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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....
A virtual laboratory experiment has gradually growing on demand as preferable technical exposure method in many universities. This is due to time, facilities, cost and location limitation. This study focuses on the architecture, performance and effectiveness of a web-based laboratory in assisting students to relate theoretical knowledge learnt during lecture session with real application. With the...
An anechoic chamber is considered good when there is no signal reflection inside the chamber and also when there is no incoming signal from outside the chamber. The key element inside an anechoic chamber is the absorbing material. The evaluations of mini anechoic chamber fitted with coated absorbers were carried out by analyzing the absorption performance. The study includes the comparison of measurement...
This article refers to the design technique related to the cross-section absorption properties of the materials absorbing electromagnetic waves. The methodology of construction of absorber, measurements of microwave absorption, description of the original laboratory set-up for measuring the absorption characteristics of the examined materials as a function of the shape of the absorber and the testing...
This paper investigates the capability of oil palm ash paint as green-absorbing material in a way to absorb microwave radiations. The paint is coated on three different wall materials which are elephant board, plywood and cement. The absorb performance of the paint is observed using the simulation result of Computer Simulation Technology (CST) Microwave Studio software. Meanwhile, the exact performance...
The investigation of oil palm ash microwave absorbers involves the design, simulation and fabrication of an effective broadband frequency for anechoic chamber. The resistive and magnetic materials in the oil palm ash compose its potential to be used as microwave absorbing materials. These oil palm ash absorbers are simulated using CST Microwave Studio. The arch measurement is executed to investigate...
This paper is discusses on the designing of helical antenna in the High Frequency (HF) range from 3 MHz to 30 MHz. The software used for the simulation is the CST Microwave Studio (CST MWS) which is an analytical tool that provides an accurate 3D EM simulation results for high frequency design. Several parameters dimension and helical's profiles were studied in order to obtained a suitable resonance...
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