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286    Cha pte r  F i v e



                             1000
                                                                              BaTiO 3
                           Temperature coefficient of capacitance (ppm/ o C)  −100 0  PTFE LCP  5 LTCC  3  Glass-titanae  100  Dielectric constant
                              500
                                                                 MgTiO
                                                                     3
                              200
                                      Epoxy,
                                     Polyimides
                              100
                                                 Ta 2 O 3
                                            Al O
                                              2
                                                                           500
                                                                                   1000
                                                     30
                                    BCB
                                             CaTiO 3
                             −500


                            −1000                           TiO 2     SrTiO 3



                             1.01


                             1.00

                             0.99


                             0.98

                            k t /k at 25°C  0.97  Ta O 3
                                                 2
                                               8IO
                                                 2
                             0.96
                                               AI 2 O 3
                                               TIO
                             0.95                2
                                               Polymer

                             0.94

                             0.93

                                    20       40      60      80      100     120      140
                                                      Temperature (°C)
                    FIGURE 5.23  (a) The TCC versus the dielectric constant of various materials. (b) Temperature
                    stability of the dielectric constant of polymer-based composite fi lms with various fi llers.
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