Difunctional antenna based on magnetoelectric dipole structure multiplexing

Abstract

The invention discloses a dual-function antenna based on multiplexing of a magnetoelectric dipole structure, particularly relates to the technical field of communication, and solves the problems that in the prior art, two or more antennas are generally needed to support two communication systems, so that the occupied area of a system is too large, and the communication efficiency is low. And the urgent pursuit of the terminal antenna for miniaturization and lightening and thinning is not met. According to the technical scheme, a three-port MIMO antenna of the 5.8 GHz WIFI frequency band is arranged, one port can achieve broadband operation, and the 5G cellular mobile communication N79 frequency band and the 5.8 GHz WIFI frequency band can be covered at the same time; according to the invention, 5G cellular network communication and WIFI communication can be supported at the same time.

Description

Technical Field

[0001] The present invention relates to the technical field of microwave communications, and in particular to a dual-function antenna based on magneto-electric dipole structure multiplexing. Background Art

[0002] The original MIMO antenna was realized by arranging two or more radiating elements at a certain distance, but this method generally requires the introduction of decoupling technology, such as neutralization lines, defective ground structures, parasitic elements, and decoupling feed networks, which will inevitably lead to a relatively large footprint for the antenna. In addition, since this method has multiple radiating elements and additional decoupling elements, its application scenarios will also be subject to certain restrictions.

[0003] Subsequently, some studies proposed MIMO antennas based on sharing the same radiating surface. It can integrate multiple ports on a radiating element to reduce the number of radiating elements, so the antenna size is relatively small. Some studies have achieved MIMO functions by stimulating different parts of the same radiator, and improved port isolation by slotting and introducing short-circuit vias. Some two-port MIMO antennas are designed and implemented using the method of mode cancellation, that is, by analyzing the common-mode and differential-mode impedances of different ports of the antenna to achieve better isolation between ports. Polarization diversity and pattern diversity are also commonly used methods for designing MIMO antennas with shared radiating surfaces. Polarization diversity refers to stimulating different ports to achieve mutually orthogonal polarization directions, so that a single radiating element presents different polarization modes, thereby realizing MIMO functions. Pattern diversity refers to achieving different maximum radiation directions of the antenna when stimulating different ports, thereby achieving isolation between ports.

[0004] Although the above antennas realize MIMO functions based on shared radiating elements, some antennas still have a high profile, and most of them are two-port MIMO antennas. Although some of them are designed with three ports or more ports to excite the same radiating element to realize MIMO functions, most of these antennas only involve MIMO functions in a single frequency band. And because 5G cellular network communication and WIFI communication belong to two different communication systems, if according to traditional design ideas, two or more antennas are usually required to support these two communication systems. This will cause the system to occupy too much area, which does not meet the urgent pursuit of miniaturization and lightness of terminal antennas. Summary of the invention

[0005] Therefore, the present invention solves the technical problem that in the prior art, antennas usually need two or more antennas to support two communication systems, which results in the system occupying too much area and does not meet the urgent pursuit of miniaturization and lightness of terminal antennas; the present invention provides a dual-function antenna based on magnetoelectric dipole structure multiplexing, which is based on magnetoelectric dipole structure multiplexing technology to realize an antenna that can simultaneously support two communication systems, 5G cellular network communication and WIFI communication, and realizes a three-port MIMO antenna in the 5.8GHz WIFI frequency band, one of which can realize broadband operation, and can simultaneously cover the 5G cellular mobile communication N79 frequency band and the 5.8GHz WIFI frequency band.

[0006] The present invention provides a dual-function antenna based on magnetoelectric dipole structure multiplexing, comprising a feed substrate, a metal ground, a dielectric substrate and a microstrip patch structure arranged in sequence from bottom to top; a gap is arranged on the microstrip patch structure. Two feed probes are arranged below the feed substrate; the two feed probes pass through the feed substrate, the metal ground and the dielectric substrate upward. A microstrip line feeding structure is arranged on the lower surface of the feed substrate. The microstrip feed structure constitutes port #1, the two metal probes constitute port #2 and port #3, and the gap engraved on the microstrip patch structure is used to improve the isolation between port #1 and port #2 and port #3.

[0007] Furthermore, a rectangular gap is arranged on the metal floor.

[0008] Furthermore, a metallized groove is provided on the dielectric substrate.

[0009] Furthermore, the microstrip patch structure located above the dielectric substrate forms an electric dipole.

[0010] Furthermore, the metallized grooves on the dielectric substrate serve as conductive walls of the magneto-electric dipole antenna, which work together with the gaps on the patch structure as magnetic dipoles.

[0011] Furthermore, the rectangular gap is used for magneto-electric dipole feeding.

[0012] In the above technical solution, the technical effects and advantages provided by the present invention are:

[0013] 1. Based on the magnetoelectric dipole structure multiplexing technology, the present invention realizes a three-port MIMO antenna in the 5.8GHz WIFI band by cleverly multiplexing the magnetoelectric dipole antenna structure, wherein one port can realize broadband operation covering both the 5G N79 band and the 5.8GHz WIFI band. The antenna can simultaneously support 5G cellular network communication and WIFI communication.

[0014] 2. The present invention can realize two functions, namely, a magnetoelectric dipole broadband antenna operating in the 5G N79 frequency band and a 5.8GHz WIFI band three-port MIMO antenna based on a shared radiator. The three-port MIMO antenna has a pattern diversity characteristic, and the switching between the dual-beam forward and backward radiation pattern and the single-beam top radiation pattern is realized by flexibly exciting different ports. At the same time, the antenna is designed to have a high degree of integration, which greatly reduces the size of the antenna and meets the diverse needs of future mobile communication antennas.

[0015] 3. The present invention can simultaneously support two different communication systems: 5G cellular network communication and WIFI communication. A three-port MIMO antenna with a shared radiator is implemented in WIFI (5.8GHz band), one of which can achieve broadband operation covering both the 5G N79 band and the 5.8GHz WIFI band. When used as a 3MIMO antenna, different radiation patterns can be obtained by stimulating different radiation structures, realizing dual-beam forward and backward radiation patterns and single-beam top radiation pattern antennas, and at the same time, each port has good isolation. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0017] Figure 1 It is a schematic diagram of the overall structure of the antenna of the present invention;

[0018] Figure 2 The figure is a simulation result diagram of the reflection coefficient and gain of the magnetoelectric dipole antenna of the present invention in the 5 GHz frequency band;

[0019] Figure 3a The antenna radiation pattern of the magnetoelectric dipole antenna of the present invention at 4.92 GHz;

[0020] Figure 3b The antenna radiation pattern of the magnetoelectric dipole antenna of the present invention at 5.4 GHz;

[0021] Figure 3c The antenna radiation pattern of the magnetoelectric dipole antenna of the present invention at 5.8 GHz;

[0022] Figure 4 This is the S parameter diagram of the WIFI (5.8 GHz frequency band) 3MIMO antenna of the present invention;

[0023] Figure 5This is a correlation coefficient diagram of the present invention in WIFI (5.8 GHz frequency band) 3MIMO antenna;

[0024] Figure 6a The present invention radiates a 3D pattern at the top of a WIFI (5.8 GHz frequency band) 3MIMO antenna;

[0025] Figure 6b The present invention is a 3D directional diagram of dual-beam radiation of 3MIMO antenna in WIFI (5.8GHz frequency band);

[0026] Figure 7 The radiation pattern of the present invention at WIFI (5.8 GHz frequency band) 3MIMO antenna port 1;

[0027] Figure 8 This is the radiation pattern of the 3MIMO antenna port 2 of the present invention in WIFI (5.8 GHz frequency band).

[0028] Description of reference numerals:

[0029] 1. Microstrip patch structure; 2. Gap; 3. Metallized groove; 4. Dielectric substrate; 5. Metal ground; 6. Rectangular gap; 7. Feed substrate; 8. Microstrip line feeding structure; 9. Feed probe. DETAILED DESCRIPTION

[0030] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0031] This embodiment provides a dual-function antenna based on magneto-electric dipole structure reuse, such as Figure 1 As shown. It mainly includes: dielectric substrate 4, metal ground 5, feed substrate 7, microstrip line feed structure 8, feed probe 9, microstrip patch structure 1 located above dielectric substrate 4 to form electric dipole, metallized slot 3 located on dielectric substrate 4 as the conductive wall of magneto-electric dipole antenna, which works together with the slot on the patch structure as magnetic dipole. Slot 2 is engraved on microstrip patch structure 1 to improve the isolation between port #1 and port #2 and port #3; rectangular slot 6 is provided on metal ground 5 for magneto-electric dipole feeding.

[0032] When the antenna works independently as a magnetoelectric dipole, the signal is fed from the feed port #1 and excites the magnetoelectric dipole antenna through the rectangular slot 6 structure to achieve broadband operation and cover the N79 frequency band of the 5G cellular mobile communication antenna.

[0033] When the antenna works as a three-port MIMO antenna, a MIMO antenna with pattern diversity characteristics in the WIFI (5.8GHz) frequency band is realized: when the signal is fed into port #2 or #3 of the antenna, the signal excites the PIFA antenna through the feeding probe 9, covers the 5.8GHz WIFI frequency band, and realizes a dual-beam radiation pattern; when the signal is fed into port #1 of the antenna, the signal excites the magnetoelectric dipole antenna through the microstrip line feeding structure 8, covers the 5G N79 frequency band and the 5.8GHz WIFI frequency band at the same time, and realizes a single-beam top radiation pattern. A gap 2 is provided on the microstrip patch structure 1 to improve the isolation between the magnetoelectric dipole antenna and the PIFA antenna. At the same time, since the PIFA antenna uses a high-order mode, there is good isolation between port #2 and port #3.

[0034] In this embodiment, the dielectric substrate 4 has a dielectric constant of 3.55, a loss angle of 0.0027, and a thickness of 3.248 mm. The feed substrate 7 has a dielectric constant of 3.55, a loss angle of 0.0027, and a thickness of 0.305 mm.

[0035] The overall section height is 3.553mm (~ 0.059λ 0 @5 GHz), plane size 55mm×50mm(~0.92×0.92λ0 2 @5GHz).

[0036] When the antenna works independently as a magnetoelectric dipole, its antenna transmission response is as follows Figure 2 As shown, the bandwidth range is 4.72-6.01 GHz, covering the 5GN79 frequency band, and the gain within the band is 5.2-7.12 dBi. Figure 3 shows the antenna radiation pattern of the magneto-electric dipole antenna at 4.92 GHz, 5.4 GHz and 5.8 GHz.

[0037] Figure 4 This is the S parameter diagram of the WIFI (5.8GHz band) 3MIMO antenna. Port #1 achieves broadband, covering the 4.72-6.01GHz band, and ports #2 and #3 cover the 5.56-6.01GHz band. The isolation between port #1 and port #2 within the band is greater than 15dB, and the isolation between port #2 and port #3 within the band is greater than 20dB. The correlation coefficients of the proposed 3MIMO antenna are shown in Figure 5 As shown, the correlation coefficient of the antenna is much less than 0.02, which meets the design requirements of the MIMO antenna. Figure 6 is a schematic diagram of the directional pattern diversity performance of the 3MIMO antenna at 5.78 GHz. Figure 7 The radiation patterns of three frequency points of 3MIMO antenna port #1 are shown, namely 5.64 GHz, 5.78 GHz and 5.9 GHz, showing good top radiation. Figure 8The radiation patterns of the three frequency points of the 3MIMO antenna port #2 are shown, which are 5.64GHz, 5.78GHz, and 5.9GHz, respectively. The dual-beam radiation pattern of the antenna is stable within the frequency band and the radiation pattern is good.

[0038] The above description is only by way of illustration of certain exemplary embodiments of the present invention. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A dual-function antenna based on magneto-electric dipole structure multiplexing, characterized in that: The invention comprises a feeding substrate (7), a metal ground (5), a dielectric substrate (4) and a microstrip patch structure (1) which are arranged in sequence from bottom to top; a gap (2) is arranged on the microstrip patch structure (1).

2. The dual-function antenna based on magneto-electric dipole structure multiplexing according to claim 1, characterized in that: Two feeding probes (9) are arranged below the feeding substrate (7); the two feeding probes (9) pass through the feeding substrate (7), the metal ground (5) and the dielectric substrate (4) in sequence upwards.

3. The dual-function antenna based on magneto-electric dipole structure multiplexing according to claim 2, characterized in that: A microstrip line feeding structure (8) is provided on the lower surface of the feeding substrate (7).

4. The dual-function antenna based on magneto-electric dipole structure multiplexing according to claim 3, characterized in that: A rectangular gap (6) is provided on the metal ground (5).

5. The dual-function antenna based on magneto-electric dipole structure multiplexing according to claim 4, characterized in that: Two groups of metallized grooves (3) are arranged on the dielectric substrate (4).

6. The dual-function antenna based on magneto-electric dipole structure multiplexing according to claim 5, characterized in that: The microstrip patch structure (1) located above the dielectric substrate (4) forms an electric dipole.

7. The dual-function antenna based on magneto-electric dipole structure multiplexing according to claim 7, characterized in that: The metallized groove (3) located on the dielectric substrate (4) serves as a conductive wall of the magnetoelectric dipole antenna, and works together with the gap between the patch structures (1) as a magnetic dipole.

8. The dual-function antenna based on magneto-electric dipole structure multiplexing according to claim 8, characterized in that: The rectangular gap (6) is used for magnetoelectric dipole feeding.

9. The dual-function antenna based on magneto-electric dipole structure multiplexing according to claim 8, characterized in that: The dielectric substrate (4) has a dielectric constant of 3.55, a loss angle of 0.0027 and a thickness of 3.248 mm.

10. The dual-function antenna based on magneto-electric dipole structure multiplexing according to claim 9, characterized in that: The dielectric constant of the feeding substrate (7) is 3.55, the loss angle is 0.0027, and the thickness is 0.305 mm.

Images