阅读说明：本技术 一种多模宽带滤波微基站天线 (Multimode broadband filtering micro base station antenna ) 是由 张俊 杨立森 何启明 荣康 陈振俊 徐莎 陈卓著 于 2021-08-31 设计创作，主要内容包括：本发明涉及一种多模宽带滤波微基站天线,包括第一基板、第二基板、挖槽贴片、寄生环、微带线馈电结构、地板；第一基板的上表面设置有挖槽贴片；第二基板设置于第一基板的下方,且与第一基板平行,地板设置于第二基板的下表面；第二基板的上表面设置有寄生环和微带线馈电结构,寄生环对微带线馈电结构呈半包围,挖槽贴片和寄生环形成辐射体,能被微带线馈电结构同时激励,在频带内产生三个辐射模式和两个辐射零点。通过挖槽贴片和寄生环的设置,使天线通过挖槽贴片和寄生环时得到同时激励,产生三种辐射模式和两个辐射零点,保证天线在5G毫米波中的24.25GHz-27.5GHz频段保持低驻波比,在频段内具有良好带外噪声抑制的特点,实现稳定的辐射方向图特性和滤波性能。(The invention relates to a multimode broadband filtering micro base station antenna which comprises a first substrate, a second substrate, a slotted patch, a parasitic ring, a microstrip line feed structure and a floor, wherein the first substrate is provided with a first slot; the upper surface of the first substrate is provided with a grooving paster; the second substrate is arranged below the first substrate and is parallel to the first substrate, and the floor is arranged on the lower surface of the second substrate; the upper surface of the second substrate is provided with a parasitic ring and a microstrip line feed structure, the parasitic ring is in half-surrounding to the microstrip line feed structure, the slotted patch and the parasitic ring form a radiator which can be simultaneously excited by the microstrip line feed structure to generate three radiation modes and two radiation zeros in a frequency band. Through the arrangement of the slotted patch and the parasitic ring, the antenna is excited simultaneously when passing through the slotted patch and the parasitic ring, three radiation modes and two radiation zero points are generated, the antenna is guaranteed to keep a low standing-wave ratio in a 24.25GHz-27.5GHz frequency band in 5G millimeter waves, the characteristic of good out-of-band noise suppression is achieved in the frequency band, and stable radiation pattern characteristics and filtering performance are achieved.)

1. The multimode broadband filtering micro base station antenna is characterized by comprising a first substrate (1), a second substrate (2), a slotted patch (3), a parasitic ring (4), a microstrip line feed structure (5) and a floor (6);

the upper surface of the first substrate (1) is provided with a grooving paster (3);

the second substrate (2) is arranged below the first substrate (1) and is parallel to the first substrate (1), and the floor (6) is fixedly arranged on the lower surface of the second substrate (2);

the upper surface of the second substrate (2) is provided with the parasitic ring (4) and the microstrip line feed structure (5), the parasitic ring (4) is in half-surrounding to the microstrip line feed structure (5), the slotted patch (3) and the parasitic ring (4) form a radiator which can be simultaneously excited by the microstrip line feed structure (5) to generate three radiation modes and two radiation zeros in a required frequency band.

2. The multimode broadband filtering micro base station antenna according to claim 1, wherein the first substrate (1) and the second substrate (2) are both ceramic composite substrates.

3. The micro base station antenna with the multimode and the broadband filtering according to claim 2, wherein the ceramic composite substrate has a relative dielectric constant of 6 and a loss tangent of 0.001.

4. The multimode broadband filtering micro base station antenna according to claim 2, wherein the first substrate has a length of 0.21 λ c to 0.31 λ c, a width of 0.21 λ c to 0.31 λ c, and a thickness of 0.02 λ c to 0.06 λ c; the length of the second substrate is 0.25 lambda c-0.35 lambda c, the width of the second substrate is 0.21 lambda c-0.31 lambda c, and the thickness of the second substrate is 0.02 lambda c-0.06 lambda c; and λ c is the wavelength of the central frequency point in the free space.

5. The multimode broadband filtering micro base station antenna as claimed in claim 1, wherein the slotted patch (3) is an E-shaped slotted patch, the length is 0.12 λ c-0.22 λ c, the width is 0.15 λ c-0.20 λ c, and λ c is the wavelength of a central frequency point in free space.

6. The multimode broadband filtering micro base station antenna according to claim 5, wherein the notches of the E-shaped slotted patch are rectangular, the length of the rectangular notch is 0.08 λ c to 0.16 λ c, the width of the rectangular notch is 0.003 λ c to 0.030 λ c, and the spacing width of the rectangular notches from each other is 0.05 λ c to 0.15 λ c.

7. The multimode broadband filtering micro base station antenna according to claim 1, characterized in that the parasitic ring (4) is a zigzag parasitic ring.

8. The multimode broadband filtering micro base station antenna according to claim 7, wherein the length of the first half section of the parasitic ring in the shape of a Chinese character 'ji' is 0.03 λ c-0.09 λ c, the length of the middle half section is 0.10 λ c-0.15 λ c, the length of the second half section is 0.01 λ c-0.03 λ c, the width of all the sections is 0.003 λ c-0.010 λ c, and λ c is the wavelength of the central frequency point in free space.

9. The multimode broadband filtering micro base station antenna according to claim 1, wherein the microstrip feed structure (5) has a length of 0.120 λ c-0.200 λ c and a width of 0.020 λ c-0.040 λ c, and λ c is the wavelength of the central frequency point in free space.

10. The micro base station antenna of claim 1, wherein the radiators are excited by the microstrip line feed structure, and adjacent radiating structures are coupled to each other at electromagnetic frequencies to form a coupling enhanced broadband state, and the radiators have different electromagnetic field distribution states under excitation of different electromagnetic wave frequencies to excite multiple resonant modes for radiation, and have filtering performance in a desired frequency band.

Technical Field

The invention relates to the field of wireless communication, in particular to a multimode broadband filtering micro base station antenna.

Background

With the popularization of the fifth generation mobile communication system and the demand for miniaturization of communication equipment, a micro base station antenna, which is one of the main components in the micro base station system, needs to be redesigned to adapt to a new communication working frequency band, and the millimeter wave frequency band of the fifth generation mobile communication system is still in a rapid development stage at present, so that a micro base station antenna which can cover 24.25GHz-27.5GHz in the millimeter wave frequency band and has an excellent standing-wave ratio is very important.

The multimode antenna is an important method in designing a broadband antenna at present, and the antenna has the advantages of broadband, stable gain and miniaturization due to the fact that multiple modes can be put into a small antenna aperture. In the design process of the antenna, the requirement for meeting the parameter of the antenna needs to be considered, meanwhile, the size of the antenna needs to be reduced to adapt to the problem of location selection of the base station which is increasingly tense, the simple antenna structure can reduce the manufacturing cost and the maintenance cost, and the stability and the reliability of the base station are improved.

The filter antenna is an effective solution for miniaturization of a radio frequency front-end system, and the use of a filter can be reduced by loading a filter response into the antenna, so that the aim of miniaturization is fulfilled. The filtering micro base station antenna successfully inhibits out-of-band noise and reduces the volume of a communication system, the antenna is in a coupling enhancement state by digging grooves and adding parasitic rings on a rectangular patch of an antenna unit, currents with the same amplitude and the same direction are formed at high frequency and low frequency respectively to increase the roll-off rate of the antenna at an upper stop band and a lower stop band, the filtering response is loaded into the antenna to replace the effect of a filter, and meanwhile, the reduction of devices is beneficial to the miniaturization of the communication system.

Therefore, it is an urgent technical problem to provide a multimode broadband filtering micro base station antenna covering 5G millimeter wave frequency band and capable of maintaining high middle gain and high out-of-band rejection.

Among the existing technologies, chinese utility model patent CN212182533U discloses "base station antenna and multiband base station antenna", the public day is 18 days 12 months 2020, this base station antenna is along longitudinal extension, this base station antenna includes: a plurality of first radiating element columns configured to operate in a first operating frequency band, each first radiating element column comprising a plurality of first radiating elements arranged in a longitudinal direction; and a separation wall positioned between adjacent columns of first radiating elements and extending in the longitudinal direction, wherein the separation wall includes a frequency selective surface configured such that electromagnetic waves within the first operating frequency band are substantially blocked by the separation wall; the utility model discloses an in, solved the serious problem of mutual coupling phenomenon between the low band radiating element row, solved the poor problem of interband isolation performance between the low band radiating element row, but do not cover 5G millimeter wave frequency channel.

Disclosure of Invention

The invention provides a multimode broadband filtering micro base station antenna, aiming at solving the technical defects that the existing base station antenna can not cover a 5G millimeter wave frequency band and can keep high middle gain and high out-of-band rejection.

In order to realize the purpose, the technical scheme is as follows:

a multimode broadband filtering micro base station antenna comprises a first substrate, a second substrate, a slotted patch, a parasitic ring, a microstrip line feed structure and a floor;

the upper surface of the first substrate is provided with a grooving paster;

the second substrate is arranged below the first substrate and is parallel to the first substrate, and the floor is fixedly arranged on the lower surface of the second substrate;

the upper surface of the second substrate is provided with the parasitic ring and the microstrip line feed structure, the parasitic ring is in half-surrounding to the microstrip line feed structure, the slotted patch and the parasitic ring form a radiator which can be simultaneously excited by the microstrip line feed structure to generate three radiation modes and two radiation zeros in a required frequency band.

In the above scheme, through the arrangement of the slotted patch on the first substrate and the arrangement of the parasitic ring on the second substrate, the antenna is excited simultaneously when passing through the slotted patch and the parasitic ring, three radiation modes and two radiation zero points are generated, the antenna is ensured to keep a low standing-wave ratio in a 24.25GHz-27.5GHz frequency band in 5G millimeter waves, and the antenna has the characteristic of good out-of-band noise suppression in the frequency band, so that stable radiation pattern characteristics and good filtering performance can be realized.

Preferably, the first substrate and the second substrate are both ceramic composite substrates.

Preferably, the ceramic composite substrate has a relative dielectric constant of 6 and a loss tangent of 0.001.

Preferably, the first substrate has a length of 0.21 λ c to 0.31 λ c, a width of 0.21 λ c to 0.31 λ c, and a thickness of 0.02 λ c to 0.06 λ c; the length of the second substrate is 0.25 lambda c-0.35 lambda c, the width of the second substrate is 0.21 lambda c-0.31 lambda c, and the thickness of the second substrate is 0.02 lambda c-0.06 lambda c; and λ c is the wavelength of the central frequency point in the free space.

Preferably, the slotted patch is an E-shaped slotted patch, the length of the slotted patch is 0.12 lambdac-0.22 lambdac, the width of the slotted patch is 0.15 lambdac-0.20 lambdac, and lambdac is the wavelength of the central frequency point in free space.

Preferably, the notches of the E-shaped trenched patches are rectangular, the rectangular notches have a length of 0.08 λ c to 0.16 λ c and a width of 0.003 λ c to 0.030 λ c, and the rectangular notches are spaced apart from each other by a distance of 0.05 λ c to 0.15 λ c.

Preferably, the parasitic ring is a zigzag parasitic ring.

Preferably, the length of the first half section of the zigzag parasitic ring is 0.03 lambda c-0.09 lambda c, the length of the middle half section of the zigzag parasitic ring is 0.10 lambda c-0.15 lambda c, the length of the second half section of the zigzag parasitic ring is 0.01 lambda c-0.03 lambda c, the width of all the sections is 0.003 lambda c-0.010 lambda c, and lambda c is the wavelength of the central frequency point in free space.

Preferably, the microstrip line feed structure has a length of 0.120 λ c to 0.200 λ c, a width of 0.020 λ c to 0.040 λ c, and λ c is a wavelength of a central frequency point in free space.

Preferably, the radiator is excited by the microstrip line feed structure in a coupling manner, adjacent radiation structures are coupled with each other at a specific electromagnetic frequency and are in a coupling enhanced broadband state, the radiator has different electromagnetic field distribution states under excitation of different electromagnetic wave frequencies, and excites multiple resonance modes to radiate, and the radiator has a filtering performance in a required frequency band.

Compared with the prior art, the invention has the beneficial effects that:

according to the multimode broadband filtering micro base station antenna, due to the arrangement of the slotted patch on the first substrate and the arrangement of the parasitic ring on the second substrate, the antenna is excited simultaneously through the slotted patch and the parasitic ring to generate three radiation modes and two radiation zero points, the antenna is guaranteed to keep a low standing-wave ratio in a 24.25GHz-27.5GHz frequency band in 5G millimeter waves, the characteristic of good out-of-band noise suppression is achieved in the frequency band, and stable radiation pattern characteristics and good filtering performance can be achieved.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a top view of an E-shaped trenched patch of the present invention;

fig. 3 is a top view of the parasitic ring and microstrip feed structure of the present invention;

FIG. 4 is a graph of the S-parameters and input impedance of the multimode broadband filtering micro base station antenna of the present invention;

FIG. 5 is a graph of the S-parameters and gain of a multimode broadband filtering micro base station antenna of the present invention;

FIG. 6 is a radiation pattern of a multimode broadband filtering micro base station antenna of the present invention;

description of reference numerals: 1. a first substrate; 2. a second substrate; 3. digging a groove and sticking a piece; 4. a parasitic ring; 5. a microstrip line feed structure; 6. a floor board.

Detailed Description

The drawings are for illustrative purposes only and are not to be construed as limiting the patent;

the invention is further illustrated below with reference to the figures and examples.

Example 1

A multimode broadband filtering micro base station antenna comprises a first substrate 1, a second substrate 2, a slotted patch 3, a parasitic ring 4, a microstrip line feed structure 5 and a floor 6;

the upper surface of the first substrate 1 is provided with a grooving paster 3;

the second substrate 2 is arranged below the first substrate 1 and is parallel to the first substrate 1, and the floor 6 is arranged on the lower surface of the second substrate 2;

the upper surface of the second substrate 2 is provided with the parasitic ring 4 and the microstrip line feed structure 5, the parasitic ring 4 is in half-surrounding to the microstrip line feed structure 5, the slotted patch 3 and the parasitic ring 4 form a radiator, and the radiator can be simultaneously excited by the microstrip line feed structure 5 to generate three radiation modes and two radiation zeros in a required frequency band.

In the above scheme, through the arrangement of the slotted patch on the first substrate and the arrangement of the parasitic ring on the second substrate, the antenna is excited simultaneously through the slotted patch and the parasitic ring to generate three radiation modes and two radiation zero points, so that the 24.25GHz-27.5GHz frequency band of the antenna in 5G millimeter waves is ensured to keep a low standing wave ratio, and the antenna has the characteristic of good out-of-band noise suppression in the frequency band, and can realize stable radiation pattern characteristics and good filtering performance.

Preferably, the first substrate 1 and the second substrate 2 are both ceramic composite substrates.

Preferably, the ceramic composite substrate has a relative dielectric constant of 6 and a loss tangent of 0.001.

Preferably, the first substrate has a length of 0.21 λ c to 0.31 λ c, a width of 0.21 λ c to 0.31 λ c, and a thickness of 0.02 λ c to 0.06 λ c; the length of the second substrate is 0.25 lambda c-0.35 lambda c, the width of the second substrate is 0.21 lambda c-0.31 lambda c, and the thickness of the second substrate is 0.02 lambda c-0.06 lambda c; and λ c is the wavelength of the central frequency point in the free space.

Preferably, the slotted patch 3 is an E-shaped slotted patch, the length is 0.12 λ c to 0.22 λ c, the width is 0.15 λ c to 0.20 λ c, and λ c is the wavelength of the central frequency point in free space.

Preferably, the notches of the E-shaped trenched patches are rectangular, the rectangular notches have a length of 0.08 λ c to 0.16 λ c and a width of 0.003 λ c to 0.030 λ c, and the rectangular notches are spaced apart from each other by a distance of 0.05 λ c to 0.15 λ c.

Preferably, the parasitic ring 4 is a zigzag parasitic ring.

Preferably, the length of the first half section of the zigzag parasitic ring is 0.03 lambda c-0.09 lambda c, the length of the middle half section of the zigzag parasitic ring is 0.10 lambda c-0.15 lambda c, the length of the second half section of the zigzag parasitic ring is 0.01 lambda c-0.03 lambda c, the width of all the sections is 0.003 lambda c-0.010 lambda c, and lambda c is the wavelength of the central frequency point in free space.

Preferably, the microstrip line feed structure 5 has a length of 0.120 λ c to 0.200 λ c, a width of 0.020 λ c to 0.040 λ c, and λ c is a wavelength of a central frequency point in free space.

Example 2

As shown in fig. 1 to 6, the purpose of this embodiment may be to enable the E-shaped slotted patch and the parasitic ring with a shape like a Chinese character 'ji' to share a caliber by the arrangement of the E-shaped slotted patch and the parasitic ring with a shape like a Chinese character 'ji' on the upper surface of the first substrate 1, and to be capable of being simultaneously excited by the feeding port to have three working modes, such as the E-shaped slotted patch on the upper surface of the first substrate 1 forming a corresponding patch mode; the E-shaped grooves on the upper surface of the first substrate 1 form a corresponding groove pattern; if the patch mode is formed by the E-shaped slotted patch independently at the frequency of 1, the slot mode is influenced by the electromagnetic coupling of the E-shaped slotted patch 3, the parasitic ring 4 in the shape of Chinese character 'ji' and the microstrip line feed structure 5 to form a new slot mode, the parasitic ring 4 in the shape of Chinese character 'ji' and the microstrip line feed structure 5 are coupled to form a corresponding dipole mode, the bandwidth of the antenna is expanded, and therefore when the three working modes are started, the antenna is guaranteed to keep a low standing-wave ratio in a 5G millimeter wave frequency band, and a stable radiation pattern and good filtering performance are achieved in the frequency band.

Specifically, the specific position setting of the E-shaped grooving paster of the first substrate 1 and the specific position setting of the first substrate 1 and the second substrate 2 in this embodiment can be set by the designer according to the practical scene and the user's requirement. Preferably, the E-shaped trenched patches may be positioned in the middle of the first substrate 1 at equal distances from the substrate edges.

The E-shaped slotted patch and the n-shaped parasitic ring are mutually combined to form a radiator, the radiator is coupled and excited by the microstrip line feed structure 5, adjacent radiation structures are mutually coupled under specific electromagnetic frequency, the radiation unit has different electromagnetic field distributions under the excitation of different electromagnetic frequency, and a plurality of resonance modes are excited to radiate.

Furthermore, the media of the first substrate 1 and the second substrate 2 are ceramic composite substrates, and the ceramic composite substrates have the characteristics of miniaturization, easiness in installation and maintenance and the like.

Furthermore, the parasitic ring in the shape of a Chinese character 'ji' semi-surrounds the microstrip line feed structure 5, but does not directly contact with the microstrip line feed structure, and the parasitic ring in the shape of a Chinese character 'ji' is symmetrical left and right.

Further, the first substrate 1 is disposed above the second substrate 2, and the first substrate 1 and the second substrate 2 are tightly adhered to each other.

Further, the length L1 of the first substrate 1 is 0.21 λ c to 0.31 λ c, and the width W1 is 0.21 λ c to 0.31 λ c; the second substrate 2 has a length L2 of 0.25 λ c to 0.35 λ c and a width W2 of 0.21 λ c to 0.31 λ c. Preferably, the first substrate 1 and the second substrate 2 are made of a material having a relative dielectric constant of 6 and a loss tangent of 0.001, and preferably, the length L1 of the first substrate 1 is 0.26 λ c, and the width W1 is 0.26 λ c; the length L2 of the second substrate 2 is 0.30 λ c, and the width W2 is 0.26 λ c; the first and second substrates 2 are closely adhered to each other.

Furthermore, the length Lp of the E-shaped groove patch is 0.12 lambda c-0.22 lambda c, and the width Wp is 0.10 lambda c-0.20 lambda c. Preferably, the length Lp of the trenching patch 3 is 0.17 λ c, and the width Wp is 0.15 λ c.

Furthermore, the notches of the E-shaped slotted patch are rectangular, the length L3 of each rectangular notch is 0.08 lambda c-0.18 lambda c, the width W3 of each rectangular notch is 0.003 lambda c-0.015 lambda c, and the spacing width Ws between the rectangular notches is 0.05 lambda c-0.15 lambda c. Preferably, the length L3 of the rectangular notches is 0.13 λ c, the width W3 of the rectangular notches is 0.008 λ c, and the distance Ws between the rectangular notches is 0.10 λ c.

Further, the length L4 of the first half of the parasitic loop in the zigzag form is 0.03 λ c to 0.09 λ c, the length L5 of the middle half is 0.10 λ c to 0.15 λ c, the length L6 of the second half is 0.01 λ c to 0.03 λ c, preferably, the length L4 of the first half is 0.06 λ c, the length L5 of the middle half is 0.13 λ c, the length L6 of the second half is 0.02 λ c, and the width W4 of the entire loop is 0.003 λ c to 0.010 λ c. Preferably, the width W6 is 0.008 λ c.

Further, the length Lf of the microstrip-line feed structure 5 is 0.120 λ c to 0.200 λ c, and the width Wf is 0.020 λ c to 0.040 λ c, and preferably, the length Lf is 0.17 λ c, and the width Wf is 0.26 λ c.

Further, the length L2 of the floor panel 6 is 0.25 λ c to 0.35 λ c, the width W2 of the floor panel 6 is 0.21 λ c to 0.31 λ c, and preferably, the length L2 of the floor panel 6 is 0.30 λ c and the width W2 is 0.26 λ c.

In the three operation modes in the present embodiment, the patch mode resonant frequency can be adjusted by, but not limited to, the patch length Lp and the patch width Wp of the E-shaped slotted patch 3, the patch slot width W3 and the patch slot length L3, the feeder line length width, and other parameters; the resonant frequency of the groove mode can be adjusted by parameters such as but not limited to the length Lp of the E-shaped groove patch, the width W3 of the patch groove, the length L3 of the patch groove and the space width Ws between the patch grooves; the dipole mode resonance frequency can be adjusted by parameters such as but not limited to the length L4 of the first half section, the length L5 of the middle half section, the length L6 of the second half section, the width W4, the patch length Lp of the E-shaped slotted patch, the patch width Wp and the like;

the parameters of the working frequency, the central working frequency, the gain range in the working frequency band, and the like of the antenna provided in this embodiment may be set by a designer, for example, the working frequency of the antenna may be set to 24.25GHz-27.5GHz, the central working frequency may be set to 26GHz, and the gain range in the working frequency band of the antenna is set to 4.81 dBi-5.86 dBi, which is not limited in this embodiment.

Specifically, the specifications of the first substrate 1, the second substrate 2, the E-shaped trenched patch, and the parasitic ring in the shape of a Chinese character 'ji' in this embodiment may be:

the length L1 of the first substrate 1 is 2.00-4.00 mm, and the width W1 is 2.00-4.00 mm; the second substrate 2 has a length L2 of 2.00mm to 5.00mm and a width W2 of 2.00mm to 4.00 mm. Wherein, the first substrate 1 and the second thickness are 0.35 mm-0.86 mm. The first substrate 1 and the second substrate 2 are made of a substrate material with a relative dielectric constant of 6, a loss tangent of 0.001 and a thickness of 0.70mm to 0.836mm, wherein the first substrate 1 is arranged above the second substrate 2, and the first substrate 1 and the second substrate 2 are tightly adhered up and down.

The length Lp value of the E-shaped grooving paster is 1.35 mm-1.53 mm, and the width Wp is 1.15 mm-2.30 mm. The length L3 value of the rectangular groove on the E-shaped grooving paster is 0.92 mm-2.07 mm, the width W3 is 0.035 mm-0.150 mm, and the space width Ws between the paster grooves is 0.50 mm-0.17 mm. The length of the front half section of the parasitic ring in the shape of the Chinese character 'ji' is L4-1.10 mm, the length of the middle half section is L5-1.15 mm-1.80 mm, the length of the rear half section is L6-0.15 mm-0.30 mm, the length Lf value of the microstrip feeder line structure 5 with the section width W4 of 0.035 mm-0.35 mm is 1.4 mm-2.4 mm, and the width Wf is 0.15 mm-0.50 mm. The length L2 of the floor 6 is 2.00 mm-5.00 mm, and the W2 is 2.00 mm-4.00 mm.

Specifically, as shown in fig. 1 to 3, the length L1 of the first substrate 1 is set to 3.00mm, and the width W1 is set to 3.00 mm; the length L2 of the second substrate 2 is 3.50mm, and the width W2 is 3.00 mm; the two substrates are made of ceramic composite materials with the relative dielectric constant of 6 and the loss tangent of 0.001, the width h1 is 0.55mm, and the width h2 is 0.45 mm; the length Lp of the E-shaped slotted patch is 1.92mm, and the width Wp of the E-shaped slotted patch is 1.75 mm; the length L3 value of the rectangular groove on the E-shaped grooving paster is 1.47mm, the width W3 is 0.10mm, and the space width Ws between every two paster grooves is 1.20 mm; the length of the first half section of the parasitic ring in the shape of the Chinese character ji is L4 and is 0.70mm, the length of the middle half section is L5 and is 1.58mm, the length of the second half section is L6 and is 0.25mm, and the width of the section W4 is 0.10 mm. The microstrip line feed structure 5 has a length Lf of 2.00mm and a width Wf of 0.30 mm. The length L2 of the floor 6 is 3.50mm, and the width W2 is 3.00 mm; the first substrate 1 and the second substrate 2 are closely adhered.

As shown in FIG. 4, the center frequency is 26GHz, the input return loss in the frequency band of 24.1 GHz-28.4 GHz is less than-10 dB, the relative bandwidth is 16.4%, and the low frequency band of 5G millimeter waves is effectively covered.

As shown in fig. 5, the antenna has a stable gain in the operating frequency band, the lowest gain is 4.81dBi, and the highest gain is 5.86 dBi.

As shown in FIG. 6, the dashed line is the radiation pattern of 25GHz frequency along the Z-axis direction, the dotted line is the radiation pattern of 26GHz frequency along the Z-axis direction, and the solid line is the radiation pattern of 27GHz frequency along the Z-axis direction. The result shows that stable directional patterns and good directivity are always kept in the E-plane antenna and the H-plane antenna, so that the antenna has good radiation characteristics.

Preferably, the radiator is excited by the microstrip line feed structure in a coupling manner, adjacent radiation structures are coupled with each other at a specific electromagnetic frequency and are in a coupling enhanced broadband state, the radiator has different electromagnetic field distribution states under excitation of different electromagnetic wave frequencies, and excites multiple resonance modes to radiate, and the radiator has a filtering performance in a required frequency band.

It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.