GPS (Global Positioning System) receiving antenna of ground corrosion type photonic crystal
A technology of photonic crystals and receiving antennas, which is applied in the directions of antenna grounding devices and radiating element structures, can solve problems such as low gain, increased side lobe fluctuations, and increased back lobes, so as to suppress the interference of out-of-band frequencies and improve Radiation efficiency and the effect of improving frequency selection ability
Inactive Publication Date: 2012-11-28
CHINA ZHENHUA GRP YUNKE ELECTRONICS
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Problems solved by technology
But it also has defects. For example, the structure of the patch antenna can support surface waves, and the existence of surface waves in the patch antenna makes the energy trapped near the dielectric layer and cannot radiate out, which reduces the efficiency of the antenna. At the truncation of the medium, the electromagnetic wave will radiate and diffract, which will affect the antenna pattern, mainly causing the increase of the back lobe and the increase of the side lobe fluctuation, making the antenna vulnerable to electronic interference and deception
Due to the influence of surface waves, high-order modes, feeder loss and dielectric loss, patch antennas have disadvantages such as low efficiency, narrow bandwidth, and low gain.
These shortcomings affect the application of the patch antenna to a certain extent, therefore, it is urgent to improve it for better application
Method used
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Embodiment 1
[0026] like figure 1 , figure 2 As shown, on the ground plate of the ordinary ceramic dielectric GPS receiving antenna, a photonic crystal with a ground-corroded quadrilateral structure is formed by etching, printing and other processes. The period of the structure is 4.0 mm, and the radius of the circular hole is 0.5 mm. The nearby return loss is improved from -22.01dB to -26.95dB.
Embodiment 2
[0028] like image 3 , Figure 4 As shown, on the ground plate of the ordinary ceramic dielectric GPS receiving antenna, a photonic crystal with a ground-corroded quadrilateral structure is formed by etching, printing and other processes. The period of the structure is 4.5 mm, and the radius of the circular hole is 0.3 mm. The nearby return loss is improved from -22.01dB to -32.25dB.
Embodiment 3
[0030] like Figure 5 , Image 6 As shown, the ground corroded hexagonal structure photonic crystal is formed on the ground plate of the ordinary ceramic dielectric GPS receiving antenna through corrosion, printing and other processes. The period of the structure is 3.5 mm, and the radius of the circular hole is 0.6 mm. The return loss near the receiving frequency is improved from -22.01dB to -25.69dB.
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Abstract
The invention discloses a GPS (Global Positioning System) receiving antenna of a ground corrosion type photonic crystal, comprising a dielectric substrate, wherein the front side of the dielectric substrate is provided with a patch antenna, the back side of the dielectric substrate is provided with a ground plate, the center of the ground plate is provided with a feeding pin, and the ground plate has a periodically distributed photonic crystal structure; and photonic crystals can be distributed into a quadrilateral structure, a hexagonal structure or a honeycombed structure. According to the invention, the ground corrosion type photonic crystals with quadrilateral, hexagonal and honeycombed structures, which are changeable in period and unit size, are introduced through the ground plate of the patch antenna, the surface waves propagated along base plate dielectrics can be inhibited by utilizing the forbidden band effect of the photonic crystals, the electromagnetic wave radiant power which is coupled by the antenna to a space is increased, and the efficiency of the antenna can be increased by inhibiting the surface waves, so that the performance of the antenna is improved.
Description
technical field [0001] The invention belongs to the technical field of photonic crystal application, and in particular relates to a ground corrosion type photonic crystal GPS receiving antenna. Background technique [0002] The concept of photonic crystals was proposed independently by Eli Yablonovitch and Sajeev John in 1987. Photonic crystal is a new type of artificial material whose permittivity changes periodically in space, whose lattice constant can be compared with the wavelength of light, has a photonic bandgap structure, and can control the state of photon propagation. The basic feature of photonic crystals is that they have a photonic band gap, and electromagnetic waves whose frequency falls in the band gap are forbidden to propagate. Another key feature of photonic crystals is photonic localization. If doping impurities or introducing some kind of defect into the periodic structure of photonic crystal, the photons whose frequency coincides with the defect state ...
Claims
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Login to View More IPC IPC(8): H01Q1/48H01Q1/38
Inventor 李胜张青谢强罗向阳周瑞山阳元江刘剑林罗彦军李吉云韩玉成
Owner CHINA ZHENHUA GRP YUNKE ELECTRONICS