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Double-frequency high-gain coaxial feed patch antenna

A patch antenna and coaxial feeding technology, which is applied to antennas, devices and circuits that enable antennas to work in different bands at the same time, to achieve the effects of simple structure, high gain, and easy processing

Inactive Publication Date: 2013-08-28
BEIJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

[0010] The present invention first designs a coaxial feed patch antenna that can work simultaneously in the two frequency bands of 2.45GHz and 5.8GHz. Its structure includes a metal ground plate, a rectangular metal thin layer patch, an antenna medium, and a feed core. The antenna structure is simple; for the situation where the gain is not ideal, a method that can improve the gain of the two working frequency bands at the same time is proposed; according to the method of improving the antenna gain, adjust the thickness of the two EBG coatings and the distance between the two to design a suitable EBG cladding, and place the EBG cladding in a suitable position directly above the rectangular thin metal patch to improve the gain of the dual-band antenna

Method used

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Embodiment Construction

[0036] The specific embodiments of the present invention are as follows.

[0037] First, design a coaxial-fed patch antenna that can work simultaneously in the two frequency bands of 2.45GHz and 5.8GHz. Antenna structure such as figure 1 As shown, based on the realization of FR4 material, the relative permittivity of the antenna medium ε r = 4.4, antenna medium thickness h = 1.6mm; by formula (1), (2), (3) and optimize the patch (such as figure 1 shown) size: l=27.6mm, w=41mm; the coaxial feed position obtained from formula (4) and optimization: X f =6.8mm, Y f =9.8mm, where X f is the offset between the coaxial center and the center of the rectangular patch in the x direction, Y f It is the position offset between the center of the coaxial axis and the center of the rectangular patch in the y direction; the grounding plate is made of an aluminum plate, which is a square of p=110mm, and the thickness of the aluminum plate is t=1mm. The metal grounding plate is parallel...

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Abstract

The invention provides a high-gain antenna which can simultaneously work at two frequency bands of 2.45 GHz and 5.8GHz and a method for realizing the high-gain antenna, which belong to the technical field of electromagnetic propagation and receiving. A double-frequency high-gain coaxial feed patch antenna provided by the invention comprises a rectangular thin metal patch, a metal earth plate and two EBG (electromagnetic band gaps) coatings. The method specifically comprises steps of loading the EBG coatings right above the coaxial feed patch antenna. The coaxial feed patch antenna is characterized in that a loaded EBG coating structure has specific dimensions and arrangement, and a specific distance is left between the two EBG coatings and a metal earth plate of the antenna. The gains of two working frequency bands of the antenna are effectively increased through the loaded EBG coating structures; and moreover, the EBG coating structures and the patch antenna can be respectively designed, and a double-frequency high-gain antenna designing process is simplified. The antenna provided by the invention can work at two frequency bands of 2.45 GHz and 5.8GHz and is particularly suitable for application occasions with high directional requirements. Guidance is provided for designing the multi-frequency high-gain antenna through utilizing the method provided by the invention.

Description

technical field [0001] The invention provides a dual-frequency high-gain coaxial feed patch antenna, which can work in two frequency bands of 2.45GHz and 5.8GHz at the same time, and is especially suitable for systems with high directivity requirements in these two frequency bands. Accepted technical fields. Background technique [0002] 1. Characteristics of Microstrip Antenna [0003] Microstrip antennas are widely used due to the advantages of low profile, small size, easy conformality, and integration with circuits (Document 1, Xing Long Guo, H.B.Ji, H.H.Yin, J.Huang, Antenna for Wireless Communications on Unmanned Aerial Vehicles , Applied Mechanics and Materials, Vol.241–244, 2013). Through techniques such as slotting, multi-layer stacking of patches, and appropriate coaxial feeding, it is easy to make the microstrip antenna work at two or more frequencies, which is not only conducive to integration but also saves costs. The microstrip antenna also has some disadvan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01Q1/38H01Q5/01H01Q5/10
Inventor 纪越峰田慧平罗群王绪东果争
Owner BEIJING UNIV OF POSTS & TELECOMM
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