Compact single-layer double-frequency patch antenna and antenna system for 5G terminal application

Abstract

The invention discloses a compact single-layer double-frequency patch antenna and an antenna system for 5G terminal application, particularly relates to the technical field of microwave communication, and solves the problems that although an antenna in the prior art realizes double-frequency work, the required plane size is relatively large; even if a part of the antenna adopts a half-mode patch, the antenna can effectively work in two frequency bands, and meanwhile, the compact size is kept; however, due to the existence of an air layer, the integration level is still relatively low, and the application is limited. According to the technical scheme, the dual-frequency antenna is realized by combining two half-mode patches, and dual-frequency work is successfully realized by using four modes; according to the invention, bandwidth enhancement is realized in a very compact size.

Description

Technical Field

[0001] The present invention relates to the field of microwave communication technology, and in particular to a compact single-layer dual-frequency patch antenna and an antenna system for 5G terminal applications. Background Art

[0002] The emergence of 5G technology has put forward high requirements for multiple-input multiple-output (MIMO) antennas, and the addition of new Sub-6G frequency bands (such as N78 and N79) has led to a significant increase in the number of antennas required for contemporary 5G terminals. However, the internal space of the terminal has long been occupied by many devices such as larger screens, cameras, batteries and even speakers, and has become increasingly crowded. In this way, the space left for terminal antennas is very limited. Therefore, antenna miniaturization and how to achieve multi-band coverage have become the focus of current research.

[0003] End-fire antennas can usually only be installed in the outer frame of the terminal, which limits their application. Patch antennas are favored for their small size, light weight and high manufacturing cost, and are an excellent choice for 5G terminals. Therefore, there is a lot of research on patch antennas. Many different methods for designing dual-band patch antennas have been proposed, such as using parasitic patches, gaps or metallized through holes. Although this antenna achieves dual-band operation, the required planar size is relatively large. Although some antennas use half-mode patches to achieve effective operation in both frequency bands while maintaining a compact size. However, the presence of the air layer makes the integration still relatively low, limiting its application. Therefore, how to achieve low-cost, high-integration dual-band operation in a compact size remains a challenge. Summary of the invention

[0004] Therefore, the present invention solves the technical problem that although the antenna in the prior art realizes dual-band operation, the required planar size is relatively large; although some antennas use half-mode patches to achieve effective operation in two frequency bands while maintaining a compact size; however, the existence of the air layer makes the integration level still relatively low, limiting its application; the present invention provides a compact single-layer dual-band patch antenna and antenna system for 5G terminal applications, which is realized by combining two half-mode patches, utilizing four modes to successfully realize dual-band operation, and achieves bandwidth enhancement in a very compact size.

[0005] The present invention provides a compact single-layer dual-frequency patch antenna for 5G terminal applications, comprising an antenna substrate, on which a metal patch for radiation is arranged; a slot for increasing bandwidth is arranged on the metal patch; dual-frequency operation is realized, and two high-order modes (TM) are connected. 0.5，2 mode) is moved to the 4.9 GHz frequency band to form dual-mode operation, and a metal ground is arranged under the antenna substrate.

[0006] Furthermore, the metal patch is provided with a metallized groove for dividing the metal patch and a metallized through hole for feeding. The metallized groove connected to the metal ground divides the metal patch into two half-mold patches. By combining the two half-mold patches, dual-frequency operation is successfully achieved using four modes, and bandwidth enhancement is achieved in a very compact size.

[0007] Furthermore, the metallized groove and the metallized through hole penetrate downwardly through the antenna substrate.

[0008] Furthermore, a probe structure is arranged on the metal ground, and the probe structure passes through the metallized through hole. The probe structure is used to transfer the energy of the feeding port to the metal patch.

[0009] Furthermore, the probe structure is connected to a feeding port on a metal ground.

[0010] Furthermore, the metallized groove is connected to the metal ground, and the metallized through hole is connected to the metal patch.

[0011] Furthermore, the dielectric constant of the antenna substrate is 4.4, the loss angle is 0.02, and the thickness is 2.5 mm.

[0012] The present invention also provides an antenna system, which is composed of the above-mentioned compact single-layer dual-frequency patch antenna array for 5G terminal applications.

[0013] Furthermore, the array angle of the antenna is ninety degrees.

[0014] Furthermore, the number of antenna arrays is four, thereby forming a 2×2 MIMO (Multiple Input Multiple Output) system. The antenna system is implemented using only one layer of substrate.

[0015] In the above technical solution, the technical effects and advantages provided by the present invention are:

[0016] 1. The compact single-layer dual-frequency patch antenna and antenna system for 5G terminal applications provided by the present invention are the first to integrate TM 0.5，0 Mode TM 0.5，2 The module is combined and successfully applied to the dual-frequency field of patch antennas. It can realize the MIMO function of microwaves while achieving microwave dual-band coverage, and has the excellent characteristics of high integration, low cost and compact size, which is of great practical value.

[0017] 2. The compact single-layer dual-frequency patch antenna and antenna system for 5G terminal applications provided by the present invention are realized by combining two half-mode patches, and four modes are used to successfully realize dual-frequency operation, achieving bandwidth enhancement in a very compact size.

[0018] 3. The compact single-layer dual-frequency patch antenna and antenna system for 5G terminal applications provided by the present invention can realize the dual-frequency operation of the patch antenna with only one substrate (without air layer), with high integration and low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] 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.

[0020] Figure 1a This is a structural diagram of the antenna unit of the present invention;

[0021] Figure 1b This is a schematic diagram of the metal patch structure of the present invention;

[0022] Figure 1c is a cross-sectional view of the antenna substrate of the present invention;

[0023] Figure 2 The antenna system diagram behind the antenna array of the present invention;

[0024] Figure 3a is a simulation result diagram of the impedance bandwidth of the antenna of the present invention;

[0025] Figure 3b This is a diagram of the isolation simulation results between the units of the antenna of the present invention;

[0026] Figure 4 is the simulation result of the envelope coefficient of the antenna of the present invention;

[0027] Figures 5a to 5d It is the simulated radiation pattern of the antenna of the present invention.

[0028] Description of reference numerals:

[0029] 1. Gap; 2. Metal patch; 3. Antenna substrate; 4. Metal ground; 5. Metallized groove; 6. Metallized through hole; 7. Probe structure; 8. Feed port. 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 compact single-layer dual-frequency patch antenna for 5G terminal applications, as shown in Figure 1. It mainly includes an antenna substrate 3, a metal ground 4 located below the antenna substrate 3, a metal patch 2 for radiation and a gap 1 for enhancing bandwidth located on the antenna substrate 3, a metallized groove 5 for dividing the metal patch 2 located on the antenna substrate 3, and a metallized through-hole 6 for feeding. A probe structure 7 for antenna feeding is provided on the upper surface of the metal ground 4, and the probe structure 7 is used to transfer the energy of the feeding port 8 to the metal patch 2. The metallized through-hole 6 is connected to the metal patch 2, and the metallized groove 5 is connected to the metal ground 4. While realizing microwave dual-band coverage, it can realize the MIMO function of microwaves, and has the excellent characteristics of high integration, low cost and compact size, which is of great practical value.

[0032] The metallized groove 5 connected to the metal ground 4 divides the metal patch 2 into two half-mode patches. In the 3.5GHz frequency band, both half-mode patches work in the fundamental mode, which is the TM0.5, 0 mode, and the two modes are combined to achieve dual-mode operation. Subsequently, in order to achieve dual-frequency operation, gaps 1 are set on the two metal patches 2 respectively, and the two high-order modes (TM0.5, 2 modes) are moved to the 4.9GHz frequency band to form dual-mode operation.

[0033] The dielectric constant of the antenna substrate used in this case is 4.4, the loss angle is 0.02, and the thickness is 2.5mm. The overall section height is 2.5mm (~ 0.028λ 0 @3.5 GHz). The impedance bandwidth and isolation between elements of the antenna are shown in Figure 3. For S11≤-10dB, the bandwidth range is 3.35–3.73GHz and 4.80–5.00GHz, which shows that the Sub-6 GHz band (N78 and N79) is well covered. The antenna envelope coefficient is shown in Figure 4 As shown, it is below 0.25, indicating good performance. Figure 5a to Figure 5d The antenna’s radiation patterns at 3.45 GHz, 3.65 GHz, 4.75 GHz, and 4.95 GHz on the xoz and yoz planes are shown in turn. It can be seen that the antenna unit radiation patterns have good complementary capabilities. These complementary radiation patterns indicate strong diversity performance, confirming the comprehensive spatial coverage capability of the MIMO system.

[0034] 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 compact single-layer dual-band patch antenna for 5G terminal applications, characterized in that: It comprises an antenna substrate (3), on which a metal patch (2) for radiation is arranged; on which a gap (1) for increasing bandwidth is arranged; and below the antenna substrate (3) a metal ground (4) is arranged.

2. The compact single-layer dual-frequency patch antenna for 5G terminal applications according to claim 1, characterized in that: The metal patches (2) are respectively provided with metallized grooves (5) for dividing the metal patches (2) and metallized through holes (6) for power feeding.

3. The compact single-layer dual-frequency patch antenna for 5G terminal applications according to claim 2, characterized in that: The metallized groove (5) and the metallized through hole (6) penetrate downwardly through the antenna substrate (3).

4. The compact single-layer dual-frequency patch antenna for 5G terminal applications according to claim 3, characterized in that: A feeding port (8) is provided on the metal ground (4), a probe structure (7) is provided at the feeding port (8), and the probe structure (7) passes through the metallized through hole (6).

5. The compact single-layer dual-frequency patch antenna for 5G terminal applications according to claim 4, characterized in that: The probe structure (7) is connected to a feeding port (8) on the metal ground (4).

6. The compact single-layer dual-frequency patch antenna for 5G terminal applications according to claim 5, characterized in that: The metallized groove (5) is connected to the metal ground (4), and the metallized through hole (6) is connected to the metal patch (2).

7. The compact single-layer dual-frequency patch antenna for 5G terminal applications according to claim 7, characterized in that: The antenna substrate (3) has a dielectric constant of 4.4, a loss angle of 0.02 and a thickness of 2.5 mm.

8. An antenna system, characterized in that: It is composed of a compact single-layer dual-frequency patch antenna array for 5G terminal applications as described in any one of claims 1 to 7.

9. The antenna system according to claim 8, characterized in that: The antenna array angle is ninety degrees.

10. The antenna system according to claim 9, characterized in that: The number of antenna arrays is four.

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