The phase evolution, microstructure, and microwave dielectric properties of Ba(Mg_0.5-2xY_2xW_0.5-xTi_x)O₃ (x＝ 0.005~0.05) ceramics sintered at 1,700℃ for 1h were investigated. All compositions exhibited a 1:1 ordered cubic perovskite structure. The field emission scanning electron microscopy image revealed a dense microstructure in all the compositions. As the value of x increased, the lattice parameter, dielectric constant, and quality factor increased. The temperature coefficient of resonant frequency changed from -19.6 ppm/℃ to -5.9 ppm/℃ with increasing x value. The dielectric constant, quality factor, and temperature coefficient of resonant frequency of Ba(Mg_0.40Y_0.10W_0.45Ti_0.05)O₃ were 21.7, 132,685 GHz, and -5.9 ppm/℃, respectively.