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Moon-based low-frequency antenna array based on tightly coupled structure

An antenna array and tight coupling technology, which is applied in the directions of antenna array, antenna, antenna coupling, etc., to achieve the effects of reduced reflection, increased radiation resistance, and reduced variation

Inactive Publication Date: 2018-08-14
NAT ASTRONOMICAL OBSERVATORIES CHINESE ACAD OF SCI
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  • Claims
  • Application Information

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Problems solved by technology

However, most of these schemes are only academic discussions, and only a few antennas have entered practical applications.

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  • Moon-based low-frequency antenna array based on tightly coupled structure
  • Moon-based low-frequency antenna array based on tightly coupled structure
  • Moon-based low-frequency antenna array based on tightly coupled structure

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Embodiment Construction

[0054] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

[0055] The working frequency band of the moon-based low-frequency antenna is 100kHz~30MHz, spanning 300 frequency widths, and is a non-frequency variable antenna. Commonly used non-frequency variable antennas are mostly helical antennas, log periodic antennas, self-complementary antennas and other antenna forms. However, these antennas have complex structures and high application frequencies. If these traditional ultra-wideband antennas are used in the target frequency range, the antenna size will be extremely large, which is ultimately not conducive to the installation of spacecraft and the deployment of the moon. According to the project index requirements, the antenna needs to be able to measure the three-dimensional...

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Abstract

The invention discloses a combined arm type moon-based low-frequency antenna array of a tightly coupled array. A simulation experiment result shows that after the combined arm type tight coupling array is adopted, the impedance matching of the antenna in a low-frequency section is greatly improved; the array gain directional diagram of the combined arm type antenna has a larger scanning angle compared with a traditional sparse array antenna array. On the basis of optimizing and debugging the size parameter of the combined arm type moon-based low-frequency array antenna, the impedance characteristic and the gain directional diagram of the antenna are given. The array antenna has two mutually independent polarization directions of horizontal polarization and vertical polarization; and the polarization waves in the two directions need to be independently scanned in the horizontal direction and the vertical direction. According to the antenna array in the invention, a scanning angle rangeof the array antenna under the large-angle scanning condition. In conclusion, the combined arm type moon-based low-frequency antenna array achieves the purpose of signal source distinguishing and incoming wave polarization mode distinguishing well.

Description

Technical field [0001] The present invention relates to the field of antenna technology, in particular to low-frequency array antenna technology in deep space exploration. Background technique [0002] Celestial / cosmic electromagnetic radiation with a frequency lower than 10MHz can reveal many phenomena that electromagnetic radiation in other frequency bands cannot. The plasma in the earth’s ionosphere absorbs and shields outer space electromagnetic waves with frequencies lower than 10MHz, making it difficult for electromagnetic waves from outer space with frequencies lower than 5MHz to pass through the earth’s ionosphere to the ground at almost any time and area. To carry out the observational research of electromagnetic waves in this frequency band, it is necessary to break through the limit of the earth's ionosphere, use the astronomical radio antenna mounted on the space probe or the detection radar mounted on the planetary orbiter, and adopt the passive detection mode to con...

Claims

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Application Information

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IPC IPC(8): H01Q5/28H01Q21/00H01Q5/307H01Q1/52
CPCH01Q1/52H01Q5/28H01Q5/307H01Q21/00
Inventor 何若愚张洪波李春来苏彦孔德庆朱新颖李俊铎李臣戴舜薛喜平邢树果
Owner NAT ASTRONOMICAL OBSERVATORIES CHINESE ACAD OF SCI
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