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Fractal miniaturization method for axial mode cylinder helical antenna

A technology of helical antenna and axial mode, which is applied in the direction of antenna, antenna grounding device, antenna grounding switch structure connection, etc., can solve the problems of large size, difficult to match, and bulky helical antenna, reduce the working frequency and realize the miniaturization of size Effect

Active Publication Date: 2014-07-23
SHANGHAI JIAO TONG UNIV
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the microwave and millimeter wave frequency bands, the physical size of the helical antenna is small, but in the lower frequency bands such as UHF, VHF, HF, and LF frequency bands, the size of the helical antenna will become so large and bulky that it cannot be used
In addition, although the input impedance of the conventional cylindrical helical antenna (CHA) is almost a constant in the band, it is not ideal purely resistive, and the imaginary part presents a large capacitive component, which is difficult to match

Method used

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  • Fractal miniaturization method for axial mode cylinder helical antenna
  • Fractal miniaturization method for axial mode cylinder helical antenna
  • Fractal miniaturization method for axial mode cylinder helical antenna

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Embodiment Construction

[0042] The following is based on I 1(One iteration) Guiseppe Peano Curve specifically designed the miniaturized Gesep Peano helical antenna (GPHMA), and gave corresponding drawings to describe the invention in detail. It should be noted that the preferred implementation examples described here are only used to illustrate and explain the present invention, and are not used to limit or limit the present invention.

[0043] like Image 6 As shown, the antenna structure adopted in the present invention includes a Gesip-Piano fractal helix 1, a quarter-wavelength air microstrip impedance converter 2, a conformal cylinder 3, a metal disc 4, and a 50Ω standard Axis 5.

[0044] The Gesip Peano fractal miniaturization design method of the axial modulus cylindrical helical antenna is introduced in detail below, that is, the fractal miniaturization method of the axial modulus cylindrical helical antenna includes the following steps:

[0045] Step 1: Construct a strip with width W and ...

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Abstract

The invention discloses a fractal miniaturization method for an axial mode cylinder helical antenna. The method includes the first step of constructing a fractal curve, the second step of constructing a longer periodic fractal curve, the third step of drawing a cylinder, the fourth step of counterclockwise rotating the periodic fractal curve constructed in the second step along the starting point of the periodic fractal curve by the angle alpha or the angle of pi-alpha, the fifth step of forming a circle of dextrorotation or levorotation cylinder helix, the sixth step of combining M circles of fractal helixes to form a fractal helix strip, the seventh step of turning the M circles of the fractal helixes in the sixth step into a metal conduction band with the thickness of T, the eighth step of placing concentric round copper plates, and the ninth step of adding a lambda / 4 impedance transformer at the initial end of a fractal helical line. According to the method, operating frequency of an axial mode of the helical antenna is lowered, so that size miniaturization is achieved.

Description

technical field [0001] The invention relates to an antenna and a fractal miniaturization method thereof, which is a fractal miniaturization method of an axial-mode cylindrical helical antenna, in particular a Gesip-Piano fractal miniaturization method of an axial-mode cylindrical helical antenna . Background technique [0002] Circularly polarized waves have the advantages of anti-ionospheric Faraday magnetic effect, good target recognition ability, strong anti-interference ability, good communication link robustness (Robustness), and low requirements for antenna installation. , radio astronomy, radar detection, electronic reconnaissance / countermeasures, electronic warfare and other fields have been widely used. Circularly polarized waves are usually generated by circularly polarized antennas or circular polarizers. Conventional circularly polarized antennas use two excitation feeds with equal amplitudes, orthogonal phases, and orthogonal directions to generate circularly ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01Q1/36H01Q1/50H01Q1/48H01Q19/10
Inventor 李道铁毛军发
Owner SHANGHAI JIAO TONG UNIV
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