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

1.基于人工谐振概念的多层交指谐振器具有小型化、低损耗和良好的杂散特性，将改善微波电路的性能。我们已经成功地将谐振器的寄生特性改善，正如E/M模拟所预期的那样，但损耗仍然大于预期。原因应该只是PCB上的铜片表面粗糙。因此，我们正试图在LTCC结构中制造它。2.宽边耦合开环谐振器相互作用相当强烈。我们试图利用这种结构来实现宽带BPF。通过共面结构和多级带通滤波器，可以很容易地实现带宽的调整和与外部电路的匹配。3.提出了一个统一的计算方法，可以在时域内计算谐振器的谐振频率、外Q值、无载Q值和耦合系数。必要的数据是谐振器场强度的时间变化。它与传统的基于S参数频率特性的频域方法（FDM）是对偶的。该方法给出的Q值比较容易，而频分复用器有时难以计算。4.提出了一种新的表达式，用于区分谐振器耦合系数的磁、电贡献。许多重要的例子给出了很好的理解耦合机制。

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.