Log-periodic antenna and display device

Abstract

The invention provides a log-periodic antenna, and belongs to the technical field of communication. The log-periodic antenna disclosed by the invention comprises a feed assembly and N radiation structures, each radiation structure is electrically connected with the feed assembly, and the number of connection nodes is M; n > = 3, M > = 3; wherein the distance between the M connecting nodes meets the periodic change.

Description

Log-periodic antenna and display device Technical Field

[0001] The present disclosure belongs to the field of communication technology, and particularly relates to a log-periodic antenna and a display device. Background Art

[0002] In the 5G millimeter wave frequency band, antenna size will be reduced to the millimeter level. Due to the poor diffraction resistance of antennas in the millimeter wave band, millimeter wave antennas generally require arrays. AiP technology, aligning with the increasing integration of silicon-based semiconductor processes, balances antenna performance, cost, and size, representing the development trend of millimeter wave terminals in recent years. Other types of millimeter wave antennas, such as AiAiP (antennas-in-antenna-in-package), AoD (antenna on display), and AiME (antenna in metalframe), are currently being explored as millimeter wave solutions, with AoD offering significant advantages. Compared to bezels, back-end modules, and back covers, AoD offers a wider range of available areas and a relatively simple electromagnetic environment, making it less susceptible to interference from other signals. However, since displays (OLED or LCD) are not transparent, AoD applications require addressing at least two issues: gain and RF connectivity. To achieve extended coverage, AoD gain must meet spatial coverage standards. Since the AoD is built above the light-emitting layer, the antenna usually needs to be gridded to ensure that the display effect is not affected. However, gridding affects the radiation efficiency. Therefore, how to improve the gain within a limited grid is currently a difficulty in the application of AoD.

[0003] Summary of the Invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art and provides a log-periodic antenna and a display device.

[0005] An embodiment of the present disclosure provides a log-periodic antenna, which includes a feeding component and N radiating structures; each of the radiating structures is electrically connected to the feeding component, and the number of connection nodes is M; N ≥ 3, M ≥ 3; wherein the spacing between the M connection nodes satisfies periodic variation.

[0006] The radiation structure includes a radiation part and a feeder line. The radiation part has a gap. One end of the feeder line is located in the gap and electrically connected to the radiation part, and the other end is electrically connected to the feeding component.

[0007] The notch has a first side electrically connected to the feeder, and a second side and a third side connected to both ends of the first side. The second side and the third side are in the same extension direction as the feeder and are arranged perpendicular to the first side.

[0008] Wherein, the outline of the radiation portion is substantially a regular octagon.

[0009] The feeding component has a first side and a second side that are arranged opposite to each other, and the radiation structure is connected to both the first side and the second side of the feeding component.

[0010] The radiating structure includes a radiating portion and a feeder line, wherein the radiating portion is electrically connected to the feeding assembly via the feeder line;

[0011] The connection nodes between each of the radiation structures and the feeding structure are different, and the radiation portion of each of the radiation structures decreases in size along a direction away from the feeding end of the feeding component and satisfies periodic variation.

[0012] The radiating structures connected to the first side and the second side of the feed assembly are arranged in a one-to-one correspondence, and the connection node between the corresponding radiating structures and the feed assembly is the same node; the radiating structure includes a radiating portion and a feeder, and the radiating portion is electrically connected to the feed assembly through the feeder;

[0013] The radiating parts of the corresponding radiating structures have the same size; the radiating parts of each of the radiating structures connected to the first side of the feeding component have a size that decreases in the direction away from the feeding end of the feeding component and satisfies a periodic change; the radiating parts of each of the radiating structures connected to the second side of the feeding component have a size that decreases in the direction away from the feeding end of the feeding component and satisfies a periodic change.

[0014] The feed line has a single extension direction and intersects with the extension direction of the feeding component.

[0015] The feeder includes a first sub-feeder and a second sub-feeder, and the extension directions of the first sub-feeder and the second sub-feeder are different; the first end of the first sub-feeder is connected to the feeding component, the second end of the first sub-feeder is connected to the first end of the second sub-feeder, and the second end of the second sub-feeder is connected to the radiating part.

[0016] The feeding component has a first side and a second side that are arranged opposite to each other, and each of the radiating structures is connected to the first side or the second side of the feeding component.

[0017] Wherein, the radiating structure includes a radiating portion and a feeder line, and the radiating portion is electrically connected to the feeding assembly through the feeder line;

[0018] The connection nodes between each of the radiation structures and the feeding structure are different, and the radiation portion of each of the radiation structures decreases in size along a direction away from the feeding end of the feeding component and satisfies periodic variation.

[0019] Wherein, the radiating structure includes a radiating portion and a feeder line, and the radiating portion is electrically connected to the feeding assembly through the feeder line;

[0020] Every two adjacent radiating structures form a group. For a group of radiating structures, each radiating structure feeder includes a first sub-feeder and a second sub-feeder, and the first sub-feeder and the second sub-feeder extend in different directions; the first end of the first sub-feeder is connected to the feeding assembly, the second end of the first sub-feeder is connected to the first end of the second sub-feeder, and the second end of the second sub-feeder is connected to the radiating portion; the first sub-feeder of the two radiating structures is shared, the second sub-feeders of the two radiating structures are symmetrically arranged with the extension direction of the first feeder as the symmetry axis, and the radiating portions of the two radiating structures have the same size;

[0021] The size of the radiating portion of each group of the radiating structures decreases gradually along a direction away from the feeding end of the feeding assembly, and satisfies a periodic variation.

[0022] The length of the first sub-feeder of each group of the radiation structures increases gradually along the direction away from the feeding end of the feeding assembly.

[0023] The feeding port of the feeding component includes a first substructure, a second substructure and a third substructure connected in sequence; the second substructure is configured to configure the impedance of the first substructure to the impedance of the third substructure.

[0024] An embodiment of the present disclosure provides a display device, comprising a display module and an antenna module arranged on a light-emitting surface side of the display module; the antenna module comprises at least one log-periodic antenna as described above.

[0025] The antenna module includes a radiation layer; the radiation layer is a metal grid structure, and the log-periodic antenna is located in the radiation layer.

[0026] Wherein, the radiation layer further includes a redundant radiation structure.

[0027] Wherein, the display device further includes a polarizer, and the antenna module is arranged on a side of the polarizer close to the display module.

[0028] The display device further includes a touch module, and the touch module is located between the display module and the antenna module.

[0029] Wherein, the display module is an organic electroluminescent diode display module. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] FIG1 is a schematic diagram of film layers of a display device according to an embodiment of the present disclosure.

[0031] FIG2 is a top view of a log-periodic antenna according to an embodiment of the present disclosure.

[0032] FIG3 is a top view of the radiation layer according to an embodiment of the present disclosure.

[0033] FIG4 is a top view of a radiation structure according to an embodiment of the present disclosure.

[0034] FIG5 is a top view of another log-periodic antenna according to an embodiment of the present disclosure.

[0035] FIG6 is a gain curve diagram of each radiation structure in FIG5 .

[0036] FIG. 7 is an S-parameter graph of each radiation structure in FIG. 5 .

[0037] FIG8 is a schematic diagram of a feeding port of a feeding assembly according to an embodiment of the present disclosure.

[0038] FIG9 is a gain curve diagram of the first exemplary log-periodic antenna according to an embodiment of the present disclosure.

[0039] FIG10 is an S-parameter curve diagram of the first example log-periodic antenna according to an embodiment of the present disclosure.

[0040] FIG11 is a top view of the antenna module of the first example of an embodiment of the present disclosure.

[0041] FIG12 is a gain curve diagram of the first example antenna module according to an embodiment of the present disclosure.

[0042] FIG13 is an S-parameter curve diagram of the antenna module of the first example of an embodiment of the present disclosure.

[0043] FIG14 is a top view of a second exemplary log-periodic antenna according to an embodiment of the present disclosure.

[0044] FIG15 is a gain curve diagram of the second example log-periodic antenna according to an embodiment of the present disclosure.

[0045] FIG16 is an S-parameter curve diagram of the second example log-periodic antenna according to an embodiment of the present disclosure.

[0046] FIG17 is a top view of a second exemplary antenna module according to an embodiment of the present disclosure.

[0047] FIG18 is a gain curve diagram of the second example antenna module according to an embodiment of the present disclosure.

[0048] FIG19 is an S-parameter curve diagram of the second example antenna module according to an embodiment of the present disclosure.

[0049] FIG20 is a top view of a third exemplary log-periodic antenna according to an embodiment of the present disclosure.

[0050] FIG21 is a gain curve diagram of the third example log-periodic antenna according to an embodiment of the present disclosure (comparison between three radiating structures and five radiating structures).

[0051] FIG22 is an S-parameter graph of the third exemplary log-periodic antenna according to an embodiment of the present disclosure (comparison between three radiating structures and five radiating structures).

[0052] FIG23 is a top view of the antenna module of the third example of the embodiment of the present disclosure.

[0053] FIG24 is a top view of a log-periodic antenna according to a fourth example of an embodiment of the present disclosure.

[0054] FIG25 is a top view of another antenna of the fourth example of an embodiment of the present disclosure.

[0055] FIG26 is a top view of another antenna of the fourth example of the embodiment of the present disclosure.

[0056] FIG27 is a gain curve of the antenna shown in FIG25 and FIG26 according to an embodiment of the present disclosure.

[0057] FIG28 is an S-parameter curve of the antenna shown in FIG25 and FIG26 according to an embodiment of the present disclosure.

[0058] FIG29 is a top view of the antenna module of the fourth example of the embodiment of the present disclosure.

[0059] FIG30 is a gain curve diagram of the fourth example antenna module of an embodiment of the present disclosure.

[0060] FIG31 is an S-parameter curve diagram of the fourth example antenna module of an embodiment of the present disclosure.

[0061] FIG32 is a top view of the log-periodic antenna gain of the fifth example of an embodiment of the present disclosure.

[0062] FIG33 is a top view of the fifth example log-periodic antenna of an embodiment of the present disclosure.

[0063] FIG34 is a gain curve diagram of the fifth example log-periodic antenna according to an embodiment of the present disclosure.

[0064] FIG35 is a top view of a sixth example log-periodic antenna according to an embodiment of the present disclosure.

[0065] FIG36 is a gain curve diagram of the sixth example log-periodic antenna according to an embodiment of the present disclosure.

[0066] FIG37 shows the S parameters of the log-periodic antenna of the sixth example according to an embodiment of the present disclosure.

[0067] FIG38 is a top view of a log-periodic antenna according to the seventh example of an embodiment of the present disclosure.

[0068] FIG39 is a top view of another log-periodic antenna of the seventh example of an embodiment of the present disclosure.

[0069] FIG40 is a top view of the log-periodic antenna shown in FIG40 of an embodiment of the present disclosure.

[0070] FIG41 is a gain curve diagram of the log-periodic antenna shown in FIG40 according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0071] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0072] Unless otherwise defined, the technical or scientific terms used in this disclosure should have the usual meanings understood by people with ordinary skills in the field to which this disclosure belongs. The words "first", "second" and similar words used in this disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, words such as "one", "an" or "the" do not indicate a quantity limitation, but rather indicate the existence of at least one. Words such as "include" or "comprise" mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Words such as "connect" or "connected" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0073] Log-periodic antennas are widely used in communications, broadcasting, television, and other fields in the shortwave, ultrashortwave, and even microwave frequency bands due to their simple structure, impedance matching, and frequency-invariant directional performance. This disclosure provides a technical solution for applying log-periodic antennas to screens.

[0074] Before describing the log-periodic antenna of the embodiment of the present disclosure, it should be noted that the log-periodic antenna in the embodiment of the present disclosure can be integrated into a display device. Figure 1 is a schematic diagram of the film layer of the display device of the embodiment of the present disclosure; Figure 2 is a top view of a log-periodic antenna of the embodiment of the present disclosure; as shown in Figures 1 and 2, specifically, the display device may include a display module and an antenna module arranged on the light-emitting side of the display module, and the antenna module may include at least one log-periodic antenna in the embodiment of the present disclosure. In this case, there is no need to set up a separate grounding layer for the log-periodic antenna, and the wire layer in the display module can be used as a reference ground in the log-periodic antenna. Of course, the log-periodic antenna in the embodiment of the present disclosure is not limited to application in display devices, but can also be applied to other electronic devices. In the embodiment of the present disclosure, only the application of the log-periodic antenna in the display device is taken as an example, but this does not constitute a limitation on the scope of protection of the embodiment of the present disclosure.

[0075] 2 , the log-periodic antenna includes a feed assembly 12 and N radiating structures 11, where N ≥ 3. The radiating structure 11 includes a feed line 111 and a radiating portion 112 electrically connected to the feed line 111. Furthermore, the feed line 111 is also connected to the feed assembly 12. In the log-periodic antenna, along the direction away from the feed port of the feed assembly 12, the size of the radiating portion 112 of each radiating structure 11 sequentially connected to the feed assembly 12 varies periodically. It should be noted that if the outline of the radiating portion 112 is a regular octagon, the size of the radiating portion 112 is determined by the length of its side, and the size of the radiating portion varies periodically, that is, the length of the side of the radiating portion varies periodically. For example, the feed assembly 12 is sequentially connected to five radiating structures 11 along the direction away from the feed port of the feed assembly 12. The side lengths of the first to fifth radiating parts are LP1, LP2, LP3, LP4, and LP5 respectively; the scaling factor is set to t, LP2 = t*LP1; LP3 = t*LP2; LP4 = t*LP3; LP5 = t*LP4.

[0076] In some examples, continuing to refer to FIG1 , the display module in the display device in the embodiment of the present disclosure may be an organic light-emitting diode display module or a liquid crystal display module. In the embodiment of the present disclosure, the display module is an organic light-emitting diode display module as an example for description. Specifically, the organic light-emitting diode display module may include a base substrate 101, a plurality of pixel units arranged on the base substrate 101, and an encapsulation layer 118 is provided on the side of the pixel unit away from the base substrate. Each pixel unit includes a pixel driving circuit and an organic light-emitting diode OLED; the pixel driving circuit is composed of thin-film transistors and storage capacitors and other electrical components. FIG1 only illustrates the thin-film transistor electrically connected to the organic light-emitting diode OLED. The film layer structure of the remaining thin-film transistors is the same or substantially the same as that of the thin-film transistor, so the following description is only based on the film layer setting of one thin-film transistor as an example. 1 , the thin film transistor may be a top-gate type, and may include an active layer 104, a first gate insulating layer 105, a gate electrode 106, a second gate insulating layer 108, an interlayer dielectric layer 103, a source electrode 110, and a drain electrode 111. Specifically, the active layer 104 may be formed on the buffer layer 102, the first gate insulating layer 105 covers the buffer layer 102 and the active layer 104, the gate electrode 106 is formed on a side of the first gate insulating layer 105 facing away from the active layer 104, the second gate insulating layer 108 covers the gate electrode 106 and the first gate insulating layer 105, the interlayer dielectric layer 103 covers the second gate insulating layer 108, the source electrode 110 and the drain electrode 107 are formed on a side of the interlayer dielectric layer 103 facing away from the substrate and are located on opposite sides of the gate electrode 106, respectively. The source electrode 110 and the drain electrode 107 may respectively contact opposite sides of the active layer 104 through vias (e.g., metal vias). It should be understood that this thin-film transistor can also be a bottom-gate type. A planarization layer 116 can be formed between the thin-film transistor and the organic electroluminescent diode. This planarization layer 116 can have a single-layer structure or a multi-layer structure. This planarization layer 116 is typically made of organic materials, such as photoresist, acrylic-based polymers, silicon-based polymers, etc. As shown in Figure 1, the planarization layer 116 is located on the side of the thin-film transistor's source 110 and drain 107 that faces away from the interlayer dielectric layer.The first electrode 112 of the organic electroluminescent diode OLED can be electrically connected to the drain electrode 107 through a metal via. The first electrode 114b can be an anode, and the anode can be made of materials such as ITO (indium tin oxide), indium zinc oxide (IZO), and zinc oxide (ZnO). The pixel definition layer 109 can cover the planarization layer 116. The pixel definition layer 109 can be made of an organic material, such as a photoresist, and the pixel definition layer 109 has a pixel opening that exposes the first electrode 114b. The light-emitting layer 114a of the organic electroluminescent diode OLED is located in the pixel opening and is formed on the first electrode 114b. The light-emitting layer 114a may include Small molecule organic materials or polymer molecule organic materials can be fluorescent or phosphorescent materials, and can emit red, green, blue, or white light. Furthermore, depending on actual needs, in different examples, the light-emitting layer 114a can further include functional layers such as an electron injection layer, an electron transport layer, a hole injection layer, and a hole transport layer. The second electrode 114c of the organic electroluminescent diode covers the light-emitting layer 114a, and the polarity of the second electrode 114c is opposite to that of the first electrode 114b. This second electrode 114c can be a cathode, and can be made of a metal material such as lithium (Li), aluminum (Al), magnesium (Mg), or silver (Ag). The encapsulation layer 118 is located on the side of the organic electroluminescent diode facing away from the thin film transistor. The encapsulation layer 118 can include a first inorganic encapsulation thin film layer 118a, an organic encapsulation thin film layer 118b, and a second inorganic encapsulation thin film layer 118c, which are stacked in sequence. The first and second inorganic encapsulation film layers 118a, 118c are used to prevent water and oxygen from entering the light-emitting layer 114a. They can be made of inorganic materials such as silicon nitride and silicon oxide. The organic encapsulation film layer 118b is used to achieve a planarization effect to facilitate the formation of the second inorganic encapsulation film layer 118c. This organic encapsulation film layer 118b can be made of materials such as acrylic polymers and silicon polymers.

[0077] In some examples, referring again to FIG. 1 , the display device of the present disclosure can be a touch display device. In this case, a touch module 120 is further disposed on the side of the encapsulation layer facing away from the organic electroluminescent device. A buffer layer 119 can be disposed between the touch module 120 and the encapsulation layer 118. The touch module 120 can include multiple rows of touch electrodes and multiple columns of sensing electrodes. Each row of touch electrodes includes multiple touch electrode blocks and a connector connecting adjacent touch electrode blocks; each column of sensing electrodes includes multiple sensing electrode blocks and a bridge connecting adjacent sensing electrode blocks. In some examples, the touch electrode blocks, connector, and sensing electrode blocks are located on the same layer, on the side of the buffer layer 119 facing away from the encapsulation layer 118. The bridge is located on the side of the layer containing the touch electrode blocks, connector, and sensing electrode blocks facing away from the buffer layer 119, and is intersecting with the connector. It should be understood that an insulating layer is used between the connector and the bridge to prevent short circuits.

[0078] Furthermore, when the display device has a touch module 120, the log-periodic antenna of the antenna module can be arranged on the side of the touch module 120 away from the encapsulation layer 118. The log-periodic antenna can be fixed to the touch module by a first adhesive layer 121. The first adhesive layer can specifically be a transparent optically conductive adhesive (OCA). Furthermore, the display device also includes a polarizer 122 located on the side of the log-periodic antenna away from the touch module 120. Of course, a cover glass 124 is also provided on the side of the polarizer 122 away from the log-periodic antenna as a protective glass. The polarizer and the cover glass are bonded and fixed by a second adhesive layer 123, and the second adhesive layer 123 can specifically be a transparent optically conductive adhesive.

[0079] It should be noted that the display device in the embodiment of the present disclosure may not be provided with the touch module 120 . In this case, the log-periodic antenna 100 is provided between the packaging layer 118 and the polarizer 123 .

[0080] In some examples, Figure 3 is a top view of a radiating layer in an embodiment of the present disclosure. Referring to Figure 3 , the log-periodic antenna in this embodiment includes a radiating layer 100, which may be a metal mesh structure. The feed assembly 12 of the log-periodic antenna and the radiating structure 11 electrically connected to the feed assembly 12 are located in the radiating layer 100. This arrangement effectively improves light transmittance. Furthermore, by properly configuring the period and angle of the metal mesh structure, moiré patterns can be reduced.

[0081] Furthermore, the metal grid structure may include a plurality of first metal wires arranged crosswise and a plurality of second metal wires arranged crosswise. The first metal wires are arranged side by side along the first direction and extend along the second direction; the second metal wires are arranged side by side along the first direction and extend along the third direction. In the embodiment of the present disclosure, the light transmittance of each layer of the metal grid structure adopted is about 70%-88%. The extension directions of the first metal wires and the second metal wires of the metal grid structure can be perpendicular to each other, in which case a positive direction or a rectangular hollow portion is formed. Of course, the extension directions of the first metal wires and the second metal wires of the metal grid structure can be non-vertical, for example: the angle between the extension directions of the first metal wires and the second metal wires is 45°, in which case a diamond-shaped hollow portion is formed. For example: the line width W1 of the first metal wire and the second metal wire are both about 1-30μm, the line spacing W2 is about 50-250μm; the line thickness is about 0.5-10μm. In the following examples of the present embodiment, the radiation structure 11 and the feeding component 12 both adopt a metal grid structure, and in the simulation experiment of the following examples, the line width and line thickness of the first metal line and the second metal line are taken as 1.5μm*3μm.

[0082] Furthermore, the radiation layer of the embodiment of the present disclosure not only includes the above-mentioned structure, but also includes a redundant radiation structure 13, which is disconnected from the radiation structure 11. This arrangement improves the display uniformity of the display device. In this case, the radiation structure 11 and the redundant radiation structure 13 can be formed using a single patterning process, and the radiation structure 11 and the redundant radiation structure 13 can be formed by forming a whole layer of crossed first and second metal wires, and then disconnecting the first and second metal wires to form the radiation structure 11 and the redundant radiation structure 13. In some examples, the width of the disconnected position of the first and second metal wires in the first radiation layer is about 1-30 μm. Of course, the width of the disconnected position can also be specifically limited according to the radiation requirements of the antenna.

[0083] Furthermore, the log-periodic antenna includes not only a radiation layer, but also a base layer, an adhesive layer, a protective layer and a dielectric substrate. The radiation layer is integrated on the dielectric substrate, and the specific dielectric substrate has a groove. The radiation layer can be formed in the groove by electroplating a seed layer. The protective layer covers one side of the dielectric substrate, and the base layer is connected to the protective layer through an adhesive layer. The base layer adopts a flexible film, and the material of the flexible film includes but is not limited to polyethylene terephthalate (PET) or polyimide (PI). The protective layer can be an inorganic insulating layer formed by silicon nitride (SiNx), or an inorganic insulating layer formed by silicon oxide (SiO2), or a laminated composite film layer of several SiNx inorganic insulating layers and SiO2 inorganic insulating layers. The dielectric substrate can be glass-based. The adhesive layer can be a transparent optical conductive adhesive.

[0084] In some examples, referring to FIG2 , each radiating structure 11 includes a radiating portion 111 mainly used for radiating electromagnetic waves, and a feeder line 112 electrically connecting the radiating portion 111 to the feeding assembly 12. The outline of the radiating portion 111 can be a regular octagon or a roughly regular octagon. It should be noted that being roughly a regular octagon means that on the basis of the original octagon, one or several sides are bent, but the main structure of the shape is still an octagon. Of course, the outline of the radiating portion 111 can also be other shapes, such as a square, a rectangle, a regular hexagon, etc. In the embodiment of the present disclosure, the radiating portion 111 is taken as an example of an octagon or a roughly octagon. The reason for using an octagon or a roughly octagon is that it is closer to a rectangular microstrip antenna. When forming an antenna array, it can make the structure more compact and reduce the spacing between antennas.

[0085] Furthermore, FIG4 is a top view of a radiating structure according to an embodiment of the present disclosure. Referring to FIG4 , a notch 113 is provided in the radiating portion 111. One end of the feed line 112 is located within the notch 113 and electrically connected to the radiating portion 111, while the other end is electrically connected to the feed assembly 12. In the embodiment of the present disclosure, the notch 113 is provided in the radiating portion 111, and the feed line 112 is connected to the notch 113 to reduce reflections generated by the connection between the feed line 112 and the radiating portion 111.

[0086] Furthermore, the notch 113 has a first side electrically connected to the feed line 112, and a second side and a third side connected to both ends of the first side. The second side and the third side extend in the same direction as the feed line 112 and are arranged perpendicular to the first side. In other words, the notch 113 is a rectangular notch 113, and this arrangement can improve the S parameter.

[0087] Specifically, the side length of the radiating portion 111 of the regular octagon (the side without the notch 113) is LP, and the length of the feed line 112 is LS. The distance between the connection position of the first side of the feed line 112 and the notch 113 to the second side is insert_y, and the lengths of the second and third sides are insert_x. A parameter scan of the dimensions of the regular octagon shows that the main dimensions affecting the gain and S parameters are LP and insert_x. These two parameters determine the final S parameters and gain, and different insert_y has little effect on the S parameters and gain. Among them, although LS has basically no effect on the S parameters and gain in the unit, in the combined structure of different units, LS will affect the phase of the radiating unit, so LS is also a key parameter.

[0088] The three parameters LP, insert_x, and LS affect the S parameters and gain of the radiation structure 11. By scaling these three parameters according to a certain rule, the S parameters and gain at different frequencies can be obtained. The scaling factor is t, with t being 1.04 as an example. Figure 5 is a top view of another logarithmic periodic antenna according to an embodiment of the present disclosure; referring to Figure 5, there are five radiation structures 11, and the LS in the first to fifth radiation structures 11 are represented by LS1, LS2, LS3, len_strip4, and len_strip5 respectively, and insert_x is represented by insert_x1, insert_x2, insert_x3, insert_x4, and insert_x5 respectively.

[0089] LP2=t*LP1; insert_x2=t*insert_x1; LS2=t*LS1;

[0090] LP3=t*LP2; insert_x3=t*insert_x2; LS3=t*LS2;

[0091] Similarly, the S-parameters and gains of octagonal radiating elements 111 of different sizes are shown in Figure 6, which shows the gain curves for each radiating structure in Figure 5; and Figure 7, which shows the S-parameter curves for each radiating structure in Figure 5. As shown in Figures 6 and 7, the different units are interconnected. Combining these radiating structures 11 can yield a combined radiating structure 11 with broadband S-parameters and gain.

[0092] In some examples, the log-periodic antenna of the disclosed embodiments has M connection nodes connecting N radiating structures 11 to the feed assembly 12, where M ≥ 3. The spacing between the M connection nodes varies periodically. M can be equal to or different from N, as described below with reference to specific examples.

[0093] Example 1: Referring to FIG5 , in the log-periodic antenna of this example, the connection nodes between each radiating structure 11 and the feeding component 12 are different. In this example, M=5 and N=5 are used as an example. The feeding component 12 includes a first side and a second side arranged opposite to each other, with two radiating structures 11 connected to the first side and three radiating structures 11 connected to the second side. Along the direction away from the feeding port of the feeding component 12, the feed lines 112 of the first to fifth radiating structures 11 are sequentially connected to the feeding component 12 and are staggered on the first and second sides of the feeding component 12. The connection nodes between the feed lines of the first to fifth radiating structures 11 and the feeding component 12 are the first node, the second node, the third node, the fourth node, and the fifth node, respectively; the distance between the first node and the feeding port is the first distance dis1, the distance between the first node and the second node is the second distance dis2, the distance between the second node and the third node is the third distance dis3, the distance between the third node and the fourth node is the fourth distance dis4, and the distance between the fourth node and the fifth node is the fifth distance. The scaling factor t is increased, where dis2 = t*dis1, dis3 = t*dis2, dis4 = t*dis3, and dis5 = t*dis4. Simulations were conducted on two log-periodic antennas, one in which the spacing between the connection nodes of the feed line 112 of the radiating structure 11 and the feeding assembly 12 varies periodically, and the other in which the spacing between the connection nodes of the feed line 112 of the radiating structure 11 and the feeding assembly 12 is equal. The log-periodic antenna in which the spacing between the connection nodes of the feed line 112 of the radiating structure 11 and the feeding assembly 12 varies periodically improves the overall gain by approximately 0.5 dBi, and its S parameters are also relatively good. Furthermore, by designing the spacing between the connection nodes of the feed line 112 of the radiating structure 11 and the feeding assembly 12 to vary periodically, different radiating structures 11 operate at different resonant frequencies, ensuring that the phase of each radiating structure 11 is essentially synchronized when resonating, thereby producing a superposition effect on the composite gain and radiation pattern.

[0094] In addition, the logarithmic periodic antenna using multiple radiating structures 11 has improved S parameters and gain compared to the antenna with a single radiating structure 11, which is equivalent to the combined effect of 5 octagonal units, expanding the bandwidth, improving the gain, and is suitable for use as a broadband antenna. Figure 9 is a gain curve diagram of the logarithmic periodic antenna of the first example of the embodiment of the present disclosure; Figure 10 is an S parameter curve diagram of the logarithmic periodic antenna of the first example of the embodiment of the present disclosure; the simulation results shown in Figures 9 and 10 indicate that in the frequency band of 24.25GHz-29.5GHz, the S parameter has an echo of less than 10dB and the gain is greater than 8.5dB. Continuing to refer to Figure 5, the feed line 112 of each radiating structure 11 extends in a single direction, and the angle with the extension direction of the feeding component 12 is 45°, so the polarization direction of the logarithmic periodic antenna in this example is 45° polarization.

[0095] In some examples, FIG8 is a schematic diagram of a feeding port of a feeding assembly according to an embodiment of the present disclosure. As shown in FIG8 , the feeding assembly 12 includes a first substructure 1211, a second substructure 1212, and a third substructure 1213 connected in sequence. The second substructure 1212 is configured to convert the impedance of the first substructure 1211 to the impedance of the third substructure 1213, with the impedances of the three substructures being represented by Zin, Ztrans, and ZL, respectively. For example, in actual use, the feed impedance of the RF front end is 50 ohms, i.e., Zin = 50 ohms. Depending on the stacked structure, the impedance of the radiating structure 11 may not necessarily be 50 ohms, so impedance matching is required. The impedance ZL of the radiating structure 11 is matched to 50 ohms of Zin through a quarter-wavelength matching section. Since only antenna simulation is currently being performed and the RF front end link is not involved, impedance is not a critical factor. Therefore, ZL = Ztrans = Zin is used in the simulation, while impedance matching adjustment is required in practice.

[0096] In some examples, Figure 11 is a top view of the antenna module of the first example of the embodiment of the present disclosure. As shown in Figure 11, when the above-mentioned log-periodic antenna is applied to the antenna module, the antenna module can include multiple log-periodic antennas. If the antenna module includes a 1*4 log-periodic antenna, the S parameter can be improved to approximately 14dB. Figure 12 is a gain curve of the antenna module of the first example of the embodiment of the present disclosure; Figure 13 is an S parameter curve of the antenna module of the first example of the embodiment of the present disclosure; as shown in Figures 12 and 13.

[0097] Second example: FIG14 is a top view of the log-periodic antenna of the second example of the embodiment of the present disclosure; as shown in FIG14 , the structure of the log-periodic antenna of this example is roughly the same as that of the log-periodic antenna of the first example, except that the extension direction of the feed line 112 of each radiating structure 11 in this log-periodic antenna is perpendicular to the extension direction of the feeding component 12. This structure differs only in the polarization direction of the log-periodic antenna with a 45° polarization direction in the first example, which is the vertical polarization direction. FIG15 is a gain curve diagram of the log-periodic antenna of the second example of the embodiment of the present disclosure; FIG16 is an S-parameter curve diagram of the log-periodic antenna of the second example of the embodiment of the present disclosure.

[0098] In some examples, FIG17 is a top view of the antenna module of the second example of the embodiment of the present disclosure. As shown in FIG17, when the above-mentioned log-periodic antenna is applied to the antenna module, the antenna module can include multiple log-periodic antennas, with the antenna module including a 1*4 log-periodic antenna. Since the feed line 111 in this example is arranged perpendicularly to the feed component 12, while the feed line 111 in the first example is arranged at a 45° angle relative to the feed component 12, the spacing between the log-periodic antennas in this example is significantly larger than that in the first example. It should be noted that the spacing between the log-periodic antennas must not exceed half the wavelength of the center frequency to reduce the risk of generating large side lobes and affecting the composite radiation pattern. FIG18 is a gain curve diagram of the antenna module of the second example of the embodiment of the present disclosure; FIG19 is an S-parameter curve diagram of the antenna module of the second example of the embodiment of the present disclosure. The simulation results are shown in FIG18 and FIG19.

[0099] Third example: Figure 20 is a top view of the log-periodic antenna of the third example of an embodiment of the present disclosure; as shown in Figure 20, the structure of the log-periodic antenna of this example is roughly the same as that of the log-periodic antenna of the second example, with the difference that, in this example, the radiating structure 11 is connected only on one of the first side and the second side of the feeding component 12, while Figure 20 only takes the example of three radiating structures 11 connected to the second side of the feeding component 12. FIG21 is a gain curve diagram of the logarithmic periodic antenna of the third example of the embodiment of the present disclosure (comparison between three radiating structures and five radiating structures); FIG22 is an S parameter curve diagram of the logarithmic periodic antenna of the third example of the embodiment of the present disclosure (comparison between three radiating structures and five radiating structures); As shown in FIG21 and FIG22, in this case, compared with the logarithmic periodic antenna in the second example, both have S parameters below -10dB. In terms of gain, the logarithmic periodic antenna in the second example is not only higher than the logarithmic periodic antenna in this example, but also the gain bandwidth of the logarithmic periodic antenna in the second example is significantly higher. It can be seen that the increase in the number of radiating structures 11 significantly improves the bandwidth. The gain of the antenna with five radiating elements can also reach about 14dBi.

[0100] In some examples, Figure 23 is a top view of the antenna module of the third example of an embodiment of the present disclosure; as shown in Figure 23, when the above-mentioned log-periodic antenna is applied to the antenna module, the antenna module can include multiple log-periodic antennas, and the antenna module includes a 1*4 log-periodic antenna.

[0101] Fourth example: Figure 24 is a top view of a log-periodic antenna of the fourth example of an embodiment of the present disclosure; as shown in Figure 24, the structure of the log-periodic antenna of this example is roughly the same as that of the log-periodic antenna of the first example, with the difference that, in this example, the radiating structure 11 is connected only on one of the first side and the second side of the feeding component 12, while Figure 24 only takes the example of three radiating structures 11 connected to the second side of the feeding component 12.

[0102] Figure 25 is a top view of another antenna according to the fourth example of the present embodiment. As shown in Figure 25, in this antenna structure, the radiating portions 111 of each radiating structure 11 can have the same size. Figure 26 is a top view of yet another antenna according to the fourth example of the present embodiment. Figure 26 uses only five radiating structures 11 connected to the second side of the feed assembly 12 as an example. Comparing a log-periodic antenna having three radiating structures 11 and a log-periodic antenna having five radiating structures 11, Figure 27 shows the gain curves of the antennas shown in Figures 25 and 26 according to the present embodiment. Figure 28 shows the S-parameter curves of the antennas shown in Figures 25 and 26 according to the present embodiment. Figures 27 and 28 show that the log-periodic antenna with five radiating structures 11 maintains stable gain across a very wide frequency band. It should be noted that even if the radiating portions 111 of each radiating structure 11 are of equal size, the gain bandwidth of the antenna with a greater number of radiating structures 11 is significantly improved.

[0103] In some examples, Figure 29 is a top view of the antenna module of the fourth example of the embodiment of the present disclosure; Figure 30 is a gain curve diagram of the antenna module of the fourth example of the embodiment of the present disclosure; Figure 31 is an S parameter curve diagram of the antenna module of the fourth example of the embodiment of the present disclosure; as shown in Figure 29, when the above-mentioned log-periodic antenna is applied to the antenna module, the antenna module can include multiple log-periodic antennas, and the antenna module includes a 1*4 log-periodic antenna. The simulation results are shown in Figures 30 and 31.

[0104] Fifth example: Figure 32 is a top view of the logarithmic periodic antenna of the fifth example of the embodiment of the present disclosure; as shown in Figure 32, in the logarithmic periodic antenna of this example, the first and second sides of the feed component 12 are connected to the radiating structure 11, and the radiating structures 11 connected to the first and second sides of the feed line 112 component are arranged in a one-to-one correspondence, and the connection node of the corresponding radiating structure 11 and the feed component 12 is the same connection node. In Figure 33, N=6 and M=3 are taken as an example. In this example, the extension direction of the feed line 112 of the radiating structure 11 is a single direction and is perpendicular to the extension direction of the feed component 12. Figure 33 is a top view of the logarithmic periodic antenna of the fifth example of the embodiment of the present disclosure; Figure 34 is a gain curve diagram of the logarithmic periodic antenna of the fifth example of the embodiment of the present disclosure; as shown in Figures 33 and 34, it can be seen from the simulation that the S parameter substrate of this logarithmic periodic antenna is below -10dB and the gain is around 7dBi.

[0105] Sixth Example: Figure 35 is a top view of a log-periodic antenna according to the sixth example of the present disclosure. As shown in Figure 35 , the log-periodic antenna in this example has a substantially identical structure to the fifth example, differing only in that the feed line 112 of the radiating structure 11 includes a first feed line 112 and a second sub-feed line 1122, and the first sub-feed line 1121 and the second sub-feed line 1122 extend in different directions. The first end of the first sub-feed line 1121 is connected to the feed assembly 12, the second end of the first sub-feed line 1121 is connected to the first end of the second sub-feed line 1122, and the second end of the second sub-feed line 1122 is connected to the radiating portion 111. It can be seen that the polarization direction of the log-periodic antenna in this example is the same as that in the fifth example. Specifically, if the extension direction of the first sub-feed line 1121 is perpendicular to the extension direction of the feed assembly 12, and the extension direction of the second sub-feed line 1122 is parallel to the extension direction of the feed assembly 12, the polarization direction of the log-periodic antenna is horizontal. Figure 36 shows a gain curve for the sixth example log-periodic antenna according to the present disclosure, and Figure 37 shows the S-parameters for the sixth example log-periodic antenna according to the present disclosure. As shown in Figures 36 and 37, simulations show that the S-parameters for this log-periodic antenna are below -10 dB, and the gain is approximately 7 dBi.

[0106] Seventh example: FIG38 is a top view of a log-periodic antenna of the seventh example of an embodiment of the present disclosure; as shown in FIG38 , in the log-periodic antenna of this example, the radiation structure 11 is connected only to the second side of the feeding component 12. In which, every two adjacent radiating structures 11 form a group. For a group of radiating structures 11, the feed line 112 of each radiating structure 11 includes a first sub-feeder 1121 and a second sub-feeder 1122, and the extension directions of the first sub-feeder 1121 and the second sub-feeder 1122 are different; the first end of the first sub-feeder 1121 is connected to the feeding assembly 12, the second end of the first sub-feeder 1121 is connected to the first end of the second sub-feeder 1122, and the second end of the second sub-feeder 1122 is connected to the radiating portion 111; the first sub-feeder 1121 of the two radiating structures 11 is shared, and the second sub-feeders 1122 of the two radiating structures 11 are symmetrically arranged with the extension direction of the first feeder 112 as the symmetry axis, and the radiating portions 111 of the two radiating structures 11 have the same size; the radiating portions 111 of each group of radiating structures 11 decrease in size along the direction away from the feeding end of the feeding assembly 12, and satisfy a periodic variation. The length of the first sub-feeder 1121 of each group of radiation structures 11 increases gradually along the direction away from the feeding end of the feeding component 12 .

[0107] FIG39 is a top view of another log-periodic antenna according to the seventh example of the present disclosure. As shown in FIG39 , the lengths of the first sub-feeders 1121 of each group of radiating structures 11 in a direction away from the feeding end of the feeding assembly 12 may also be equal. FIG40 is a top view of the log-periodic antenna shown in FIG41 according to the present disclosure. FIG41 is a gain curve diagram of the log-periodic antenna shown in FIG41 according to the present disclosure. As shown in FIG40 and FIG41 , simulations show that the S-parameter substrate of this log-periodic antenna is below -10 dB, and the gain is approximately 7 dBi.

[0108] In some examples, the antenna module provided by the embodiments of the present disclosure also includes a transceiver unit, a radio frequency transceiver, a signal amplifier, a power amplifier, and a filtering unit. The log-periodic antenna in the antenna module can be used as a transmitting antenna or as a receiving antenna. Among them, the transceiver unit may include a baseband and a receiving end. The baseband provides a signal of at least one frequency band, such as a 2G signal, a 3G signal, a 4G signal, a 5G signal, etc., and sends a signal of at least one frequency band to the radio frequency transceiver. After the log-periodic antenna in the antenna system receives the signal, it can be processed by the filtering unit, the power amplifier, the signal amplifier, and the radio frequency transceiver and then transmitted to the receiving end in the initial unit. The receiving end can be, for example, a smart gateway.

[0109] Furthermore, a radio frequency transceiver is connected to the transceiver unit and is used to modulate the signals sent by the transceiver unit, or to demodulate the signals received by the transparent antenna and transmit them back to the transceiver unit. Specifically, the radio frequency transceiver may include a transmitting circuit, a receiving circuit, a modulation circuit, and a demodulation circuit. After the transmitting circuit receives various types of signals provided by the substrate, the modulation circuit can modulate the various types of signals provided by the baseband and then transmit them to the antenna. The transparent antenna receives the signal and transmits it to the receiving circuit of the radio frequency transceiver. The receiving circuit transmits the signal to the demodulation circuit, which demodulates the signal and transmits it to the receiving end.

[0110] Furthermore, the RF transceiver is connected to a signal amplifier and a power amplifier, which are then connected to a filtering unit, which is connected to at least one log-periodic antenna. When the antenna system transmits signals, the signal amplifier is used to increase the signal-to-noise ratio of the signal output by the RF transceiver before transmitting it to the filtering unit. The power amplifier is used to amplify the power of the signal output by the RF transceiver before transmitting it to the filtering unit. The filtering unit may specifically include a duplexer and a filtering circuit. The filtering unit combines the signals output by the signal amplifier and the power amplifier, filters out noise, and then transmits them to the log-periodic antenna, which radiates the signal. When the antenna system receives signals, the log-periodic antenna receives the signal and transmits it to the filtering unit. The filtering unit filters out noise from the signal received by the antenna and transmits it to the signal amplifier and power amplifier. The signal amplifier amplifies the signal received by the antenna to increase the signal-to-noise ratio. The power amplifier amplifies the power of the signal received by the log-periodic antenna. The signal received by the log-periodic antenna is processed by the power amplifier and signal amplifier before being transmitted to the RF transceiver, which then transmits it to the transceiver unit.

[0111] In some examples, the signal amplifier may include various types of signal amplifiers, such as a low noise amplifier, which is not limited herein.

[0112] In some examples, the antenna module provided by the embodiments of the present disclosure further includes a power management unit, which is connected to a power amplifier to provide the power amplifier with a voltage for amplifying the signal.

[0113] In some examples, the display device can be any product with a display function, such as a mobile phone, a tablet computer, a television, a monitor, a laptop computer, a digital photo frame, an in-vehicle device, etc. Other essential components of the display device 200 are well understood by those skilled in the art and are not described in detail here, nor should they be construed as limitations of the present disclosure.

[0114] It will be understood that the above embodiments are merely exemplary embodiments for illustrating the principles of the present invention, and the present invention is not limited thereto. Those skilled in the art will appreciate that various modifications and improvements can be made without departing from the spirit and substance of the present invention, and such modifications and improvements are also considered to be within the scope of protection of the present invention.

Claims

1. A log-periodic antenna, comprising a feeding assembly and N radiating structures; each of the radiating structures is electrically connected to the feeding assembly, and the number of connection nodes is M; N ≥ 3, M ≥ 3; wherein, The distances between the M connection nodes satisfy periodic variation.

2. The log-periodic antenna according to claim 1, wherein: The radiation structure comprises a radiation part and a feeder line, wherein the radiation part has a notch, one end of the feeder line is located in the notch and electrically connected to the radiation part, and the other end of the feeder line is electrically connected to the feeding component.

3. The log-periodic antenna according to claim 2, wherein: The notch has a first side electrically connected to the feeder, and a second side and a third side connected to both ends of the first side. The second side and the third side are both in the same extension direction as the feeder and are arranged perpendicular to the first side.

4. The log-periodic antenna according to claim 2, wherein: The outline of the radiation portion is substantially a regular octagon.

5. The log-periodic antenna according to any one of claims 1 to 4, wherein: The feeding component has a first side and a second side that are arranged opposite to each other, and the radiation structure is connected to both the first side and the second side of the feeding component.

6. The log-periodic antenna according to claim 5, wherein: The radiating structure comprises a radiating portion and a feeder line, wherein the radiating portion is electrically connected to the feeding assembly through the feeder line; The connection nodes between each of the radiation structures and the feeding structure are different, and the radiation portion of each of the radiation structures decreases in size along a direction away from the feeding end of the feeding component and satisfies periodic variation.

7. The log-periodic antenna according to claim 5, wherein: The radiating structures connected to the first side and the second side of the feeding assembly are arranged in a one-to-one correspondence, and the connection nodes of the correspondingly arranged radiating structures and the feeding assembly are the same node; the radiating structure includes a radiating portion and a feeder, and the radiating portion is electrically connected to the feeding assembly through the feeder; The radiating parts of the corresponding radiating structures have the same size; the radiating parts of the radiating structures connected to the first side of the feeding component have a size that decreases in the direction away from the feeding end of the feeding component and satisfies a periodic change; the radiating parts of the radiating structures connected to the second side of the feeding component have a size that decreases in the direction away from the feeding end of the feeding component and satisfies a periodic change.

8. The log-periodic antenna according to claim 7, wherein: The feed line has a single extension direction and intersects with the extension direction of the feeding assembly.

9. The log-periodic antenna according to claim 7, wherein: The feeder includes a first sub-feeder and a second sub-feeder, and the first sub-feeder and the second sub-feeder have different extension directions; the first end of the first sub-feeder is connected to the feeding assembly, the second end of the first sub-feeder is connected to the first end of the second sub-feeder, and the second end of the second sub-feeder is connected to the radiating part.

10. The log-periodic antenna according to claim 1, wherein: The feeding assembly has a first side and a second side that are arranged opposite to each other, and each of the radiating structures is connected to the first side or the second side of the feeding assembly.

11. The log-periodic antenna according to claim 10, wherein: The radiating structure comprises a radiating portion and a feeder line, wherein the radiating portion is electrically connected to the feeding assembly through the feeder line; The connection nodes between each of the radiation structures and the feeding structure are different, and the radiation portion of each of the radiation structures decreases in size along a direction away from the feeding end of the feeding component and satisfies periodic variation.

12. The log-periodic antenna according to claim 10, wherein: The radiating structure comprises a radiating portion and a feeder line, wherein the radiating portion is electrically connected to the feeding assembly through the feeder line; Every two adjacent radiation structures form a group. For a group of radiation structures, each radiation structure feeder includes a first sub-feeder and a second sub-feeder, and the first sub-feeder and the second sub-feeder have different extension directions; the first end of the first sub-feeder is connected to the feeding assembly, the second end of the first sub-feeder is connected to the first end of the second sub-feeder, and the second end of the second sub-feeder is connected to the radiation part; the first sub-feeder of the two radiation structures is shared, and the second sub-feeders of the two radiation structures are symmetrically arranged with the extension direction of the first feeder as the symmetry axis, and the radiation parts of the two radiation structures have the same size; The size of the radiating portion of each group of the radiating structures decreases gradually along a direction away from the feeding end of the feeding assembly and satisfies a periodic variation.

13. The log-periodic antenna according to claim 12, wherein: The length of the first sub-feeder of each group of the radiation structure increases gradually along the direction away from the feeding end of the feeding assembly.

14. The log-periodic antenna according to claim 1, wherein: The feeding port of the feeding component includes a first substructure, a second substructure and a third substructure connected in sequence; the second substructure is configured to configure the impedance of the first substructure to the impedance of the third substructure.

15. A display device, comprising a display module and an antenna module arranged on the light-emitting surface side of the display module; the antenna module comprises at least one log-periodic antenna as described in any one of claims 1 to 14.

16. The display device according to claim 15, wherein: The antenna module includes a radiation layer; the radiation layer is a metal grid structure, and the log-periodic antenna is located in the radiation layer.

17. The display device according to claim 16, wherein: The radiation layer also includes a redundant radiation structure.

18. The display device according to claim 15, wherein: It also includes a polarizer, and the antenna module is arranged on a side of the polarizer close to the display module.

19. The display device according to claim 15, wherein: It also includes a touch module, which is located between the display module and the antenna module.

20. The display device according to claim 15, wherein: The display module is an organic light emitting diode display module.

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