Abstract
A compact artificial magnetic conductor (AMC) structure for the application of specific absorption rate (SAR) reduction is presented in this paper. A magneto-dielectric (MD) structure as a host of AMC substrate is used to miniaturize the AMC size. The magneto-dielectric has been designed with a low-profile spiral loop in a way to have a high permittivity and permeability for the desired center frequency of 3.5 GHz. Simulation results confirm the zero-degree reflection phase of the proposed AMC unit cell. Moreover, a 70% reduction has been achieved in comparison to the conventional AMC. To validate the simulation results, a prototype of the board is fabricated and measured with a coplanar waveguide (CPW) antenna for the reflection coefficient. The measurement results display an excellent agreement with the simulation ones. A VOXEL model of a human body is utilized to determine the SAR value of the proposed structure. Considering the maximum SAR value for an average of 10 g human tissue, more than 70% SAR reduction is verified for the CPW antenna with the recommended MD-AMC structure compared to a conventional single CPW antenna.
Highlights
The wireless systems revolution has generated a wave of innovative results that dramatically expand the availability of voice and data almost anywhere
Apart from numerous miniaturization techniques on the patch antenna design [17,18,19], in this paper, we focused on substrate miniaturization
The coplanar waveguide (CPW) antenna is placed 6 mm above the MD-artificial magnetic conductor (AMC) using Rohacell foam, which has a permittivity of εr = 1.006
Summary
The wireless systems revolution has generated a wave of innovative results that dramatically expand the availability of voice and data almost anywhere. While the idea of inserting a PEC between the human head and the mobile antenna is a simple technique that can eliminate the EM wave of the antenna toward the human head, it faces a principal problem of the quarter of wavelength separation requirement Among all these approaches, Artificial Magnetic Conductor (AMC) can be an alternative for PEC to achieve our purposes, as it can act as a perfect magnetic conductor (PMC) at particular frequency bands. Most of the meta-substrate used for the antenna design has been employed with metamaterial spiral loops, which makes the whole structure high profile In this configuration, a novel low-profile MD cell is used as a meta-substrate of a conventional AMC to reduce the total size. Simulation results show that 70% overall size reduction is obtained with the aforementioned design
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