An ultra-wideband antenna

Abstract

An embodiment of the present invention provides an ultra-wideband antenna, which relates to the technical field of antennas. In order to adapt to a microwave radar chip of 10.525 GHz and be able to operate in a narrowband working system at a relatively high frequency. The antenna includes a dielectric substrate in the shape of a cuboid, a patch antenna is laid on the upper part of the front side of the dielectric substrate, and a rectangular ground plane is laid on the lower part of the back side; the shape of the patch antenna is oval or circular and has a central hollow, a feeder is provided on the lower part of the front side of the dielectric substrate, the feeder is a long strip-shaped metal sheet, one end of which is connected to the patch antenna and the other end coincides with the edge of the lower side of the dielectric substrate; an inverted U-shaped slot is opened at the connection between the patch antenna and the feeder, the arc end of the inverted U-shaped slot is located on the patch antenna and the end opposite to the arc end is located on the feeder; the thickness of the dielectric substrate is less than or equal to 2 mm and the dielectric constant is 2.2; the material of the patch antenna includes copper, and the material of the rectangular ground plane includes copper. The present invention is used in the field of communication.

Description

Technical Field

[0001] The present invention relates to the technical field of antennas, and particularly to an ultra-wideband antenna. Background Art

[0002] With the rapid development of wireless communication, the requirements for antennas by communication devices are getting higher and higher. Miniaturization, ultra-wideband, and excellent radiation characteristics have become essential features of antennas. Since the Federal Communications Commission of the United States released ultra-wideband antennas, ultra-wideband antennas have become a research hotspot. The ultra-wideband antenna is abbreviated as UWB (UltraWide Band, UWB) antenna. This antenna occupies a bandwidth of more than 500 MHz in the frequency band of 3.1 - 10.6 GHz, and the frequency band is divided into 3.1 - 10.6 GHz. Those operating within the UWB frequency band include many narrowband operating systems, wireless local area network WLAN (2.4 - 2.484 GHz, 5.15 - 5.825 GHz), satellite X-band (7.25 - 7.75 GHz), and International Telecommunication Union (ITU) band (8.01 - 8.5 GHz), etc.

[0003] In the prior art, there is a compact printed monopole UWB antenna, and the bandwidth of this antenna is about 7.91 GHz. Within the UWB operating frequency band, for wireless local area network WLAN (2.4 - 2.484 GHz, 5.15 - 5.825 GHz), satellite X-band (7.25 - 7.75 GHz), and International Telecommunication Union (ITU) band (8.01 - 8.5 GHz), there will be mutual interference between narrowband systems and UWB antennas.

[0004] In the prior art, there is also a miniaturized four-notch ultra-wideband antenna. Although it realizes the four-notch UWB characteristics, and the omnidirectional radiation characteristics of the antenna are good and the gain effect is prominent, which can effectively suppress the mutual interference between narrowband operating systems and UWB systems. However, the highest notch frequency band of such antennas is 8 - 8.54 GHz, and it is impossible to achieve notches at relatively high frequencies.

[0005] In summary, the notch frequencies of UWB antennas in the prior art are mostly below 9 GHz, which cannot adapt to microwave radar chips of 10.525 GHz and cannot operate in narrowband operating systems at relatively high frequencies. Summary of the Invention

[0006] To solve the above technical problems, the present invention proposes an ultra-wideband antenna to adapt to microwave radar chips of 10.525 GHz and be able to operate in narrowband operating systems at relatively high frequencies.

[0007] A ultra-wideband antenna, comprising: a dielectric substrate in the shape of a cuboid, on the upper part of the front side of the dielectric substrate, a patch antenna is laid, and on the lower part of the back side, a rectangular ground plane is laid, and the length of the rectangular ground plane is the same as the width of the dielectric substrate; the shape of the patch antenna is oval or circular, and there is a central hollow in the center, the shape of the central hollow is approximately convex-shaped, and the protruding part of the approximately convex-shaped is arc-shaped; on the lower part of the front side of the dielectric substrate, a feeder is provided, the feeder is a strip-shaped metal sheet, one end of which is connected to the patch antenna, and the other end coincides with the lower side edge of the dielectric substrate; an inverted U-shaped groove is opened at the connection of the patch antenna and the feeder, the arc end of the inverted U-shaped groove is located on the patch antenna, and the end of the inverted U-shaped groove opposite to the arc end is located on the feeder; the thickness of the dielectric substrate is less than or equal to 2 mm, and the dielectric constant is 2.2; the material of the patch antenna includes copper and silver, and the material of the rectangular ground plane includes copper and silver.

[0008] Wherein, the ultra-wideband antenna further comprises: a U-shaped groove, the U-shaped groove is located on the patch antenna and between the central hollow and the inverted U-shaped groove, and the U-shaped groove surrounds the central hollow.

[0009] Preferably, the ultra-wideband antenna further comprises: a C-shaped stub and an inverted C-shaped stub; the C-shaped stub and the inverted C-shaped stub are located on both sides of the feeder and are arranged asymmetrically and offset.

[0010] Wherein, the height of the inverted U-shaped groove is less than 9.1 mm, the distance between the two sides of the inverted U-shaped groove is 1.1 mm, and the groove width range of the inverted U-shaped groove is 0.005 - 0.01 mm.

[0011] Preferably, the arc-shaped of the protruding part is a semi-circle, the radius R of the semi-circle is 3 mm; the lower part of the protruding part is rectangular, the length of the rectangle is 10 mm, and the width is 4 mm.

[0012] Wherein, the arc-shaped of the protruding part is an ellipse, the major axis of the ellipse is 10 mm, and the minor axis is 7.9 mm; the lower part of the protruding part is rectangular, the length of the rectangle is 10 mm, and the width is 4 mm.

[0013] Preferably, the length of the C-shaped stub is less than or equal to 17.1 mm, and the length of the inverted C-shaped stub is less than or equal to 15.2 mm.

[0014] Wherein, the groove width of the U-shaped groove is less than or equal to 0.6 mm.

[0015] Preferably, the material of the dielectric substrate is Rogers5880. The size of the dielectric substrate is 38 mm in length, 42 mm in width, and 0.787 mm in thickness. The dielectric loss tangent angle of the dielectric substrate is 0.09%.

[0016] Among them, the length of the rectangular ground plane is 38 mm and the width is 19.5 mm.

[0017] An embodiment of the present invention provides an ultra-wideband antenna, which includes: a dielectric substrate in the shape of a cuboid. In order to ensure that the dielectric substrate has extremely low dielectric loss and is suitable for high-frequency and wide-band antennas, the relative permittivity is selected to be 2.2. The thinner the thickness, the better the antenna performance. Therefore, the thickness should not exceed 2 mm. A patch antenna is disposed on the upper part of the front surface of the dielectric substrate, and a rectangular ground plane is disposed on the lower part of the back surface. Copper and silver have excellent electrical conductivity. In order to ensure the feeding performance of the antenna, the material of the patch antenna is selected from copper and silver, and the material of the rectangular ground plane is also selected from copper and silver. Since the ellipse or circle is a gradual change shape, according to the impedance gradual change theory of the antenna, in order to ensure the broadening of the antenna bandwidth, an elliptical or circular antenna patch with a gradual change shape is selected, which can make the impedance of the antenna smaller and increase the bandwidth. Due to the equivalent effect of the outer edge, a convex-shaped hollow is made in the center of the patch antenna, so that the radiation performance of the antenna will not change significantly, but at the same time, the bandwidth will be broadened. The shape of the central hollow is approximately convex-shaped, and the protruding part of the convex-shaped central hollow is arc-shaped. Similarly, the structure with the protruding part of the approximately-shaped central hollow being arc-shaped has no sudden change, so that the antenna bandwidth can be made wider, and the process implementation requirements are also lower.

[0018] A feeder is provided at the lower part of the front surface of the dielectric substrate. The feeder is a strip-shaped metal sheet, one end of which is connected to the patch antenna, and the other end coincides with the lower side edge of the dielectric substrate. The feeder realizes the transmission of antenna signals. The connection between the patch antenna and the feeder is close to the feeder line, and the current density is relatively large. An inverted U-shaped slot is opened at the connection between the patch antenna and the feeder. The arc end of the inverted U-shaped slot is located on the patch antenna, and the end opposite to the arc end is located on the feeder, which can realize the excitation of the notch circuit at a higher frequency. If the position of the inverted U-shaped slot is too high, the notch at a high frequency cannot be realized. If the position of the inverted U-shaped slot is too low, the current density is too large, and changing the feeder structure is likely to cause a significant change in the antenna performance. Therefore, in order to avoid the very short wavelengths at high frequencies, which are likely to result in a resonant circuit and a too wide waveband, an inverted U-shaped slot is selected to be disposed at the connection between the patch antenna and the feeder, so that only the narrow bandwidth frequency band generates resonance to realize notch, and the effect is good. Thus, the notch characteristic at a relatively low frequency is realized. The notch frequency of this antenna is above 9 GHz, and it can adapt to the microwave radar chip of 10.525 GHz and work in a narrow-band working system at a relatively high frequency, effectively avoiding the mutual interference between this antenna and the narrow-band working system. Description of the Drawings

[0019] Figure 1 It is a schematic structural diagram of an ultra-wideband antenna provided by an embodiment of the present invention;

[0020] Figure 2 It is a schematic structural diagram of another ultra-wideband antenna provided by an embodiment of the present invention;

[0021] Figure 3 It is a schematic structural diagram of an inverted C-shaped stub in the structure of the ultra-wideband antenna provided by an embodiment of the present invention;

[0022] Figure 4 It is a schematic structural diagram of a C-shaped stub in the structure of the ultra-wideband antenna provided by an embodiment of the present invention;

[0023] Figure 5 It is a schematic structural diagram of a U-shaped slot in the structure of the ultra-wideband antenna provided by an embodiment of the present invention;

[0024] Figure 6 It is a schematic structural diagram of an inverted U-shaped slot in the structure of the ultra-wideband antenna provided by an embodiment of the present invention;

[0025] Figure 7 It is a simulation test diagram of the voltage standing wave ratio of an ultra-wideband antenna with a bandwidth of 2.6 - 20 GHz provided by an embodiment of the present invention;

[0026] Figure 8 It is a simulation test diagram of the voltage standing wave ratio of a four-notch ultra-wideband antenna with a notch at a relatively high frequency of 10.525 GHz provided by an embodiment of the present invention.

[0027] In the figure: 1 - Central hollow, 2 - Patch antenna, 3 - Dielectric substrate, 4 - Rectangular ground plane, 5 - Feeder, 6 - Inverted C-shaped stub, 7 - U-shaped slot, 8 - Inverted U-shaped slot, 9 - C-shaped stub. Detailed Embodiments

[0028] The following makes a detailed description of the specific embodiments of the present invention in conjunction with the accompanying drawings.

[0029] See Figure 1 and Figure 2, an embodiment of the present invention provides an ultra-wideband antenna, which includes: a dielectric substrate 3 in the shape of a cuboid, on the upper part of the front surface of the dielectric substrate 3, a patch antenna 2 is laid, and on the lower part of the back surface, a rectangular ground plane 4 is laid; the patch antenna 2 is in the shape of an ellipse or a circle and has a central hollow 1 in the center, the shape of the central hollow 1 is approximately convex-shaped, and the protruding part of the approximate convex shape is arc-shaped; on the lower part of the front surface of the dielectric substrate 3, a feeder 5 is provided, the feeder 5 is a long strip-shaped metal sheet, one end of which is connected to the patch antenna 2 and the other end coincides with the edge of the lower side of the dielectric substrate 3; a reverse U-shaped groove is opened at the connection between the patch antenna 2 and the feeder 5, the arc end of the reverse U-shaped groove is located on the patch antenna 2, and the end opposite to the arc end is located on the feeder 5; the thickness of the dielectric substrate 3 is less than or equal to 2 mm and the dielectric constant is 2.2; the material of the patch antenna 2 includes copper and silver, and the material of the rectangular ground plane 4 includes copper and silver.

[0030] An embodiment of the present invention provides an ultra-wideband antenna, which includes: a dielectric substrate in the shape of a cuboid. To ensure extremely low dielectric loss of the dielectric substrate and suitability for high-frequency and wide-band antennas, the dielectric constant is selected as 2.2. The thinner the thickness, the better the antenna performance. Therefore, the thickness of the dielectric substrate should not exceed 2 mm. On the upper part of the front surface of the dielectric substrate, a patch antenna is laid, and on the lower part of the back surface, a rectangular ground plane is laid; copper and silver have excellent electrical conductivity. To ensure the feeding performance of the antenna, the material of the patch antenna is selected from copper and silver, and the material of the rectangular ground plane is also selected from copper and silver. Since the ellipse or circle is a gradual change shape, according to the antenna impedance gradual change theory, in order to ensure broadening the bandwidth of the antenna, selecting a patch antenna with a gradual change shape of ellipse or circle can make the impedance of the antenna smaller and increase the bandwidth. Due to the equivalent effect of the outer edge, a convex-shaped hollow is made in the center of the patch antenna, so that the radiation performance of the antenna will not change significantly, but at the same time, the bandwidth will be broadened. The shape of the central hollow is approximately convex-shaped, and the protruding part of the convex-shaped central hollow is arc-shaped. Similarly, the structure with the protruding part of the approximate-shaped central hollow being arc-shaped has no sudden change, so that the antenna bandwidth can be made wider, and the process implementation requirements are also lower.

[0031] A feeder is provided at the lower part of the front side of the dielectric substrate. The feeder is a strip-shaped metal sheet, one end of which is connected to the patch antenna, and the other end coincides with the lower side edge of the dielectric substrate; the feeder realizes the transmission of antenna signals. The connection between the patch antenna and the feeder is close to the feed wire, and the current density is relatively large. An inverted U-shaped slot is opened at the connection between the patch antenna and the feeder. The arc end of the inverted U-shaped slot is located on the patch antenna, and the end opposite to the arc end is located on the feeder, which can realize the excitation of the notch circuit at a higher frequency. If the position of the inverted U-shaped slot is too high, the notch at a high frequency cannot be realized; if the position of the inverted U-shaped slot is too low, the current density is too large, and changing the feeder structure is likely to cause a significant change in the antenna performance. Therefore, in order to avoid the short wavelengths at high frequencies, which are likely to result in a resonant circuit and a too wide waveband, an inverted U-shaped slot is selected to be set at the connection between the patch antenna and the feeder, so that only a narrow bandwidth frequency band generates resonance to realize notch, and the effect is good. Thus, the notch characteristic at a relatively low frequency is realized. The notch frequency of this antenna is above 9 GHz, and it can adapt to a microwave radar chip of 10.525 GHz and work in a narrow-band working system at a relatively high frequency, effectively avoiding the mutual interference between this antenna and the narrow-band working system.

[0032] See Figure 2 and Figure 5 In the above-mentioned embodiment, the ultra-wideband antenna may further include a U-shaped slot 7. The U-shaped slot 7 is located on the patch antenna 2 and between the central hollow 1 and the inverted U-shaped slot 8, and the U-shaped slot 7 surrounds the central hollow 1. The U-shaped slot 7 is selected because its shape is close to the edge shape of the elliptical patch, and the current direction of the antenna is along the outer edge direction of the elliptical patch, which is close to the direction of the U-shaped slot 7. In this way, the current at a certain frequency point can form resonance in the U-shaped slot 7 loop to realize the notch function. The position of the U-shaped slot 7 cannot be placed above the central hollow 1 because the position above the patch is far from the feed wire, and the current density is low, so the resonant circuit cannot be excited in the U-shaped slot 7, and thus the notch cannot be realized.

[0033] See Figure 3 and Figure 4 In the above-mentioned embodiment, the ultra-wideband antenna may further include: a C-shaped stub 9 and an inverted C-shaped stub 6; the C-shaped stub 9 and the inverted C-shaped stub 6 are arranged on both sides of the feeder 5 asymmetrically and staggeredly. In order to avoid a large coupling effect caused by the stubs being too close to each other, resulting in a poor notch effect, the inverted C-shaped stub 6 and the C-shaped stub 9 are arranged on different sides of the antenna and are staggered up and down. The C-shaped stub 9 and the inverted C-shaped stub 6 cannot be arranged on the same side and cannot be symmetrically arranged. For example, the C-shaped stub 9 can be arranged above, or the inverted C-shaped stub 6 can be arranged above, but it must be ensured that the inverted C-shaped stub 6 and the C-shaped stub 9 are staggeredly arranged.

[0034] See Figure 6 In the above embodiment, the height L7 of the inverted U-shaped groove 8 is less than 9.1 mm, the distance L8 between the two sides of the inverted U-shaped groove 8 is 1.1 mm, and the groove width W3 of the inverted U-shaped groove 8 ranges from 0.005 to 0.01 mm, which can better realize the four-notch function. Notch of the 10.525 GHz microwave radar chip frequency band can be achieved to cope with the interference of the current Ku lower band radar narrowband system.

[0035] Participate Figure 1 Or Figure 2 In the above embodiment, the arc shape of the protruding part can be a semi-circle, which is convenient for increasing the bandwidth of the ultra-wideband antenna. The radius R of the semi-circle is 3 mm; the lower part of the protruding part can be a rectangle, the length of the rectangle can be 10 mm, and the width can be 4 mm. Alternatively, the arc shape of the central hollow 1 can be an ellipse, the major axis of the ellipse can be 10 mm, and the minor axis can be 7.9 mm. On the premise of ensuring the radiation performance of the ultra-wideband antenna, the size of the ultra-wideband antenna can be made smaller, and the processing of circles, ellipses or rectangles is convenient and the process implementation difficulty is low.

[0036] See Figure 3 In the above embodiment, the length of the C-shaped stub 9 can be less than or equal to 17.1 mm, and the length of the reverse C-shaped stub 6 can be less than or equal to 15.2 mm. An embodiment of the present invention provides a reverse C-shaped stub 6, one of its upper horizontal side lengths L1 is 4.5 mm, and the vertical side length L2 is 7 mm, and the other lower horizontal side length L3 is 3.7 mm. The reverse C-shaped stub 6 can generate a notch at a frequency of 8.00 - 8.20 GHz. See Figure 4 An embodiment of the present invention provides a C-shaped stub 9, one of its upper horizontal side lengths L4 is 5.85 mm, and the vertical side length L5 is 5.7 mm, and the other lower horizontal side length L6 is 5.6 mm. The C-shaped stub 9 can generate a notch at a frequency of 7.19 - 7.60 GHz.

[0037] See Figure 6 In the above, the groove width of the U-shaped groove 7 can be less than or equal to 0.6 mm. The groove width of the U-shaped groove 7 should not be too wide, and generally a narrow-width groove is selected. See Figure 5 In this embodiment, a U-shaped groove 7 with an arc shape is selected. The inner arc radius R1 of the U-shaped groove 7 is selected as 7.4 mm, and the outer arc radius R2 is selected as 8 mm. The U-shaped groove 7 can generate a notch at a frequency of 4.79 - 5.52 GHz.

[0038] See Figure 1 Or Figure 2, in the above embodiments, the material of the dielectric substrate 3 may be Rogers5880. The size of the dielectric substrate 3 is 38 mm in length, 42 mm in width, and 0.787 mm in thickness. The dielectric loss tangent angle of the dielectric substrate 3 is 0.09%. The length of the rectangular ground plane is 38 mm and the width is 19.5 mm. The Rogers5880 dielectric substrate 3 has extremely low dielectric loss, making it very suitable for high-frequency and broadband design applications. Selecting the above dimensions makes the overall size of the antenna smaller, enabling it to be applied in modern radar and communication fields. This antenna operates with coaxial feed. The overall size of the antenna is small and can be widely applied in miniaturized and integrated systems.

[0039] Since both copper and silver have good electrical conductivity, but the cost of silver is relatively high, copper can be selected as the material for manufacturing the patch antenna 2 and the rectangular ground plane 4. The coverage area of the patch antenna 2 and the rectangular ground plane 4 is preferably not overlapped to avoid affecting the performance of the ultra-wideband antenna.

[0040] In the present invention, by hollowing out the center of the elliptical or circular antenna patch, using the ideas of antenna impedance gradual change and outer edge equivalence, by adding an inverted C-shaped stub 6 above the left side of the feeder 5, adding a C-shaped stub 9 below the right side of the feeder 5, and opening a U-shaped slot 7 below the hollow 1 in the center of the elliptical patch, notches in the International Telecommunication Union (ITU) band, satellite X-band, and Wireless Local Area Network (WLAN) band are respectively achieved. By opening a narrow inverted U-shaped slot 8 above the feeder 5, a notch at a relatively high frequency of 10.525 GHz is achieved, effectively avoiding the interference of the microwave radar chip at the 10.525 GHz frequency, and thus achieving the purpose of four notches.

[0041] Please refer to Figure 7 and Figure 8 , Figure 7 is the standing wave ratio simulation curve of the UWB antenna, Figure 8 is the standing wave ratio simulation curve of the patch four-notch UWB antenna designed based on this UWB antenna. In the frequency band range of 2.6 - 20 GHz, the standing wave ratio of the UWB antenna is less than 2, achieving the UWB characteristic. In the frequency ranges of 4.79 - 5.52 GHz, 7.19 - 7.60 GHz, 8.00 - 8.20 GHz, and 10.23 - 10.68 GHz, the standing wave ratio of the patch four-notch UWB antenna is greater than 10, achieving the four-notch characteristic. Notches in the International Telecommunication Union (ITU) band, satellite X-band, and Wireless Local Area Network (WLAN) band are achieved within the UWB band, and a notch at a relatively high frequency is achieved at 10.525 GHz, effectively avoiding the interference of the Ku lower band radar narrowband system, and can be applied in modern radar and communication fields.

[0042] An embodiment of the present invention provides an ultra-wideband antenna, which includes: a dielectric substrate in the shape of a cuboid. In order to ensure extremely low dielectric loss of the dielectric substrate, being suitable for high-frequency and wide-band antennas, the relative permittivity is selected as 2.2, and the thinner the thickness, the better the antenna performance. Therefore, the thickness should not exceed 2 mm. On the upper part of the front surface of the dielectric substrate 3, a patch antenna is laid, and on the lower part of the back surface, a rectangular ground plane is laid; copper and silver have excellent electrical conductivity. To ensure the feeding performance of the antenna, the material of the patch antenna is selected from copper and silver, and the material of the rectangular ground plane is also selected from copper and silver. Since an ellipse or a circle is a gradually changing shape, according to the impedance gradual change theory of the antenna, in order to ensure the broadening of the antenna bandwidth, an elliptical or circular antenna patch with a gradually changing shape is selected, which can make the impedance of the antenna smaller and increase the bandwidth. Due to the equivalent effect of the outer edge, a convex-shaped hollow is made in the center of the patch antenna, so that the radiation performance of the antenna will not change significantly, but at the same time, the bandwidth will be broadened. The shape of the central hollow is approximately convex, and the protruding part of the convex-shaped central hollow is arc-shaped. Similarly, the structure with the protruding part of the approximately-shaped central hollow being arc-shaped has no sudden change, so that the antenna bandwidth can be made wider, and the process implementation requirements are also lower.

[0043] A feeder is provided at the lower part of the front surface of the dielectric substrate. The feeder is a strip-shaped metal sheet, one end of which is connected to the patch antenna, and the other end coincides with the edge of the lower side surface of the dielectric substrate; the feeder realizes the transmission of antenna signals. The connection between the patch antenna and the feeder is close to the feeder line, and the current density is relatively large. A reverse U-shaped slot is opened at the connection between the patch antenna and the feeder. The arc end of the reverse U-shaped slot is located on the patch antenna, and the end opposite to the arc end is located on the feeder, which can realize the excitation of the notch circuit at a relatively high frequency. If the position of the reverse U-shaped slot is too high, the notch at a high frequency cannot be realized; if the position of the reverse U-shaped slot is too low, the current density is too large, and changing the feeder structure is likely to cause a significant change in the antenna performance. Therefore, in order to avoid the short wavelengths at high frequencies, which are likely to result in a too wide wave band due to the resonance circuit, a reverse U-shaped slot is selected to be set at the connection between the patch antenna and the feeder, so that only the narrow bandwidth frequency band generates resonance to realize notch, and the effect is good. Thus, the notch characteristic at a relatively low frequency is realized. The notch frequency of this antenna is above 9 GHz, which can adapt to the microwave radar chip of 10.525 GHz and work in a narrow-band working system at a relatively high frequency, effectively avoiding the mutual interference between this antenna and the narrow-band working system.

[0044] For those skilled in the art, it is obvious that the embodiments of the present invention are not limited to the details of the above-mentioned exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the embodiments of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the embodiments of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the embodiments of the present invention. Any reference signs in the claims should not be construed as limiting the claims involved. In addition, it is obvious that the word "including" does not exclude other units or steps, and the singular does not exclude the plural. The multiple units, modules or devices stated in the system, apparatus or terminal claims can also be implemented by the same unit, module or device through software or hardware. The words such as "first" and "second" are used to indicate names and do not represent any specific order.

[0045] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the embodiments of the present invention and not to limit them. Although the technical solutions of the embodiments of the present invention have been described in detail with reference to the above preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the embodiments of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A ultra-wideband antenna, characterized in that, Comprising: A dielectric substrate in the shape of a cuboid, on the upper part of the front side of the dielectric substrate, a patch antenna is laid, and on the lower part of the back side, a rectangular ground plane is laid. The length of the rectangular ground plane is the same as the width of the dielectric substrate; the shape of the patch antenna is oval or circular, and there is a central hollow in the center. The shape of the central hollow is approximately convex-shaped, and the protruding part of the approximately convex shape is arc-shaped; on the lower part of the front side of the dielectric substrate, a feeder line is provided. The feeder line is a strip-shaped metal sheet, one end of which is connected to the patch antenna, and the other end coincides with the edge of the lower side of the dielectric substrate; at the connection of the patch antenna and the feeder line, an inverted U-shaped slot is opened. The arc end of the inverted U-shaped slot is located on the patch antenna, and the end of the inverted U-shaped slot opposite to the arc end is located on the feeder line; the thickness of the dielectric substrate is less than or equal to 2 mm, and the dielectric constant is 2.2; the material of the patch antenna includes copper and silver, and the material of the rectangular ground plane includes copper and silver; The ultra-wideband antenna further includes: a U-shaped slot, which is located on the patch antenna and between the central hollow and the inverted U-shaped slot, and the U-shaped slot surrounds the central hollow; The ultra-wideband antenna further includes: a C-shaped stub and an inverted C-shaped stub; the C-shaped stub and the inverted C-shaped stub are located on both sides of the feeder line and are arranged asymmetrically and offset.

2. The ultra-wideband antenna according to claim 1, characterized in that, The height of the inverted U-shaped slot is less than 9.1 mm, the distance between the two sides of the inverted U-shaped slot is 1.1 mm, and the width range of the slot of the inverted U-shaped slot is 0.005 - 0.01 mm.

3. The ultra-wideband antenna according to claim 2, wherein, The arc of the protruding part is a semi-circle, and the radius of the semi-circle is 3 mm; the lower part of the protruding part is rectangular, the length of the rectangle is 10 mm, and the width is 4 mm.

4. The ultra-wideband antenna according to claim 2, characterized in that, The arc of the protruding part is an ellipse, the major axis of the ellipse is 10 mm, and the minor axis is 7.9 mm; the lower part of the protruding part is rectangular, the length of the rectangle is 10 mm, and the width is 4 mm.

5. The ultra-wideband antenna according to claim 3 or 4, characterized in that, The length of the C-shaped stub is less than or equal to 17.1 mm, and the length of the inverted C-shaped stub is less than or equal to 15.2 mm.

6. The ultra-wideband antenna according to claim 3 or 4, characterized in that The width of the slot of the U-shaped slot is less than or equal to 0.6 mm.

7. The ultra-wideband antenna according to claim 3 or 4, characterized in that, The material of the dielectric substrate is Rogers5880, the size of the dielectric substrate is 38 mm in length, 42 mm in width, and 0.787 mm in thickness; the dielectric loss tangent angle of the dielectric substrate is 0.09%.

8. The ultra-wideband antenna according to claim 7, wherein The length of the rectangular ground plane is 38 mm, and the width is 19.5 mm.

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