Abstract
Radio transparency of polycrystalline CVD-diamond disks with diameter up to 75 mm in millimeter-wave range was measured by free-space method. The structure of the disks was characterized by Raman spectroscopy and scanning electron microscopy. Dielectric loss tangent of the samples in the frequency range of 50-67 GHz was found to be in the range of 7.5· 10-3-8· 10-2, increasing with frequency. The transmission loss due to the radiation absorption is about 1%. Keywords: millimeter-waves, polycrystalline diamond, radio transparency.
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