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Dual-band dual-circularly polarized microstrip array antenna with wide axial ratio bandwidth

An axial ratio bandwidth, microstrip array technology, applied in the field of antennas, can solve the problems of narrow dual-frequency circularly polarized axial ratio bandwidth of the antenna, limiting the working bandwidth of the antenna, etc., achieving simple structure, convenient processing, and increasing dual-frequency axial ratio. The effect of bandwidth

Inactive Publication Date: 2018-12-18
NANJING UNIV OF SCI & TECH
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  • Claims
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Problems solved by technology

However, although there are many studies on this antenna, they all have a common shortcoming, that is, the dual-frequency circular polarization axis ratio of the antenna is too narrow.
For microstrip antennas, the circular polarization axial ratio bandwidth is often smaller than the antenna's standing wave ratio bandwidth, so a narrower axial ratio bandwidth will severely limit the antenna's operating bandwidth

Method used

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  • Dual-band dual-circularly polarized microstrip array antenna with wide axial ratio bandwidth
  • Dual-band dual-circularly polarized microstrip array antenna with wide axial ratio bandwidth
  • Dual-band dual-circularly polarized microstrip array antenna with wide axial ratio bandwidth

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Embodiment

[0030] In the example design we made, the array size we selected is 2×2 units, and the working frequency f 1 and f 2 9.5GHz and 11.9GHz respectively. The operating frequency is f 1 and f 2 The dual-frequency line-polarized radiation patch 2 is a dual-feed point line-polarized microstrip patch, which embeds the low-frequency feed to obtain impedance matching. At this time, a symmetrical microstrip patch is used to weaken the embedded feed to the high The influence of frequency field distribution. combine figure 1 , the first, second, third, and fourth operating frequencies are f 1 The relative phases are 90°, 180°, 270°, and 0° respectively, and the phase arrangement enables left-handed circular polarization to be realized in the low frequency band; the first, second, third, and fourth operating frequencies are f 2 The relative phases are 0°, 270°, 180°, and 90° respectively. This phase arrangement enables right-handed circular polarization to be realized in the high fre...

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Abstract

The invention discloses a dual-frequency dual-circularly polarized microstrip array antenna with wide axial ratio bandwidth. The microstrip array antenna comprises a monolayer microwave dielectric substrate, four dual-frequency linearly polarized radiation patches with working frequencies of f1 and f2, and a dual-frequency shared microstrip power dividing network. Wherein, the dual-frequency linearly polarized radiation patch with the working frequency f1, f2 is uniformly distributed on the circumference with the point O as the center; The dual-frequency shared microstrip power dividing network comprises two Wilkinson power dividers, two dual-frequency shared 90-degree phase shifters composed of microstrip lines, and one dual-frequency shared 180-degree phase shifter. The invention effectively increases the dual-frequency circular polarization axial ratio bandwidth, and can be conveniently expanded into a high-gain array with a larger aperture, adopts a single-layer dielectric plate, and the array element is a single unit, the structure is simple, the profile is low, and realization is easye.

Description

technical field [0001] The invention belongs to the technical field of antennas, in particular to a wide-axis-ratio-bandwidth dual-frequency dual-circularly polarized microstrip array antenna. Background technique [0002] With the advancement of technology and the increasingly complex electromagnetic environment, the current radar and communication systems undertake more and more functions, and multi-functional integration has become an important development trend. However, for wireless systems such as radar and mobile communications, each function requires a separate antenna. This not only makes the antenna bulky, but also compresses the available space of other hardware in the system, which is not conducive to the miniaturization and integration of the system. In this context, the multi-frequency, multi-polarization common-aperture design of antennas has become an important research direction in the field of antennas, among which dual-frequency dual-polarization antennas...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01Q21/24H01Q1/50H01Q1/38
CPCH01Q1/38H01Q1/50H01Q21/24
Inventor 张金栋姚祺陈峤羽冯敏吴翠翠汤普祥周雅莉陈祥云张弘毅韦一方万睿
Owner NANJING UNIV OF SCI & TECH
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