Subwavelength Waveguide and Delay Line with Fractal Cross Sections具有分形截面的亞波長波導及延遲線
In conventional metallic waveguides, the transverse dimension of the waveguide determines the cut-off frequency for the transmission of electromagnetic (EM) waves. This means the larger the transverse dimension of the waveguide, the longer the wavelength of the guided waves. Hence, it may not be practical for long-wavelength microwave or radio waves to have EM waveguides.
This invention shows the method in which the microwaves or radio-frequency waves can be guided in their propagation through channels whose cross sections contain fractal patterns, with relevant dimensions much smaller than the wavelengths of the guided waves. Such waveguides would be sub-wavelength in all cross sectional dimensions, thereby allowing compact designs for guided propagation of long-wavelength EM waves. Maximum transmission magnitude (~100%) can be nearly achieved with efficient coupling. Experiments show a piece of fractal slits can exhibit fairly sizable delay.
The invention can be applied for telecommunication device and reduce the size of waveguides.
1. Good RF and microwave guiding techniques
2. Small size waveguides but transmit long wavelength electromagnetic (EM) wave
3. More efficient device
- Telecommunication such as sub-wavelength transmission of EM wave, RF and microwave radiation, etc.
Patent Number: CN100479888C
Application Number: CN200510067149A
Inventor: Siping Chen | Xia Guo | Xianfa Wu
Priority Date: 19 Apr 2005
Priority Number: CN100479888C
Application Date: 19 Apr 2005
Publication Date: 22 Apr 2009
IPC Current: A61N000700
Title: Supersonic cure instrument for promoting healing of fracture and supersonic wave generating method thereof | A kind of ultrasonic therapeutic apparatus and promoting the healing of fracture and ultrasonic produce method
Usefulness: Supersonic cure instrument for promoting healing of fracture and supersonic wave generating method thereof | A kind of ultrasonic therapeutic apparatus and promoting the healing of fracture and ultrasonic produce method
Novelty: Supersonic cure instrument for promoting healing of fracture and its supersonic wave generating method
信息和通信技術/電信
電信
5 Apr 2006
US 11/398464
US 7567149
TTC.PA.291S
香港
