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Broadband low-profile circularly polarized antenna based on asymmetric dipoles

A circularly polarized antenna, dipole technology, applied in the direction of antenna, resonant antenna, electrical short antenna, etc., to achieve the effect of improving isolation, good directivity, wide-axis ratio bandwidth

Active Publication Date: 2020-07-10
XIDIAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The technical problem to be solved by the present invention is to use asymmetric dipoles to realize broadband characteristics, and reduce the height of the antenna section by loading artificial magnetic conductor (AMC) structure, and realize a broadband low-profile circularly polarized antenna

Method used

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  • Broadband low-profile circularly polarized antenna based on asymmetric dipoles
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  • Broadband low-profile circularly polarized antenna based on asymmetric dipoles

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Embodiment Construction

[0040] In order to make the purpose, features and advantages of the present invention more obvious and understandable, the invention will be further described in detail below in conjunction with the accompanying drawings and embodiments, but it is not used as a basis for any limitation on the invention.

[0041] Such as figure 1Shown is a schematic structural diagram of the wide-band low-profile circularly polarized antenna based on the asymmetric dipole of the present invention. The antenna has a four-layer structure. The first layer of dielectric board 1 is a radiation structure with rotational symmetry printed on the upper layer of the dielectric board. It is mainly composed of four asymmetric dipoles, and each dipole includes an outer long arm 5 and an inner long arm 5. The short arm 6, the outer long arm 5 and the inner short arm 6 are connected through the balun grounding part; the second layer of dielectric board 2 is an artificial magnetic conductor (AMC) structure, sp...

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Abstract

The invention discloses a broadband low-profile circularly polarized antenna based on asymmetric dipoles. The antenna has a four-layer structure, wherein the first layer is a radiation structure whichis printed on the upper layer of an upper dielectric plate and has a rotational symmetry characteristic, and comprises four asymmetric dipoles, each dipole comprising a long arm on the outer side anda short arm on the inner side; the second layer is of an artificial magnetic conductor structure and comprises two kinds of different sizes of square metal patches which are printed on the upper layer of a middle dielectric plate; the third layer is a floor printed on the upper layer of a lower dielectric plate and a feed network printed on the lower layer of the lower dielectric plate, and comprises a second-order Wilkinson power divider and a 90-degree broadband phase shifter; and the fourth layer is four broadband balun structures printed on a vertical dielectric plate, provides balance feed for the radiation structure, and realizes impedance matching in a broadband. The antenna has the advantages of wide frequency band, low profile, simple structure, gentle in-band gain and the like,and is suitable for the wireless communication fields of electronic countermeasure, radio frequency identification systems, wireless local area networks, global positioning systems and the like.

Description

technical field [0001] The invention relates to antenna design technology in the field of wireless communication, in particular to a wide-band low-profile circularly polarized antenna based on asymmetrical dipoles. Background technique [0002] Modern communication systems need to achieve stable communication in complex environments and conditions, which have high requirements for antenna stability and anti-interference. Due to the advantages of reducing multipath effects, improving polarization matching efficiency and counteracting Faraday rotation effects, circularly polarized antennas have received more attention in wireless communication fields such as electronic countermeasures, radio frequency identification systems, wireless local area networks, and global positioning systems. , the design of broadband circularly polarized antennas has become a research hotspot in the field of electromagnetics. In recent years, low-profile antennas have attracted the attention of ant...

Claims

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Application Information

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IPC IPC(8): H01Q1/38H01Q1/48H01Q9/28H01Q9/04
CPCH01Q1/38H01Q1/48H01Q9/0428H01Q9/285
Inventor 胡伟李长江冯天喜刘学康钱龙胡志鹏
Owner XIDIAN UNIV
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