The effects of Mn doping on the phase composition and dielectric properties of (1-x)BaO·xSrO·0.7TiO_2·0.3Nb_2O_5 (BSTN) composite ceramics was investigated. The results showed that the dielectric constants of 0.7BaO·0.3SrO·(0.7-z)TiO_2·0.3Nb_2O_5·zMnO_2 (BSTNM) composite ceramics basically decreases as the content of doped MnO_2 increases at the same applied frequency, while tan5 decreases when value z ≤ 0.01 but increases when value z > 0.01. The phase transition temperature of tungsten bronze phase in BSTNM composite ceramics increases with the increase of value z.
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