2004 Fiscal Year Final Research Report Summary
Low loss waveguides with photonic crystals at millimeter and submillimeter.
| Project/Area Number |
15560303
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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 | University of Hyogo (2004)
Himeji Institute of Technology (2003) |
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Principal Investigator |
KOKUBO Yoshihiro University of Hyogo, Graduate School of Engineering, Associate Professor, 大学院・工学研究科, 助教授 (80264836)
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| Project Period (FY) |
2003 – 2004
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| Keywords | photonic crystal / PBG / FDTD method / waveguides / propagation loss / hollow dielectric posts / square lattice / triangular lattice |
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| Research Abstract |
(1).A new type of photonic crystal(PC) waveguide has low dielectric loss at millimeter wave frequency.The PC waveguide consists of hollow dielectric posts and a dielectric slab, and a chief power propagates along the surface of the slab put between two PC layers. Loss of the PC waveguide calculated by 3D-FDTD method was around 1.1dB/m at 50GHz for tanδ=2×10^<-4>, and is lower than that of NRD guide.
(2).We have presented a new type of photonic crystal(PC) waveguide in our previous report. The waveguide has a low propagation loss at millimeter wave frequencies compared with an NRD guide, but the PC material is difficult to obtain since a relatively high dielectric constant is required. Therefore, this paper presents another low loss PC waveguide constructed of sintered alumina with a dielectric constant of 8.9 easy to obtain. Though the loss of the PC guide is twice larger than that of the previous PC waveguide, its loss is less than that of an NRD guide and the bending loss is reasonable.
(3).We replace the side walls (E-plane) of a rectangular waveguide by the metallic PCs, since we can expect lower propagation loss due to the reduction of the surface of metals. As the results of calculations, we confirmed the propagation loss on E-plane is the same as the metallic side walls in both case of the triangular and the square lattice.
(4).Though the PC waveguides can construct bend path easily, bend direction is usually parallel to one plane because of their structures. This paper presents a PC waveguide with inner metal-coated posts connected with metal rods that can easily fabricate bend waveguide toward two directions. From our calculation, propagation loss due to the metal is around 1.5〜2dB/m (at 30GHz). Though the loss is larger than conventional metallic waveguide, the PC waveguide is easy to fabricate and reconstruct the propagation path.
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Research Products
(5 results)
