CN-120089938-B - Differential decoupling antenna based on dislocation arrangement double strips

Abstract

The invention discloses a differential decoupling antenna based on staggered arrangement of double strips, wherein two rectangular metal patches are arranged side by side in a top metal layer, and the two metal strips are respectively and horizontally arranged above and below the rectangular metal patches and are arranged in parallel in a staggered manner to form a decoupling structure. The inner cores of the four coaxial feed probes are respectively inserted in the vertical direction from the underground direction of the bottom metal and correspondingly connected with a rectangular metal patch in pairs, and two feed probes connected with the same rectangular metal patch respectively form a pair of differential ports. According to the invention, the parallel strips are arranged on the two patch units in a vertically staggered manner, and the arrangement directions of the strips and the differential ports are consistent, so that a weak field is generated on the mutual coupling patch, and the mutual coupling of the differential antenna is realized. Such a staggered arrangement achieves a relatively high isolation in a relatively compact situation. At the same time, the antenna size is smaller and the ECC level is reduced.

Inventors

• ZHANG LINGYAN
• YANG XINYU
• CHANG GUANGMING
• SHI JIN
• XU KAI
• JIANG RUIRUI
• CHEN YANYUN

Assignees

• 南通大学

Dates

Publication Date

20260508

Application Date

20250321

Claims (5)

1. 1. The differential decoupling antenna based on the staggered arrangement double strips is characterized by comprising a top metal layer, a middle dielectric substrate, a bottom metal ground and a feed structure; The top metal layer comprises two rectangular metal patches and two metal strips, wherein the two rectangular metal patches are distributed side by side, the two metal strips are respectively and horizontally distributed above and below the rectangular metal patches, and the two metal strips are mutually parallel and staggered for a certain length to form a decoupling structure; The feeding structure comprises four coaxial feeding probes, wherein the inner cores of the coaxial feeding probes are respectively inserted into the bottom metal from the underground vertically upwards and correspondingly connected with a rectangular metal patch in pairs, and the feeding points are positioned on the horizontal symmetry axis of the patch; The left end of the upper metal strip is relatively positioned between the left edge of the left metal patch and the outer side feed point of the patch, the right end of the upper metal strip is relatively positioned between the two feed points of the right metal patch, the left end of the lower metal strip is relatively positioned between the two feed points of the left metal patch, and the right end of the lower metal strip is relatively positioned between the right edge of the right metal patch and the outer side feed point of the patch; Differential excitation produces a constant amplitude, inverted signal that is fed through a differential port into a rectangular metal patch, thereby producing a TM 10 mode on the rectangular metal patch and radiating outward.
2. 2. The differential decoupling antenna of claim 1, wherein the two rectangular metal patches are uniform in size, have a length of between 0.22λ 0 ~0.28λ 0 and a width of between 0.22λ 0 ~0.28λ 0 , have a spacing of between 0.022 λ 0 ~0.028λ 0 , and wherein λ 0 is a free space wavelength corresponding to the center frequency.
3. 3. The differential decoupling antenna of claim 2, wherein the center-to-center spacing between the feed points of two coaxial feed probes on the same rectangular metal patch is between 0.052λ 0 ~0.057λ 0 .
4. 4. A differential decoupling antenna as claimed in claim 3, wherein the two metallic strips are of uniform size, have a length of between 0.35 λ 0 ~0.40λ 0 and a width of between 0.010 λ 0 ~0.020λ 0 .
5. 5. The differential decoupling antenna of claim 4, wherein the two strips of metal are spaced apart from the upper and lower edges of the rectangular metal patch by a distance of between 0.01λ 0 ~0.02λ 0 .

Description

Differential decoupling antenna based on dislocation arrangement double strips Technical Field The present invention relates to an antenna for wireless communication, and more particularly, to a differential decoupling antenna. Background The differential antenna has better performance stability, reduces performance fluctuation caused by structural asymmetry, has strong anti-interference capability, and enhances the transmission efficiency of differential mode signals, thereby enhancing the anti-interference capability of the signals. Nowadays, with the rapid development of wireless communication, miniaturization of devices has become a necessary trend, and the necessity of closely arranged multi-element patch antenna arrays has become more and more prominent. However, when the differential antennas are closely arranged for space saving, there are many adverse effects such as poor matching, distortion of the pattern, and degradation of radiation performance due to mutual interference between the antennas. Therefore, the existing decoupling technology is mostly applied to the single feed antenna, so that the coupling between the single feed antennas can be reduced to a certain extent, but the decoupling technology cannot be directly applied to the differential feed antenna. The differential feed antenna has a plurality of feed ports and complex coupling paths. Therefore, there is a need for a method of reducing the mutual coupling between the elements of a multi-element differential antenna array. The prior art proposes a method for realizing high decoupling level by a decoupling network method, but the structural complexity, the radiator size and the center-to-center distance of the decoupling network are still insufficient in a large-scale MIMO system, and the requirement of a compact antenna array is difficult to meet. In order to reduce the complexity of the antenna structure, the characteristics of low mutual coupling and consistent radiation patterns are realized by the method of a characteristic mode and an H-shaped structure in the prior art, but the structural complexity still needs to be optimized, the center-to-center distance of the radiator and the size of the radiator are still larger, and the requirement of a compact antenna array still cannot be met. In summary, these existing methods have difficulty in reducing the radiator size, the radiator center-to-center spacing, and the structural complexity while achieving low mutual coupling. Disclosure of Invention Aiming at the prior art, the invention provides a differential decoupling antenna based on staggered arrangement of double strips, which simplifies the structure, reduces the center distance between radiators and the radiator size, and realizes radiation direction graphic coupling. The technical scheme is that the differential decoupling antenna based on the staggered arrangement double strips comprises a top metal layer, a middle dielectric substrate, a bottom metal ground and a feed structure; The top metal layer comprises two rectangular metal patches and two metal strips, wherein the two rectangular metal patches are distributed side by side, the two metal strips are respectively and horizontally distributed above and below the rectangular metal patches, and the two metal strips are mutually parallel and staggered for a certain length to form a decoupling structure; the feeding structure comprises four coaxial feeding probes, wherein the inner cores of the coaxial feeding probes are respectively inserted into the bottom metal from the underground direction vertically and correspondingly connected with a rectangular metal patch in pairs, feeding points are positioned on the horizontal symmetry axis of the patch, and two feeding probes connected with the same rectangular metal patch respectively form a pair of differential ports. Further, the left end of the upper metal strip is relatively positioned between the left edge of the left metal patch and the outer side feed point of the patch, the right end of the upper metal strip is relatively positioned between the two feed points of the right metal patch, the left end of the lower metal strip is relatively positioned between the two feed points of the left metal patch, and the right end of the lower metal strip is relatively positioned between the right edge of the right metal patch and the outer side feed point of the patch. Further, the two rectangular metal patches are consistent in size, have a length of 0.22 lambda 0~0.28λ0 and a width of 0.22 lambda 0~0.28λ0, and have a distance of 0.022 lambda 0~0.028λ0, wherein lambda 0 is a free space wavelength corresponding to the center frequency. Further, the center-to-center spacing between the feed points of two coaxial feed probes on the same rectangular metal patch is between 0.052λ 0~0.057λ0. Further, the two metal strips are identical in size, have a length of between 0.35 lambda 0~0.40λ0 and a width of between 0.010 lambda 0~0.020λ0.