Performance Analysis of Single, Double and Triple Rings as Absorber

The study discusses the modelling and the performance analysis of the single, double and triple rings as an absorber. The absorber has been modelled by Fr-4 substrate sandwiched between copper-based rings and ground. The single ring provides absorption of 90.2% at 10.5GHz with Q-factor of 728. The double ring structure provides the maximum absorption of 95.5% and 92.5% at 7.6 GHz and 10.5GHz respectively. The proposed double ring model works as a dualband absorber with Q-factor of 781. The triple ring model provides the maximum absorption of 99.9%, 92.5% and 90.2% at 2GHz, 4.9GHz and 7.1GHz respectively. The proposed triple ring model exhibits as a triple-band absorber with Q-factor of 775. surface current distribution shows the impedance matching of the system with air that increases the overall absorptivity of the system. Hence the proposed model can be used in many applications such as security systems, sensors and medical imaging technology.