Design and performance of a double-tuned bird-cage coil |
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| Institution: | 1. National Centre of Experimental Mineralogy and Petrology, University of Allahabad, Allahabad, U.P., India 211002;2. Laboratório de Biopolímeros e Sensores, Instituto de Macromoléculas, Universidade Federal do Rio de Janeiro (LABIOS/IMA/UFRJ), Rio de Janeiro, Brazil;1. DEM-ISEP, Instituto Politecnico do Porto, Porto, Portugal;2. IDMEC, Instituto Superior Tecnico, Universidade de Lisboa, Lisboa, Portugal;3. Institute of Fundamentals of Machinery Design, Faculty of Mechanical Engineering, Silesian University of Technology, Gliwice, Poland |
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| Abstract: | The “high-pass” and “low-pass” designations commonly given to bird-cage coils derive in each case from the relationship of the individual sections of the bird cage to simple filters. By extension of the concept of constructing a bird-cage coil from elementary filter sections, it is possible to create coils which support “bird-cage mode” resonances at more than one frequency. Designs based on both simple bandpass and band-stop filters, for example, provide means to realize bird-cage coils which may be tuned simultaneously to two frequencies. Construction and performance of a band-stop bird cage operating at both 200 and 81 MHz are described. |
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