An Antenna-Theory Method for Modeling High-Frequency RF Coils: A Segmented Birdcage Example

<table>Current distribution on a center-fed dipole antenna for different antenna’s lengths. <svg height="12.4375" id="M2" style="vertical-align:-0.1638pt" version="1.1" viewbox="0 0 9.5124998 12.4375" width="9.5124998" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
<g transform="matrix(.017,-0,0,-.017,.062,12.162)"><path d="M529 97q-70 -109 -136 -109q-41 0 -56 94q-23 144 -37 284q-38 -88 -99 -202.5t-93 -156.5q-26 -8 -76 -19l-9 21q71 78 145.5 193t124.5 232q-5 84 -15 128q-12 55 -29.5 75.5t-42.5 20.5q-21 0 -45 -13l-8 24q16 17 46 30t55 13q43 0 70 -46.5t40 -169.5
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</svg> is the wavelength of the oscillating current source.</table>

International Journal of Antennas and Propagation

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Figure 1

Figure 1: An Antenna-Theory Method for Modeling High-Frequency RF Coils: A Segmented Birdcage Example 