A dipole antenna provided with a funnel-shaped gap

Abstract

The application discloses a dipole antenna provided with a funnel-shaped gap, which comprises a metal reflecting plate, a supporting column connected to the upper end surface of the metal reflecting plate, a dielectric plate connected to the upper surface of the supporting column, a rectangular radiation layer arranged on the upper surface of the dielectric plate, a funnel-shaped gap formed in the rectangular radiation layer along the Y-axis direction, the bottom end of the tubular gap of the funnel-shaped gap extending to the edge of the rectangular radiation layer in the X-axis direction, the Y-axis direction being the length direction of the rectangular radiation layer, and the X-axis direction being the width direction of the rectangular radiation layer, and a feeding point arranged in the tubular gap of the funnel-shaped gap and connected to the rectangular radiation layers on both sides of the tubular gap. The dipole antenna provided by the application is simple in structure and convenient to produce, can work in a full-wave mode or a half-wave mode at different resonance points, realizes multiple working modes of the dipole antenna, can form a wideband coverage range of 1.7GHz-3.7GHz when all the resonance points are fused together, and improves the wideband coverage range of the dipole antenna.

Description

A dipole antenna with a funnel-shaped gap Technical Field

[0001] This invention belongs to the field of antenna technology, and specifically relates to a dipole antenna with a funnel-shaped gap. Background Technology

[0002] A dipole antenna consists of a pair of symmetrically placed dipole arms, with the two ends of the dipole arms connected to the inner and outer cores of a radio frequency cable, respectively. The current distribution of the dipole is similar to the current distribution on an open circuit at the end, approximating a sinusoidal standing wave distribution: I(x) = m sin[β(l-|x|,-l≤x≤l, where the center of the dipole antenna is taken as the origin, and the direction from the origin to the end of the dipole arm is defined as the X-axis direction, l represents the length of a single dipole arm, x represents the coordinate variable of the X-axis, that is, the distance between any point on the dipole arm and the origin, β represents the propagation constant, I m Let I(x) represent the maximum current value, and let I(x) represent the current at any point on the dipole arm at position x. When the total length of the dipole is equal to half a wavelength, that is, when the total length is equal to 0.5λ, the maximum current value is near the feed point, and there is only one maximum current value. When the total length of the dipole is equal to one wavelength, that is, when the total length is equal to 1λ, the maximum current value is in the middle of the two arms of the dipole, and there are two maximum current values. Here, λ is the free space wavelength corresponding to the center frequency of the dipole's operating frequency band.

[0003] To meet the bandwidth requirements of modern communication systems, researchers have made many attempts to extend the bandwidth of dipoles. A common method for widening the bandwidth is to widen the ends of the dipole radiating arms to form a bowtie antenna. The maximum bandwidth of broadband antennas formed by this method is approximately 17.3%, and the antenna operates in half-wave mode near the resonant point. For details, see the paper "A 900MHz Shielded Bow-tie Antenna System for Ground Penetrating Radar" published by Chen Guo et al. in "Proceedings of the XIII Internarional Conference on Ground Penetrating Radar" in August 2010. Broadband antennas formed by the above methods all operate in half-wave mode, with their maximum current located between the two radiating arms, and only one maximum current exists. Summary of the Invention

[0004] To address the aforementioned problems in the prior art, the present invention is achieved through the following technical solution:

[0005] This invention provides a dipole antenna with a funnel-shaped gap, comprising:

[0006] Metal reflector;

[0007] A support column is connected to the upper end face of the metal reflector.

[0008] A medium plate is connected to the upper surface of the support column;

[0009] A rectangular radiating layer is disposed on the upper surface of the dielectric substrate. A funnel-shaped slit is formed in the rectangular radiating layer along the Y-axis direction. The bottom end of the tubular slit of the funnel-shaped slit extends to the edge of the rectangular radiating layer in the X-axis direction. The Y-axis direction is the length direction of the rectangular radiating layer, and the X-axis direction is the width direction of the rectangular radiating layer.

[0010] The power supply point is located within the tubular slit in the funnel-shaped slit and connects to the rectangular radiation layer on both sides of the tubular slit.

[0011] In one embodiment of the present invention, the rectangular radiating layer includes:

[0012] On the first side of the funnel-shaped slit, a first rectangular radiator, a first trapezoidal radiator, and a second rectangular radiator are connected sequentially from the bottom end of the tubular slit to the top edge of the funnel opening, wherein the first trapezoidal radiator is a right trapezoid.

[0013] On the second side of the funnel-shaped slit, a third rectangular radiator, a second trapezoidal radiator, and a fourth rectangular radiator are connected sequentially from the bottom end of the tubular slit to the top edge of the funnel opening, wherein the second trapezoidal radiator is a right trapezoid.

[0014] The fifth rectangular radiator is connected to the second long side of the second rectangular radiator and the second long side of the fourth rectangular radiator respectively. The second long side of the second rectangular radiator is the long side of the second rectangular radiator that is away from the first trapezoidal radiator. The second long side of the fourth rectangular radiator is the long side of the fourth rectangular radiator that is away from the second trapezoidal radiator. The first side structure and the second side structure of the funnel-shaped slit are symmetrical.

[0015] In one embodiment of the invention, the power supply point is located at the first end of the tubular slit near the funnel opening, and,

[0016] When the inner core of the feed point is connected to the first rectangular radiator, the outer core of the feed point is connected to the third rectangular radiator;

[0017] When the outer core of the feed point is connected to the first rectangular radiator, the inner core of the feed point is connected to the third rectangular radiator.

[0018] In one embodiment of the present invention, the length of the long side of the first rectangular radiator is equal to the length of the lower base of the first trapezoidal radiator, and the length of the upper base of the first trapezoidal radiator is equal to the length of the long side of the second rectangular radiator.

[0019] In one embodiment of the present invention, the sum of the diameter of the top of the funnel-shaped slit, the length of the second long side of the second rectangular radiator, and the length of the second long side of the fourth rectangular radiator is equal to the length of the fifth rectangular radiator.

[0020] In one embodiment of the present invention, the length of the first rectangular radiator ranges from 18 to 22 mm, and the width ranges from 13 to 17 mm.

[0021] In one embodiment of the present invention, the upper base of the first trapezoidal radiator has a range of 9 to 12 mm, and the height ranges from 27 to 31 mm.

[0022] In one embodiment of the present invention, the width of the second rectangular radiator 45 is in the range of 4 to 9 mm.

[0023] In one embodiment of the present invention, the length of the fifth rectangular radiator ranges from 40 to 48 mm, and the width ranges from 2 to 5 mm.

[0024] In one embodiment of the present invention, the distance between the power supply point and the second end of the tubular slit is in the range of 7 to 9 mm.

[0025] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0026] 1. This invention achieves multiple operating modes of the dipole antenna by widening the dipole width, connecting the ends of the two radiating arms of the dipole, and moving the feed point. It excites the dipole antenna in full-wave mode near the first resonant point and in half-wave mode near the second and third resonant points, thus enriching the technical path for widening the bandwidth of the dipole antenna. The three resonant points are combined to form a broadband coverage range of 1.7GHz to 3.7GHz. When the antenna reflection coefficient is below -10dB, the bandwidth of this dipole antenna with a funnel-shaped gap is 74%, improving the broadband coverage range of dipole antennas with a reflection coefficient below -10dB.

[0027] 2. The dipole antenna with a funnel-shaped gap provided by the present invention has a simple structure, is easy to manufacture, and has high practical value.

[0028] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0029] Figure 1 is a schematic diagram of a dipole antenna with a funnel-shaped gap provided in an embodiment of the present invention;

[0030] Figure 2 is a schematic diagram of the evolution process of a dipole antenna with a funnel-shaped gap provided in an embodiment of the present invention;

[0031] Figure 3 is a schematic diagram of the operating frequency-reflection coefficient curves for the five types of antennas corresponding to those in Figure 2.

[0032] Explanation of reference numerals in the attached figures:

[0033] 1. Metal reflector

[0034] 2 support columns

[0035] 3. Medium board

[0036] 4. Rectangular radiating layer; 41. First rectangular radiator; 42. Third rectangular radiator; 43. First trapezoidal radiator; 44. Second trapezoidal radiator; 45. Second rectangular radiator; 46. Fourth rectangular radiator; 47. Fifth rectangular radiator; 49. Funnel-shaped slit; 491. Tubular slit.

[0037] 5 power supply points. Detailed Implementation

[0038] To further illustrate the technical means and effects adopted by the present invention to achieve the intended purpose, the following detailed description of the solution according to the present invention is provided in conjunction with the accompanying drawings and specific embodiments.

[0039] The foregoing and other technical contents, features, and effects of the present invention will be clearly presented in the following detailed description of specific embodiments in conjunction with the accompanying drawings. Through the description of the specific embodiments, a more in-depth and concrete understanding can be gained of the technical means and effects adopted by the present invention to achieve its intended purpose. However, the accompanying drawings are for reference and illustration only and are not intended to limit the technical solutions of the present invention.

[0040] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations are intended to cover non-exclusive inclusion, such that an article or apparatus comprising a list of elements includes not only those elements but also other elements not expressly listed. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the article or apparatus that includes said element.

[0041] Please refer to Figure 1. Figure 1 is a schematic diagram of a dipole antenna with a funnel-shaped gap according to an embodiment of the present invention. The schematic diagram is a top view, and the X-axis, Y-axis, and Z-axis in the figure are three mutually perpendicular directions. The dipole antenna with a funnel-shaped gap includes: a metal reflector 1, a support column 2, a dielectric substrate 3, a rectangular radiating layer 4, and a feed point 5.

[0042] Specifically, the metal reflector 1 is used to reflect the backward radiation of the dipole antenna to form a directional radiation pattern, and its length and width are generally selected to be 1λ to 1.5λ. The support column 2 is connected to the upper end face of the metal reflector 1 to connect the metal reflector 1 and the dielectric plate 3.

[0043] Preferably, the distance between the metal reflector 1 and the dielectric plate 3 is typically set to 0.2–0.25λ to achieve directional radiation. In this embodiment, the distance between the metal reflector 1 and the dielectric plate 3, i.e., the height of the support column 2, is 24 mm, approximately 0.22λ.

[0044] A dielectric plate 3 is connected to the upper surface of the support column 2, and the upper surface area of ​​the dielectric plate 3 is smaller than that of the upper surface area of ​​the metal reflector 1. In this embodiment, the dielectric plate 3 is made of FR4 material with a relative permittivity of 4.4, and the thickness of the dielectric plate 3 is its height in the Z-axis direction, which is 1.6 mm. The length and width of the dielectric plate 3 are both 80 mm. In other embodiments, the permittivity, thickness, length, and width of the dielectric plate 3 can be selected according to actual needs.

[0045] A rectangular radiating layer 4 is disposed on the upper surface of the dielectric substrate 3. Further, the rectangular radiating layer 4 is printed on the upper surface of the dielectric substrate 3. A funnel-shaped slit 49 is formed within the rectangular radiating layer 4 along the Y-axis direction. The funnel-shaped slit 49 includes a funnel opening and a tubular slit 491 connected to the funnel opening. The bottom end of the tubular slit 491 of the funnel-shaped slit 49 extends to the edge of the rectangular radiating layer 4 in the X-axis direction. Specifically, the Y-axis direction is the length direction of the rectangular radiating layer 4, which is also the length direction of the funnel-shaped slit 49; the X-axis direction is the width direction of the rectangular radiating layer 4; the X-axis direction is perpendicular to the Y-axis direction; and the Z-axis direction is perpendicular to both the X-axis and Y-axis directions. In this embodiment, the X-axis direction is the left-right direction, the Y-axis direction is the front-back direction, and the Z-axis direction is the up-down direction.

[0046] Furthermore, the structures on both sides of the funnel-shaped slit 49 are symmetrical about the perpendicular bisector of the funnel-shaped slit 49, that is, the structures on both sides of the funnel-shaped slit 49 are symmetrical about the left and right sides of the funnel-shaped slit 49. The rectangular radiation layer 4 includes a first rectangular radiator 41, a first trapezoidal radiator 43, a second rectangular radiator 45, a third rectangular radiator 42, a second trapezoidal radiator 44, a fourth rectangular radiator 46, and a fifth rectangular radiator 47.

[0047] Specifically, on the first side of the funnel-shaped slit 49, a first rectangular radiator 41, a first trapezoidal radiator 43, and a second rectangular radiator 45 are sequentially connected from the bottom end of the tubular slit 491 to the top edge of the funnel opening. The first trapezoidal radiator 43 is a right-angled trapezoid. The long side of the first rectangular radiator 41 is connected to the lower base of the first trapezoidal radiator 43, and the length of the long side of the first rectangular radiator 41 is equal to the length of the lower base of the first trapezoidal radiator 43. Preferably, the length of the first rectangular radiator 41 is in the range of 18–22 mm, and the width is in the range of 13–17 mm. The upper base of the first trapezoidal radiator 43 is connected to the first long side of the second rectangular radiator 45, and the length of the upper base of the first trapezoidal radiator 43 is equal to the length of the long side of the second rectangular radiator 45. Preferably, the upper base of the first trapezoidal radiator 43 is in the range of 9–12 mm, the lower base is in the range of 18–22 mm, and the height is in the range of 27–31 mm. The width of the second rectangular radiator 45 is in the range of 4–9 mm. On the second side of the funnel-shaped slit 49, a third rectangular radiator 42, a second trapezoidal radiator 44, and a fourth rectangular radiator 46 are connected sequentially from the bottom end of the tubular slit 491 to the top edge of the funnel opening. The long side of the third rectangular radiator 42 is connected to the lower base of the second trapezoidal radiator 44, and the upper base of the second trapezoidal radiator 44 is connected to the first long side of the fourth rectangular radiator 46. The second trapezoidal radiator 44 is a right trapezoid. The third rectangular radiator 42 has the same size as the first rectangular radiator 41, and the second trapezoidal radiator 44 has the same size as the first trapezoidal radiator 43. The length of the third rectangular radiator 42 is equal to the length of the lower base of the second trapezoidal radiator 44, and the length of the upper base of the second trapezoidal radiator 44 is equal to the length of the long side of the fourth rectangular radiator 46. The fourth rectangular radiator 46 has the same size as the second rectangular radiator 45. The first side structure and the second side structure of the funnel-shaped slit 49 are symmetrical. The first rectangular radiator 41, the third rectangular radiator 42, the first trapezoidal radiator 43, the second trapezoidal radiator 44, the second rectangular radiator 45, the fourth rectangular radiator 46 and the fifth rectangular radiator 47 surround and form the funnel-shaped slit 49.

[0048] The first rectangular radiator 41 and the third rectangular radiator 42 are equivalent to two dipole arms of a conventional half-wave dipole. When only the first rectangular radiator 41 and the third rectangular radiator 42 are excited, the antenna current direction is along the X-axis, resulting in a narrow bandwidth. By increasing the width of the first rectangular radiator 41 and the third rectangular radiator 42 to a suitable range and improving the structure of the rectangular dipole arms in conjunction with the antenna impedance matching, a new dipole arm is formed, with the first rectangular radiator 41, the first trapezoidal radiator 43, and the second rectangular radiator 45 forming one dipole arm, and the third rectangular radiator 42, the second trapezoidal radiator 44, and the fourth rectangular radiator 46 forming the other dipole arm. Due to the increase in the Y-axis dimension, a current appears in the Y-axis direction, thus generating a new resonant point. Furthermore, the second rectangular radiator 45 and the fourth rectangular radiator 46 transition to the fifth rectangular radiator 47, which improves the port input impedance matching to a certain extent.

[0049] The fifth rectangular radiator 47 connects the second long side of the second rectangular radiator 45 and the second long side of the fourth rectangular radiator 46. The second long side of the second rectangular radiator 45 is the long side of the second rectangular radiator 45 that is furthest from the first trapezoidal radiator 43, and the second long side of the fourth rectangular radiator 46 is the long side of the fourth rectangular radiator 46 that is furthest from the second trapezoidal radiator 44. Further, the sum of the diameter of the top of the funnel-shaped slit 49, the length of the second long side of the second rectangular radiator 45, and the length of the second long side of the fourth rectangular radiator 46 is equal to the length of the fifth rectangular radiator 47. Preferably, the length of the fifth rectangular radiator 47 ranges from 40 to 48 mm, and the width ranges from 2 to 5 mm. The fifth rectangular radiator 47, located at the ends of the second rectangular radiator 45 and the fourth rectangular radiator 46, can excite the full-wave mode of the dipole antenna.

[0050] Feed point 5 is disposed within the tubular slit 491 in the funnel-shaped slit 49 and connects the rectangular radiating layers 4 on both sides of the tubular slit 491. Feed point 5 can feed the rectangular radiating layers 4 on the upper surface of the dielectric substrate 3. Further, feed point 5 is disposed at the first end of the tubular slit 491 near the opening of the funnel, and when the inner core of feed point 5 is connected to the first rectangular radiator 41, the outer core of feed point 5 is connected to the third rectangular radiator 42; when the outer core of feed point 5 is connected to the first rectangular radiator 41, the inner core of feed point 5 is connected to the third rectangular radiator 42. Preferably, the distance between feed point 5 and the second end of the tubular slit 491 is 7-9 mm. Since feed point 5 is located between the first rectangular radiator 41 and the third rectangular radiator 42, the edge of the first rectangular radiator 41 adjacent to feed point 5 and the edge of the third rectangular radiator 42 form a new current propagation path, thereby generating a new resonant point. In this embodiment, feed point 5 is an RF cable.

[0051] To illustrate the working principle of the dipole antenna with a funnel-shaped gap provided by the present invention, please refer to Figures 2 and 3. Figure 2 is a schematic diagram of the evolution process of a dipole antenna with a funnel-shaped gap provided by an embodiment of the present invention. In Figure 2, (a) to (e) correspond to five antenna structures, labeled as antenna 1 to antenna 5, respectively. Figure 3 is a schematic diagram of the operating frequency-reflection coefficient curves corresponding to the five antennas in Figure 2. In the figure, the horizontal axis represents the operating frequency in GHz, and the vertical axis represents the reflection coefficient (|S). 11 |), the unit is dB.

[0052] Specifically, antenna 1 is a traditional half-wave dipole antenna, whose width is much smaller than its length. It can resonate at the frequency points corresponding to odd modes such as 0.5λ, 1.5λ, and 2.5λ. As can be seen from Figure 3(a), the operating frequency of the first resonant point of antenna 1 is 2.1 GHz, which corresponds to the 0.5λ mode. That is, antenna 1 is operating in half-wave mode. At this time, antenna 1 only has current along the X-axis.

[0053] Increasing the dimension along the Y-axis, i.e., increasing the width of the half-wave dipole in antenna 1, so that the width and length of the half-wave dipole are comparable, forms antenna 2. Introducing current along the Y-axis theoretically increases the number of antenna resonant points. Antenna 2 is equivalent to a combination of a half-wave dipole extending along the X-axis and a half-wave dipole extending along the Y-axis. Therefore, based on the resonant point of antenna 1, a second resonant point located at approximately 3.5 GHz is introduced. Since the metal radiating layer extending along the Y-axis disturbs the metal radiating layer extending along the X-axis, as can be seen from Figure 3(a), the first resonant point of antenna 2, originally located at 2.1 GHz, shifts to a higher frequency of 2.8 GHz.

[0054] Connecting the ends of the arms of the two dipoles in antenna 2 forms antenna 3. Because the ends of the dipole arms are connected, the antenna operates in full-wave mode. The first resonant point of antenna 3 is around 1.7 GHz. At this point, antenna 3 is equivalent to two half-wave dipoles connected in series, with an equivalent length of 1λ, meaning antenna 3 operates in full-wave mode. Specifically, the first rectangular radiator 41 and the third rectangular radiator 42 are equivalent to the first dipole, while the second rectangular radiator 45, the fourth rectangular radiator 46, and the fifth rectangular radiator 47 are equivalent to the second half-wave dipole. Since the antenna wavelength is inversely proportional to the operating frequency, theoretically, the operating frequency of antenna 3, based on the first resonant point of antenna 2 at 2.8 GHz, should be reduced to half its original value, i.e., 1.4 GHz. However, due to the wavelength shortening effect, as shown in Figure 3(a), the theoretical value cannot be achieved; instead, the frequency is reduced to 1.7 GHz, forming the first resonant point of antenna 3. Simultaneously, the second resonant point of antenna 3, based on the second resonant point of antenna 2 at 3.5 GHz, also decreases to 2.6 GHz, forming the second resonant point of antenna 3.

[0055] To further extend the antenna bandwidth, the feed point 5, located at the bottom of the arms of the two dipoles in antenna 3, is moved upward to form antenna 4. The upward movement of feed point 5 increases the propagation path of the antenna current, thereby exciting the tubular gap 491 between the first rectangular radiator 41 and the third rectangular radiator 42. As can be seen from Figure 3(b), antenna 4 generates a third resonant point at the operating frequency of 4.1 GHz.

[0056] The structure of the dipole arm of antenna 4 was improved by removing part of the trapezoidal metal radiating layer to adjust the impedance matching degree and keep the reflection coefficient below -10dB, thus forming antenna 5. As can be seen from Figure 3(b), antenna 5 is based on the third resonant point of antenna 4 at 4.1GHz, which is moved to a lower frequency of 3.3GHz and merged with its first and second resonant points, forming a frequency coverage range of 1.7GHz to 3.7GHz.

[0057] This embodiment achieves multiple operating modes of the dipole antenna by widening the dipole width, connecting the ends of the two radiating arms of the dipole, and moving the feed point. It excites the dipole antenna in full-wave mode near the first resonant point and in half-wave mode near the second and third resonant points, thus enriching the technical path for widening the bandwidth of the dipole antenna. The three resonant points are combined to form a broadband coverage range of 1.7 GHz to 3.7 GHz. When the antenna reflection coefficient is below -10 dB, the bandwidth of this dipole antenna with a funnel-shaped gap is 74%, improving the broadband coverage range of the dipole antenna with a reflection coefficient below -10 dB.

[0058] Furthermore, the dipole antenna structure with a funnel-shaped gap provided in this embodiment is simple to manufacture and has high practical value.

[0059] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of the present invention, and all such modifications and substitutions should be considered within the scope of protection of the present invention.

Claims

1. A dipole antenna with a funnel-shaped gap, characterized in that, include: A metal reflector (1); a support column (2) connected to the upper end face of the metal reflector (1); a dielectric plate (3) connected to the upper surface of the support column (2); a rectangular radiation layer (4) disposed on the upper surface of the dielectric plate (3), wherein a funnel-shaped slit (49) is formed in the rectangular radiation layer (4) along the Y-axis direction, the bottom end of the tubular slit (491) of the funnel-shaped slit (49) extends to the edge of the rectangular radiation layer (4) in the X-axis direction, and the Y-axis direction is the rectangular radiation layer. The length direction of the radiation layer (4) is defined by the X-axis direction, which is the width direction of the rectangular radiation layer (4). The feed point (5) is located within the tubular slit (491) in the funnel-shaped slit (49) and connects the rectangular radiation layer (4) on both sides of the tubular slit (491). The rectangular radiation layer (4) includes: on the first side of the funnel-shaped slit (49), a first rectangular radiator (41) and a first trapezoidal radiator (4) are sequentially connected from the bottom end of the tubular slit (491) to the top edge of the funnel opening. 3) A second rectangular radiator (45), wherein the first trapezoidal radiator (43) is a right trapezoid; on the second side of the funnel-shaped slit (49), from the bottom end of the tubular slit (491) to the top edge of the funnel opening, a third rectangular radiator (42), a second trapezoidal radiator (44) and a fourth rectangular radiator (46) are connected in sequence, wherein the second trapezoidal radiator (44) is a right trapezoid; a fifth rectangular radiator (47) is connected to the second rectangular radiator (45) respectively. The second long side and the second long side of the fourth rectangular radiator (46), wherein the second long side of the second rectangular radiator (45) is the long side of the second rectangular radiator (45) that is away from the first trapezoidal radiator (43), and the second long side of the fourth rectangular radiator (46) is the long side of the fourth rectangular radiator (46) that is away from the second trapezoidal radiator (44). The first side structure of the funnel-shaped slit (49) and the second side structure of the funnel-shaped slit (49) are symmetrical.

2. The dipole antenna with a funnel-shaped gap according to claim 1, characterized in that, The power supply point (5) is located at the first end of the tubular slit (491) near the funnel opening. When the inner core of the power supply point (5) is connected to the first rectangular radiator (41), the outer core of the power supply point (5) is connected to the third rectangular radiator (42). When the outer core of the power supply point (5) is connected to the first rectangular radiator (41), the inner core of the power supply point (5) is connected to the third rectangular radiator (42).

3. The dipole antenna with a funnel-shaped gap according to claim 1, characterized in that, The length of the long side of the first rectangular radiator (41) is equal to the length of the lower base of the first trapezoidal radiator (43), and the length of the upper base of the first trapezoidal radiator (43) is equal to the length of the long side of the second rectangular radiator (45).

4. The dipole antenna with a funnel-shaped gap according to claim 1, characterized in that, The sum of the diameter of the top of the funnel opening of the funnel-shaped slit (49), the length of the second long side of the second rectangular radiator (45), and the length of the second long side of the fourth rectangular radiator (46) is equal to the length of the fifth rectangular radiator (47).

5. The dipole antenna with a funnel-shaped gap according to claim 1, characterized in that, The length of the first rectangular radiator (41) ranges from 18 to 22 mm, and the width ranges from 13 to 17 mm.

6. The dipole antenna with a funnel-shaped gap according to claim 1, characterized in that, The upper base of the first trapezoidal radiator (43) has a range of 9~12mm, and the height ranges of 27~31mm.

7. The dipole antenna with a funnel-shaped gap according to claim 1, characterized in that, The width of the second rectangular radiator (45) ranges from 4 to 9 mm.

8. The dipole antenna with a funnel-shaped gap according to claim 1, characterized in that, The length of the fifth rectangular radiator (47) ranges from 40 to 48 mm, and the width ranges from 2 to 5 mm.

9. The dipole antenna with a funnel-shaped gap according to any one of claims 1-8, characterized in that, The distance between the power supply point (5) and the second end of the tubular gap (491) is 7~9mm.

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