ABSTRACT
Sapphire is a new class of robust DRA. The dielectric constant of sapphire used in DRAs has relative permittivity from 9 to 11.5. These DRAs are extremely useful for biomedical applications. An aperture coupled two-layer stacked rectangular dielectric resonator antenna structure design consisting of sapphire and TMM stack has been developed. It has 10 (relative permittivity). The DRA developed is rugged, resistant to physical change and chemical erosion, very stable and possesses hardness. The software high-frequency structure simulator (HFSS) has been employed to simulate antenna design. The prototype of the antenna has been designed and tested in anechoic chamber environments using 40 GHz VNA (vector network analyzer). Sapphire is corundum, a crystalline form of aluminum oxide (Al2O3). It contains traces of iron, titanium, vanadium and chromium. Sapphire DRAs can be used from 0.5 to 4.5 micrometer wavelengths.
