2006 Fiscal Year Final Research Report Summary
Microwave application of artificial dielectrics based on low temperature cofired ceramics configuration (LTCC)
| Project/Area Number |
17560324
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Electron device/Electronic equipment
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| Research Institution | Ryukoku University |
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Principal Investigator |
AWAI Ikuo Ryukoku University, Faculty of Science and Technology, Professor, 理工学部, 教授 (20026074)
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| Co-Investigator(Kenkyū-buntansha) |
MIYASHITA Toyokatsu Ryukoku University, Faculty of Science and Technology, Professor, 理工学部, 教授 (00026238)
CHO Yogun Ryukoku University, Faculty of Science and Technology, Assistant, 理工学部, 助手 (60324331)
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| Project Period (FY) |
2005 – 2006
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| Keywords | Artificial dielectric / Resonator / Band pass filter / LTCC / Unloaded Q / Coupling coefficient / Multilayer / External Q |
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| Research Abstract |
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.
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