[4] [4] HUBER O, FASETH T, MAGERL G, et al. Dielectric characterization of RF-printed circuit board materials by microstrip transmission lines and conductor-backed coplanar waveguides up to 110 GHz[J]. IEEE Transactions on Microwave Theory and Techniques, 2018,66(1):237-244. doi:10.1109/TMTT.2017.2750152.

[7] [7] SáNCHEZ J R,NOVA V,BACHILLER C,et al. Characterization of nematic liquid crystal at microwave frequencies using splitcylinder resonator method[J]. IEEE Transactions on Microwave Theory and Techniques, 2019, 67(7): 2812-2820. doi: 10.1109/ TMTT.2019.2916790.

[12] [12] IPC. Stripline test for complex relative permittivity of circuit board materials to 14 GHz[M]// IPC-TM-650 Test Methods Manual. Northbrook,IL:IPC, 1998.

[13] [13] IPC. Relative permittivity and loss tangent using a split-cylinder resonator[M]// IPC-TM-650 Test Methods Manual. Bannockburn,IL:IPC, 2007.

[15] [15] FERRO. Technical data sheet:low temperature co-fired ceramic systems A6M-E high frequency LTCC tape system[Z]. Mayfield Heights,OH:Ferro Corporation, 2015.