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Broadband circularly-polarized antenna for handheld through-wall radar

A circularly polarized antenna and wall-penetrating radar technology, applied in the microwave field, can solve the problems of large size, difficulty in practical use, poor unit performance, etc., and achieve the effect of satisfying detection distance, working frequency bandwidth, and small cross-sectional size

Active Publication Date: 2018-10-30
湖南赛博诺格电子科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Existing antennas are difficult to meet the above requirements, and are often large in size or poor in unit performance, making it difficult to be practical

Method used

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  • Broadband circularly-polarized antenna for handheld through-wall radar
  • Broadband circularly-polarized antenna for handheld through-wall radar
  • Broadband circularly-polarized antenna for handheld through-wall radar

Examples

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Embodiment Construction

[0026] The present invention will be further described below in conjunction with drawings and embodiments.

[0027] Such as figure 1 Shown is a schematic diagram of the three-dimensional structure of the antenna of the present invention; the specific structure of the antenna includes a radome 1, an upper patch layer 2, a PMI foam layer 3, a lower patch layer 4, a first dielectric layer 5, and a coupling gap from top to bottom. Layer 6, second dielectric layer 7, feed microstrip 8 and metal back cavity 9; the full name of PMI is polymethacrylimide.

[0028] In the embodiment, the feeding microstrip 8 and the coupling slot layer 6 are relatively printed on both sides of the second dielectric layer 7 to form a broadband slot coupling feeding structure, and the coupling slot layer is used as the lower patch layer and the upper patch layer. The radiation of the sheet layer; the lower patch layer 4 is printed on the top surface of the first dielectric layer 5, and the upper patch l...

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Abstract

The invention belongs to the technical field of microwaves and relates to a broadband circularly-polarized antenna for a handheld through-wall radar. The broadband circularly-polarized antenna sequentially comprises a radome 1, an upper patch layer 2, a PMI foam layer 3, a lower patch layer 4, a first dielectric layer 5, a coupling slot layer 6, a second dielectric layer 7, a feed microstrip 8 anda metal back cavity 9 from top to bottom, wherein a hollowed-out slot 61 is formed in the coupling slot layer 6; the shape of the feed microstrip 8 is a combined shape of a rectangle and a sector; and the metal back cavity 9 is a rectangular cavity with an open surface at one end and the open surface is toward the feed microstrip. According to the broadband circularly-polarized antenna, the technologies, such as slot-coupling feeding, a low-dielectric constant layer, laminated microstrip-coupled patches and a reflecting back cavity are comprehensively adopted, so that the antenna reaches theimpedance and beam bandwidth of over 30% under low profile requirements. The target of double-patch coupling resonance is achieved through tuning the transverse dimensions of upper and lower patches,and circular polarization is achieved by adopting the cutting angle design of the rectangular patches.

Description

technical field [0001] The invention belongs to the field of microwave technology, and relates to a broadband circularly polarized antenna for a hand-held through-wall radar, in particular to a multilayer microstrip antenna capable of realizing broadband, low profile, low backlobe and circular polarization. Background technique [0002] With the advancement of science and technology and the rapid development of the electronic industry, wireless detection technology has also been developed rapidly, and at the same time it has been more and more used in security, detection and other fields. [0003] For a high-resolution through-the-wall radar imaging system, the antenna unit is required to have a wider frequency band and be able to radiate short-term transient pulses to obtain better distance resolution and image quality. At the same time, in order to improve the angular resolution, a larger antenna aperture is required, and the mutual coupling between the antennas should be ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01Q1/38H01Q1/50H01Q19/17H01Q1/48
CPCH01Q1/38H01Q1/48H01Q1/50H01Q19/17
Inventor 徐先武唐诗文胥文泉陈嘉磊朱艺巧
Owner 湖南赛博诺格电子科技有限公司
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