Feed antenna and electronic device

Abstract

The utility model relates to a feed antenna and electronic equipment, the feed antenna comprises a main branch, a parasitic branch and a floor, the main branch is provided with a feed branch, the feed branch is connected with the floor, the parasitic branch is provided with a grounding branch, the grounding branch is connected with the floor, and the main branch and the parasitic branch are at least partially overlapped. According to the feed antenna, the electromagnetic wave absorption ratio of the front end facing the user to the rear end back to the user is low, and the degree of harm to the user is smaller.

Description

Technical Field

[0001] The present application relates to the field of antenna technology, and in particular to a feeding antenna and electronic equipment. Background Art

[0002] When an antenna transmits a signal, human tissue absorbs electromagnetic wave energy. The specific absorption rate (SAR) can be used to measure the electromagnetic power absorbed or consumed by a unit mass of human tissue. The higher the SAR value, the greater the degree of harm to the human body. Common 2.4G and 5G antenna solutions currently used in products include a combination of a parasitic antenna and an inverted F antenna (IFA), a combination of a left-handed antenna and a parasitic antenna, and a slot antenna. These solutions are used to meet the specific absorption rate (SAR) regulatory standards of different regions. Currently, the commonly used methods for reducing SAR values ​​mainly involve adding absorbing / shielding materials or using power backoff devices, but these methods increase production costs, take up more space, and reduce antenna radiation performance, affecting the user experience of using electronic devices. Utility Model Content

[0003] The present application provides a feeding antenna and an electronic device, which reduce the SAR value while meeting the antenna radiation performance, thereby reducing the harmfulness of the antenna radiation to the user.

[0004] A first aspect of the present application provides a feeding antenna, which includes a main branch, a parasitic branch and a floor. The main branch is provided with a feeding branch, which is connected to the floor. The parasitic branch is provided with a grounding branch, which is connected to the floor. The main branch and the parasitic branch at least partially overlap.

[0005] In one possible design, in the length direction of the main branch, the main branch includes a first end and a second end, the feeding branch is located between the first end and the second end, the part of the main branch located between the first end and the feeding branch is formed as a first part, and the part of the main branch located between the second end and the feeding branch is formed as a second part, and the length of the first part is different from the length of the second part.

[0006] The main branch is divided into a first part and a second part using the central axis a of the feed branch as the dividing line. Since the length of the first part is different from that of the second part, the coupling length between the first part and the parasitic branch is different from the coupling length between the second part and the parasitic branch, that is, the main branch asymmetrically couples and feeds the parasitic branch. When the feed antenna of the present application is used to transmit 5G signals, the excited mode is the 1λC mode, that is, a common mode is formed. When the feed antenna of the present application is used to transmit 2.4G signals, the excited mode is the λ / 2D mode, that is, a differential mode is formed, and the current flows in opposite directions on the parasitic branch. By normalizing the total radiated power (TRP) of the 2.4G signal to 15.5 decibel milliwatts (dBm) and the TRP of the 5G signal to 14.5dBm, the SAR simulation test was performed on the feed antenna of the present application. The SAR values ​​of the feed antenna of the present application for transmitting 2.4G signals and 5G signals were significantly reduced, especially the SAR value of the front end facing the user and the SAR value of the back end facing the user in the feed antenna were reduced, and the degree of harm to the human body was reduced. Taking the 0mm 1-gSAR test item as an example, from the maximum value of SAR, the TRP gain of the feed antenna of the present application for transmitting 2.4G signals can be above 5 decibels (dB), and the TRP gain of the feed antenna of the present application for transmitting 5G signals can be above 2dB, and the signal transmission quality is higher. The efficiency of the feed antenna of the present application in transmitting 2.4G signals is -0.7dB, and the efficiency of the feed antenna of the present application in transmitting 5G signals is -0.1dB. The feed antenna of the present application can generate two resonances when transmitting 5G signals, and the signal transmission efficiency is high.

[0007] In one possible design, the parasitic branch includes a first parasitic branch and a second parasitic branch, with a first spacing space between the first parasitic branch and the second parasitic branch. When the feed antenna of the present application is used to transmit 5G signals, two current zero points exist on the first parasitic branch and the second parasitic branch, respectively, and the antenna has higher radiation efficiency.

[0008] In a possible design, the first portion overlaps with at least a portion of the parasitic branch, and the second portion overlaps with at least another portion of the parasitic branch.

[0009] In one possible design, both the main and parasitic branches are perpendicular to the floor. This creates a three-dimensional structure for the feed antenna, allowing it to be away from interfering devices like batteries and circuits. This provides a clear space for the feed antenna, known as clearance, ensuring omnidirectional communication.

[0010] In one possible design, the parasitic branch is located between the main branch and the floor.

[0011] In one possible design, the main branch is located between the parasitic branch and the floor.

[0012] In one possible design, two main branches are provided, one on each side of the parasitic branch. The two ends of the feed branch are connected to the two main branches, and the feed branch is connected to the floor between the two ends. The two main branches are coupled with the parasitic branch, further reducing the SAR value at the front and back ends of the feed antenna, and coupling and transmitting signals with double the efficiency, making the feed antenna more efficient in radiation.

[0013] In a possible design, both the main branch and the parasitic branch are metal plates, which have a stable structure and high reliability.

[0014] In one possible design, the feed antenna also includes a dielectric plate, and the parasitic branches and main branches are both flexible printed circuit boards, to which the parasitic branches and main branches are attached. These flexible printed circuit boards can be attached to curved or complex surfaces within electronic devices, fully utilizing the internal space of the electronic device and contributing to its lightweight, thinness, or miniaturization.

[0015] In one possible design, the main branches, parasitic branches, and the floor are coplanar, which is conducive to the lightweight and thinning of electronic devices.

[0016] In a possible design, a second spacing space is provided between the main branch and the parasitic branch, and the main branch indirectly couples and feeds the parasitic branch.

[0017] A second aspect of the present application provides an electronic device, which includes the above-mentioned feeding antenna and has the above-mentioned effects.

[0018] It should be understood that the foregoing general description and the following detailed description are merely illustrative and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic structural diagram of the feeding antenna provided in this application in a first specific embodiment;

[0020] Figure 2 for Figure 1 Schematic diagram of the structure of the center-fed antenna from another perspective;

[0021] Figure 3 for Figure 1 Return loss-frequency plot for a mid-feed antenna;

[0022] Figure 4 This is a schematic structural diagram of a second specific embodiment of the feed antenna provided in this application;

[0023] Figure 5 for Figure 4 Schematic diagram of the structure of the center-fed antenna from another perspective;

[0024] Figure 6 This is a schematic structural diagram of the third specific embodiment of the feed antenna provided in this application;

[0025] Figure 7 for Figure 6 Schematic diagram of the structure of the center-fed antenna from another perspective;

[0026] Figure 8 A schematic structural diagram of a fourth specific embodiment of the feed antenna provided in this application;

[0027] Figure 9 for Figure 8 Schematic diagram of the structure of the center-fed antenna from another perspective;

[0028] Figure 10 This is a schematic structural diagram of a fifth specific embodiment of the feed antenna provided in this application;

[0029] Figure 11 for Figure 10 Schematic diagram of the structure of the center-fed antenna from another perspective;

[0030] Figure 12 A schematic structural diagram of a sixth specific embodiment of the feed antenna provided in this application;

[0031] Figure 13 for Figure 12 Schematic diagram of the structure of the center-fed antenna from another perspective;

[0032] Figure 14 A schematic structural diagram of a seventh specific embodiment of the feed antenna provided in this application;

[0033] Figure 15 for Figure 14 Schematic diagram of the structure of the center-fed antenna from another perspective;

[0034] Figure 16 for Figure 15 A schematic diagram of the structure of a mid-feed antenna, wherein the floor is not shown;

[0035] Figure 17 This is a schematic structural diagram of an eighth specific embodiment of the feed antenna provided by the present application, wherein the floor is not shown;

[0036] Figure 18 This is a schematic structural diagram of a ninth specific embodiment of the feed antenna provided in this application;

[0037] Figure 19 for Figure 19 Schematic diagram of the structure of the center-fed antenna from another perspective;

[0038] Figure 20This is a schematic structural diagram of a tenth specific embodiment of the feeding antenna provided in this application;

[0039] Figure 21 This is a schematic structural diagram of the eleventh specific embodiment of the feeding antenna provided in this application;

[0040] Figure 22 This is a schematic structural diagram of the feeding antenna provided in this application in the twelfth specific embodiment.

[0041] Reference numerals:

[0042] 1-main branch;

[0043] 11-feeding branch;

[0044] 12-first end;

[0045] 13- second end;

[0046] 14-Part I;

[0047] 15-Part II;

[0048] 2-parasitic branches;

[0049] 21- grounding branches;

[0050] 22-first parasitic branch;

[0051] 23-second parasitic branch;

[0052] 24- first interval space;

[0053] 3- Floor;

[0054] 4- dielectric plate;

[0055] 5- Second compartment;

[0056] Central axis a.

[0057] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application. DETAILED DESCRIPTION

[0058] In order to better understand the technical solution of the present application, the embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0059] In the description of this application, unless otherwise specified or limited, the terms "first" and "second" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance; unless otherwise specified or explained, the term "plurality" refers to two or more; the terms "connected" and "fixed" should be understood in a broad sense. For example, "connected" can mean a fixed connection, a detachable connection, an integral connection, or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For those skilled in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0060] The technical solutions provided in the embodiments of the present application are applicable to electronic devices that adopt one or more of the following communication technologies: Bluetooth (BT) communication technology, global positioning system (GPS) communication technology, wireless fidelity (WiFi) communication technology, global system for mobile communications (GSM) communication technology, wideband code division multiple access (WCDMA) communication technology, long term evolution (LTE) communication technology, 5G communication technology and other future communication technologies. The electronic devices in the embodiments of the present application can be mobile phones, tablet computers, laptop computers, smart homes, smart bracelets, smart watches, smart helmets, smart glasses, etc. The electronic devices can also be handheld devices with wireless communication functions, computing devices or other processing devices connected to wireless modems, vehicle-mounted devices, electronic devices in 5G networks or electronic devices in future evolved public land mobile networks (PLMN), etc., and the embodiments of the present application are not limited to this.

[0061] The electronic device includes a feed antenna. The feed antenna has a lower SAR value than a combination of a closed-loop antenna and a parasitic antenna in the prior art, and also lower SAR value than a slot antenna, thus being less harmful to users.

[0062] Among them, the end of the antenna facing the user is the front end, and the end of the antenna away from the user is the rear end. The SAR values ​​of the front end and rear end of the antenna in the prior art are relatively high, which is more harmful to the user. Therefore, the electronic device and feed antenna of the present application are intended to reduce the SAR values ​​of the front end and rear end of the antenna, reducing the harmfulness of the antenna to the human body.

[0063] Table 1 shows a simulation test table of SAR values ​​for a closed-loop antenna and parasitic antenna combination in the prior art, and Table 2 shows a simulation test table of SAR values ​​for a slot antenna in the prior art. In both Tables 1 and 2, 0mm 1-g represents the SAR value absorbed per 1g of biological tissue at a distance of 0mm from the test antenna, and 0mm 10-g represents the SAR value absorbed per 10g of biological tissue at a distance of 0mm from the test antenna.

[0064] Table 1 SAR value simulation test table of closed-loop antenna and parasitic antenna combination

[0065]

[0066] Table 2 Slot antenna SAR value simulation test table

[0067]

[0068] Please refer to Figure 1-Figure 2 、 Figure 4-Figure 22 As shown, the feeding antenna of the present application includes a main branch 1, a parasitic branch 2 and a floor 3. The main branch 1 is provided with a feeding branch 11, which is connected to the floor 3. The parasitic branch 2 is provided with a grounding branch 21, which is connected to the floor 3. The main branch 1 and the parasitic branch 2 at least partially overlap.

[0069] In this embodiment, the feeding branch 11 can transmit current to the main branch 1, the main branch 1 and the parasitic branch 2 at least partially overlap, and the main branch 1 and the parasitic branch 2 can be coupled, that is, the main branch 1 can transmit current to the parasitic branch 2 to realize the signal transmission function.

[0070] The coupling may be indirect coupling (there is no physical contact between the main branch 1 and the parasitic branch 2, i.e., conduction through air) or direct coupling (the main branch 1 and the parasitic branch 2 are in physical contact and conduct electricity).

[0071] The floor 3 may generally refer to at least a portion of any grounding layer, grounding plate, or grounding metal layer in an electronic device (such as a mobile phone), or at least a portion of any combination of any of the above grounding layers, grounding plates, or grounding components. The "ground / floor" may be used for grounding components in the electronic device. In one embodiment, the "ground / floor" may be the grounding layer of the circuit board of the electronic device, or the grounding plate formed by the middle frame of the electronic device, or the grounding metal layer formed by the metal film under the screen. In one embodiment, the circuit board may be a printed circuit board (PCB), such as an 8-layer, 10-layer, or 12-14-layer board having 8, 10, 12, 13, or 14 layers of conductive material, or an element separated and electrically insulated by a dielectric layer or insulating layer such as fiberglass, polymer, or the like. In one embodiment, the circuit board includes a dielectric substrate, a grounding layer, and a routing layer, and the routing layer and the grounding layer are electrically connected through vias. In one embodiment, components such as a display, touch screen, input buttons, transmitter, processor, memory, battery, charging circuit, and system-on-chip (SoC) structures can be mounted on or connected to a circuit board, or electrically connected to a trace layer and / or ground layer in the circuit board. For example, a radio frequency source can be located on a trace layer.

[0072] Any of the above-mentioned grounding layers, grounding plates, or grounding metal layers are made of a conductive material. In one embodiment, the conductive material can be any of the following: copper, aluminum, stainless steel, brass, and alloys thereof, copper foil on an insulating substrate, aluminum foil on an insulating substrate, gold foil on an insulating substrate, silver-plated copper, silver-plated copper foil on an insulating substrate, silver foil and tin-plated copper on an insulating substrate, cloth impregnated with graphite powder, a graphite-coated substrate, a copper-plated substrate, a brass-plated substrate, and an aluminum-plated substrate. Those skilled in the art will appreciate that the grounding layer / grounding plate / grounding metal layer can also be made of other conductive materials.

[0073] For details, please refer to Figure 1 、 Figure 4 、 Figure 9 、 Figure 11 、 Figure 14 、 Figure 18 、 Figure 20-22 As shown, there is a second space 5 between the main branch 1 and the parasitic branch 2, that is, indirect coupling is used to transfer current from the main branch 1 to the parasitic branch 2. The following description of the main branch 1 and the parasitic branch 2 is based on indirect coupling as an example.

[0074] For details, please refer to Figure 1-Figure 2 、 Figure 4-Figure 22As shown, along the length direction of the main branch node 1, the main branch node 1 includes a first end 12 and a second end 13, the feeding branch node 11 is located between the first end 12 and the second end 13, the part of the main branch node 1 located between the first end 12 and the feeding branch node 11 is formed as a first part 14, and the part of the main branch node 1 located between the second end 13 and the feeding branch node 11 is formed as a second part 15, and the length of the first part 14 is different from the length of the second part 15.

[0075] In this embodiment, the central axis a of the feeding branch 11 is used as the dividing line to divide the main branch 1 into a first part 14 and a second part 15. Since the length of the first part 14 is different from that of the second part 15, the coupling length between the first part 14 and the parasitic branch 2 is different from the coupling length between the second part 15 and the parasitic branch 2. That is, the main branch 1 can perform asymmetric coupling feeding on the parasitic branch 2. When the feeding antenna of the present application is used to transmit 5G signals, the excited mode is the 1λC mode, that is, a common mode is formed, and the current flows in the same direction on the main branch 1. When the feeding antenna of the present application is used to transmit 2.4G signals, the excited mode is the λ / 2D mode, that is, a differential mode is formed, and the current flows in the opposite direction on the parasitic branch 2. By normalizing the total radiated power (TRP) of the 2.4G signal to 15.5 decibel milliwatts (dBm) and the TRP of the 5G signal to 14.5dBm, the SAR value simulation test was performed on the feeding antenna of the present application, and the test results are shown in Table 3. Compared with the SAR values ​​in Table 1 and Table 2 in the prior art, the SAR values ​​of the feeding antenna of the present application for transmitting 2.4G signals and 5G signals are significantly reduced, especially the SAR value of the front end and the SAR value of the rear end of the feeding antenna are reduced, and the degree of harm to the human body is reduced. Taking the test item of 0mm 1-gSAR in Table 3 as an example, from the maximum SAR value, the gain of the feeding antenna of the present application for transmitting 2.4G signals can be above 5 decibels (dB), and the gain of the feeding antenna of the present application for transmitting 5G signals can be above 2dB, and the signal transmission quality is higher. As Figure 3 As shown, the efficiency of the feed antenna of the present application in transmitting 2.4G signals is -0.7dB, and the efficiency of the feed antenna of the present application in transmitting 5G signals is -0.1dB. The feed antenna of the present application can generate two resonances when transmitting 5G signals, and the signal transmission efficiency is high.

[0076] Table 3

[0077]

[0078] The current distribution in the same or opposite direction mentioned in the embodiments of this application should be understood as the direction of the main current on the conductor on the same side being in the same or opposite direction. For example, when stimulating a current distributed in the same direction on a ring-shaped conductor (e.g., the current path is also ring-shaped), it should be understood that the main currents stimulated on the conductors on both sides of the ring conductor (e.g., the conductors surrounding a gap, on the conductors on both sides of the gap), although the main currents stimulated in the conductors on both sides of the ring conductor (e.g., the conductors on both sides of the gap), although they are in opposite directions, still fall within the definition of unidirectional distributed current in this application.

[0079] More specifically, please refer to Figure 1-Figure 2 、 Figure 4-Figure 20 As shown, the first portion 14 overlaps with at least a portion of the parasitic stub 2, and the second portion 15 overlaps with at least another portion of the parasitic stub 2, so that the first portion 14 and the second portion 15 are coupled to different portions of the parasitic stub 2 for feeding.

[0080] Please refer to Figure 1-Figure 2 、 Figure 11-Figure 21 As shown, the parasitic branch 2 includes a first parasitic branch 22 and a second parasitic branch 23 , and a first spacing space 24 is formed between the first parasitic branch 22 and the second parasitic branch 23 .

[0081] In this embodiment, the parasitic branch 2 is disconnected and divided into a first parasitic branch 22 and a second parasitic branch 23. When the feeding antenna of the present application is used to transmit 5G signals, there are two current zero points on the first parasitic branch 22 and the second parasitic branch 23, respectively, and the radiation efficiency of the antenna is higher.

[0082] Of course, the parasitic branch 2 can also be a whole, such as Figure 4-Figure 9 The parasitic branch 2 can be designed as a disconnected structure or an integral structure according to the SAR value standards of different regions and different antenna radiation performance requirements.

[0083] Please refer to Figures 8-13 As shown, the main branch 1 and the parasitic branch 2 can both be perpendicular to the floor 3.

[0084] In this embodiment, the feeding antenna is a three-dimensional structure, which can keep the feeding antenna away from batteries or other devices with electromagnetic interference, leaving a clean space (clearance) for the feeding antenna and ensuring the omnidirectional communication effect of the feeding antenna.

[0085] Of course, the feeding antenna of the present application can also only have the parasitic branch 2 perpendicular to the floor 3, so that the main branch 1 is located at the end of the parasitic branch 2 away from the floor 3, such as Figure 1-Figure 2 shown.

[0086] In the above embodiment, please refer to Figures 8-11 As shown, the main branch 1 can be located between the parasitic branch 2 and the floor 3, please refer to Figure 12-13As shown, the parasitic branch 2 can be located between the main branch 1 and the floor 3. The positional relationship between the main branch 1, the parasitic branch 2 and the floor 3 can be appropriately adjusted according to the actual internal space of the electronic device.

[0087] Please refer to Figure 14-17 As shown, two main branches 1 can be provided, and the two main branches 1 are respectively located on both sides of the parasitic branch 2 , and the two ends of the feeding branch 11 are respectively connected to the two main branches 1 , and the part of the feeding branch 11 between its two ends is connected to the floor 3 .

[0088] In this embodiment, the two main branches 1 are coupled to both sides of the parasitic branch 2, achieving double the efficiency of signal transmission. When both main branches 1 are asymmetrically coupled and fed relative to the parasitic branch 2, the SAR values ​​at the front and back ends of the feeding antenna are further reduced, minimizing the risk to users.

[0089] In the above embodiment, please refer to Figure 1-Figure 2 、 Figure 4-Figure 5 、 Figures 8-17 As shown, the main branch 1 and the parasitic branch 2 can both be metal plates, which have strong structural stability and high reliability.

[0090] In the above embodiment, please refer to Figure 6-Figure 7 、 Figures 17-22 As shown, the feeding antenna further includes a dielectric plate 4 , and the parasitic branch 2 and the main branch 1 can both be flexible circuit boards, and the parasitic branch 2 and the main branch 1 are attached to the dielectric plate 4 .

[0091] In this embodiment, the parasitic branch 2 and the main branch 1 are flexible circuit boards that can be attached to the curved or complex structural surface inside the electronic device, making full use of the internal space of the electronic device, which is conducive to the lightweight or miniaturization of the electronic device and improving the user experience. The dielectric board 4 serves as the supporting substrate of the flexible circuit board. The dielectric board can be a flame-resistant material (FR-4) dielectric board, a Rogers dielectric board, a mixed dielectric board of Rogers and FR-4, and so on. Here, FR-4 is a code for a grade of flame-resistant material, and the Rogers dielectric board is a high-frequency board.

[0092] In the above embodiment, please refer to Figure 20-22 As shown, the main branch 1, the parasitic branch 2 and the floor 3 can be coplanar, which is conducive to the lightweight and thinning of electronic equipment and improves the user experience.

[0093] In the above content, the test results are shown in Table 3. The specific structure of the feed antenna is as follows: Figure 1-Figure 2As shown, the parasitic branch 2 is a disconnected first parasitic branch 22 and a second parasitic branch 23, the main branch 1 and the parasitic branch 2 are both metal plates, the parasitic branch 2 is perpendicular to the floor 3, the main branch 1 is located at the end of the parasitic branch 2 away from the floor 3, and there is a second spacing space 5 between the main branch 1 and the parasitic branch 2.

[0094] Of course, corresponding tests are also performed on other embodiments of the feed antenna of the present application. Similarly, the TRP of the 2.4G signal is normalized to 15.5dBm and the TRP of the 5G signal is normalized to 14.5dBm. The specific test results of each embodiment are described below.

[0095] For example Figure 14-16 Tests were conducted on a feed antenna embodiment in which two main branches 1 were used, and both main branches 1 and parasitic branches 2 were metal plates. Table 4 shows the test results of the front-end and back-end SAR values ​​for this embodiment when transmitting 2.4 GHz and 5 GHz signals, respectively. Taking 0 mm 1 g SAR as an example, the maximum SAR value indicates that the gain for the 2.4 GHz signal is at least 5 dB, and the gain for the 5 GHz signal is at least 6 dB.

[0096] Table 4

[0097]

[0098] For example Figure 4-Figure 5 The parasitic branch 2 is shown as a single unit, and both the main branch 1 and the parasitic branch 2 are metal plate feed antennas for testing. The test results for the front-end and back-end SAR values ​​of this embodiment, transmitting 2.4 GHz and 5 GHz signals, respectively, are shown in Table 5. Taking 0 mm 1 g SAR as an example, the maximum SAR value indicates that the gain of the 2.4 GHz signal is at least 5 dB, and the gain of the 5 GHz signal is at least 2 dB.

[0099] Table 5

[0100]

[0101] For example Figure 10-11 The feed antenna shown in the figure was tested, with main branch 1 located between parasitic branch 2 and floor 3, both main branch 1 and parasitic branch 2 perpendicular to floor 3, and parasitic branch 2 consisting of disconnected first parasitic branch 22 and second parasitic branch 23. The test results of the front-end and back-end SAR values ​​of this embodiment when transmitting 2.4 GHz and 5 GHz signals, respectively, are shown in Table 6. Taking 0 mm 1-g SAR as an example, the maximum SAR value shows that the gain of both 2.4 GHz and 5 GHz signals is 1.5 dB.

[0102] Table 6

[0103]

[0104] For example Figure 20 The feed antenna shown in the figure was tested, where the main branch 1, parasitic branch 2, and floor 3 were coplanar, with the main branch 1 located between the parasitic branch 2 and floor 3. Both the main branch 1 and the parasitic branch 2 were flexible printed circuits attached to the dielectric plate 5. The test results of the front-end and back-end SAR values ​​of this embodiment when transmitting 2.4 GHz and 5 GHz signals, respectively, are shown in Table 7. Taking 0 mm 1-g SAR as an example, the maximum SAR value shows that the gain of the 2.4 GHz signal is 3 dB, and the gain of the 5 GHz signal is 0.7 dB.

[0105] Table 7

[0106]

[0107] The limitations such as collinearity, coaxiality, coplanarity, symmetry (for example, axisymmetry, or center symmetry, etc.), parallelism, perpendicularity, and sameness (for example, same length, same width, etc.) mentioned in the embodiments of the present application are all for the current level of technology, rather than absolutely strict definitions in a mathematical sense. There may be a deviation of less than a predetermined threshold value (for example, 1 mm, 0.5 m, or 0.1 mm) in the line width direction between two collinear radiating branches or the edges of two antenna units. There may be a deviation of less than a predetermined threshold value (for example, 1 mm, 0.5 m, or 0.1 mm) in the direction perpendicular to their coplanar planes between two coplanar radiating branches or the edges of two antenna units. There may be a deviation of a predetermined angle (for example, ±5°, ±10°) between two antenna units that are parallel or perpendicular to each other.

[0108] The above description is merely a preferred embodiment of the present application and is not intended to limit the present application. Various modifications and variations are possible for those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A feeding antenna, characterized in that: The feed antenna comprises: floor; A main branch, wherein the main branch is provided with a feeding branch, and the feeding branch is connected to the floor; A parasitic branch, wherein the parasitic branch is provided with a grounding branch, and the grounding branch is connected to the floor; The main branch and the parasitic branch at least partially overlap.

2. The feed antenna according to claim 1, wherein: Along the length direction of the main branch node, the main branch node includes a first end and a second end, the feeding branch node is located between the first end and the second end, the part of the main branch node located between the first end and the feeding branch node forms a first part, and the part of the main branch node located between the second end and the feeding branch node forms a second part, and the length of the first part is different from the length of the second part.

3. The feed antenna according to claim 2, wherein: The first portion overlaps with at least a portion of the parasitic branch, and the second portion overlaps with at least another portion of the parasitic branch.

4. The feed antenna according to claim 2, wherein: The main branches and the parasitic branches are both perpendicular to the floor.

5. The feeding antenna according to any one of claims 2 to 4, characterized in that: The parasitic branches include a first parasitic branch and a second parasitic branch, and a first spacing space is provided between the first parasitic branch and the second parasitic branch.

6. The feeding antenna according to claim 5, characterized in that The parasitic branch is located between the main branch and the floor.

7. The feeding antenna according to any one of claims 2 to 4, characterized in that: The main branch is located between the parasitic branch and the floor.

8. The feeding antenna according to any one of claims 2 to 4, characterized in that: There are two main branches, which are located on both sides of the parasitic branch, and two ends of the feeding branch are connected to the two main branches respectively. The feeding branch is connected to the floor at a portion between the two ends thereof.

9. The feeding antenna according to any one of claims 2 to 4, characterized in that: The main branches and the parasitic branches are both metal plates.

10. The feeding antenna according to any one of claims 2 to 4, characterized in that: The feeding antenna further includes a dielectric plate, the parasitic branches and the main branches are both flexible circuit boards, and the parasitic branches and the main branches are attached to the dielectric plate.

11. The feeding antenna according to claim 10, characterized in that: The main branch, the parasitic branch and the floor are coplanar.

12. The feeding antenna according to any one of claims 2 to 4, characterized in that: A second spacing space is provided between the main branch and the parasitic branch, and the main branch indirectly couples and feeds the parasitic branch.

13. An electronic device, characterized in that: The electronic device includes the feeding antenna according to any one of claims 1 to 12.

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