HMIC stands for Heterolithic Microwave Integrated Circuit. In comparison to Monolithic Microwave Integrated Circuits, the Monolithic term means “one material” whereas Heterolithic is defined as “different material”. In the case of HMIC, MACOM joins the two materials Silicon and Glass, and as a result takes advantage of the desirable microwave properties of each. For glass, the low dielectric constant and loss tangent for superior high frequency performance. For silicon, the high thermal conductivity and low resistance for higher power and low insertion loss characteristic.