To mitigate electromagnetic wave interference in high field MRI, RF shimming relies on the ability to manipulate the phase and amplitude of the Tx signal on each channel. The simplest approach is to change phase shifts by switching transmission lines. We propose an electronically controlled phase shifter providing eight different states of phase shifting (0°, 22.5°…...135°, 157.5°), designed to handle 1kW Tx power and is non-magnetic so that it can be used in the magnet room. Measurement demonstrate an average insertion loss of -0.94dB and an average phase error -1.35° compared with design values.
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