In　this　work,　composites　of　M-type　Ba(1-x)SrxFe12O19　hexagonal　ferrite　(x=0.0,　0.2,　0.4,　0.6,　0.8　and　1.0)　and　paraffin　wax　have　been　prepared.　Microwave　characterization　of　the　prepared　composites　was　performed　with　a　vector　network　analyzer　from　0.13　GHz　to　3　GHz.　The　dependence　of　Sr2+　ion　content　on　different　compositions　was　determined　in　terms　of　grain　morphology,　dielectric,　magnetic,　conductivity,　and　reflection　loss　(RL)　properties.　The　grain　size　varied　with　dopants　and　rendered　a　significant　effect　on　material　parameters.　The　dielectric　and　magnetic　loss　tangent　were　reduced　with　the　increase　in　frequency　and　content　of　Sr2+　ions.　The　AC　conductivity　followed　the　trend　of　gradual　increase　with　frequency　and　x=1.0　composition　attained　the　lowest　value　encompassing　the　frequency　spectrum　mostly.　The　observed　RL　peaks　have　been　narrow　in　Ba0.8Sr0.2Fe12O19/wax　composite　and　broad　in　SrFe12O19/wax　composite　along　with　the　low　frequency　spectrum.　x=0.6　composition　has-0.35x10(-3)　dB　reflection　loss　at　0.15　GHz.　All　compositions　revealed　more　than　99.77%　unattenuated　(low-loss)　microwave　signal,　with　-0.01　dB　bandwidth　＞=　1.50　GHz,　and　owe　good　scope　for　their　application　in　low-loss　microwave　devices.　(C)　2021　Elsevier　B.V.　All　rights　reserved.