Polycrystalline BaTe4O9 ceramic compound was investigated as a promising microwave dielectric compound for low-temperature cofired ceramics (LTCC) applications. The binary phase BaTe4O9 was synthesized and subsequently densified over the temperature range of only 500 degrees-550 degrees C, which allows for low-temperature cofiring with aluminum metal. The dielectric properties of BaTe4O9 ceramics sintered at 550 degrees C for 2 h were determined in the microwave region of 12-14 GHz. The dielectric constant and Qxf product obtained were 17.5 and 54 700 GHz at 12 GHz, respectively. The temperature coefficient of resonance frequency showed a negative value of -90 ppm/degrees C. In terms of its evaluation for LTCC, the BaTe4O9 composition was found to be chemically compatible and successfully cofired with highly conductive aluminum electrode, while maintaining good electrical performance.