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High-power far-distance terahertz rotation paraboloid orientation emission antenna

A rotating parabola and directional emission technology, applied in the terahertz field, can solve the problems of high antenna gain and unsatisfactory narrow beam characteristics

Inactive Publication Date: 2014-10-22
TSINGHUA UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, the aforementioned antennas are not ideal in terms of the achieved high gain and narrow beam characteristics

Method used

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  • High-power far-distance terahertz rotation paraboloid orientation emission antenna

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Embodiment 1

[0043] The antenna shown in Figure 1, including the antenna includes a femtosecond laser, a terahertz photoconductive antenna, a silicon substrate lens and a rotating parabolic emitter, the femtosecond laser excites the terahertz photoconductive antenna to generate terahertz radiation, and the terahertz radiation is converged by the lens as a feed.

[0044] like figure 2 As shown, the gain is designed to be 40dB, the center frequency is 0.21THz, and the frequency range is from 0.2THz to 0.22THz. This frequency band happens to be the window frequency where water vapor in the atmosphere absorbs weaker THz. The aperture size is 58.5mm, and the focal length is 29.2mm. The simulation shows that the -10dB line corresponds to 45 degrees, so the antenna system is about 53 degrees.

[0045] The three-dimensional energy diagrams of the terahertz radiation emitted by the feed source (converged by the lens) and the terahertz radiation reflected by the paraboloid are respectively obtaine...

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Abstract

The invention provides a high-power far-distance terahertz rotation paraboloid orientation emission antenna. The antenna comprises a femto second laser, a terahertz photoconduction antenna, a silicon substrate lens and a rotation paraboloid emitter. The silicon substrate lens is arranged above the terahertz photoconduction antenna, the femto second laser excites the terahertz photoconduction antenna to generate terahertz radiation, and the terahertz radiation is taken as a feed source of the rotation paraboloid emitter after being converged by the silicon substrate lens. The high-power far-distance terahertz rotation paraboloid orientation emission antenna has the advantages of small dimension, light weight, simple structure and easy integration. Since the size is small, the terahertz radiation is converged through the lens so as to be taken as the feed source, such that a surface wave effect caused by the photoconduction antenna can be well eliminated; the emission energy direction of an antenna system is more concentrated, and the gain is greater; after the terahertz radiation passes through a paraboloid mirror, spherical radiation generated by the photoconduction antenna is converted to equiphase plane waves; and the advantages of high gain, low sidelobe and the like are realized effectively.

Description

【Technical field】 [0001] The invention relates to the field of terahertz, in particular to a rotating parabolic antenna for high-power long-distance terahertz directional transmission. 【Background technique】 [0002] The high-power emission source of terahertz has always been a difficult point in the field of terahertz research. In October 2013, a group of researchers from the Technical University of Vienna in Austria created a new type of quantum cascade laser, which successfully output 1 watt of terahertz radiation, breaking the 0.25 watt world previously maintained by the Massachusetts Institute of Technology. record. It can be seen that it is very difficult to increase the power of terahertz sources, so how to improve the efficiency of the terahertz output system and how to design terahertz directional transmitting antennas are crucial for efficient use of terahertz sources. The study of terahertz directional emission is the key technology to realize terahertz long-dis...

Claims

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Application Information

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IPC IPC(8): H01Q1/36H01Q19/06H01Q15/02H01Q19/12
Inventor 郑小平苏云鹏刘梦婷程远
Owner TSINGHUA UNIV
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