Microwave application of artificial dielectrics based on low temperature cofired ceramics configuration (LTCC)

1.基于人工介电介质概念的多层数字间谐振器将以小型化、低损耗和良好的杂散性改善微波电路的特性。我们成功地实现了谐振腔的小型化，并按照E/M仿真的预期改善了谐振腔的杂散性能，但损耗仍然大于预期。原因很简单，就是PCB上的铜片表面粗糙。因此，我们试图在LTCC结构中制造它。宽边耦合开环谐振器相互作用非常强。我们试图利用这种结构实现宽带BPF。通过我们的共面结构和多级bpf，可以很容易地实现带宽的调整和对外部电路的匹配。LTCC的实现也将被尝试。我们提出了一个统一的程序来计算谐振器的谐振频率、外部Q、空载Q和耦合系数在时域。必要的数据是谐振腔场强随时间的变化。它是传统的基于S参数频率特性的频域方法（FDM）的对偶。该方法容易给出Q值，但有时fdm在计算中会遇到困难。我们提出了一种区分谐振器耦合系数的磁贡献和电贡献的新表达式。许多重要的例子可以很好地理解耦合机制。

1.Multilayered interdigital resonators based on the concept of artificial dielectrics will improve the microwave circuit characteristics by miniaturization, low loss and good spurious property. We have succeeded to miniaturize the resonator with improved spurious property as was expected by E/M simulation, but the loss is still bigger than the expectation. The reason should simply be the rough surface of the Cu sheets on the PCB. Thus, we are trying to fabricate it in the LTCC structure.2.Broad side coupled open ring resonators interact quite strongly each other. We try to realize a broad-band BPF utilizing this structure. Adjustment of the band width and matching to the external circuit are easily attained by our coplanar configuration together with the multi-stage BPFs. The LTCC implementation will be tried, too.3.We have proposed a unified procedure to calculate the resonant frequency, external Q, unloaded Q and coupling coefficient of resonators in the time domain. The necessary data are the time variation of the resonator field intensity. It is dual to the conventional frequency domain methods (FDM) which are based on the frequency characteristics of S parameters. The present method gives Q values easily that the FDMs sometimes find difficulty in calculating.4.We have proposed a new expression for discriminating the magnetic and electric contribution for the coupling coefficient of resonators. Many important examples gave a good understanding of the coupling mechanism.