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This paper presents a reflective capacitive impedance surface combined with a radio frequency loop coil to improve the radio frequency magnetic field for 1.5 Tesla magnetic resonance imaging applications. The proposed structure is based on a miniaturized surface unit cell using an inter digital capacitance approach. Full field simulations employing an inter digital frequency selective surface shows...
This paper investigates the use of High Impedance Surfaces (HIS) to enhance the magnetic near-field within a dielectric phantom stimulated by a surface coil antenna resonating at 63.8 MHz for use in Magnetic Resonance Imaging (MRI) systems. Specifically, the optimization of the space between the surface of the coil and the HIS is presented here. The HIS incorporates interdigitated capacitive elements...
A new design for metamaterial absorber with triple band in X band range is proposed for Radar cross section reduction in stealth technology. The proposed metamaterial absorber has the advantage of ease design. It is a three layered structure, designed with modified ring resonators printed on a dielectric material with a metal ground. By proper tuning of the geometry parameters of the structure, a...
This paper presents bandpass filter designs using a star type loop resonator. Both single mode and dual mode microstrip filters are designed. A small triangular patch element is used to perturb the fields and couple the dual degenerate modes for constructing dual mode bandpass filter. Two single mode filters are designed and results show chebyshev like characteristics. The dual mode filter exhibits...
Dipole antennas and their arrays are widely used in most of the communication applications. The analysis and synthesis of the arrays becomes simple, if the coupling is neglected as in the case of classical array theory. However, in the case of arrays of wire antennas there exists mutual coupling between the adjacent elements of the array. Moreover, the radiation properties of the array with such widely...
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