Effect of Slot Array at Different Angles towards the Performance of Hollow Pyramidal Microwave Absorber

Abstract

This paper presents the performance of electromagnetic wave absorption at different angles with novel slot array design implemented on hollow pyramidal microwave absorber. The size of pyramidal shaped absorber is selected to comply with the industrial standard and can operate at the frequency range between 1 GHz to 12 GHz. Initially, six designs slot array on hollow pyramidal microwave absorber are fabricated using biomass carbon. Their electromagnetic wave absorption at 0˚, 30˚ and 60˚ angles are measured to analyze their performance. The performance results show that the absorption rates are sensitive to angle of measurement.  The observation shows that the designs of slot array at S, C and X frequency bands give better absorption performance of up to 60˚. The overall results for all slot array design at different angles are analyzed and compared.