[2] [2] WANG H, ZHOU F M, GUO J M, et al. Modified BCZN particles filled PTFE composites with high dielectric constant and low loss for microwave substrate applications[J]. Ceram Int, 2020, 46(6): 7531-7540.

[3] [3] KUANG K, KIM F, CAHILL S S. RF and microwave microelectronics packaging[M]. Boston MA: Springer Science+Business Media, LLC, 2010.

[4] [4] SUBODH G, DEEPU V, MOHANAN P, et al. Polystyrene/ Sr2Ce2Ti5O15 composites with low dielectric loss for microwave substrate applications[J]. Polym Eng Sci, 2009, 49(6): 1218-1224.

[5] [5] XIANG F, WANG H, YAO X. Dielectric properties of SrTiO3/POE flexible composites for microwave applications[J]. J Eur Ceram Soc, 2007, 27(8-9): 3093-3097.

[6] [6] DRISHYA V, UNNIMAYA A N, NAVEENRAJ R, et al. Preparation, characterization, and dielectric properties of PP/CaTiO3 composites for microwave substrate applications[J]. Int J Appl Ceram Technol, 2016, 13(5): 810-815.

[7] [7] RAJESH S, MURALI K P, PRIYADARSINI V, et al. Rutile filled PTFE composites for flexible microwave substrate applications[J]. Mater Sci Eng B, 2009, 163(1): 1-7.

[8] [8] RAJESH S, MURALI K P, RATHEESH R. Preparation and characterization of high permittivity and low loss PTFE/CaTiO3 microwave laminates[J]. Polym Compos, 2009, 30(10): 1480-1485.

[9] [9] MURALI K P, RAJESH S, PRAKASH O, et al. Comparison of alumina and magnesia filled PTFE composites for microwave substrate applications[J]. Mater Chem Phys, 2009, 113(1): 290-295.

[11] [11] ZHANG W W, LU C, GE M N, et al. Surface modified and gradation-mixed Al2O3 as an effective filler for the polyphenylene oxide (PPO) insulative layer in copper clad laminates[J]. J Mater Sci Mater Electron, 2020, 31(23): 21602-21616.

[12] [12] JAMES N K, RAJESH S, MURALI K P, et al. Preparation and microwave characterization of BaWO4 filled polytetrafluoroethylene laminates for microwave substrate applications[J]. J Mater Sci Mater Electron, 2010, 21(12): 1255-1261.

[13] [13] THOMAS S, DEEPU V, UMA S, et al. Preparation, characterization and properties of Sm2Si2O7 loaded polymer composites for microelectronic applications[J]. Mater Sci Eng B, 2009, 163(2): 67-75.

[14] [14] JOSE J P, MHETAR V, CULLIGAN S, et al. Cross linked polyethylene/TiO2 nanocomposites: Morphology, polymer/filler interaction, mechanics and thermal properties[J]. Sci Adv Mat, 2013, 5(4): 385-397.

[15] [15] CAZAN C, ENESCA A, ANDRONIC L. Synergic effect of TiO2 filler on the mechanical properties of polymer nanocomposites[J]. Polymers, 2021, 13(12): 2017.

[16] [16] BIAN W C, YAO T, CHEN M, et al. The synergistic effects of the micro-BN and nano-Al2O3 in micro-nano composites on enhancing the thermal conductivity for insulating epoxy resin[J]. Compos Sci Technol, 2018, 168: 420-428.

[17] [17] BERBERICH L J, BELL M E. The dielectric properties of the rutile form of TiO2[J]. J Appl Phys, 1940, 11(10): 681-692.

[18] [18] XU J, AKISHIGE Y. KF-doped BaTi2O5 ferroelectric ceramics by solid-state reaction of KF and sol-gel-derived BaTi2O5 powders[J]. Appl Phys A, 2007, 90(1): 153-157.

[19] [19] HADJIIVANOV K I, KLISSURSKI D G. Surface chemistry of titania (anatase) and titania-supported catalysts[J]. Chem Soc Rev, 1996, 25(1): 61.

[23] [23] YAO X G, PENG H Y, GU Z Y, et al. Polyphenylene oxide/Ca0.7La0.2TiO3 microwave composite substrate[J]. J Inorg Mater, 2022, 37(5): 493-498.

[24] [24] LUO F C, YUAN Y, TANG B, et al. The effects of TiO2 particle size on the properties of PTFE/TiO2 composites[J]. J Mater Sci Chem Eng, 2017, 5(7): 53-60.

[25] [25] LUO F C, TANG B, FANG Z X, et al. Effects of coupling agent on dielectric properties of PTFE based and Li2Mg3TiO6 filled composites[J]. Ceram Int, 2019, 45(16): 20458-20464.

[26] [26] LI Z T, YUAN Y, YAO M H, et al. Synthesis and characterization of PTFE/(NaxLi1-x)0.5Nd0.5TiO3 composites with high dielectric constant and high temperature stability for microwave substrate applications[J]. Ceram Int, 2019, 45(17): 22015-22021.

[27] [27] LI C C, XIANG H C, XU M Y, et al. Li2AGeO4 (A=Zn, Mg): Two novel low-permittivity microwave dielectric ceramics with olivine structure[J]. J Eur Ceram Soc, 2018, 38(4): 1524-1528.