GHz to 12 GHz was chosen for simulation and measurement of the absorber performance. The reflectivity performances of the stacked pyramidal absorbers were compared to single level pyramidal absorbers in term of their reflectivity performances. The result shows that the stacked pyramidal absorber has higher absorption level an average absorption of −24 dB for the above frequency range.

A pregnant women vest and window curtain as an RF electromagnetic shielding

This paper presents a case study on the health effects of a long-term radio frequency (RF) electromagnetic radiation that are generated from a radio base station (RBS). A questionnaire survey was conducted on a group of people who are staying near an RBS to study the general health effects and to study for any miscarriage effect. An RF signal site measurement was conducted to confirm that the site of the case study is under exposure of the radiation. Based on the measurement and survey results, a practical way to shield or reduce the radiation effect is proposed. An internal vest for pregnant women and a window curtain material for public use are tested, designed and proposed.