Brief introduction Series of coupler(mcro-strip and cavity) is used for shunt and sampling of the directional microwave signal.Coupling degree is 3d B,6 d B,10 d B,35 d B and 50 d B.It is characterized by compactness,light weight and wide frequency band.The coupler will be customized for different compactness,light weight and wide frequency band .The coupler will be customized for different indexes. Technical index. 2.1 Frequence range:400MHz-3000mHz 2.2 Standing wave ratio(SWR)≤ 1.2 2.3 Coupling Degree:(3 d B-60 d B) ?.5 d B 2.4Direction: ≥20 d B