The 0.83ZnAl
2O
4-0.17TiO
2 (ZAT) ceramics were synthesized by solid state ceramic route. The effect of 27B
2O
3-35Bi
2O
3-6SiO
2-32ZnO (BBSZ) glass on the microwave dielectric properties of ZAT was investigated. The crystal structure and the microstructure of the ceramic-glass composites were studied by X-ray diffraction and scanning electron microscopic techniques. The low frequency dielectric loss was measured at 1 MHz. The dielectric properties of the sintered samples were measured in the microwave frequency range by the resonance method. Addition of 0.2 wt % of BBSZ improved the dielectric properties with quality factor (
Qu ×
f) > 120,000 GHz, temperature coefficient of resonant frequency (
τf) = −7.3 ppm/°C and dielectric constant (
r) = 11.7. Addition of 10 wt % of BBSZ lowered the sintering temperature to about 950 °C with
Qu ×
f > 10,000 GHz,
r = 10 and
τf = −23 ppm/°C. The reactivity of 10 wt % BBSZ added ZAT with silver was also studied. The results show that ZAT doped with suitable amount of BBSZ glass is a possible material for low-temperature co-fired ceramic (LTCC) application.