Experimental Investigation on Absorption Power of Electromagnetic Wave Absorber Based on Patch Pattern

This paper presents the experimental investigation of electromagnetics (EM) wave absorber based on patch pattern to analyze its absorption power. Three different patch patterns of EM wave absorber were used in the investigation, namely square resonator pattern, ring resonator pattern, and split ring resonator pattern. The investigation was performed in an anechoic chamber using a horn antenna connected to a Vector Network Analyzer (VNA) to measure reflected wave from the proposed EM wave absorber. The horn antenna and the measured EM wave absorber was separated around 1.5 m to comply a far-field region of measurement. At the frequency of 3 GHz, the absorption powers in an ideal condition for the EM wave absorber with square resonator pattern, ring resonator pattern, and split ring resonator pattern are −12.05 dB, −14.33 dB and −14.26 dB, respectively. The investigation results showed that the realized EM wave absorber with ring resonator pattern has better total impedance compared to other patterns indicated by the value of absorption power.