Three-frequency microstrip antenna applied to 5G communication terminal equipment

Abstract

The invention relates to a three-frequency microstrip antenna applied to 5G communication terminal equipment, which belongs to the technical field of antennas and mainly comprises an upper surface radiation unit layer, a lower surface grounding plate layer, an intermediate dielectric substrate layer and a feed structure, the radiation unit layer comprises two internally and externally nested circular patches, symmetrical resonance arms on a circular ring at the outer side of the upper part and an internal and external circular ring connecting patch at the lower part, a circular ring is formed on the two internally and externally nested circular patches of the radiation unit, the circular ring is a circular ring with an opening at the lower end, a rectangular block is connected between the two end parts of the circular ring, and the rectangular block is connected with the circular ring. And all structures of the antenna are conducted. The antenna is simple in structure, the overall area is only 23 mm * 29 mm * 1 mm, the antenna has good radiation characteristics, the stability of a multi-band radiation pattern is kept, the structure is simple, the profile is low, and the antenna has great potential in terminal equipment.

Description

Technical Field

[0001] The present invention belongs to the field of antenna technology, and in particular relates to a triple-band microstrip antenna applied to 5G communication terminal equipment. Background Art

[0002] With the rapid development of 5G communication technology, the demand for multi-band low-profile antennas is growing. Compared with the previous generation of communication technology, 5G technology has higher requirements for antenna design due to its high data rate throughput, low latency and large number of connections. Traditional antenna design often faces problems such as large size, low efficiency and high cost when facing the high frequency band and broadband characteristics of 5G. In addition, as mobile devices develop towards miniaturization and integration, the miniaturization and integration of antennas have also become the key to design. Summary of the invention

[0003] In response to the problems in the background technology, the present invention aims to develop a multi-band low-profile antenna suitable for 5G communication terminal equipment. Since they have little impact on the overall thickness of the equipment, low-profile antennas can better adapt to the design concept of modern mobile devices, thereby meeting the market's dual demands for portability and aesthetics.

[0004] To achieve the above object, the present invention adopts the following technical solution: A triple-band microstrip antenna for 5G communication terminal equipment is mainly composed of an upper surface radiation unit layer, a lower surface ground plate layer, an intermediate dielectric substrate layer and a feeding structure. The radiation unit layer includes two circular patches nested inside and outside, a symmetrical resonant arm on the upper outer circular ring, and inner and outer circular connecting patches on the lower part. The radiation unit is connected to the feeding structure, and all structures are symmetrical relative to the feeding structure. A circular ring is opened on the two circular patches nested inside and outside the radiation unit, and the circular ring is an open circular ring at the lower end. A rectangular block is connected between the two ends of the circular ring, so that all structures of the antenna are conductive.

[0005] Preferably, the radiation unit, the ground plate and the feeding structure are all made of copper material with a thickness of 0.035 mm.

[0006] Preferably, the width of the dielectric plate is 23mm; the length of the dielectric plate is 29mm; the length of the microstrip line is 17mm; the width of the microstrip line is 3mm; the width of the upper inner and outer ring connecting patches is 5.4mm; the height of the ground plate is 6mm; the length of the symmetrical resonant arm on the outer ring is 8mm, and the width of the symmetrical resonant arm on the outer ring is 2.5mm; the inner radius of the inner ring is 1mm, and the outer radius of the inner ring is 4mm; the inner radius of the outer ring is 5mm, and the outer radius of the outer ring is 9mm.

[0007] Preferably, the outer diameter of the open ring is 7.8 mm and the inner diameter is 7.2 mm.

[0008] Compared with the prior art, the present invention has the following beneficial effects: The present invention mainly designs a circular monopole antenna. A symmetrical resonant arm dual-band microstrip antenna is designed by adding a small-sized circular ring structure inside the circular monopole antenna, so that the dual-band effect can be achieved in the parts of 3.15 GHz to 3.86 GHz and 4.75 GHz to 7.12 GHz. Then, a circular ring is added again inside the antenna through folding and slot loading technology, and a symmetrical resonant arm three-band microstrip antenna is designed, so that the three-band effect can be achieved in the parts of 3.1 GHz to 3.7 GHz, 4.35 GHz to 5.83 GHz and 6.33 GHz to 7.61 GHz.

[0009] Experimental results show that the antenna has a simple structure and an overall area of ​​only 23 mm × 29 mm × 1 mm. The dielectric layer material uses an FR4 dielectric board with a relative dielectric constant of 4.4 and a loss tangent of 0.02. The antenna input port impedance is 50 ohm. The return loss in the required working frequency band is less than -10 dB, and the maximum gain is 2.2 dBi. It has good radiation characteristics and maintains the stability of the multi-band radiation pattern. It has a simple structure and a low profile, and has great potential in terminal equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 Schematic diagram of the antenna structure of the present invention.

[0011] Figure 2 This is the initial return loss layout of the antenna of the present invention.

[0012] Figure 3 This is a graph showing the return loss results of the antenna R1 parameter scan of the present invention. DETAILED DESCRIPTION

[0013] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the specific implementation mode, structure, characteristics and effects of the present invention are described in detail below in combination with the accompanying drawings and preferred embodiments.

[0014] like Figure 1 As shown, a tri-band microstrip antenna applied to 5G communication terminal equipment of the present invention is mainly composed of an upper surface radiation unit layer, a lower surface grounding plate layer, an intermediate dielectric substrate layer and a feeding structure. The radiation unit layer includes two circular ring patches nested inside and outside, a symmetrical resonant arm on the upper outer circular ring and an inner and outer circular ring connecting patch at the lower part. The radiation unit is connected to the feeding structure, and all structures are symmetrical relative to the feeding structure. Outside the original inner ring, a circular ring R5 with an outer diameter of R6 and an inner diameter of R6 is opened, and a rectangular block L6 is connected to the upper part of the rectangle shown in L2, so that all structures of the antenna are conductive.

[0015] In the figure, L1 is the width of the FR4 dielectric plate, which is 23mm; W1 is the length of the FR4 dielectric plate, which is 29mm; W2 is the length of the microstrip line, which is 17mm; L3 is the width of the microstrip line, which is 3mm; L2 is the width of the upper inner and outer ring connection patch, which is 5.4mm; W3 is the height of the ground plate, which is 6mm; W4 is the length of the symmetrical resonant arm on the outer ring, which is 8mm; L4 and L5 are the widths of the symmetrical resonant arms on the outer ring, which are 2.5mm; R1 is the inner radius of the inner ring, which is 1mm; R2 is the outer radius of the inner ring, which is 4mm; R3 is the inner radius of the outer ring, which is 5mm; R4 is the outer radius of the outer ring, which is 9mm; R5 is the inner diameter of the ring, which is 7.2mm; R6 is the outer diameter of the ring, which is 7.8mm. The antenna structure dimensions are shown in Table 1 (the data are the results after optimization).

[0016] By jointly optimizing multiple parameters, we finally get Figure 2 The return loss diagram is shown in Table 1. The parameter values ​​at this time are shown in Table 1. Table 1 Final size parameter table of the three-band antenna Depend on Figure 3 It is known that the three-band effect is achieved in the 3.1 GHz to 3.7 GHz, 4.35 GHz to 5.83 GHz and 6.33 GHz to 7.61 GHz parts. The return loss value at the center frequency of each band is lower than -15dB, and the antenna is well matched.

[0017] Smith chart is a commonly used impedance matching tool. Impedance Z and reflection coefficient Γ can be shown on the Smith chart. The corresponding impedance and admittance can also be read out through the Smith chart grid. The center of the circle 1 represents the matching state, the leftmost is the short-circuit state, and the rightmost is the open-circuit state. Check the Smith chart of the triple-band antenna. In the 3.6GHz band marked by Marker1, the antenna's characteristics are capacitive. In the lower half of the Smith chart, Marker1 is the normalized impedance at 3.6GHz, which is 0.9199-0.3908i, that is, 50*(0.9199-0.3908i)ohm. In the 5GHz band marked by Marker2, the antenna's characteristics are inductive. In the upper half of the chart, Marker 2 is the normalized impedance at 5 GHz, which is 0.7729+0.3011i, i.e. 50*(0.7729+0.3011)ohm. In the frequency band of 7 GHz marked by Marker 3, there are both capacitance and inductance. Marker 1 and Marker 2 are close to the dot, and the matching performance of the antenna is good.

[0018] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A triple-band microstrip antenna for 5G communication terminal equipment, mainly composed of an upper surface radiation unit layer, a lower surface ground plate layer, an intermediate dielectric substrate layer and a feeding structure, characterized in that: The radiation unit layer includes two circular patches nested inside and outside, a symmetrical resonant arm on the upper outer circular ring, and an inner and outer circular ring connecting patch on the lower part. The radiation unit is connected to the feeding structure, and all structures are symmetrical relative to the feeding structure. A circular ring is opened on the two circular patches nested inside and outside the radiation unit, and the circular ring is an open circular ring at the lower end. A rectangular block is connected between the two ends of the circular ring, so that all structures of the antenna are conductive.

2. A triple-band microstrip antenna for 5G communication terminal equipment according to claim 1, characterized in that: The radiation unit, ground plate and feeding structure are all made of copper material with a thickness of 0.035 mm.

3. A triple-band microstrip antenna for 5G communication terminal equipment according to claim 2, characterized in that: The width of the dielectric plate is 23mm; the length of the dielectric plate is 29mm; the length of the microstrip line is 17mm; the width of the microstrip line is 3mm; the width of the upper inner and outer ring connecting patches is 5.4mm; the height of the ground plate is 6mm; the length of the symmetrical resonant arm on the outer ring is 8mm, and the width of the symmetrical resonant arm on the outer ring is 2.5mm; the inner radius of the inner ring is 1mm, and the outer radius of the inner ring is 4mm; the inner radius of the outer ring is 5mm, and the outer radius of the outer ring is 9mm.

4. A triple-band microstrip antenna for 5G communication terminal equipment according to claim 3, characterized in that: The outer diameter of the open ring is 7.8 mm, and the inner diameter is 7.2 mm.

Images