Summary
International Symposium on Antennas and Propagation
2010
Session Number:3TD2
Session:
Number:3TD2-5
Reflection Loss Performance of Triangular Microwave Absorber
H. Nornikman, F. Malek, P.J Soh, A.A.H Azremi, A. Ismahayati,
pp.-
Publication Date:2010/11/23
Online ISSN:2188-5079
Summary:
In recent years, electromagnetic absorbing materials have been increasingly important in ensuring successfully of RF anechoic chamber testing performance. Various researches on enhanced absorber technology have been applied in the testing industry today. Absorbers are one of the main components in an anechoic chamber which is critical in eliminating reflected signals. There are two common absorber categories in the electromagnetic wave range, which is in the microwave range (1 GHz to 300 GHz) and lower frequency range (30 MHz to 1000 MHz). Microwave absorbing materials that are being used in anechoic chambers such as polyurethane and polystyrene are able to reduce reflections of high frequency energy. The usefulness of these microwave absorbers are dependent on testing scopes, either in telecommunication, military, high speed electronics or automotive. Absorber shape is the main parameter that affects the performance of microwave absorbers. The example shapes are layer type absorber, pyramid, wedge, walkway, convoluted, and oblique absorber. Pyramidal shape absorbers are commonly used for the frequency range between 1 GHz and 40 GHz. In this paper, a new shape absorber is introducing to improve the reflection loss performance compare to the existing shape. The important thing before selected the material is the dielectric constant and tangent loss of the material. This parameter also can give larger impact to the reflection loss performance. The dielectric constant is a characteristic quantity of a given dielectric substance, sometimes called the relative permittivity. Dielectric constant is defined as the relative permittivity (εr) or the absolute permittivity (ε) relative to the permittivity of free space (ε0). [1] This tangent loss is refers to the dissipation of power or energy from incident waves. [2]