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Simulated biotissues have been developed which are appropriate for dosimetry studies at X-band frequencies and for S-band modeling experiments which would use miniature phantoms at X-band frequencies. A short-circuited waveguide system has been built and tested for the precise measurement of the dielectric properties of the simulated tissue. Modifications of composition for varying the dielectric properties over a wide range have been found. The specific heats of the materials have been measured and are approximately the same as the tissues they represent.