Electronic devices and antenna feed devices

Abstract

An electronic device and an antenna feed device are disclosed. The electronic device includes a metal housing, a radiating element, a substrate, and an electrostatic discharge (ESD) protection element. The radiating element is disposed along the edge of the electronic device and is separated from the metal housing. The substrate is disposed on the metal housing and includes a feed portion and a ground portion. The feed portion is coupled to the radiating element, and the ground portion is coupled to the metal housing. The ESD protection element is electrically connected between the feed portion and the ground portion. The electronic device and antenna feed device provided by this invention, through the technical solutions of "creating a clear area by disconnecting the radiating element from the metal housing" and "electrically connecting the ESD protection element to the feed portion," enable the radiating element to simultaneously serve as an antenna radiator and a sensing electrode, thereby improving the problem of excessive electromagnetic wave energy density absorption affecting the human body. Furthermore, the ESD protection element solves the system failure caused by electrostatic discharge or surges to the components inside the electronic device.

Description

Technical Field

[0001] This invention relates to an electronic device and an antenna feed device, and more particularly to an electronic device and an antenna feed device with electrostatic discharge protection design. Background Technology

[0002] In recent years, electronic devices have been trending towards a thinner, lighter, and smaller design. For 3C products such as laptops and tablets, narrow bezels are incorporated into the display to achieve a slim and aesthetically pleasing design, while metal back covers are often used to ensure structural strength.

[0003] However, the aforementioned structure increases the difficulty of designing the antenna within the device. In existing technology, designing an antenna within a metal frame that is disconnected from the relative wavelength of the metal casing is one approach. However, this design raises concerns about the electromagnetic waves emitted by the antenna potentially affecting the human body, specifically due to concerns about excessively high SAR (Specific Absorption Rate). Furthermore, because the antenna is located at the edge of the outer frame, it also presents the risk of ESD (Electrostatic Discharge) damage to electronic components. Therefore, considering these factors, a new architecture needs to be researched that simultaneously meets antenna characteristics and SAR safety specifications.

[0004] Therefore, how to overcome the above-mentioned defects by improving the structural design to simultaneously meet the antenna characteristics and SAR safety specifications has become one of the important issues to be solved in this field. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide an electronic device and an antenna feed device to address the shortcomings of the prior art.

[0006] To address the aforementioned technical problems, one technical solution adopted by the present invention is to provide an electronic device comprising: a metal housing, a radiating element, a substrate, and an electrostatic discharge (ESD) protection element. The radiating element is disposed along the edge of the electronic device and is separated from the metal housing. The substrate is disposed on the metal housing and includes a feed portion and a ground portion. The feed portion is coupled to the radiating element, and the ground portion is coupled to the metal housing. The ESD protection element is electrically connected between the feed portion and the ground portion.

[0007] To address the aforementioned technical problems, one technical solution adopted by the present invention is to provide an electronic device comprising: a metal housing, a radiating element, a substrate, and an electrostatic discharge (ESD) protection element. The radiating element is disposed along the edge of the electronic device and is separated from the metal housing. The substrate is disposed on the metal housing and includes a feed portion and a ground portion. The feed portion is coupled to the radiating element, and the ground portion is coupled to the metal housing. The electronic device further includes a grounding element electrically connected to the metal housing and coupled to the ground portion. The ESD protection element is electrically connected between the feed portion and the ground portion.

[0008] To address the aforementioned technical problems, another technical solution adopted by the present invention is to provide an antenna feed device, comprising: a substrate and an electrostatic discharge (ESD) protection element. The antenna feed device is disposed on a metal housing and coupled to a radiating element, wherein the radiating element and the metal housing are separate from each other. The substrate is disposed on the metal housing and includes a feed portion and a ground portion. The feed portion is coupled to the radiating element, and the ground portion is coupled to the metal housing. The ESD protection element is electrically connected between the feed portion and the ground portion.

[0009] To address the aforementioned technical problems, another technical solution adopted by the present invention is to provide an antenna feed device, comprising: a substrate and an electrostatic discharge (ESD) protection element. The substrate is disposed on a metal housing and includes a feed portion and a ground portion, the feed portion being coupled to a radiating element. The ESD protection element is electrically connected to the feed portion.

[0010] One of the beneficial effects of the present invention is that the electronic device and antenna feed device provided by the present invention can improve the problem of excessive SAR affecting the human body by using the technical solutions of "separation between the radiating element and the metal housing" and "electrical connection of the electrostatic protection element to the feed part", so that the radiating element can simultaneously serve as an antenna radiator and a sensing electrode (sensor electrode or sensor pad), and solve the problem of damage to the components inside the electronic device by electrostatic discharge by using the electrostatic protection element.

[0011] To further understand the features and technical content of the present invention, please refer to the following detailed description and drawings of the present invention. However, the drawings provided are for reference and illustration only and are not intended to limit the present invention. Attached Figure Description

[0012] Figure 1 This is a three-dimensional schematic diagram of an electronic device according to an embodiment of the present invention.

[0013] Figure 2 This is a top view of the electronic device without an antenna feed device.

[0014] Figure 3 This is a schematic diagram showing the disconnect between the radiating element and the metal casing of an electronic device according to an embodiment of the present invention.

[0015] Figure 4 This is a three-dimensional schematic diagram of the radiating component of an electronic device according to an embodiment of the present invention.

[0016] Figure 5 This is a top view of the electronic device according to an embodiment of the present invention with an antenna feed device added inside.

[0017] Figure 6 This is a schematic diagram of the first surface of the antenna feeding device according to an embodiment of the present invention.

[0018] Figure 7 This is a schematic diagram of the second surface of the antenna feed device according to an embodiment of the present invention.

[0019] Explanation of key component symbols:

[0020] D Electronic Device

[0021] U-antenna feed device

[0022] T Clearance Area

[0023] 1. Metal casing

[0024] 2 Radiation components

[0025] 21 Long Arm

[0026] 22 Short Arm

[0027] 23 Metal connection parts

[0028] 3 substrate

[0029] 301 Long Body Section

[0030] 302 Short body part

[0031] 303 through hole

[0032] 304 guide hole

[0033] 31 First Surface

[0034] 32 Second Surface

[0035] 33 Feeding section

[0036] 331 Section 6

[0037] 34 Grounding part

[0038] 341 First Section

[0039] 342 Second Section

[0040] 343 Third Section

[0041] 344 Fourth Section

[0042] 345 Fifth Section

[0043] 4. Grounding components

[0044] 5. Static electricity protection components

[0045] 6 Feeding components

[0046] 61 Feed-in end

[0047] 62 Grounding terminal

[0048] 7. Capacitor Components

[0049] 8. Inductor components

[0050] 9 Parasitic elements

[0051] S switching circuit

[0052] H1 First Shell

[0053] H2 Second Shell

[0054] E Passive Components

[0055] P Proximity sensing circuit

[0056] Average widths of W1 and W2

[0057] X and Y directions Detailed Implementation

[0058] The following specific embodiments illustrate the implementation of the "electronic device and antenna feed device" disclosed in this invention. Those skilled in the art can understand the advantages and effects of this invention from the content disclosed in this specification. This invention can be implemented or applied through other different specific embodiments, and various details in this specification can also be modified and changed based on different viewpoints and applications without departing from the concept of this invention. Furthermore, the accompanying drawings of this invention are for simple illustration only and are not depictions of actual dimensions, as stated beforehand. The following embodiments will further describe the relevant technical content of this invention in detail, but the disclosed content is not intended to limit the scope of protection of this invention. In addition, it should be understood that although terms such as "first," "second," and "third" may be used herein to describe various elements, these elements should not be limited by these terms. These terms are mainly used to distinguish one element from another. Furthermore, the term "or" used herein may, depending on the actual situation, include any one or more combinations of the associated listed items. Additionally, throughout this invention, "connect" means a physical connection between two elements, whether direct or indirect.

[0059] [Example]

[0060] First, refer to Figure 1 As shown, this embodiment of the invention provides an electronic device D, which has the function of transmitting and receiving radio frequency (RF) signals. For example, the electronic device D may be a smartphone, a tablet computer, or a notebook computer, but the invention is not limited thereto. Furthermore, for example, the electronic device D can generate an operating frequency band between 617MHz and 5925MHz, but the invention is not limited thereto.

[0061] As described above, this invention will use a notebook computer as an example to illustrate the electronic device D. The electronic device D includes a metal casing 1, a radiating element 2, a substrate 3, and an electrostatic discharge (ESD) protection element 5. Further, the electronic device D may also include a first casing H1 and a second casing H2. The first casing H1 may be a component C of the notebook computer, and the second casing H2 may be a component D of the notebook computer. The metal casing 1, the radiating element 2, the substrate 3, and the ESD protection element 5 are disposed within the electronic device D. The substrate 3 and the ESD protection element 5 form an antenna feed device U disposed within the electronic device D for transmitting and receiving wireless radio frequency signals. That is, the antenna feed device U includes the substrate 3 and the ESD protection element 5, and the antenna feed device U is disposed on the metal casing 1 and coupled to the radiating element 2.

[0062] See Figure 2 and Figure 3 As shown, Figure 2 This is a top view of the electronic device without an antenna feed system. Figure 3 This is a schematic diagram illustrating the disconnect between the radiating element and the metal casing of an electronic device according to an embodiment of the present invention. Specifically, the radiating element 2 is embedded inside the electronic device D, and the radiating element 2 is arranged along the edge of the electronic device D. The radiating element 2 is separated from the metal casing 1, or in other words, the two sides of the radiating element 2 are disconnected from the metal casing 1 to form a clear area T (e.g., Figure 3 (As shown). To be precise, the radiating element 2 is itself part of the metal housing 1, and it is mainly located at the edge of the metal housing 1, that is, the metal frame of the edge. Therefore, after the radiating element 2 (the metal frame of the edge) is disconnected from the metal housing 1, the radiating element 2 forms an independent component, and the disconnection positions between the two sides of the radiating element 2 and the metal housing 1 respectively form a clear area T.

[0063] For the specific shape of radiating component 2, please refer to [reference needed]. Figure 4As shown, the radiating element 2 includes a long arm 21, a short arm 22, and a metal connecting portion 23. The short arm 22 is vertically connected to one end of the long arm 21 to form an L-shaped structure, and the metal connecting portion 23 is located at the junction between the long arm 21 and the short arm 22. Additionally, it should be noted that... Figure 2 The radiating element 2 shown has its long arm 21 positioned along the edge of the electronic device D in the negative X direction, and its short arm 22 positioned along the edge of the electronic device D in the positive Y direction. It is worth noting that, further reference... Figure 3 As shown, the average width W1 of the short arm 22 is greater than the average width W2 of the long arm 21. Therefore, the radiator 2 can utilize the structural feature that the average width W1 of the short arm 22 is greater than the average width W2 of the long arm 21 to increase the bandwidth of the high-frequency band.

[0064] See Figures 5 to 7 As shown. The antenna feed device U also includes a grounding component 4, meaning that the antenna feed device U includes a substrate 3, a grounding component 4, and an electrostatic discharge protection element 5. For example... Figure 5 As shown, when the antenna feed device U is mounted on the metal housing 1, it is actually stacked on top of the radiating element 2. Therefore, the substrate 3 is also mounted on the metal housing 1, and the position of the feed portion 33 overlaps with the position of the metal connection portion 23. Figure 6 As shown, the substrate 3 includes a feed section 33, a ground section 34, a long body section 301, and a short body section 302. The feed section 33 is coupled to the radiator 2, the ground section 34 is coupled to the metal housing 1, and the long body section 301 is vertically connected to the short body section 302. The feed section 33 is located at the junction between the long body section 301 and the short body section 302. The feed section 33 has a through hole 303 that penetrates the substrate 3. Therefore, when the antenna feed device U is stacked above the radiator 2, the position of the through hole 303 overlaps with the position of the metal connection section 23, and the metal connection section 23 is electrically connected to the feed section 33. As mentioned above, in this embodiment, the metal connection part 23 is a screw hole. Therefore, a stud (not shown) can be inserted into the through hole 303 and the metal connection part 23 to fix the antenna feed device U and the radiating element 2. The feed part 33 is coupled to the radiating element 2, thereby making the antenna feed device U and the radiating element 2 electrically connected. The antenna feed device U generates an operating frequency band with a frequency range between 617MHz and 5925MHz through the radiating element 2.

[0065] It is worth mentioning that in this embodiment, the metal connection portion 23 is a screw hole, but the present invention is not limited to this. That is, the metal connection portion 23 is not necessarily a screw hole, and the feed portion 33 does not necessarily need to have a through hole 303 penetrating the substrate 3. The present invention does not limit the coupling method between the metal connection portion 23 and the feed portion 33. For example, the metal connection portion 23 can also be other structural forms, such as a surface mount spring (SMT spring), that is, the radiating element 2 can be electrically connected to the feed portion 33 through the SMT spring. Alternatively, for example, the SMT spring can also be disposed on the substrate 3 to electrically connect to the feed portion 33, and the feed portion 33 is then electrically connected to the metal connection portion 23 through the SMT spring.

[0066] Continue reading Figure 6 and Figure 7 As shown, Figure 6 This is a schematic diagram of the first surface of the antenna feed device of the electronic device according to an embodiment of the present invention. Figure 7 This is a schematic diagram of the second surface of the antenna feed device of an electronic device according to an embodiment of the present invention. The substrate 3 includes a first surface 31 and a second surface 32 opposite to each other. The first surface 31 is provided with a feed portion 33 and a ground portion 34, while a grounding member 4 is disposed on the second surface 32 and coupled to the metal housing 1. The ground portion 34 of the antenna feed device U is grounded (i.e., connected to the metal housing 1) through the grounding member 4. For example, the feed portion 33, the ground portion 34, and the grounding member 4 can be a metal sheet, a metal wire, or other conductive material with conductive properties. The feed member 6 can be a coaxial cable. The substrate 3 can be an FR4 (Flame Retardant 4) substrate, a printed circuit board (PCB), or a flexible printed circuit board (FPCB), however, the present invention is not limited thereto.

[0067] For example, the grounding portion 34 includes a first segment 341, a second segment 342 connected to the first segment 341 and turning relative to the first segment 341, a third segment 343 connected to the first segment 341 and turning relative to the second segment 342, a fourth segment 344 connected to the second segment 342 and turning relative to the second segment 342, and a fifth segment 345 connected to the second segment 342. The electronic device D can adjust the operating frequency band (mid-to-high frequency band), impedance matching, return loss, and / or radiation efficiency generated by the radiator 2 through the fourth segment 344 and the fifth segment 345 of the grounding portion 34. The fifth segment 345 is coupled to the feed-in portion 33. Furthermore, the feed-in portion 33 includes a sixth segment 331 coupled to the first segment 341 of the grounding portion 34, and the electronic device D can adjust the operating frequency band, impedance matching, return loss, and / or radiation efficiency generated by the radiator 2 through the sixth segment 331 of the feed-in portion 33.

[0068] Grounding element 4 is electrically connected to metal housing 1 and coupled to grounding portion 34. For example, grounding portion 34 is coupled to grounding element 4 via via hole 304 on substrate 3. Furthermore, grounding element 4 includes a layer of conductive foam or a metal spring; in this embodiment, conductive foam is used as an example, and the conductive foam can be adhered to grounding element 4 formed of metal sheet or metal wire. It is worth noting that although grounding portion 34 is grounded through grounding element 4 in this embodiment, in other embodiments, grounding element 4 may not necessarily be provided on the second surface 32 of substrate 3 (i.e., antenna feed device U only includes substrate 3 and electrostatic discharge protection element 5), and grounding portion 34 can also be directly grounded, i.e., directly connected to metal housing 1. In other words, the present invention does not limit the grounding method of grounding portion 34. Grounding portion 34 can be grounded indirectly by connecting to metal housing 1 through grounding element 4, or directly grounded by connecting directly to metal housing 1 without needing grounding element 4.

[0069] Further reading Figure 2 and Figure 6As shown, the electrostatic discharge protection element 5 is electrically connected between the feed section 33 and the ground section 34. Specifically, one end of the electrostatic discharge protection element 5 is electrically connected to the feed section 33, and the other end is grounded through an electrical connection to the ground section 34. The electronic device D further includes a feed member 6, which includes a feed end 61 and a ground end 62. The feed end 61 is coupled to the feed section 33, and the ground end 62 is coupled to the ground section 34. The antenna feed device U feeds in a signal through the feed end 61 of the feed member 6. The signal is then conducted through the feed section 33 and the metal connection 23 to the radiating element 2 before being radiated out. In other words, the present invention forms a monopole antenna with a metal frame (i.e., the radiating element 2) that is disconnected from the metal housing 1. Furthermore, the present invention uses a section of metal frame (Metal Ring) disconnected from the edge of the metal housing 1 as the antenna radiator, which can form a relatively large clearance area T in the antenna design, giving the antenna better radiation characteristics.

[0070] As mentioned above, while using a metal frame as the antenna radiator provides good radiation characteristics, the proximity of the radiating element 2 to the edge of the electronic device D makes it prone to electrostatic discharge (ESD) problems. Therefore, this invention uses a metal frame as the antenna radiator and electrically connects the feed section 33 to an ESD protection element 5 to prevent system malfunctions caused by ESD or surges. For example, the ESD protection element 5 can be a transient voltage suppressor diode, but this invention is not limited to this.

[0071] Continue reading Figure 3 , Figure 6 and Figure 7 As shown, it should be noted that, Figure 3The circuit shown is for illustrative purposes only and does not represent a direct electrical connection between the circuit and the radiating element. As mentioned above, the antenna feed device U is actually stacked above the radiating element 2. The antenna feed device U receives the signal through the feed terminal 61 of the feed element 6. The signal is then conducted to the radiating element 2 via the feed section 33 and a stud before being radiated out. Furthermore, the electronic device D also includes at least one capacitor element 7. More precisely, the antenna feed device U inside the electronic device D, in addition to including the substrate 3, the grounding element 4, and the electrostatic discharge protection element 5, may also include at least one capacitor element 7. At least one capacitor element 7 is connected in series between the feed section 33 and the feed terminal 61, that is, connected in series in the conductive path between the feed section 33 and the feed terminal 61. In addition, at least one capacitor element 7 can also be used for impedance matching of the antenna feed device U. It should be noted that the present invention is not limited by the number of capacitor elements 7. Multiple capacitor elements 7 connected in series between the feed section 33 and the feed terminal 61 may also be provided in the electronic device D. Furthermore, the total capacitance of at least one capacitor element 7 connected in series between the feed section 33 and the feed terminal 61 is greater than 6pF. That is, when only one capacitor element 7 is connected in series between the feed section 33 and the feed terminal 61, the inductance of this capacitor element 7 is greater than 6pF; when multiple capacitor elements 7 are connected in series between the feed section 33 and the feed terminal 61, the total capacitance of the multiple capacitor elements 7 is greater than 6pF. Furthermore, when multiple capacitor elements 7 are connected in series between the feed section 33 and the feed terminal 61, the electronic device D can be used with a switching circuit (not shown) to switch different capacitance values, thereby adjusting the antenna matching and resonant frequency offset, so that the antenna feed device U generates an operating frequency band between 617MHz and 5925MHz through the radiating element 2.

[0072] Preferably, the electronic device D further includes at least one inductor 8 and a proximity sensing circuit P. More specifically, the antenna feed device U inside the electronic device D includes, in addition to the substrate 3, grounding element 4, electrostatic discharge protection element 5, and at least one capacitor element 7, at least one inductor 8 and a proximity sensing circuit P. At least one inductor 8 is connected in series between the radiating element 2 and the proximity sensing circuit P, that is, in series on the conductive path between the radiating element 2 and the proximity sensing circuit P, and the proximity sensing circuit P can be directly or indirectly electrically connected to the grounding element 4. In this embodiment, at least one inductor 8 can be connected in series on the conductive path between the feed portion 33 and the proximity sensing circuit P, and is adjacent to the feed portion 33. That is, at least one inductor 8 will be as close as possible to the feed portion 33 on the substrate 3, thereby reducing the transmission path of high-frequency signals and avoiding interference caused by redundant transmission paths of high-frequency signals. Furthermore, it should be noted that although... Figure 6The proximity sensing circuit P is grounded by connecting to the grounding part 34. However, the present invention is not limited to the grounding method of the proximity sensing circuit P. That is, the proximity sensing circuit P can be directly or indirectly electrically connected to the grounding part 4. With the arrangement of at least one inductor 8 and a proximity sensing circuit P, the electronic device D can have the function of sensing whether a human body is close to the antenna feed device U, thereby adjusting the radiation power of the antenna feed device U and avoiding the problem of excessively high specific absorption rate (SAR) of electromagnetic wave energy per unit mass of biological body.

[0073] Furthermore, in one embodiment, the proximity sensing circuit P can be electrically connected to a control circuit (not shown) so that the control circuit can adjust the radiation power of the antenna feed device U based on a signal sensed by the proximity sensing circuit P. However, it should be noted that in other embodiments, the circuit or control element for receiving the signal from the proximity sensing circuit P can be integrated into the proximity sensing circuit P, without the need for a separate control circuit to receive the signal. In this way, the proximity sensing circuit P can be used to determine the distance between an object (e.g., a user's leg or other body part) and the antenna feed device U. Further, the proximity sensing circuit P can be a capacitance sensing circuit. In this case, since the radiating element 2 is separated from the metal housing 1, the radiating element 2 (metal frame) can be considered as a sensing electrode (sensor electrode or sensor pad) rather than an antenna radiator, allowing the proximity sensing circuit P to measure the capacitance value. In this way, the control circuit can determine whether the user's leg or other body part is within a predetermined detection range of a nearby antenna feed device U by the change in capacitance value sensed by the proximity sensing circuit P. When the user's legs or other body parts are within the predetermined detection range, the control circuit can reduce the radiation power of the antenna feed device U to avoid excessively high SAR values. When the user's legs or other body parts are outside the predetermined detection range, the control circuit can increase the radiation power of the antenna feed device U to maintain the overall efficiency of the antenna feed device U.

[0074] It should be noted that the present invention is not limited by the number of inductor elements 8. Multiple inductor elements 8 connected in series between the radiator 2 and the proximity sensing circuit P can also be provided in the electronic device D. Furthermore, the total inductance value of at least one inductor element 8 connected in series between the radiator 2 and the proximity sensing circuit P is greater than 20nH. That is, when only one inductor element 8 is connected in series between the radiator 2 and the proximity sensing circuit P, the inductance value of this inductor element 8 is greater than 20nH; when multiple inductor elements 8 are connected in series between the radiator 2 and the proximity sensing circuit P, the total inductance value of the multiple inductor elements 8 is greater than 20nH. Therefore, the present invention utilizes at least one inductor element 8 as an RF choke to prevent mutual interference between the antenna feed device U and the proximity sensing circuit P, thereby blocking the transmission of AC signals (i.e., RF signals) fed in by the feed device 6 to the proximity sensing circuit P and thus preventing interference.

[0075] Continuing from the above, further, the electrostatic discharge (ESD) protection element 5 is connected in parallel to the proximity sensing circuit P. One end of the ESD protection element 5 is electrically connected to the proximity sensing circuit P at a connection point located between at least one inductor 8 and the proximity sensing circuit P. In other words, the ESD protection element 5 is connected in parallel to the system ground before the proximity sensing circuit P to prevent damage to the proximity sensing circuit P from electrostatic discharge or surges. Furthermore, this design avoids directly connecting one end of the ESD element to the feed unit 33, preventing high-frequency signals from being directly transmitted to the ESD element, causing mutual interference between the ESD element and the high-frequency signal, resulting in noise and affecting the performance of the antenna structure composed of the radiating element 2 and the antenna feed device U. It should be noted that although... Figure 6 The electrostatic discharge (ESD) protection element 5 is grounded by connecting to the grounding part 34. However, the present invention is not limited to the grounding method of the ESD protection element 5. That is, the ESD protection element 5 can be directly or indirectly electrically connected to the grounding part 4. In addition, the at least one capacitor element 7 mentioned above can be used as a DC block to prevent the DC signal generated by the proximity sensing circuit P from flowing into the system through the feeder 6 and affecting or damaging other components inside the electronic device D.

[0076] Additionally, please refer to... Figure 6As shown, the electronic device D also includes a parasitic element 9 and a switching circuit S. More specifically, the antenna feed device U inside the electronic device D, in addition to including the substrate 3, grounding element 4, electrostatic discharge protection element 5, at least one inductor 8, a proximity sensing circuit P, and at least one capacitor 7, may also include a parasitic element 9 and a switching circuit S. The parasitic element 9 is coupled to the grounding element 4. The parasitic element 9 may be a metal microstrip line. The antenna feed device U also includes several passive elements E, but the present invention is not limited by the type and number of passive elements. The passive element E may, for example, be at least one inductor, at least one capacitor, at least one resistor, or a combination thereof, and the switching circuit S includes one or more switching switches. For example, the passive element E may be two inductors, or one inductor and one capacitor, or one inductor, one capacitor, and one resistor. However, it should be noted that in other embodiments, no passive elements may be provided on the grounding path, and the present invention is not limited by the presence or absence of passive elements. The switching circuit S and the passive element E are electrically connected between the parasitic element 9 and the grounding element 4. The electronic device D, through the switching circuit S, can switch to different signal transmission paths. Each signal transmission path corresponds to a switching switch and a combination of different passive elements (inductors, capacitors, and / or resistors). The electronic device D can use the passive element E to adjust the operating bandwidth, impedance matching, return loss, and / or radiation efficiency of the antenna feed device U.

[0077] [Beneficial Effects of the Examples]

[0078] One of the beneficial effects of this invention is that the electronic device D and antenna feed device U provided by the invention, through the technical solution of "forming a clear area T by disconnecting the radiating element 2 from the metal housing 1" and "electrically connecting the electrostatic protection element 5 to the feed part 33", allow the radiating element 2 to simultaneously serve as an antenna radiator and a sensing electrode (sensor electrode or sensor pad). This not only enables the transmission of radio frequency signals but also mitigates the problem of excessively high SAR affecting the human body. Furthermore, the electrostatic protection element 5 solves the problem of system malfunctions caused by electrostatic discharge or surges to the components inside the electronic device D.

[0079] Furthermore, since the radiating element 2 is part of the metal housing 1 and is mainly located at the edge of the metal housing 1, the electronic circuit components in the electronic device D (such as the electrostatic protection element 5, the capacitor element 7, the inductor element 8, the proximity sensing circuit P, etc.) cannot be directly electrically connected to the radiating element 2. Instead, they need to be electrically connected to the radiating element 2 through the substrate 3 of the antenna feed device U and its feed portion 33 and ground portion 34.

[0080] Furthermore, this invention utilizes at least one inductor 8 as an RF choke to prevent interference between the antenna feed device U and the proximity sensing circuit P, thereby blocking the AC signal (i.e., RF signal) fed by the feed device 6 from transmitting to the proximity sensing circuit P and causing interference. In addition, this invention uses at least one capacitor 7 as a DC blocker to prevent the DC signal generated by the proximity sensing circuit P from flowing into the system through the feed device 6 and affecting or damaging other components inside the electronic device D.

[0081] The above-disclosed content is only a preferred and feasible embodiment of the present invention, and is not intended to limit the scope of the claims of the present invention. Therefore, all equivalent technical changes made based on the content of the present invention specification and drawings are included within the scope of the claims of the present invention.

Claims

1. An electronic device comprising: A metal casing; A radiating element is disposed along the edge of the electronic device and is separate from the metal housing; A substrate is disposed on the metal housing. The substrate includes a feed portion and a ground portion. The feed portion is coupled to the radiating element, and the ground portion is coupled to the metal housing. as well as An electrostatic discharge (ESD) protection element is electrically connected between the feed-in portion and the grounding portion; The electronic device further includes: at least one inductor and a proximity sensing circuit, wherein the electrostatic discharge protection element is connected in parallel to the proximity sensing circuit, and one end of the electrostatic discharge protection element is electrically connected to the proximity sensing circuit at a connection point, the connection point being located between the at least one inductor and the proximity sensing circuit. The radiating element is a monopole antenna.

2. The electronic device as claimed in claim 1, wherein, The radiating element includes a long arm, a short arm, and a metal connecting part. The short arm is vertically connected to one end of the long arm, and the metal connecting part is opened at the junction between the long arm and the short arm. The feed-in part is electrically connected to the metal connecting part.

3. The electronic device as claimed in claim 2, wherein, The long arm is connected to the short arm to form an L-shaped structure, and the average width of the short arm is greater than the average width of the long arm.

4. The electronic device as claimed in claim 2, wherein, The substrate also includes a long body portion and a short body portion, the short body portion being vertically connected to the long body portion, wherein the feed portion is disposed at the junction between the long body portion and the short body portion, and the position of the feed portion overlaps with the position of the metal connection portion.

5. The electronic device of claim 4, further comprising: A feeder and at least one capacitor element, the feeder including a feed end and a ground end, the feed end being coupled to the feed portion and the ground end being coupled to the ground portion, and the at least one capacitor element being connected in series between the feed portion and the feed end.

6. The electronic device of claim 1, further comprising: A grounding element is electrically connected to the metal housing and coupled to the grounding portion.

7. The electronic device as claimed in claim 5, wherein, The capacitance of at least one capacitor element is greater than 6 pF.

8. The electronic device as claimed in claim 1, wherein, At least one inductor is connected in series between the feed section and the proximity sensing circuit and is adjacent to the feed section.

9. The electronic device as claimed in claim 8, wherein, The inductance value of at least one inductor is greater than 20 nH.

10. The electronic device of claim 6, further comprising: A parasitic element and a switching circuit are provided, wherein the parasitic element is coupled to the grounding element and the switching circuit is electrically connected between the parasitic element and the grounding element.

11. The electronic device as claimed in claim 1, wherein, The electrostatic discharge protection component is a transient voltage suppression diode.

12. An antenna feed device, the antenna feed device being disposed on a metal housing and coupled to a radiating element, the radiating element being separate from the metal housing, the antenna feed device comprising: A substrate is disposed on the metal housing. The substrate includes a feed portion and a ground portion. The feed portion is coupled to the radiating element, and the ground portion is coupled to the metal housing. as well as An electrostatic discharge (ESD) protection element is electrically connected between the feed-in portion and the grounding portion; The antenna feed device further includes: at least one inductor and a proximity sensing circuit, wherein the electrostatic discharge protection element is connected in parallel with the proximity sensing circuit, and one end of the electrostatic discharge protection element is electrically connected to the proximity sensing circuit at a connection point, the connection point being located between the at least one inductor and the proximity sensing circuit. The radiating element is a monopole antenna.

13. The antenna feed device as claimed in claim 12, wherein, The substrate includes a long body portion and a short body portion, the short body portion being vertically connected to the long body portion. The feed portion is disposed at the junction between the long body portion and the short body portion, and the position of the feed portion overlaps with the position of a metal connection portion of the radiating element.

14. The antenna feed device as claimed in claim 13, further comprising: At least one capacitor element is connected in series between the feed section and a feed terminal of a feed member.

15. The antenna feed device as claimed in claim 14, wherein, The capacitance of at least one capacitor element is greater than 6pF.

16. The antenna feed device as claimed in claim 12, further comprising: A grounding element is electrically connected to the metal housing and coupled to the grounding portion.

17. The antenna feed device as claimed in claim 12, wherein, At least one inductor is connected in series between the feed section and the proximity sensing circuit.

18. The antenna feed device as claimed in claim 17, wherein, The inductance value of at least one inductor is greater than 20nH.

19. The antenna feed device as claimed in claim 16, further comprising: A parasitic element and a switching circuit are provided, wherein the parasitic element is electrically connected to the grounding element and the switching circuit is electrically connected between the parasitic element and the grounding element.

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