Coaxial resonant cavity structure capable of achieving fine frequency modulation and frequency modulation method

The invention discloses a coaxial resonant cavity structure capable of achieving fine frequency modulation and a frequency modulation method. The coaxial resonant cavity structure comprises a resonantcavity (1), a center shaft (2), a medium supporting window piece (3) and a medium fixing and supporting ring (4), wherein the medium supporting widow piece (3) and the medium fixing and supporting ring (4) are used for supporting the center shaft (2) so as to enable the center shaft (2) to move along the axial direction in the resonant cavity (1), and the center shaft (2) is of a gradually changing structure with the radius being gradually changed, the center shaft with the radius being gradually changed can achieve fine modulation for the resonant frequency in the resonant cavity through moving along the axial direction. 本发明公开了种可精细调频的同轴谐振腔体结构及调频方法，该同轴谐振腔体结构包括谐振腔体(1)、中心轴(2)、介质支撑窗片(3)和介质固定支撑环(4)，其中介质支撑窗片(3)和介质固定支撑环(4)用以支撑中心轴(2)，使中心轴(2)能够在谐振腔体(1)内沿轴向移动，该中心轴(2)为半径渐变的渐变式结构，该半径渐变的中心轴通过沿轴向移动，可实现谐振腔体内谐振频率的精细调节。