CN-122000674-A - Ultra-wideband MIMO antenna

Abstract

The invention is suitable for the technical field of wireless communication, and provides an ultra-wideband MIMO antenna which comprises a dielectric substrate, four antenna units, a DGS grounding plate and a splayed branch, wherein the four antenna units are symmetrically distributed on the front surface of the dielectric substrate in a central mode, each antenna unit comprises a radiation patch and a microstrip feeder connected with the radiation patch, the DGS grounding plate is arranged on the back surface of the dielectric substrate, a trapezoid groove and an arched door-shaped groove for realizing a notch function and broadband coverage are etched on each radiation patch, an I-shaped groove is etched on each DGS grounding plate, and the splayed branch is connected between DGS grounding plate areas corresponding to the two antenna units located at diagonal positions.

Inventors

• HUANG YUYU
• XU GUANGYI
• ZHANG WEIMIN
• HE XIN

Assignees

• 深圳东昇射频技术有限公司

Dates

Publication Date

20260508

Application Date

20260226

Claims (10)

1. 1. The ultra-wideband MIMO antenna comprises a dielectric substrate (2) and is characterized by further comprising four antenna units, wherein the four antenna units are distributed on the front surface of the dielectric substrate (2) in a central symmetry manner, and each antenna unit comprises a radiation patch (1) and a microstrip feeder (3) connected with the radiation patch (1); The antenna unit further comprises a DGS grounding plate (5), and the DGS grounding plate (5) is arranged on the back surface of the dielectric substrate (2); Wherein, each radiation patch (1) is etched with a trapezoid groove and a cambered door-shaped groove for realizing the notch function and broadband coverage; an I-shaped groove (4) is etched on the DGS grounding plate (5); And, the splayed branch (6) is connected between the DGS grounding plate (5) areas corresponding to the two antenna units positioned at the diagonal positions.
2. 2. The ultra wideband MIMO antenna of claim 1, wherein the operating band of the antenna covers two continuous wideband of 5.2GHz-13.2GHz and 14.5GHz-16.3GHz and has notch characteristics in the 13.2GHz-14.5GHz band.
3. 3. The ultra wideband MIMO antenna of claim 1, wherein the slot width of the trapezoidal slot increases gradually from 0.3mm to 0.9mm.
4. 4. Ultra wideband MIMO antenna according to claim 1, wherein the microstrip feed line (3) is of a trapezoid configuration.
5. 5. Ultra wideband MIMO antenna according to claim 1, characterized in that the splayed knots (6) are 4 symmetrically arranged between the DGS ground plane (5) areas corresponding to each pair of diagonally positioned antenna elements.
6. 6. Ultra wideband MIMO antenna according to any one of claims 1-5, wherein the dielectric substrate (2) is an FR4 material.
7. 7. Ultra wideband MIMO antenna according to claim 6, characterized in that the overall dimensions of the dielectric substrate (2) are 36mm x 1.635mm.
8. 8. The ultra wideband MIMO antenna of claim 6, wherein the FR4 material has a dielectric constant of 4.4 and a thickness of 1.6mm.
9. 9. The ultra wideband MIMO antenna according to any one of claims 1-5, wherein the isolation parameter S 21 、S 31 、S 41 between the antenna elements is higher than 15dB in the 5-16GHz band.
10. 10. The ultra wideband MIMO antenna of any one of claims 1-5, wherein the notch has a depth exceeding-5 dB in the 13.2-14.5GHz band.

Description

Ultra-wideband MIMO antenna Technical Field The invention relates to the technical field of wireless communication, in particular to an ultra-wideband MIMO antenna. Background As modern wireless communication systems evolve toward wideband, high capacity, high reliability, the combination of Ultra Wideband (UWB) technology with Multiple Input Multiple Output (MIMO) architecture has become an important means of improving communication rate and reliability. On moving platforms such as unmanned aerial vehicles, high-speed aircrafts and the like, the antenna not only needs to have broadband coverage capability, but also needs to realize multi-channel high isolation in a limited space, and can avoid co-frequency interference with the existing system in a complex electromagnetic environment. At present, MIMO antenna design facing missile-borne, airborne and other scenes still faces the following three key problems: 1) The coupling between MIMO channels is serious, the mutual coupling between antenna units is strong, the isolation degree is reduced (often lower than 10 dB), and the spatial multiplexing gain and the channel capacity of the MIMO system are affected; 2) Lack of frequency band suppression capability, lack of active suppression mechanism for specific interference frequency bands (such as satellite uplink frequency bands), and easiness in causing intra-system or inter-system interference; 3) The design limitation of the grounding plate is that although the common complete grounding plate is convenient to process, the flexibility of impedance matching is limited, and good matching and radiation efficiency improvement in an ultra-wideband range are difficult to realize. Therefore, in view of the above situation, there is an urgent need to provide an ultra wideband MIMO antenna to overcome the shortcomings in the current practical applications. Disclosure of Invention The present invention is directed to an ultra wideband MIMO antenna, which is designed to solve the above-mentioned problems in the prior art. The invention is realized in that an ultra wideband MIMO antenna comprises: A dielectric substrate; the four antenna units are distributed on the front surface of the dielectric substrate in a central symmetry manner, and each antenna unit comprises a radiation patch and a microstrip feeder line connected with the radiation patch; the antenna unit further comprises a DGS grounding plate, and the DGS grounding plate is arranged on the back surface of the medium substrate; Wherein, each radiation patch is etched with a trapezoid groove and a arched door-shaped groove for realizing the notch function and broadband coverage; An I-shaped groove is etched on the DGS grounding plate; And splayed branches are connected between the DGS grounding plate areas corresponding to the two antenna units positioned at diagonal positions. As a further scheme of the invention, the working frequency band of the antenna covers two continuous wideband of 5.2GHz-13.2GHz and 14.5GHz-16.3GHz, and has notch characteristic in the frequency band of 13.2GHz-14.5 GHz. As a further proposal of the invention, the groove width of the trapezoid groove is gradually increased from 0.3mm to 0.9mm. As a further scheme of the invention, the microstrip feeder is of a trapezoid structure. As a further scheme of the invention, the eight-word branches are 4 and symmetrically arranged between the DGS grounding plate areas corresponding to each pair of the antenna units at the diagonal positions. As a further scheme of the invention, the dielectric substrate is made of FR4 material. As a further proposal of the invention, the overall size of the dielectric substrate is 36mm multiplied by 1.635mm. As a further aspect of the invention, the FR4 material has a dielectric constant of 4.4 and a thickness of 1.6mm. As a further scheme of the invention, the isolation parameter S 21、S31、S41 between the antenna units is higher than 15dB in the 5-16GHz frequency band. As a further scheme of the invention, the depth of the notch exceeds-5 dB in the frequency band of 13.2-14.5 GHz. Compared with the prior art, the invention has the beneficial effects that: 1. The invention has double broadband coverage, and the antenna has S11< -10dB in two frequency bands of 5.2-13.2GHz and 14.5-16.3GHz, thereby meeting the comprehensive requirements of ultra-broadband communication, radar sensing and satellite data link. 2. The invention has high isolation performance, the isolation (S 21、S31、S41) between antenna units is higher than 15dB in the full frequency band of 5-16GHz, the mutual coupling of channels is effectively inhibited, and the frequency spectrum efficiency of the MIMO system is improved. 3. The invention has compact structure, easy integration, low antenna section and light weight, adopts a single-layer microstrip structure and a defected ground design, and is suitable for conformal installation on the surface of an aircraft. 4. The invention can realize accur