The microwave dielectric properties of ceramics based on Ba(Mg1/3Ta(2-2x)/3Wx/3Tix/3)O-3 is investigated as a function of x. The densification as well as dielectric properties deteriorate with increase in the substitution levels of (Ti1/3W1/3)(3.33+) at (Ta-2/3)(3.33+) site in Ba(Mg1/3Ta2/3)O-3. The iota(f) is approaching zero betweenx = 0.1 and 0. 15 in Ba(Mg(1/3)Ta((2-2x)/3)k(x/3)Ti(x/3))O-3 where quality factor is reasonably good (Q(u) x f = 80,000-90,000 GHz). The Ba(Mg1/3Ta(2-2x)/3Wx/3Tix/3)O-3 with x = 1.0 has epsilon(r) = 15.4, iota(f) = -25.1 ppm/ degrees C, Q(u) x f = 35,400 GHz. (c) 2005 Elsevier Ltd. All rights reserved.