Radio frequency filter and tuning method thereof

A radio frequency filter and a tuning method thereof are provided to easily fix a tuning bolt by forming a coupling unit in a structure in which a plurality of female screw pipe pieces are divided. A radio frequency filter includes a housing(21), a cover(22), a coupling unit(27) and tuning bolts(24,25). The housing(21) includes a window forming unit for adjusting inductance and capacitance, a plurality of cavities partitioned by the window forming unit, and a plurality of dielectric resonators mounted in the plural hollows. The cover(22) has through holes which corresponds to plural dielectric resonators. The coupling unit(27) is inserted into the through holes by being divided into a plurality of female screw pipe pieces. The tuning bolts(24,25) are screw-coupled with the coupling unit(27), and tune the central frequency of the dielectric resonator.