Abstract
This study presents a novel design of a high impedance surface (HIS) to improve the magnetic field strength of a radio frequency (RF) coil at 63.8 MHz, suitable for 1.5 T magnetic resonance imaging systems. The HIS is miniaturised using distributed interdigital capacitors. A HIS with an electrically small unit cell (λ /94) and is positioned between a RF transmit-receive coil and an RF shield. The magnitude of the magnetic field from an RF coil when coupled to a dielectric phantom load (mimicking a biological sample) was estimated using numerical simulation (finite integral methods) and corroborated with measurements. Simulated median improvements in magnetic field inside a dielectric phantom range from approximately 18 to 32% depending on the area of the HIS.
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