CN-115663464-B - Ku wave band structure complementary miniature high-isolation microstrip MIMO antenna

CN115663464BCN 115663464 BCN115663464 BCN 115663464BCN-115663464-B

Abstract

The application designs a Ku-band structure complementary miniaturized high-isolation microstrip MIMO antenna, which comprises a first unit antenna structure, a second unit antenna structure, a dielectric substrate, a metal grounding plate and an isolation rectangular patch, wherein the metal grounding plate is arranged on the lower surface of the dielectric substrate, the first unit antenna structure, the second unit antenna structure and the isolation rectangular patch are attached to the upper surface of the dielectric substrate, the isolation rectangular patch is arranged between the first unit antenna structure and the second unit antenna structure, the first unit antenna structure comprises the rectangular metal patch and a first feed microstrip line, the second unit antenna structure comprises a square-fork type metal structure and a second feed microstrip line, the metal grounding plate is used as an isolator, the coupling between unit antennas is reduced, the rectangular metal patch is connected to the metal grounding plate, the isolation of electromagnetic coupling energy is realized, and meanwhile, the microstrip MIMO antenna designed by the application can be simultaneously applied to satellite data transmission and signal reception.

Inventors

LI DONG
LI HAIXIONG
BAI YANYAN
LIU HANYE
LI QIANG
ZHANG KAIYU
LU LEI

Assignees

榆林学院

Dates

Publication Date: 20260508
Application Date: 20220525

Claims (5)

1. The Ku band structure complementary miniaturized high-isolation microstrip MIMO antenna is characterized by comprising a first unit antenna structure, a second unit antenna structure, a dielectric substrate (10), a metal grounding plate (20) and an isolated rectangular patch (19); The first unit antenna structure, the second unit antenna structure and the isolation rectangular patch (19) are attached to the upper surface of the dielectric substrate (10); The isolation rectangular patch (19) is arranged between the first unit antenna structure and the second unit antenna structure; The metal grounding plate (20) is arranged on the lower surface of the dielectric substrate (10); the first unit antenna structure comprises a rectangular metal patch (12) and a first feed microstrip line (13); the first feed microstrip line (13) is arranged at the center of the lower edge of the rectangular metal patch (12); the geometric center of the rectangular metal patch (12) coincides with the geometric center of the top of the dielectric substrate (10); The second unit antenna structure comprises a square fork type metal structure (15) and a second feed microstrip line (14); The second feed microstrip line (14) is arranged at the midpoint of the patch at the upper side of the square fork-shaped metal structure (15); the square fork type metal structure (15) is downwards in an opening structure; the three sides of the square fork type metal structure (15) have the same width; The left and right sides of the square fork type metal structure (15) are equal to the space between the middle rectangular metal patches (12); The distance between the upper side of the square fork type metal structure (15) and the middle rectangular metal patch (12) is larger than the distance between the left side and the right side of the square fork type metal structure (15) and the middle rectangular metal patch (12); The isolation rectangular patch (19) and the dielectric substrate (10) are provided with metallized through holes, and the isolation rectangular patch (19) is connected with a metal grounding plate (20) at the bottom of the dielectric substrate (10) through the metallized through holes; Grid-shaped metal patches are arranged on the outer sides of the left metal arm and the right metal arm of the square fork-shaped metal structure (15); The grid-shaped metal patch comprises a first grid-shaped metal patch (17) and a second grid-shaped metal patch (11); The included angles between the grid bars of the first grid-shaped metal patch (17) and the second grid-shaped metal patch (11) and the edges of the left and right side arms of the square fork-shaped metal structure (15) are the same, and the included angle is smaller than 90 degrees.
2. The Ku band structure complementary miniaturized high isolation microstrip MIMO antenna of claim 1, wherein, The first grid-shaped metal patch (17) is arranged on the left side of the square fork-shaped metal structure (15); the second grid-shaped metal patch (11) is arranged on the right side of the square fork-shaped metal structure (15).
3. The Ku band structure complementary miniaturized high isolation microstrip MIMO antenna of claim 2, wherein the grating shapes of the first grating-shaped metal patch (17) and the second grating-shaped metal patch (11) are the same; the grid shapes of the first grid-shaped metal patch (17) and the second grid-shaped metal patch (11) are parallelograms.
4. The Ku-band structure-complementary miniaturized high-isolation microstrip MIMO antenna according to any one of claim 1 or 2, wherein, The first grid-shaped metal patch (17) and the second grid-shaped metal patch (11) are mirror symmetry with the vertical central line of the upper surface of the dielectric substrate (10) as an axis.
5. The Ku band structure complementary miniaturized high isolation microstrip MIMO antenna of claim 1, wherein the dielectric substrate (10) is made of polytetrafluoroethylene FR4, has a dielectric constant of 4.4 and a loss tangent of 0.02; the metal grounding plate (20) is made of copper; The first unit antenna structure, the second unit antenna structure and the isolated rectangular patch (19) are made of materials different from those of the metal grounding plate (20).

Description

Ku wave band structure complementary miniature high-isolation microstrip MIMO antenna Technical Field The invention belongs to the field of antennas in basic electrical elements, and particularly relates to a Ku-band structure complementary miniature high-isolation microstrip MIMO antenna. Background The 5G wireless communication technology has higher requirements on the coverage of wireless mobile signals, and in densely populated cities, the wireless mobile signal coverage effect is better, and in rural areas with smaller population density, or in barren mountains and wild fields, the wireless mobile signals are not available or are worse. The satellite chain technology can overcome the problem of poor coverage of wireless mobile signals, realize the global coverage of wireless signals, and the method for realizing the coverage of wireless mobile signals mainly comprises the steps of transmitting wireless signals to the ground through satellites, receiving signals with data from the satellites by ground receiving signal equipment, and further realizing information transmission, wherein the satellites and the ground receiving signal equipment commonly use Ku wave bands to realize communication. As a means for effectively improving the data transmission rate between the satellite and the ground receiving signal device, in all wireless mobile communications, as the transmission data increases, the requirement of the Ku-band MIMO antenna will increase. Chinese patent CN106099335A discloses a low-profile full-band WLAN-MIMO indoor distributed antenna with an orthogonal or circumferential radiation body, the antenna is composed of a transverse dielectric plate, a longitudinal dielectric plate, a reflecting plate, a balun, and a back strip and a vibrator made by copper-clad technology, the antenna is a high-gain miniaturized MIMO antenna capable of covering the WLAN full-band, and the antenna adjusts the performance such as the working band, the antenna gain, the antenna directivity, etc. of the ultra-wideband antenna by changing the relative position of the back strip and the vibrator and generating an inductive capacitance by coupling the back strip and the vibrator. But it is difficult to popularize in civil systems because of the large main radiation lobe and poor directivity of planar antennas. The high-isolation MIMO antenna with the complementary semicircular structure disclosed in the Chinese patent CN109494463A comprises a first antenna unit and a second antenna unit which are orthogonally arranged on a dielectric substrate, wherein the structures of the two antenna units are composed of a semicircular metal patch and a rectangular metal patch, a polarization diversity technology is adopted, so that the coupling between the two antenna units is small, the high-port isolation is realized, and the distance between the two antenna units is smaller than one wavelength, so that the size of the MIMO system comprising the two antenna units is obviously reduced, and the miniaturization effect is realized. But the structure of each radiating element in an array multi-antenna system is identical, so that structural complementarity cannot be achieved and space occupation is too large. At present, satellites are commonly used in the sub-6GHz frequency band, but currently, the number of MIMO antennas capable of being applied to the Ku band is small, so that it is particularly important to design a structure complementary miniature high-isolation microstrip MIMO antenna capable of being applied to satellite data transmission and signal reception. Disclosure of Invention In order to solve the problems, a structure complementary miniaturized high-isolation microstrip MIMO antenna capable of being applied to satellite data transmission and signal reception is designed, and therefore miniaturization and high isolation of a Ku wave band structure antenna are achieved. In order to achieve the effect, the invention designs the Ku band structure complementary miniaturized high-isolation microstrip MIMO antenna. The utility model provides a complementary miniaturized high isolation microstrip MIMO antenna of Ku wave band structure, it includes, first unit antenna structure, second unit antenna structure, dielectric substrate, metal ground plate, isolation rectangle paster; The metal grounding plate is arranged on the lower surface of the dielectric substrate; The first unit antenna structure, the second unit antenna structure and the isolated rectangular patch are attached to the upper surface of the dielectric substrate; The isolated rectangular patch is arranged between the first unit antenna structure and the second unit antenna structure. Preferably, the first unit antenna structure includes a rectangular metal patch and a first feeding microstrip line; The first feed microstrip line is arranged at the center of the lower edge of the rectangular metal patch; the geometric center of the rectangular metal patch coincides wi