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Monolithic integrated Impatt diodes are combined with coplanar waveguide resonator on unthinned silicon wafers to form simple oscillators for mm-wave operation (around 90GHz). This paper describes properties of planar IMPATTs, their integration into SIMMWICs and proves their basics functionality as mW power sources for simple cost effective and flexible mm-wave systems.

The paper presents a numerical and experimental study of focussing by the negative-index effect in twodimensional photonic crystals in a high-index-contrast slab waveguide. The simulations and experiments are carried out at 21.5 GHz in a Rogers TMM10-(Thermoset ceramic loaded plastic) Teflon material system. It has about the same index contrast as the Si-SiO 2 material system which is used for photonic integrated circuits at 1550 nm (193 THz) wavelength. The Si-SiO 2 material system is represented by the TMM10-Teflon system by scaling the dimensions with a factor of 10 4 .

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