An elongated 5G dual-band shorted patch antenna for terminal applications

Abstract

The application belongs to the technical field of microwave communication and specifically relates to an elongated 5G dual-band short-circuit patch antenna for terminal application. The application comprises an upper surface rectangular metal main patch, a substrate and a metal ground arranged in a top-down stacking mode. A first rectangular metal parasitic patch is arranged on the left side of the upper surface rectangular metal main patch, and a second rectangular metal parasitic patch is arranged on the right side of the upper surface rectangular metal main patch. The upper surface rectangular metal main patch, the first rectangular metal parasitic patch and the second rectangular metal parasitic patch are each arrayed with a plurality of grounding through holes at one end along the Y-axis direction. The antenna further comprises a coaxial feeding structure. The upper surface rectangular metal main patch is engraved with a vertical first slit along the X-axis direction. The upper surface rectangular metal main patch is engraved with a second slit symmetrically centered on the vertical first slit along the Y-axis direction. The first rectangular metal parasitic patch is horizontally engraved with a third slit along the Y-axis direction. The second rectangular metal parasitic patch is horizontally engraved with a fourth slit along the Y-axis direction.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of microwave communication, and particularly relates to an elongated 5G dual-band short-circuit patch antenna for terminal application. BACKGROUND

[0002] 5G has a greatly increased requirement for information transmission rate, and needs to have a wider absolute bandwidth as support. The N78 frequency band is the 5G main frequency band of China Telecom and China Unicom, and the frequency band range is 3.4GHz-3.6GHz. The N79 frequency band is the 5G main frequency band of China Mobile, and the frequency band range is 4.8GHz-5GHz. In recent years, the pursuit of large screens, large cameras, large batteries and even large loudspeakers by manufacturers occupies a large amount of internal space of terminal devices, and the space left for the antenna becomes more and more limited. For example, for a tablet terminal device, the space left for the antenna is only the narrow region between the screen and the frame, and the width of the region is usually not more than 10mm. Therefore, for 5G terminal application, it has good theoretical and application value to design an ultra-low profile antenna which is very small in one dimension and can cover the N78 / N79 dual-band.

[0003] Among many antennas, the microstrip antenna is widely used in the fields of mobile communication, microwave remote sensing and the like due to its excellent performance such as light weight, low profile, easy integration, low cost and simple structure, and has achieved remarkable results. Compared with the traditional microstrip patch antenna, the short-circuit patch antenna has a more compact structure, but usually has the disadvantage of narrow impedance bandwidth.

[0004] The existing traditional dual-band microstrip patch antenna technology usually has a square or rectangular structure with a close length-width ratio when realizing dual-band design, and has more or less the following limitations: a too large planar size (≥0.5x0.5λ1 2 ), a relatively high profile height (≥0.02λ1), a narrow bandwidth (≦5%) and the like.

[0005] The microwave dual-band antenna proposed at present is mainly divided into two categories and has limitations: the first category is to realize dual-band coverage by exciting double / multiple working modes in a single resonator, but due to the difficulty in exciting three or more modes and simultaneously realizing flexible regulation and control of the modes, the antenna bandwidth is usually too narrow to realize full coverage of the frequency band; the second category is to realize dual-band coverage by using a multi-resonator structure to provide multiple resonance modes, but this kind of design is generally square or rectangular with a close length-width ratio, and is not suitable for antenna arrangement in the narrow region inside the 5G terminal. SUMMARY

[0006] The present application proposes an elongated 5G dual-band short-circuit patch antenna for terminal application in view of the deficiencies in the prior art.

[0007] In order to achieve the above-mentioned purposes, the technical solutions adopted by the present application are as follows.

[0008] The application discloses a terminal application-oriented elongated 5G dual-band short-circuit patch antenna, which comprises an upper surface rectangular metal main patch, a substrate and a metal ground arranged in a top-down manner; a first rectangular metal parasitic patch is arranged on the left side of the upper surface rectangular metal main patch, and a second rectangular metal parasitic patch is arranged on the right side of the upper surface rectangular metal main patch; the width of the first rectangular metal parasitic patch along the X-axis direction is greater than the width of the second rectangular metal parasitic patch along the X-axis direction; the length of the first rectangular metal parasitic patch along the Y-axis direction is greater than the length of the second rectangular metal parasitic patch along the Y-axis direction; a plurality of grounding through holes are arranged in an array at one end of the upper surface rectangular metal main patch, the first rectangular metal parasitic patch and the second rectangular metal parasitic patch along the Y-axis direction; the antenna is further provided with a coaxial feeding structure; a vertical first slit is formed on the upper surface rectangular metal main patch along the X-axis direction; one end of the first slit is open, and the other end of the first slit close to the grounding through hole is closed; a second slit symmetrical to the first slit with the first slit as the vertical center is formed on the upper surface rectangular metal main patch along the Y-axis direction on both sides of the first slit; a third slit is horizontally formed on the first rectangular metal parasitic patch along the Y-axis direction; a fourth slit is horizontally formed on the second rectangular metal parasitic patch along the Y-axis direction; one side of the fourth slit is open.

[0009] Further, as a preferred technical solution of the present application, the first slit is used for adjusting the resonant frequency of the TM 0.5,1 mode and the TM 0.5,3 mode of the upper surface rectangular metal main patch.

[0010] Further, as a preferred technical solution of the present application, the second slit is used for adjusting the resonant frequency of the TM 0.5,0 mode and the TM 0.5,2 mode of the upper surface rectangular metal main patch.

[0011] Further, as a preferred technical solution of the present application, the third slit is used for adjusting the resonant frequency of the parasitic TM 0.5,0 mode of the first rectangular metal parasitic patch.

[0012] Further, as a preferred technical solution of the present application, the fourth slit is used for adjusting the resonant frequency of the parasitic TM 0.5,0 mode of the second rectangular metal parasitic patch.

[0013] Further, as a preferred technical solution of the present application, the coaxial feeding structure penetrates the substrate and extends downward to the metal ground.

[0014] The application discloses an elongated 5G dual-band short-circuit patch antenna for terminal application.

[0015] (1) The application provides a 5G dual-band dual-wideband antenna design with an elongated shape, a small planar size and an ultra-low profile.

[0016] (2) The application adopts a short-circuit patch antenna and has the advantages of an ultra-low profile height, and the overall height of the antenna is only 1mm (about 0.012lambda1@3.5GHz); the structure is compact, and only a small unit planar size is needed to realize the application, and the unit planar size is 0.74lambda1*0.12lambda1 (about lambda1@3.5GHz). BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is a schematic diagram of the antenna three-dimensional structure of the embodiment of the application;

[0018] Figure 2 is a top view and a side view of the antenna of the embodiment of the application;

[0019] Figure 3 is a schematic diagram of the |S 11 and gain simulation results of the antenna unit of the embodiment of the application;

[0020] Figure 4 is a simulation directional diagram of the antenna unit of the embodiment of the application at 3.5GHz;

[0021] Figure 5 is a simulation directional diagram of the antenna unit of the embodiment of the application at 4.9GHz;

[0022] In the drawings, 1 is an upper surface rectangular metal main patch; 2 is a substrate; 3 is a metal ground; 4 is a first rectangular metal parasitic patch; 5 is a second rectangular metal parasitic patch; 6 is a grounding via; and 7 is a coaxial feeding structure. DETAILED DESCRIPTION

[0023] The application will be further explained in detail below with reference to the drawings, so that those skilled in the art can have a deeper understanding of the application and can implement the application, but the following examples are only used to explain the application and do not limit the application.

[0024] As Figures 1-2As shown, an elongated 5G dual-band shorted patch antenna for terminal application includes an upper surface rectangular metal main patch 1, a substrate 2 and a metal ground 3 arranged from top to bottom; a first rectangular metal parasitic patch 4 is arranged on the left side of the upper surface rectangular metal main patch 1, and a second rectangular metal parasitic patch 5 is arranged on the right side of the upper surface rectangular metal main patch 1; the width of the first rectangular metal parasitic patch 4 along the X-axis direction is greater than the width of the second rectangular metal parasitic patch 5 along the X-axis direction; the length of the first rectangular metal parasitic patch 4 along the Y-axis direction is greater than the length of the second rectangular metal parasitic patch 5 along the Y-axis direction; a plurality of ground vias 6 are arranged on one end of the upper surface rectangular metal main patch 1, the first rectangular metal parasitic patch 4 and the second rectangular metal parasitic patch 5 along the Y-axis direction; the antenna further comprises a coaxial feeding structure 7; the upper surface rectangular metal main patch 1 is engraved with a vertical first slit along the X-axis direction; one end of the first slit is open, and the other end close to the ground via 6 is closed; the upper surface rectangular metal main patch 1 is engraved with a second slit which is vertically symmetrical to the first slit on both sides of the first slit along the Y-axis direction; the first rectangular metal parasitic patch 4 is horizontally engraved with a third slit along the Y-axis direction; the second rectangular metal parasitic patch 5 is horizontally engraved with a fourth slit along the Y-axis direction; one side of the fourth slit is open.

[0025] The present application can excite the fundamental mode (TM 0.5,0 mode) of the upper surface rectangular metal main patch 1 and three high-order modes (TM 0.5,1 mode, TM 0.5,2 mode and TM 0.5,3 mode) of the elongated shorted patch antenna by probe excitation. The first rectangular metal parasitic patch 4 and the second rectangular metal parasitic patch 5 on both sides of the upper surface rectangular metal main patch 1 are excited by electric coupling. The short circuit vias 6 at the top edges of the upper surface rectangular metal main patch 1, the first rectangular metal parasitic patch 4 and the second rectangular metal parasitic patch 5 are used to short the three patches to the ground plane. The first slit is used to adjust the resonant frequency of the TM 0.5,1 mode and the TM 0.5,3 mode of the upper surface rectangular metal main patch 1. The second slit is used to adjust the resonant frequency of the TM 0.5,0 mode and the TM 0.5,2 mode of the upper surface rectangular metal main patch 1. The third slit is used to adjust the resonant frequency of the parasitic TM 0.5,0 mode of the first rectangular metal parasitic patch 4. The fourth slit is used to adjust the resonant frequency of the parasitic TM 0.5,0 mode of the second rectangular metal parasitic patch 5.

[0026] Thus, flexible tuning of six mode frequencies is achieved. The antenna can generate six modes in the target frequency band, which are TM 0.5,0 mode (3.44GHz), TM 0.5,1The parasitic TM of the mode (3.52GHz) and the first rectangular metal parasitic patch 4 on the left. 0.5,0 TM mode (3.59GHz) and N79 band 0.5,2 Mode (4.82GHz), Parasitic TM of the second rectangular metal parasitic patch 5 on the right. 0.5,0 Mode (4.9GHz) and TM 0.5,3 The mode (4.97GHz) enables 5G dual-band operation.

[0027] This invention utilizes the fundamental mode, higher-order modes, and two parasitic modes of a slender short-circuit patch antenna to achieve dual-band operation. Three resonant points can be configured in the first target frequency band, and three resonant points can also be configured in the second frequency band, achieving dual-band, dual-broadband coverage in the 3.4GHz-3.6GHz and 4.8GHz-5.0GHz frequency bands, which are prioritized for 5G deployment by the state. This invention proposes an ultra-low profile slender short-circuit patch antenna, using a coaxial probe to excite the first four modes of the main patch, namely TM... 0.5,0 ,TM 0.5,1 ,TM 0.5,2 ,TM 0.5,3 The antenna employs a first slot and a pair of second slots orthogonal to the first slot on the upper rectangular metal main patch 1, enabling flexible tuning of four mode frequencies. A third slot is etched on the first rectangular metal parasitic patch 4, and a fourth slot is etched on the second rectangular metal parasitic patch 5, to individually control two parasitic modes. The antenna is capable of achieving dual-band, dual-broadband coverage.

[0028] This invention employs a short-circuit patch antenna, which has the advantage of ultra-low profile height, with an overall antenna height of only 1mm (~0.012λ1@3.5GHz); the structure is compact and can be achieved with only a small unit planar size, which is 0.74λ1×0.12λ1 (~λ1@3.5GHz).

[0029] This antenna can simultaneously include two frequency bands: N78 (3.4GHz-3.6GHz) and N79 (4.8GHz-5.0GHz), but is not limited to the 3.4GHz-3.6GHz and 4.8GHz-5.0GHz frequency bands. This invention can be applied to other 5G frequency bands.

[0030] This invention is a short-circuit patch antenna. The simulation software used is HFSS. The substrate 2 in this invention uses a low dielectric constant substrate with a dielectric constant of 4.5 and a loss angle of 0.0035. The overall cross-sectional height is 0.012λ1 (~λ1@3.5GHz) and the planar dimensions are 0.74λ1×0.12λ1 (~λ1@3.5GHz).

[0031] The transmission response of the antenna unit is shown as Figure 3 11 |≤-6dB as the standard, the impedance bandwidth ranges from 3.4-3.6GHz (relative bandwidth is 5.7%) and 4.8-5GHz (relative bandwidth is 4.08%), which shows that the N78 (3.4GHz-3.6GHz) and N79 (4.8GHz-5.0GHz) bands are well covered, and the wide frequency coverage of the 5G dual-band is realized.

[0032] Figures 4-5 is the simulation pattern of the present antenna unit. Wherein Figure 4 is the simulation pattern at 3.5GHz, Figure 5 is the simulation pattern at 4.9GHz. Figure 4 is the simulation pattern of the present antenna unit at 3.5GHz, the present antenna unit realizes a gain of 3.2dBi at 3.5GHz, and an antenna efficiency of 50.1%. Figure 5 is the simulation pattern of the present antenna unit at 4.9GHz, the present antenna unit realizes a gain of 5.02dBi at 4.9GHz, and an antenna efficiency of 57.9%.

[0033] The above-described specific embodiments further detail the purposes, technical solutions and beneficial effects of the present application, and it should be understood that the above-described specific embodiments are merely specific embodiments of the present application, and are not intended to limit the scope of the present application, and any equivalent changes and modifications made by those skilled in the art without departing from the concept and principles of the present application shall fall within the scope of the present application.​

Claims

1. A terminal application-oriented elongated 5G dual-band short-circuit patch antenna, comprising an upper surface rectangular metal main patch (1), a substrate (2) and a metal ground (3) stacked from top to bottom; characterized in that, The left side of the upper surface rectangular metal main patch (1) is provided with a first rectangular metal parasitic patch (4), and the right side is provided with a second rectangular metal parasitic patch (5); the width of the first rectangular metal parasitic patch (4) along the X-axis direction is greater than the width of the second rectangular metal parasitic patch (5) along the X-axis direction; the length of the first rectangular metal parasitic patch (4) along the Y-axis direction is greater than the length of the second rectangular metal parasitic patch (5) along the Y-axis direction; the upper surface rectangular metal main patch (1), the first rectangular metal parasitic patch (4) and the second rectangular metal parasitic patch (5) are all arrayed with a plurality of grounding through holes (6) at one end along the Y-axis direction; the antenna is also provided with a coaxial feeding structure (7); the upper surface rectangular metal main patch (1) is engraved with a vertical first slit along the X-axis direction; one end of the first slit is open, and the other end close to the grounding through hole (6) is closed; the upper surface rectangular metal main patch (1) is engraved with a second slit symmetrical to the first slit as the vertical center on both sides of the first slit along the Y-axis direction; the first rectangular metal parasitic patch (4) is horizontally engraved with a third slit along the Y-axis direction; the second rectangular metal parasitic patch (5) is horizontally engraved with a fourth slit along the Y-axis direction; one side of the fourth slit is open; The first slit is used to regulate the TM mode of the upper surface rectangular metal main patch (1) 0.5,1 mode and TM 0.5,3 mode resonance frequency; The second slit is used to regulate the TM mode of the upper surface rectangular metal main patch (1) 0.5,0 mode and TM 0.5,2 mode resonance frequency; The third gap is used to regulate the resonant frequency of the parasitic TM mode of the first rectangular metal parasitic patch (4). 0.5,0 mode. The fourth gap is used to regulate the resonant frequency of the parasitic TM mode of the second rectangular metal parasitic patch (5). 0.5,0 mode. The coaxial feeding structure (7) penetrates the substrate (2) and extends downward to the metal ground (3).

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