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July 2007 [Components] Sliced Coaxial Cables Form Compact Couplers Coupled sliced coaxial cables can provide signal coupling in a compact form factor for 50and 75-W systems. With the ready availability of accurate computer-aided-engineering (CAE) tools, it is possible to apply some basic formulas for calculating the dimensions of these structures to achieve a desired amount of coupling on different substrate materials. What follows is a straightforward approach to calculating those dimensions and analyzing coupler designs fabricated with coupled... March 2007 [Components] Design Coupled Microstrip Resonators For MRI Magnetic-resonance-imaging (MRI) systems for medical and scientific applications require a high-performance, high-power inductor capable of establishing a uniformly strong magnetic field. The transverse-electromagnetic (TEM) resonator1 has received a great deal of attention recently as a superior replacement for standard birdcage coils2 in MRI applications requiring magnetic field levels of 4.7 to 9.4 T. For example, at operating frequencies of 200... |
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