Low-temperature cofired ceramics (LTCC) is a multilayer substrate manufacture technology which demands certain characteristic dielectric material to provide advantageous outcomes in the high frequency application unlike other technology. In view that some doped niobates, viz. Cux-Mg1-xNb2O6 (x=0,0.2,0.4,0.6,8,1) and CaxMg1-xNb2O6 (x=0,0.2,0.4,0.6,0.8,1) columbites have been prepared using sol-gel technique. The samples were sintered at 900 deg C for 6 hours. Structural characterization of the prepared samples has been done using XRD. Microwave dielectric properties such as dielectric constant, Qf values and tf values over Ku-band for all the compositions have been measured using a network analyser. It was found that doping effects change in properties significantly as concurrence of structural ordering change and this ensures the suitability towards LTCC applications. Moreover, the low dielectric loss of these materials has shown an advantage.
