A dual-frequency omnidirectional antenna and terminal with large frequency ratio

Abstract

The present invention relates to the field of wireless communication and antenna design technology, and discloses a dual-frequency omnidirectional antenna and terminal with a large frequency ratio. The dual-frequency omnidirectional antenna includes: a concave conductive plate, a hollow dielectric column, a short-circuit ring assembly, a monopole, and a cable; the concave conductive plate has a concave accommodation space, and the hollow dielectric column is coaxially placed in the accommodation space; the short-circuit ring assembly includes a conductive ring formed on the upper surface of the hollow dielectric column and four curved short-circuit strips evenly and spaced apart on the outer wall of the hollow dielectric column, and each curved short-circuit strip is electrically connected to a patch at a corner near its lower side; the monopole is coaxially arranged in a hollow cavity of the hollow dielectric column; the cable is coaxial with the hollow dielectric column, and the inner conductor and outer conductor of the cable are respectively connected to the bottom surface of the monopole and the concave conductive plate, and the short-circuit ring assembly and the monopole form omnidirectional radiation at the first resonant frequency and the second resonant frequency respectively. The present invention has the advantages of small size, large frequency ratio, and conformality.

Description

Technical Field

[0001] The present invention belongs to the technical field of wireless communication and antenna design, and in particular relates to a dual-frequency omnidirectional antenna and a terminal with a large frequency ratio. Background Art

[0002] Compared to directional antennas, omnidirectional antennas offer a wide signal coverage range and are well-suited for indoor communication environments. The trend toward smaller communication terminals is a growing trend in wireless communication systems, driving increasing market demand for compact dual-band antennas. Conformal antennas are widely used in communication systems due to their stable performance, adaptability, and strong anti-interference capabilities. Dual-band omnidirectional antennas are typically implemented by adding parasitic elements to low-frequency omnidirectional antennas. The size of these dual-band omnidirectional antennas is directly related to that of the low-frequency antenna, typically measuring a quarter of the wavelength of the low frequency, resulting in a relatively large volume. Furthermore, existing dual-band omnidirectional antennas face design challenges in achieving a large frequency ratio while maintaining a small size, and are difficult to conform to, failing to meet the requirements of today's wireless communication systems. Summary of the Invention

[0003] The present invention aims to provide a dual-band omnidirectional antenna and terminal with a high frequency ratio. The antenna comprises a shorting ring assembly capable of forming an omnidirectional radiation pattern at a first resonant frequency, and a monopole capable of forming an omnidirectional radiation pattern at a second resonant frequency. The antenna achieves high-frequency-ratio dual-band omnidirectional radiation in a compact form factor, facilitating its application in wireless systems.

[0004] In order to achieve the above object, the present invention provides the following technical solutions:

[0005] In a first aspect, the present invention provides a dual-band omnidirectional antenna with a large frequency ratio, comprising: a concave conductive plate, a hollow dielectric column, a shorting ring assembly, a monopole, and a cable;

[0006] The concave conductive plate has a concave accommodating space, and the hollow dielectric column is coaxially placed in the accommodating space; the short-circuit ring assembly includes a conductive ring formed on the upper surface of the hollow dielectric column, and four curved short-circuit strips formed on the outer wall of the hollow dielectric column, the upper end of each curved short-circuit strip is connected to the conductive ring, and the lower end is connected to the bottom surface of the concave conductive plate, the four curved short-circuit strips are evenly and spaced apart along the circumference of the outer wall of the hollow dielectric column, and each curved short-circuit strip is electrically connected to a patch at a corner near its lower side; the monopole is coaxially arranged in the hollow cavity of the hollow dielectric column; the cable is coaxial with the hollow dielectric column, and the inner conductor of the cable is connected to the monopole, and the outer conductor of the cable is connected to the bottom surface of the concave conductive plate;

[0007] The short-circuit ring assembly can form an omnidirectional radiation mode at a first resonant frequency; the monopole can form an omnidirectional radiation mode at a second resonant frequency, and the height of the monopole is a quarter wavelength at the second resonant frequency; the first resonant frequency is lower than the second resonant frequency.

[0008] As a possible implementation, the extended length L of the curved short-circuit strip is determined as follows:

[0009]

[0010] Wherein, L is the extended length of the curved short-circuit strip, in mm; f1 is the first resonant frequency, in GHz; C is the circumference of the conductive ring, in mm.

[0011] As a possible implementation method, the four curved short-circuit strips all extend from the outer edge of the conductive ring to the bottom surface of the concave conductive plate and have the same shape; the shape is at least one of a straight right angle, a straight non-right angle, a combination of a straight right angle and a non-right angle, and a curved shape.

[0012] As a possible implementation method, the curved short-circuit strip is a straight right-angled strip, and from the outer edge of the conductive ring to the bottom surface of the concave conductive plate, it includes a vertical first straight line segment L11 connected end to end, a right-folded horizontal second straight line segment L12, a vertical third straight line segment L13, a left-folded horizontal fourth straight line segment L14, a vertical fifth straight line segment L15, a right-folded horizontal sixth straight line segment L16, a vertical seventh straight line segment L17, a left-folded horizontal eighth straight line segment L18 and a vertical ninth straight line segment L19; the patch is arranged at the intersection of L17 and L18.

[0013] As a possible implementation, define the width of the curved short-circuit strip as W11, the patch as a square patch, the length of the square patch as L20, and the width as W20; in this case:

[0014] L11=5.5mm, L12=5.3mm, L13=5.5mm, L14=16.8mm, L15=4mm, L16=21.9mm, L17=5mm, L18=16.8mm, L19=10mm, W11=0.9mm;

[0015] L20=8mm, W20=9.6mm.

[0016] As a possible implementation, the conductive ring, curved short-circuit strip and patch included in the short-circuit ring assembly are made of the same material, which is one of copper, aluminum, tungsten, titanium, tantalum, molybdenum or platinum.

[0017] As a possible implementation manner, the heights of the monopole and the hollow dielectric column are equal and less than or equal to the depth of the accommodation space of the concave conductive plate.

[0018] As a possible implementation manner, the concave conductive plate is a bowl-shaped structure, specifically including an outwardly extending bowl rim, a concave bowl wall, and a planar bowl bottom.

[0019] As a possible implementation, the first resonant frequency is 0.4 to 0.401 GHz, at which point the gain of the dual-band omnidirectional antenna is 0.37 dBic;

[0020] The second resonant frequency is 2.3-2.94 GHz. At this time, the gain of the dual-band omnidirectional antenna is 7.05 dBic.

[0021] In a second aspect, the present invention provides a terminal, using the dual-frequency omnidirectional antenna with a large frequency ratio provided in the first aspect.

[0022] Compared with the prior art, the present invention has the following effects:

[0023] 1. The dual-band omnidirectional antenna with a large frequency ratio provided by the present invention adopts a monopole to provide a high-frequency resonance point and a short-circuit ring assembly to provide a low-frequency resonance point, realizing dual operating frequency bands on the same antenna and having the advantage of a small size. The curved short-circuit strip in the short-circuit ring assembly adopts a curved structure design, and the resonant frequency of the low-frequency band can be adjusted by adjusting its extended length. The lower the frequency, the larger the frequency ratio, which breaks through the technical difficulty of achieving a large frequency ratio in a small size for a dual-band omnidirectional antenna.

[0024] 2. The dual-band omnidirectional antenna with a large frequency ratio provided by the present invention has a coaxial accommodation space provided by the monopole, the hollow dielectric column and the concave conductive plate, and the height is less than or equal to the depth of the accommodation space. At the same time, the concave conductive plate adopts a bowl-shaped structure, thereby realizing the conformal design of the dual-band omnidirectional antenna.

[0025] 3. The dual-band omnidirectional antenna with a large frequency ratio provided by the present invention has a curved short-circuit strip with a curved structure design, which greatly reduces the height of the antenna and reduces the volume of the antenna, which is conducive to the miniaturization design of the dual-band omnidirectional antenna. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The drawings described herein are used to provide further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0027] Figure 1 A schematic structural diagram of a dual-frequency omnidirectional antenna with a large frequency ratio provided by an embodiment of the present invention;

[0028] Figure 2 A schematic structural diagram of a short-circuit ring assembly of a dual-band omnidirectional antenna with a large frequency ratio provided by an embodiment of the present invention;

[0029] Figure 3 A schematic diagram of the monopole structure of a dual-frequency omnidirectional antenna with a large frequency ratio provided by an embodiment of the present invention;

[0030] Figure 4 A schematic diagram of the curved short-circuit strip shape of a dual-band omnidirectional antenna with a large frequency ratio provided by an embodiment of the present invention;

[0031] Figure 5 The curved short-circuit strip and patch size of the dual-band omnidirectional antenna with a large frequency ratio provided by the embodiment of the present invention;

[0032] Figure 6 A schematic diagram of the structure of a concave conductive plate of a dual-band omnidirectional antenna with a large frequency ratio provided by an embodiment of the present invention;

[0033] Figure 7 The dimensions of the dual-band omnidirectional antenna with a large frequency ratio provided by an embodiment of the present invention;

[0034] Figure 8 A reflection coefficient curve diagram of a dual-band omnidirectional antenna with a large frequency ratio provided by an embodiment of the present invention;

[0035] Figure 9 A gain curve diagram of a dual-band omnidirectional antenna with a large frequency ratio provided by an embodiment of the present invention;

[0036] Figure 10 The radiation pattern of the dual-band omnidirectional antenna with a large frequency ratio at 0.4 GHz provided by an embodiment of the present invention;

[0037] Figure 11 The radiation pattern of the 2.5 GHz dual-band omnidirectional antenna with a large frequency ratio provided by an embodiment of the present invention.

[0038] Reference numerals

[0039] 10-concave conductive plate, 101-bowl edge, 102-bowl wall, 103-bowl bottom, 20-hollow dielectric column, 30-short-circuit ring assembly, 301-conductive ring, 302-curved short-circuit strip, 303-patch, 40-monopole, 50-cable, 501-inner conductor, 502-outer conductor. DETAILED DESCRIPTION

[0040] To facilitate a clear description of the technical solutions of the embodiments of the present invention, the words "first" and "second" are used in the embodiments of the present invention to distinguish between identical or similar items with substantially the same functions and effects. For example, the first threshold and the second threshold are merely used to distinguish between different thresholds and do not limit their order. Those skilled in the art will understand that the words "first" and "second" do not limit the quantity or execution order, and the words "first" and "second" do not necessarily mean that they are different.

[0041] It should be noted that, in the present invention, words such as "exemplary" or "for example" are used to indicate examples, illustrations, or descriptions. Any embodiment or design described as "exemplary" or "for example" in the present invention should not be construed as being preferred or advantageous over other embodiments or designs. Rather, the use of words such as "exemplary" or "for example" is intended to present the relevant concepts in a concrete manner.

[0042] In the present invention, "at least one" refers to one or more, and "more" refers to two or more. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent: the existence of A alone, the existence of A and B at the same time, and the existence of B alone, where A and B can be singular or plural. The character " / " generally indicates that the previous and next associated objects are in an "or" relationship. "At least one of the following items" or similar expressions refers to any combination of these items, including any combination of single items or plural items. For example, at least one of a, b or c can represent: a, b, c, the combination of a and b, the combination of a and c, the combination of b and c, or the combination of a, b and c, where a, b, c can be single or multiple.

[0043] Existing dual-band omnidirectional antennas are typically built on low-frequency omnidirectional antennas by adding parasitic elements. These antennas are typically a quarter of the wavelength of the low-frequency antenna, making them bulky. Furthermore, these antennas face design challenges in achieving a high frequency ratio while maintaining a compact size and are difficult to conform to, making them incapable of meeting the requirements of today's wireless communication systems.

[0044] To address the above issues, the present invention provides a dual-band omnidirectional antenna with a high frequency ratio. The antenna comprises a shorting ring assembly capable of generating an omnidirectional radiation pattern at a first resonant frequency, and a monopole capable of generating an omnidirectional radiation pattern at a second resonant frequency. This antenna achieves high-frequency-ratio dual-band omnidirectional radiation in a compact package, facilitating its application in wireless systems.

[0045] In a first aspect, the present invention provides a dual-frequency omnidirectional antenna with a large frequency ratio, see Figure 1 , comprising: a concave conductive plate 10, a hollow dielectric column 20, a short-circuit ring assembly 30, a monopole 40 and a cable 50;

[0046] See also Figures 1 to 2The concave conductive plate 10 has a concave accommodating space, and the hollow dielectric column 20 is coaxially placed in the accommodating space; the short-circuit ring assembly 30 includes a conductive ring 301 formed on the upper surface of the hollow dielectric column 20, and four curved short-circuit strips 302 formed on the outer wall of the hollow dielectric column 20. The upper end of each curved short-circuit strip 302 is connected to the conductive ring 301, and the lower end is connected to the bottom surface of the concave conductive plate 10. The four curved short-circuit strips 302 are evenly and spaced apart along the circumference of the outer wall of the hollow dielectric column 20. Each curved short-circuit strip 302 is electrically connected to a patch 303 at a corner near its lower side.

[0047] The conductive ring is arranged on the upper surface of the hollow dielectric column, and four curved short-circuit strips are evenly and spaced apart on the outer wall of the hollow dielectric column. The curved short-circuit strips adopt a curved structure, which is more conducive to the miniaturization design of the antenna.

[0048] See also Figure 1 and Figure 3 The monopole 40 is coaxially arranged in the hollow cavity of the hollow dielectric column 20; the cable 50 is coaxial with the hollow dielectric column 20, and the inner conductor 501 of the cable 50 is connected to the monopole 40, and the outer conductor 502 of the cable 50 is connected to the bottom surface of the concave conductive plate 10;

[0049] As an example, the monopole is any one of an inverted conical monopole, an inverted hexagonal pyramid monopole, and an inverted tapered conical monopole.

[0050] As an example, the hollow dielectric column uses 5880 material with a dielectric constant of 2.2 and a loss tangent value of 0.02.

[0051] The shorting ring assembly is capable of forming an omnidirectional radiation pattern at a first resonant frequency; the monopole is capable of forming an omnidirectional radiation pattern at a second resonant frequency, and the height of the monopole is one-quarter wavelength at the second resonant frequency; the first resonant frequency is lower than the second resonant frequency. In the present invention, the second resonant frequency can be adjusted by adjusting the size of the monopole.

[0052] The dual-band omnidirectional antenna provided by this invention uses a monopole to provide a high-frequency resonance point and a short-circuit ring assembly to provide a low-frequency resonance point. This allows a single antenna to achieve dual frequencies, whereas existing technologies typically use a stacked low-frequency and high-frequency antennas. Compared to existing technologies, this invention can achieve a higher frequency ratio while reducing the size.

[0053] As a possible implementation, the extended length L of the curved short-circuit strip is determined as follows:

[0054]

[0055] Wherein, L is the extended length of the curved short-circuit strip, in mm; f1 is the first resonant frequency, in GHz; C is the circumference of the conductive ring, in mm.

[0056] It can be seen that there is a linear relationship between the extended length of the curved short-circuit strip and the first resonant frequency. Therefore, the first resonant frequency can be adjusted by adjusting the size of the curved short-circuit strip.

[0057] See also Figure 2 As a possible implementation, the four curved short-circuit strips 302 all extend from the outer edge of the conductive ring 301 to the bottom surface of the concave conductive plate 10 and have the same shape; see Figure 4 The shape of the curved short-circuit strip is at least one of a straight right-angle shape, a straight non-right-angle shape, a combination of a straight right-angle shape and a non-right-angle shape, and a curved shape.

[0058] As an example, the curved short-circuit strip may be formed by screen printing, etching, 3D printing, or a semiconductor metallization process.

[0059] See also Figure 5 As a possible implementation method, the curved short-circuit strip 302 is a straight right-angled strip, and includes, from the outer edge of the conductive ring to the bottom surface of the concave conductive plate, a vertical first straight segment L11, a right-bend horizontal second straight segment L12, a vertical third straight segment L13, a left-bend horizontal fourth straight segment L14, a vertical fifth straight segment L15, a right-bend horizontal sixth straight segment L16, a vertical seventh straight segment L17, a left-bend horizontal eighth straight segment L18, and a vertical ninth straight segment L19, which are connected end to end; the patch is arranged at the intersection of L17 and L18.

[0060] See also Figure 5 As a possible implementation, define the width of the curved short-circuit strip as W11, the patch as a square patch, the length of the square patch as L20, and the width as W20; in this case:

[0061] L11=5.5mm, L12=5.3mm, L13=5.5mm, L14=16.8mm, L15=4mm, L16=21.9mm, L17=5mm, L18=16.8mm, L19=10mm, W11=0.9mm;

[0062] L20=8mm, W20=9.6mm.

[0063] The design of the curved short-circuit strip adopted in the present invention greatly reduces the overall height of the antenna, reduces the volume of the antenna, and has the advantage of miniaturization.

[0064] As a possible implementation, the conductive ring, curved short-circuit strip and patch included in the short-circuit ring assembly are made of the same material, which is one of copper, aluminum, tungsten, titanium, tantalum, molybdenum or platinum.

[0065] See also Figure 1 As a possible implementation, the heights of the monopole 40 and the hollow dielectric column 20 are equal and less than or equal to the depth of the accommodation space of the concave conductive plate 10 .

[0066] See also Figure 6 As a possible implementation, the concave conductive plate 10 is a bowl-shaped structure, specifically including an outwardly extending bowl edge 101, a concave bowl wall 102 and a planar bowl bottom 103.

[0067] In the dual-band omnidirectional antenna provided by the present invention, the monopole, the hollow dielectric column and the accommodating space of the concave conductive plate are coaxial and the height is less than or equal to the depth of the accommodating space. At the same time, the concave conductive plate adopts a bowl-shaped structure, realizing the conformal design of the dual-band omnidirectional antenna.

[0068] See also Figure 7 As an example, the height H of the hollow dielectric column is 30 mm; the bottom radius R1 of the monopole is 12.1 mm; the inner diameter R2 and outer diameter R3 of the conductive ring are 36.5 mm and 62.5 mm respectively; the planar bowl bottom radius R4 of the concave conductive plate is 88 mm; the inner diameter R5 of the outwardly extending bowl edge of the concave conductive plate is 150 mm, and the outer diameter R6 is 400 mm.

[0069] As a possible implementation, see Figures 8 and 9 The first resonant frequency is 0.4~0.401GHz, at this time, the gain of the dual-band omnidirectional antenna is 0.37dBic; the second resonant frequency is 2.3~2.94GHz, at this time, the gain of the dual-band omnidirectional antenna is 7.05dBic.

[0070] See also Figures 10 and 11 , which are respectively the radiation patterns of the dual-band omnidirectional antenna with a large frequency ratio provided by the present invention when the first resonant frequency is 0.4 GHz and the second resonant frequency is 2.5 GHz. The frequency band ratio of the second resonant frequency to the first resonant frequency reaches 6.25. Therefore, the present invention can achieve omnidirectional radiation with a large frequency ratio.

[0071] In a second aspect, the present invention provides a terminal, using the dual-frequency omnidirectional antenna with a large frequency ratio provided in the first aspect.

[0072] Although the present invention is described herein in conjunction with various embodiments, in the process of implementing the claimed invention, those skilled in the art can understand and implement other variations of the disclosed embodiments by viewing the drawings, the disclosure, and the drawings, etc. In the specification, the word "comprising" does not exclude other components or steps, and "one" or "an" does not exclude multiple situations. A single processor or other unit can implement several functions listed in the specification. Certain measures are recorded in different embodiments, but this does not mean that these measures cannot be combined to produce good results.

[0073] Although the present invention has been described with reference to specific features and embodiments thereof, it will be apparent that various modifications and combinations thereof may be made without departing from the spirit and scope of the invention. Accordingly, this specification and drawings are merely illustrative of the present invention and are deemed to cover any and all modifications, variations, combinations or equivalents within the scope of the invention. It will be apparent that various modifications and variations of the present invention may be made by those skilled in the art without departing from the spirit and scope of the invention. Thus, the present invention is intended to include such modifications and variations as fall within the scope of the invention and its equivalents.

Claims

1. A dual-band omnidirectional antenna with a large frequency ratio, characterized in that: include: Concave conductive plates, hollow dielectric columns, shorting ring assemblies, monopoles, and cables; The concave conductive plate has a concave accommodating space, and the hollow dielectric column is coaxially placed in the accommodating space; the short-circuit ring assembly includes a conductive ring formed on the upper surface of the hollow dielectric column, and four curved short-circuit strips formed on the outer side wall of the hollow dielectric column, the upper end of each curved short-circuit strip is connected to the conductive ring, and the lower end is connected to the bottom surface of the concave conductive plate, the four curved short-circuit strips are evenly and spaced apart along the circumference of the outer side wall of the hollow dielectric column, and each curved short-circuit strip is electrically connected to a patch at a corner near its lower side; the monopole is coaxially arranged in the hollow cavity of the hollow dielectric column; the cable is coaxial with the hollow dielectric column, and the inner conductor of the cable is connected to the monopole, and the outer conductor of the cable is connected to the bottom surface of the concave conductive plate; The short-circuit ring assembly can form an omnidirectional radiation pattern at a first resonant frequency; the monopole can form an omnidirectional radiation pattern at a second resonant frequency, and the height of the monopole is one-quarter of the wavelength at the second resonant frequency; the first resonant frequency is lower than the second resonant frequency.

2. The dual-frequency omnidirectional antenna with a large frequency ratio according to claim 1, characterized in that: The extended length L of the curved short-circuit strip is determined as follows: Wherein, L is the extended length of the curved short-circuit strip, in mm; f1 is the first resonant frequency, in GHz; C is the circumference of the conductive ring, in mm.

3. The dual-frequency omnidirectional antenna with a large frequency ratio according to claim 1, characterized in that: The four curved short-circuit strips all extend from the outer edge of the conductive ring to the bottom surface of the concave conductive plate and have the same shape; the shape is at least one of a straight right angle, a straight non-right angle, a combination of a straight right angle and a non-right angle, and a curve.

4. The dual-frequency omnidirectional antenna with a large frequency ratio according to claim 3, characterized in that: The curved short-circuit strip is a straight right-angled strip, and from the outer edge of the conductive ring to the bottom surface of the concave conductive plate, it includes a vertical first straight segment L11, a right-folded horizontal second straight segment L12, a vertical third straight segment L13, a left-folded horizontal fourth straight segment L14, a vertical fifth straight segment L15, a right-folded horizontal sixth straight segment L16, a vertical seventh straight segment L17, a left-folded horizontal eighth straight segment L18 and a vertical ninth straight segment L19, which are connected end to end; the patch is arranged at the intersection of L17 and L18.

5. The dual-frequency omnidirectional antenna with a large frequency ratio according to claim 4, characterized in that: The width of the curved short-circuit strip is defined as W11, and the patch is a square patch with a length of L20 and a width of W20. In this case: L11=5.5mm, L12=5.3mm, L13=5.5mm, L14=16.8mm, L15=4mm, L16=21.9mm, L17=5mm, L18=16.8mm, L19=10mm, W11=0.9mm; L20=8mm, W20=9.6mm.

6. The dual-frequency omnidirectional antenna with a large frequency ratio according to claim 1, characterized in that: The conductive ring, the curved short-circuit strip and the patch included in the short-circuit ring assembly are made of the same material, which is one of copper, aluminum, tungsten, titanium, tantalum, molybdenum or platinum.

7. The dual-frequency omnidirectional antenna with a large frequency ratio according to claim 1, characterized in that: The heights of the monopole and the hollow dielectric column are equal and less than or equal to the depth of the accommodation space of the concave conductive plate.

8. The dual-frequency omnidirectional antenna with a large frequency ratio according to claim 1, characterized in that: The concave conductive plate is a bowl-shaped structure, specifically comprising an outwardly extending bowl edge, a concave bowl wall, and a planar bowl bottom.

9. The dual-frequency omnidirectional antenna with a large frequency ratio according to claim 1, characterized in that: The first resonant frequency is 0.4 to 0.401 GHz. At this time, the gain of the dual-band omnidirectional antenna is 0.37 dBic. The second resonant frequency is 2.3-2.94 GHz. At this time, the gain of the dual-band omnidirectional antenna is 7.05 dBic.

10. A terminal, characterized in that: A dual-band omnidirectional antenna with a large frequency ratio as claimed in any one of claims 1 to 9.

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