Low temperature sintering behavior and microwave dielectric properties of the $BiNbO_{4^-}$ and the $ZnNb_2O_{6^-}zinc$ borosilicate glass(ZBS) systems were investigated with a view to applying the composition to LTCC technology. The addition of $10{sim}30$ wt% ZBS in both systems ensured successful sintering below $900^{circ}C$. For the $BiNbO_{4^-}ZBS$ system, the sintering was completed when 15 wt% ZBS was added whereas 25 wt% ZBS was necessary for the $ZnNb_2O_{6^-}zinc$ system. Secondary phase was not observed in the $BiNbO_{4^-}ZBS$ system but a small amount of $ZnNb_2O_6$ with the willemite structure as the secondary phase was observed in the $ZnNb_2O_{6^-}ZBS$ system. In terms of dielectric properties, the application of the $BiNbO_{4^-}$ and the $ZnNb_2O_{6^-}ZBS$ systems sintered at $900^{circ}C$ to LTCC were shown to be appropriate; $BiNbO_{4^-}15$ wt% ZBS($varepsilon_r=25,;Q{ imes}f;value=3,700GHz,; au_f=-32ppm/^{circ}C$) and $ZnNb_2O_{6^-}25$ wt% ZBS($varepsilon_r=15.8,;Q{ imes}f;value=5,400GHz,; au_f=-98ppm/^{circ}C$).