Handheld electronic device and its multi-antenna wireless transmission system

Abstract

A handheld electronic device and a multi-antenna wireless transmission system thereof are related to a multi-antenna wireless transmission system having a plurality of antenna coils and an antenna driving circuit. The antenna coils include a first antenna coil and at least a second antenna coil, and the first antenna coil and the second antenna coil are configured with different radiation directions. The antenna driving circuit is coupled to the antenna coils and includes a plurality of antenna matching circuits, a first short-range wireless transmission module, a receiving-end switch circuit and a transmitting-end switch circuit. The antenna matching circuits correspond to the antenna coils respectively and are coupled to the corresponding antenna coils. The receiving-end switch circuit and the transmitting-end switch circuit are coupled between each antenna matching circuit and the first short-range wireless transmission module.

Description

Technical Field

[0001] This utility model relates to a handheld electronic device and its multi-antenna wireless transmission system. Background Technology

[0002] Modern people widely use digital identification technology to replace document signing and financial payment processes. Currently, the most secure wireless identification technology is NFC (Near Field Communication). NFC technology enables contactless data exchange between electronic devices. With NFC, remote devices cannot easily steal private data; identification and authorization can only be performed when the person holding the mobile device brings the mobile device or an identifier with a near-field communication chip (e.g., a credit card using near-field communication identification, or identification cards used by companies or organizations) close to the reader. With the development of NFC technology, the application of NFC devices in mobile devices is becoming increasingly common. Utility Model Content

[0003] In some embodiments, a handheld electronic device includes a housing, a display panel, a processing module, multiple antenna coils, multiple antenna matching circuits, a first short-range wireless transmission module, a receiver switching circuit, and a transmitter switching circuit. The housing includes a back cover and a frame. The back cover is connected to the frame. The display panel is located within the housing and adjacent to the opposite side of the housing relative to the back cover. The processing module is located within the housing and coupled to the display panel. The antenna coils are located within the housing and include a first antenna coil and at least one second antenna coil. The first antenna coil is disposed inside the frame. A second antenna coil is disposed inside the display panel or inside the back cover. The antenna matching circuits are located within the housing and correspond to the antenna coils respectively. Each antenna matching circuit is coupled to its corresponding antenna coil. The first short-range wireless transmission module is located within the housing and coupled to the processing module. The receiver switching circuit is located within the housing and coupled between each antenna matching circuit and the first short-range wireless transmission module. The transmitter switching circuit is located within the housing and coupled between each antenna matching circuit and the first short-range wireless transmission module.

[0004] In some embodiments, the handheld electronic device further includes multiple filtering circuits. These filtering circuits are located within the housing and correspond to antenna matching circuits. Each filtering circuit is coupled between the transmitter switching circuit and the corresponding antenna matching circuit and is configured to suppress or filter noise in the radio frequency signal.

[0005] In some embodiments, the handheld electronic device further includes an electromagnetic interference shielding structure. The electromagnetic interference shielding structure is located within the housing and serves to isolate the antenna coil from the antenna matching circuit, the first short-range wireless transmission module, the receiver switching circuit, and the transmitter switching circuit.

[0006] In some embodiments, the handheld electronic device further includes a magnetically conductive substrate. The magnetically conductive substrate is located within the housing and corresponds to an antenna coil. Each magnetically conductive substrate is disposed on the opposite side of the housing relative to the corresponding antenna coil.

[0007] In some embodiments, the handheld electronic device further includes an electronic paper tag. The electronic paper tag is configured to wirelessly communicate with at least one of the second antenna coils.

[0008] In some embodiments, the electronic paper tag includes an electronic paper display, an electronic paper circuit board, an induction coil, and a second short-range wireless transmission module. The electronic paper display has a display surface. The electronic paper circuit board is located on the opposite side of the electronic paper display from the display surface and is electrically connected to the electronic paper display. The induction coil is located on the surface of the electronic paper circuit board on the opposite side of the electronic paper display and is electrically coupled to at least one of the second antenna coils. The second short-range wireless transmission module is disposed on the electronic paper circuit board and is electrically connected to the induction coil.

[0009] In some embodiments, the handheld electronic device further includes a spacer and a magnetic substrate. The spacer is coupled to an electronic paper circuit board. The magnetic substrate is coupled to the spacer and is located on opposite sides of the spacer, respectively, as is the electronic paper circuit board. One of the second antenna coils is formed on the surface of the magnetic substrate.

[0010] In some embodiments, the second short-range wireless transmission module is a near-field communication chip.

[0011] In some embodiments, the handheld electronic device also includes a stand. The stand is located between the electronic paper display and the electronic paper circuit board and is used to secure the electronic paper display.

[0012] In some embodiments, a multi-antenna wireless transmission system includes multiple antenna coils and an antenna driving circuit. The antenna driving circuit is coupled to the antenna coils. Each antenna coil includes a first antenna coil and at least one second antenna coil. The second antenna coil is configured with different radiation directions than the first antenna coil. The antenna driving circuit includes multiple antenna matching circuits, a first short-range wireless transmission module, a receiver switching circuit, and a transmitter switching circuit. Each antenna matching circuit corresponds to one of the antenna coils, and each antenna matching circuit is coupled to its corresponding antenna coil. The receiver switching circuit is coupled between each antenna matching circuit and the first short-range wireless transmission module. The transmitter switching circuit is coupled between each antenna matching circuit and the first short-range wireless transmission module.

[0013] In some embodiments, the multi-antenna wireless transmission system further includes multiple filtering circuits. Each filtering circuit corresponds to an antenna matching circuit. Each filtering circuit is coupled between the transmitter switching circuit and its corresponding antenna matching circuit and is configured to suppress or filter noise in the radio frequency signal.

[0014] In some embodiments, the multi-antenna wireless transmission system further includes an electromagnetic interference shielding structure. The electromagnetic interference shielding structure is located between the antenna coil and the antenna drive circuit, and is used to isolate the antenna coil from the antenna drive circuit.

[0015] In some embodiments, the multi-antenna wireless transmission system further includes multiple magnetically conductive substrates. Each magnetically conductive substrate corresponds to an antenna coil. Each antenna coil is disposed on its corresponding magnetically conductive substrate.

[0016] In some embodiments, the multi-antenna wireless transmission system further includes an electronic paper display, an electronic paper circuit board, an induction coil, and a second short-range wireless transmission module. The electronic paper display has a display surface. The electronic paper circuit board is located on the opposite side of the electronic paper display from the display surface and is electrically connected to the electronic paper display. The induction coil is located on the surface of the electronic paper circuit board on the opposite side of the electronic paper display and is electrically coupled to at least one of the second antenna coils. The second short-range wireless transmission module is disposed on the electronic paper circuit board and is electrically connected to the induction coil.

[0017] In some embodiments, the multi-antenna wireless transmission system further includes a spacer and a magnetic substrate. The spacer is coupled to an electronic paper circuit board. The magnetic substrate is coupled to the spacer and is located on opposite sides of the spacer, respectively, along with the electronic paper circuit board. One of the second antenna coils is formed on the surface of the magnetic substrate.

[0018] In some embodiments, the multi-antenna wireless transmission system further includes a bracket. The bracket is located between the electronic paper display and the electronic paper circuit board and is used to secure the electronic paper display.

[0019] In some embodiments, the arrangement plane of each second antenna coil has an angle with the arrangement plane of the first antenna coil, and the angle is 90±5 degrees.

[0020] In some embodiments, the first short-range wireless transmission module is a near-field communication chip.

[0021] In some embodiments, the sensing distance of each antenna coil is less than 100 mm.

[0022] In some embodiments, the receiver switching circuit includes a plurality of first switching units, each first switching unit having multiple input terminals coupled to a plurality of antenna matching circuits, and each first switching unit having an output terminal coupled to a first short-range wireless transmission module. In some embodiments, when applied to a handheld electronic device, each first switching unit is also coupled to a processing module via a control terminal.

[0023] In some embodiments, the transmitter switching circuit includes a plurality of second switching units, each second switching unit having multiple output terminals coupled to a plurality of filter circuits, and each second switching unit having an input terminal coupled to a first short-range wireless transmission module. In some embodiments, when applied to a handheld electronic device, each second switching unit is also coupled to a processing module via a control terminal.

[0024] In some embodiments, the number of second-day coils is one.

[0025] In some embodiments, the number of second antenna coils is two. In some embodiments, when applied to a handheld electronic device, one of the two second antenna coils is disposed inside the display panel, and the other is disposed inside the back cover. In other embodiments, when applied to a handheld electronic device, one of the two second antenna coils is disposed inside one end of the display panel, and the other is disposed inside the other end of the display panel. In still other embodiments, when applied to a handheld electronic device, one of the two second antenna coils is disposed inside one end of the back cover, and the other is disposed inside the other end of the back cover.

[0026] In some embodiments, the aforementioned second short-range wireless transmission module is a near-field communication chip.

[0027] In summary, the handheld electronic device and its multi-antenna wireless transmission system of any embodiment have a single short-range wireless transmission module that supports multiple antenna coils. The multiple antenna coils are close to each other but do not interfere with each other, i.e., they have high isolation. Therefore, they can save power, mobile phone board area and BOM (Bill of Material) cost, and facilitate user operation. Attached Figure Description

[0028] Figure 1 This is a functional block diagram of a handheld electronic device according to an embodiment;

[0029] Figure 2 This is a functional block diagram of a handheld electronic device according to another embodiment;

[0030] Figure 3 for Figure 1 An exploded view of an example of a handheld electronic device;

[0031] Figure 4Aand Figure 4B for Figure 3 A schematic diagram of the appearance of a handheld electronic device;

[0032] Figure 5A and Figure 5B for Figure 1 A schematic diagram of the appearance of another example of a handheld electronic device;

[0033] Figure 6 for Figure 2 An exploded view of an example of a handheld electronic device;

[0034] Figure 7A and Figure 7B for Figure 6 A schematic diagram of the appearance of a handheld electronic device;

[0035] Figure 8 for Figure 2 A schematic diagram of the appearance of another example of a handheld electronic device;

[0036] Figure 9 for Figure 2 A schematic diagram of the appearance of another example of a handheld electronic device;

[0037] Figure 10 An exploded view of yet another embodiment of a handheld electronic device;

[0038] Figure 11 for Figure 10 A functional block diagram of an example of an electronic paper tag;

[0039] Figure 12 and Figure 13 for Figure 10 A schematic diagram of an example of a handheld electronic device;

[0040] Figure 14 and Figure 15 for Figure 10 A schematic diagram of an example of an electronic paper circuit board;

[0041] Figure 16 for Figure 10 A schematic diagram of an example of an electronic paper tag;

[0042] Figure 17 The circuit diagrams are for a first short-range wireless transmission module, a receiver switch circuit, and a transmitter switch circuit in some embodiments.

[0043] Figure 18 Circuit diagrams of antenna matching circuits and filtering circuits in some embodiments;

[0044] Figure 19Circuit diagrams of antenna matching circuits and filtering circuits in other embodiments;

[0045] Figure 20 A measurement diagram of the input return impedance (return loss) of the first antenna coil in the first switching state;

[0046] Figure 21 A measurement diagram of the input return impedance of the second wire coil in the second switching state;

[0047] Figure 22 This is a measurement diagram of the insertion loss of the first antenna coil and the second antenna coil.

[0048] [Symbol Explanation]

[0049] 10: Multi-antenna wireless transmission system

[0050] 20: Handheld electronic devices

[0051] 30: Electronic paper labels

[0052] 110: Antenna coil

[0053] 112: First antenna coil

[0054] 114, 116: Second day's coil

[0055] 120: Antenna driving circuit

[0056] 130: Signal transceiver circuit

[0057] 131: Receiver switching circuit

[0058] 131A, 131B: First switching unit

[0059] 133: Transmitter Switching Circuit

[0060] 133A, 133B: Second switching unit

[0061] 135: Antenna Matching Circuit

[0062] 135A: Transmit Path Circuit

[0063] 135B: Receiver Path Circuit

[0064] 137: Filtering Circuit

[0065] 140: Short-range wireless transmission module

[0066] 150, 152, 154: Magnetic substrate

[0067] 152a, 154a, 350a, 350b: Surface

[0068] 210: Shell

[0069] 211: Front cover

[0070] 211a, 384a: Display window

[0071] 213: Back cover

[0072] 213a: Opening

[0073] 215: Border

[0074] 220: Spacer

[0075] 230: Display panel

[0076] 250: Main circuit board

[0077] 270: Processing Module

[0078] 280: Electromagnetic Interference Shielding Structure

[0079] 290: Flexible flat cable

[0080] 292: Cable

[0081] 310: Induction coil

[0082] 330: Electronic Paper Display

[0083] 340: Short-range wireless transmission module

[0084] 350: Electronic paper circuit board

[0085] 360: Connection Interface

[0086] 370: Control Circuit

[0087] 380: Subshell

[0088] 382: Bracket

[0089] 384: Outer Cover

[0090] 390: Flexible ribbon cable

[0091] CP: NFC chip

[0092] C11~C16, C21~C26, Cp1, Cp2, Cs1, Cs2, Co1, Co2, Cc1, Cc2: Capacitors; SW1, SW2, SW3, SW4: Radio frequency switch chip

[0093] J1, J3: TX pins

[0094] J4, J5: RX pins; p1, p3: signal pins

[0095] H8, J8, E3, F2, p4: Control pins

[0096] p5: Shared pin

[0097] p6: Power supply pin

[0098] Prxp: Positive connection terminal

[0099] Prxn: Negative connection terminal

[0100] Ptx1: First connection end

[0101] Ptx2: Second connection terminal

[0102] Pat1: First end

[0103] Pat2: Second end

[0104] Rc1, Rc2, Rr1, Rr2, Rq1, Rq2: Resistors

[0105] Lr1, Lr2: Inductors Detailed Implementation

[0106] Reference Figure 1 A multi-antenna wireless transmission system 10 includes multiple antenna coils 110 and an antenna driving circuit 120. The antenna driving circuit 120 is coupled to the antenna coils 110. The antenna driving circuit 120 includes a signal transceiver circuit 130 and a short-range wireless transmission module 140 (hereinafter referred to as the first short-range wireless transmission module 140). The signal transceiver circuit 130 is coupled between each antenna coil 110 and the first short-range wireless transmission module 140.

[0107] Here, the first short-range wireless transmission module 140 is the core of the entire multi-antenna wireless transmission system 10, and is configured to generate radio frequency (RF) signals radiated within the short-range radiation range via any antenna coil 110 and receive RF signals within the short-range radiation range via any antenna coil 110, as well as perform signal processing on the received RF signals. In some embodiments, the short-range radiation range is less than 100 mm. In other words, the sensing distance of each antenna coil 110 is less than 100 mm.

[0108] The signal transceiver circuit 130 includes a receiver (RX) switching circuit 131, a transmitter (TX) switching circuit 133, and multiple antenna matching circuits 135. The receiver switching circuit 131 is coupled between each antenna matching circuit 135 and the first short-range wireless transmission module 140. The transmitter switching circuit 133 is coupled between each antenna matching circuit 135 and the first short-range wireless transmission module 140. Each antenna matching circuit 135 corresponds one-to-one with an antenna coil 110, and each antenna matching circuit 135 is coupled between the receiver switching circuit 131, the transmitter switching circuit 133, and the corresponding antenna coil 110.

[0109] In some embodiments, the first short-range wireless transmission module 140 includes a transmitting port and a receiving port. The transmitting port of the first short-range wireless transmission module 140 is coupled to a transmitting end switching circuit 133. The first short-range wireless transmission module 140 can output data (i.e., radio frequency signals) to the transmitting end switching circuit 133 via the transmitting port, and then transmit it to the selected antenna coil 110 among these antenna coils 110 via the transmitting end switching circuit 133 and the corresponding antenna matching circuit 135, and then radiate it out through the selected antenna coil 110. The receiving port of the first short-range wireless transmission module 140 is coupled to a receiving end switching circuit 131. The first short-range wireless transmission module 140 can receive data (i.e., radio frequency signals) within a short distance from the selected antenna coil 110 via the receiving port, the receiving end switching circuit 131 and the corresponding antenna matching circuit 135. For example, when the first short-range wireless transmission module 140 is an NFC (Near Field Communication) chip (IC), the transmitting port and the receiving port can be the TX pin and RX pin of the NFC chip, respectively. The NFC chip can be an NFC SOC (System on Chip).

[0110] The receiver switching circuit 131 is used to switch a single signal processing unit (i.e., the receiving port of the first short-range wireless transmission module 140) among multiple different transmission paths (i.e., n inputs), that is, to select different antenna coils 110 and turn on a single signal source to the selected antenna coil 110. The transmitter switching circuit 133 is used to switch a single signal processing unit (i.e., the transmitting port of the first short-range wireless transmission module 140) among multiple different transmission paths (i.e., n outputs), that is, to select different antenna coils 110 and turn on a single signal source to the selected antenna coil 110.

[0111] Each antenna matching circuit 135 is used to adjust the impedance of the signal transceiver circuit 130 to match the impedance of the antenna coil 110 in order to maximize energy transmission efficiency and reduce reflection loss, that is, reduce SWR (standing wave ratio) and / or VSWR (voltage standing wave ratio), thereby ensuring that the radio frequency signal can be efficiently transmitted to or received from the corresponding antenna coil 110.

[0112] Each antenna coil 110 is responsible for converting radio frequency signals from electrical signals in wired circuits into radio waves propagating in the air, or converting radio waves in the air into electrical signals in wired circuits.

[0113] In some embodiments, these antenna coils 110 can be used to sense different types of proximity cards using near-field communication (NFC) technology. These proximity cards can be, for example, employee ID cards, inspection cards, electronic paper tags, credit cards, electronic payment cards, or any combination thereof.

[0114] In some embodiments, the number of these antenna coils 110 may be two (e.g., Figure 1 As shown), three (as shown) Figure 2 (as shown) or more. In other words, refer to Figure 1 or Figure 2 These antenna coils 110 may include a first antenna coil 112 and at least one second antenna coil 114 (or 114, 116). Each second antenna coil 114 (or 116) is arranged with respect to the first antenna coil 112 in a different radiation direction. Specifically, the plane of arrangement of each second antenna coil 114 (or 116) has a non-zero angle with the plane of arrangement of the first antenna coil 112. In some embodiments, this angle may be 90 ± 5 degrees.

[0115] In some embodiments, refer to Figure 1 , Figure 3 , Figure 4A and Figure 4B The multi-antenna wireless transmission system 10 is applied to the handheld electronic device 20. In some embodiments, the handheld electronic device 20 may be (e.g., but not limited to) a smartphone, a PND, a digital photo frame (PDF), an e-book, a notebook computer, a tablet or pad, or an NFC and / or RFID (Radio Frequency Identification) reader.

[0116] Therefore, the handheld electronic device 20 includes the multi-antenna wireless transmission system 10 of any of the foregoing embodiments, a housing 210, a display panel 230, and a processing module 270. The housing 210 includes a back cover 213 and a frame 215. The edge of the back cover 213 is connected to the frame 215. The display panel 230 is located inside the housing 210 and adjacent to the other side of the housing 210 opposite to the back cover 213. Specifically, the housing 210 may also include a front cover 211. The front cover 211 and the back cover 213 are respectively connected to opposite sides of the frame 215 to form an accommodating space between the front cover 211, the back cover 213, and the frame 215. The display panel 230 is located in the accommodating space of the housing 210 and is disposed inside the front cover 211. Here, the display window 211a on the front cover 211 exposes the display surface of the display panel 230.

[0117] The processing module 270 and the components of the multi-antenna wireless transmission system 10 are located within the housing 210, i.e., disposed within the accommodating space. The processing module 270 is coupled to the display panel 230 and the first short-range wireless transmission module 140, and is used to control the operation of the display panel 230 and the first short-range wireless transmission module 140. For example, the processing module 270 controls the display panel 230 to display (e.g., whether to display or not, and switching of display images), and controls the first short-range wireless transmission module 140 to transmit or receive radio frequency signals. In some embodiments, the processing module 270 is also coupled to the receiver switching circuit 131 and the transmitter switching circuit 133 to control the operation of the receiver switching circuit 131 and the transmitter switching circuit 133. For example, the processing module 270 also controls the conduction and switching of the conduction path of the receiver switching circuit 131, and controls the conduction and switching of the conduction path of the transmitter switching circuit 133. In some embodiments, the processing module 270 is electrically connected to the display panel 230 via a flexible flat cable 290.

[0118] In some embodiments, refer to Figure 1 Taking a multi-antenna wireless transmission system 10 with a first antenna coil 112 and a second antenna coil 114 as an example. In this case, the first antenna coil 112 is disposed on the inner side of one side of the frame 215, such as... Figure 3 , Figure 4A , Figure 4B , Figure 5A and Figure 5B As shown. In one example, this second antenna coil 114 may be disposed on the inside of the display panel 230 (i.e., on the other side of the display panel 230 opposite to the front cover 211), as... Figure 3 and Figure 4A As shown. In another example, this second antenna coil 114 can be disposed inside the back cover 213, as shown. Figure 5BAs shown. For example, when the multi-antenna wireless transmission system 10 has a first antenna coil 112 and a second antenna coil 114, the first antenna coil 112 is disposed on the inside of one side of the frame 215, and the second antenna coil 114 can be disposed on the inside of the back cover 213, the first antenna coil 112 can be used to sense employee ID cards and / or inspection cards, while the second antenna coil 114 is used to sense electronic paper tags.

[0119] In some embodiments, with the housing 210 having six inner surfaces, the frame 215 has an upper side (i.e., the upper surface of the housing 210), a lower side (i.e., the lower surface of the housing 210), a left side (i.e., the left side surface of the housing 210), and a right side (i.e., the right side surface of the housing 210). The left side is coupled between one end of the upper side and one end of the lower side, and the right side is coupled between the other end of the upper side and the other end of the lower side. In one exemplary embodiment, refer to... Figure 3 , Figure 4A and Figure 4B The first antenna coil 112 may be located inside the housing 210 and disposed adjacent to the upper side edge of the frame 215 and along the inner surface of the upper side edge of the frame 215. The second antenna coil 114 is located inside the housing 210 and disposed adjacent to the display panel 230. In another example, see... Figure 5A and Figure 5B The first antenna coil 112 may be located inside the housing 210 and is disposed adjacent to the upper side of the frame 215 and along the inner surface of the upper side of the frame 215. The second antenna coil 114 is located inside the housing 210 and is disposed adjacent to the back cover 213 and along the inner surface of the back cover 213 (i.e., the rear surface of the housing 210).

[0120] In other embodiments, reference is made to Figure 2 Taking a multi-antenna wireless transmission system 10 with a first antenna coil 112 and two second antenna coils 114 and 116 as an example. In this case, the first antenna coil 112 is disposed on the inner side of one side of the frame 215, such as... Figure 6 , Figure 7A , Figure 7B , Figure 8 and Figure 9 As shown. In one example, the second antenna coils 114 and 116 can be respectively disposed on the inner side of the display panel 230 and the inner side of the back cover 213, as shown. Figure 3 , Figure 7A and Figure 7B As shown. In another example, the second antenna coils 114 and 116 are both disposed inside the display panel 230, as shown. Figure 8 As shown. (Refer to...) Figure 8One second antenna coil 114 may be disposed at one end of the inner side of the display panel 230, and another second antenna coil 116 may be disposed at the other end of the inner side of the display panel 230. In some other embodiments, both second antenna coils 114 and 116 are disposed on the inner side of the back cover 213, such as... Figure 9 As shown. (Refer to...) Figure 9 A second secondary antenna coil 114 may be disposed at one end of the inner side of the back cover 213, and another second secondary antenna coil 116 may be disposed at the other end of the inner side of the back cover 213 (e.g., between the back cover 213 and the battery).

[0121] In some embodiments, when the multi-antenna wireless transmission system 10 has a first antenna coil 112 and two second antenna coils 114, 116, the first antenna coil 112 can be used to sense employee ID cards and / or inspection cards, the second antenna coil 114 can be used to sense credit cards and / or electronic payment cards, and the second antenna coil 116 can be used to sense electronic paper tags.

[0122] In some embodiments, the multi-antenna wireless transmission system 10 may further include a plurality of magnetically conductive substrates 150. These magnetically conductive substrates 150 correspond to a plurality of antenna coils 110. Each antenna coil 110 is disposed on its corresponding magnetically conductive substrate 150. For example, each antenna coil 110 is formed on its corresponding magnetically conductive substrate 150, and the magnetically conductive substrate 150 is then fixed to the inside of the housing 210. That is, each antenna coil 110 is sandwiched between the housing 210 and its corresponding magnetically conductive substrate 150.

[0123] In some embodiments, refer to Figure 1 and Figure 3 (or refer to) Figure 2 and Figure 6 The first antenna coil 112 corresponds to one of the magnetic substrates 150, namely a magnetic substrate 152, and is formed on the surface of the corresponding magnetic substrate 152. At least one second antenna coil 114 (or 114, 116) corresponds to at least one of the magnetic substrates 150, namely a magnetic substrate 154, and is formed on the surface of the corresponding magnetic substrate 154.

[0124] Specifically, taking a multi-antenna wireless transmission system 10 having a first antenna coil 112 and a second antenna coil 114 as an example, the first antenna coil 112 is formed on a corresponding magnetic substrate 152, and the magnetic substrate 152 on which the first antenna coil 112 is formed is fixed to the inner side of one side of the frame 215, such that the first antenna coil 112 is sandwiched between the side of the frame 215 and the corresponding magnetic substrate 152. The second antenna coil 114 is formed on a corresponding magnetic substrate 154, and the magnetic substrate 154 on which the second antenna coil 114 is formed is fixed to the inner side of the display panel 230, such that the second antenna coil 114 is sandwiched between the display panel 230 and the corresponding magnetic substrate 154.

[0125] In some embodiments, refer to Figure 2 and Figure 8 (or refer to) Figure 2 and Figure 9 When the multi-antenna wireless transmission system 10 has two second antenna coils 114 and both second antenna coils 114 are disposed inside the display panel 230 (or inside the back cover 213), the two second antenna coils 114 can be formed on two independent magnetic substrates 150 (not shown), and the magnetic substrate 150 having the second antenna coil 114 is fixed to the inside of the display panel 230. In other embodiments, the two second antenna coils 114 can be formed on the same magnetic substrate 150 (not shown).

[0126] In some embodiments, refer to Figure 1 or Figure 2 The receiver switching circuit 131 includes a plurality of first switching units 131A and 131B. The plurality of input terminals of each first switching unit 131A (or 131B) are respectively coupled to the antenna matching circuits 135, and the output terminal of each first switching unit 131A (or 131B) is coupled to the first short-range wireless transmission module 140. In some embodiments, when the multi-antenna wireless transmission system 10 is applied to the handheld electronic device 20, the control terminal of each first switching unit 131A (or 131B) is coupled to and controlled by the processing module 270. In other words, the processing module 270 can control the path energized by each first switching unit 131A (or 131B) according to the operational requirements of the handheld electronic device 20, so that the first short-range wireless transmission module 140 is energized to the selected antenna coil 110 via one of the first switching units 131A and 131B, and then receives radio frequency signals via the energized antenna coil 110. In some embodiments, each of the first switching units 131A, 131B may be a single-pole n-throw switch. n is related to the number of antenna coils 110, that is, a positive integer of 2 or more. In some embodiments, n may be equal to the number of antenna coils 110.

[0127] In some embodiments, the transmitter switching circuit 133 includes a plurality of second switching units 133A, 133B. The plurality of output terminals of each second switching unit 133A (or 133B) are electrically connected to a plurality of antenna matching circuits 135, and an input terminal of each second switching unit 133A (or 133B) is coupled to a first short-range wireless transmission module 140. In some embodiments, when the multi-antenna wireless transmission system 10 is applied to a handheld electronic device 20, the control terminal of each second switching unit 133A (or 133B) is coupled to and controlled by the processing module 270. In other words, the processing module 270 can control the path energized by each second switching unit 133A (or 133B) according to the operational requirements of the handheld electronic device 20, so that the first short-range wireless transmission module 140 is energized to a selected antenna coil 110 via one of the second switching units 133A, 133B, and then transmits radio frequency signals via the energized antenna coil 110. In some embodiments, each of the second switching units 133A, 133B may be a single-pole n-thow switch. n is the number of antenna coils 110, i.e., a positive integer of 2 or greater. In some embodiments, n may be equal to the number of antenna coils 110.

[0128] In some embodiments, the multi-antenna wireless transmission system 10 may further include multiple filtering circuits 137. These filtering circuits 137 correspond to antenna matching circuits 135 respectively. In other words, the filtering circuit 137 corresponds one-to-one with the antenna matching circuit 135. Each filtering circuit 137 is coupled between each of the second switching units 133A, 133B of the transmitting end switching circuit 133 and the corresponding antenna matching circuit 135, and is configured to suppress or filter noise in the radio frequency signal. In some embodiments, each filtering circuit 137 may be an electromagnetic compatibility filter (EMC filter) and is used to suppress or filter noise and unwanted frequency components in the radio frequency signal to ensure that the signal complies with electromagnetic compatibility (EMC) standards, thereby reducing interference to other electronic components.

[0129] In some embodiments, refer to Figure 3 and Figure 6 The multi-antenna wireless transmission system 10 may also include an electromagnetic interference shielding structure 280. This electromagnetic interference shielding structure 280 is located within the housing 210 and serves to isolate the multiple antenna coils 110 from the antenna drive circuit 120 (i.e., multiple antenna matching circuits 135, the first short-range wireless transmission module 140, the receiver switching circuit 131, and the transmitter switching circuit 133). Specifically, the electromagnetic interference shielding structure 280 may be disposed between the antenna coils 110 and the antenna drive circuit 120.

[0130] In some embodiments, when the multi-antenna wireless transmission system 10 is applied to a handheld electronic device 20, the electromagnetic interference shielding structure 280 can simultaneously isolate multiple antenna coils 110 from the processing module 270. Specifically, the electromagnetic interference shielding structure 280 can be disposed between the antenna coils 110 and the antenna driving circuit 120, and also between the antenna coils 110 and the processing module 270. For example, the electromagnetic interference shielding structure 280 can be a metal cover, and this metal cover covers the antenna driving circuit 120 and the processing module 270 to isolate the antenna coils 110. In some embodiments, the metal cover can be, for example, aluminum foil.

[0131] In some embodiments, the handheld electronic device 20 may also include a main circuit board 250. The antenna driving circuit 120 (i.e., multiple antenna matching circuits 135, a first short-range wireless transmission module 140, a receiver switching circuit 131, and a transmitter switching circuit 133) and the processing module 270 are disposed on this main circuit board 250. In some embodiments, when the multi-antenna wireless transmission system 10 is provided with an electromagnetic interference shielding structure 280, the electromagnetic interference shielding structure 280 may cover not only the antenna driving circuit 120 and the processing module 270, but also the main circuit board 250.

[0132] In some embodiments, refer to Figure 1 , Figure 10 and Figure 11 The multi-antenna wireless transmission system 10 may also include an electronic paper tag 30. This electronic paper tag 30 may be matched with at least one of the second antenna coils 114 (or 114, 116) and communicate wirelessly with the matched second antenna coil 114.

[0133] In some embodiments, refer to Figure 1 and Figures 10 to 13 The electronic paper tag 30 can be disposed on the back cover 213 of the handheld electronic device 20. In this case, the second antenna coil 114, which matches the electronic paper tag 30, can be located on the inner side of the back cover 213 corresponding to the position of the electronic paper tag 30, and positioned on the side adjacent to the back cover 213 relative to the front cover 211 (or display panel 230). In other words, the front cover 211 of the handheld electronic device 20 exposes the display surface of the display panel 230, and the back cover 213 exposes the display surface of the electronic paper tag 30.

[0134] In some embodiments, refer to Figure 10 and Figure 11 The electronic paper tag 30 includes an induction coil 310, an electronic paper display 330, a short-range wireless transmission module 340 (hereinafter referred to as the second short-range wireless transmission module 340), and an electronic paper circuit board 350.

[0135] The electronic paper display 330 has a display surface. Specifically, the electronic paper display 330 has two opposing surfaces (hereinafter referred to as the first surface and the second surface), and the first surface is the display surface of the electronic paper display 330.

[0136] The electronic paper circuit board 350 is located on the opposite side of the electronic paper display 330 from its display surface and is electrically connected to the electronic paper display 330. Specifically, the electronic paper circuit board 350 has two opposing surfaces 350a and 350b (hereinafter referred to as the third surface 350a and the fourth surface 350b), such as... Figure 14 and Figure 15 As shown. (Refer to...) Figure 10 , Figure 11 , Figure 14 and Figure 15 The electronic paper circuit board 350 is located adjacent to the second surface on one side of the electronic paper display 330, relative to the first surface. Furthermore, the third surface 350a of the electronic paper circuit board 350 faces the second surface of the electronic paper display 330. In some embodiments, the electronic paper circuit board 350 can be electrically connected to the electronic paper display 330 via a flexible flat cable 390 (or connecting cable). Specifically, the electronic paper circuit board 350 has a control circuit 370 and a connection interface 360, and the control circuit 370 is electrically connected to the connection interface 360. One end of the flexible flat cable 390 is coupled to the connection interface 360, and the other end of the flexible flat cable 390 is coupled to the electronic paper display 330.

[0137] An induction coil 310 is located on the surface of the electronic paper circuit board 350 opposite to the electronic paper display 330 and is electrically coupled to at least one second antenna coil 114 (or 114, 116) that matches the electronic paper tag 30. A second short-range wireless transmission module 340 is disposed on the electronic paper circuit board 350 and coupled to the induction coil 310. Therefore, the handheld electronic device 20 can provide energy to the electronic paper tag 30 through magnetic induction generated by the second antenna coil 114 and the induction coil 310. Specifically, the control circuit 370 is also electrically connected to the second short-range wireless transmission module 340. When switching the display screen of the electronic paper display 330, the processing module 270 can control the first short-range wireless transmission module 140 to transmit a signal via the second antenna coil 114. At this time, the second short-range wireless transmission module 340 on the electronic paper circuit board 350 senses the signal transmitted by the second antenna coil 114 via the induction coil 310 to obtain the corresponding energy as the power required by each component of the electronic paper tag 30 during operation. This allows the control circuit 370 to convert the data into a communication protocol and write it into the electronic paper display 330, so that the electronic paper display 330 displays a screen that presents this communication protocol. In some embodiments, the data transmits the electronic paper display instruction to the electronic paper tag 30 and displays it via the ISO14443A protocol. In some embodiments, the second short-range wireless transmission module 340 can be an NFC chip. The NFC chip can be an NFC SOC. In some embodiments, the second short-range wireless transmission module 340 and the MCU (microcontroller unit) in the control circuit 370 can be implemented by the same controller chip with NFC functionality.

[0138] In this way, when the multi-antenna wireless transmission system 10 combined with the electronic paper tag 30 is applied to the handheld electronic device 20 (taking an NFC reader as an example), the NFC reader can generate an alternating magnetic field at 13.56MHz, causing the induction coil 310 in the passive electronic paper tag 30 to extract RF energy through inductive coupling and convert the RF energy into DC power through rectification and voltage regulation circuits and store it in energy storage elements (such as supercapacitors) to serve as the power source for subsequently driving the electronic paper display 330 to display (i.e., refresh and switch the display screen).

[0139] Furthermore, after the NFC reader and the electronic paper tag 30 complete the detection and selection according to the ISO15693 or ISO14443 standard, the text or image data to be displayed is written into the memory (such as EEPROM) on the electronic paper tag 30 or the buffer built into the MCU in the control circuit 370 through APDU or NDEF format; during this process, the RF magnetic field can continuously provide power until the data transmission is completed.

[0140] Furthermore, the ultra-low-power MCU (such as the STM8L series) inside the electronic paper tag 30, after receiving power from the supercapacitor, can drive the display driver IC of the electronic paper display 330 to generate high-voltage waveforms (such as VCOM and segment / column voltages) according to the received display instructions, so that the electronic paper display 330 executes the electronic paper refresh sequence. Since the electronic paper display 330 uses bistable technology, it only requires tens of milliamps of current in the millisecond range during the refresh moment, and immediately enters deep sleep after the refresh is completed, thus reducing power consumption to the microamp level.

[0141] Furthermore, once the screen refreshes, the e-paper display 330 can continuously display the refreshed image without any external power supply, and can remain powered on for weeks or months. Therefore, the e-paper tag 30 consumes almost no energy except for the moment of update, making it ideal for Internet of Things (IoT) scenarios that require long-term display and where battery replacement is inconvenient.

[0142] In some embodiments, refer to Figure 14 and Figure 15 The second short-range wireless transmission module 340 is mounted on the third surface 350a of the electronic paper circuit board 350, and the induction coil 310 is formed on the fourth surface 350b of the electronic paper circuit board 350. The second short-range wireless transmission module 340 and the induction coil 310 can be electrically connected through a through hole (not shown) formed on the electronic paper circuit board 350 or through a through hole and circuit trace (not shown) formed on the electronic paper circuit board 350.

[0143] In some embodiments, refer to Figure 1 , Figure 10 , Figure 11 , Figure 12 , Figure 13 and Figure 16The multi-antenna wireless transmission system 10 may also include a spacer 220. Here, the multi-antenna wireless transmission system 10 has at least one magnetic substrate 150, and one of the magnetic substrates 150, a magnetic substrate 154, corresponds to the second antenna coil 114. The spacer 220 is coupled between the electronic paper circuit board 350 and the magnetic substrate 154, and serves to ensure the spacing between the electronic paper circuit board 350 and the magnetic substrate 154. In other words, the electronic paper circuit board 350 and the magnetic substrate 154 are respectively located on opposite sides of the spacer 220. The second antenna coil 114 is formed on the surface 154a of the magnetic substrate 154. The second antenna coil 114 may be formed on the surface 154a of the magnetic substrate 154 facing the spacer 220 (or the electronic paper circuit board 350), and electrically connected to a cable 292 through a through-hole in the magnetic substrate 154, such that the second antenna coil 114 is electrically connected to the antenna drive circuit 120 on the main circuit board 250 via the cable 292. In some embodiments, the spacer 220 may be an elastic interlayer. In some embodiments, the elastic interlayer may be made of foam. In some embodiments, the distance between the electronic paper circuit board 350 and the magnetic substrate 154 may fall within a distance that allows the induction coil 310 and the second antenna coil 114 to couple and sense each other while avoiding unintended interference between them. In some embodiments, the distance between the electronic paper circuit board 350 and the magnetic substrate 154 is greater than or equal to 20 mm and less than 100 mm. In some embodiments, the distance between the electronic paper circuit board 350 and the magnetic substrate 154 may be between 20 mm and 30 mm. For example, if the spacer 220 is a foam interlayer, the thickness of this foam interlayer may be between 20 mm and 30 mm.

[0144] In one example, the number of at least one magnetic substrate 150 is one, i.e., the multi-antenna wireless transmission system 10 has a single magnetic substrate 154. In another example, the number of at least one magnetic substrate 150 is two or more. Taking the multi-antenna wireless transmission system 10 having two antenna coils 110 (i.e., a first antenna coil 112 and a second antenna coil 114) as an example, the number of at least one magnetic substrate 150 can be two, namely a magnetic substrate 152 and a magnetic substrate 154. The first antenna coil 112 is formed on the surface 152a of the magnetic substrate 152, such that the first antenna coil 112 is located between the magnetic substrate 152 and the frame 215 of the handheld electronic device 20. The second antenna coil 114 is formed on the surface 154a of the magnetic substrate 154, such that the second antenna coil 114 is located between the magnetic substrate 154 and the spacer 220. For example, taking the spacer 220 as an elastic interlayer, the fourth surface 350b of the electronic paper circuit board 350 and the surface 154a of the magnetic substrate 154 are respectively attached to the two opposing surfaces of the elastic interlayer. Therefore, the induction coil 310 is sandwiched between the electronic paper circuit board 350 and the elastic interlayer, and the second antenna coil 114 is sandwiched between the elastic interlayer and the magnetic substrate 154, and the position of the induction coil 310 corresponds to the position of the second antenna coil 114.

[0145] In some embodiments, refer to Figures 10 to 13 The handheld electronic device 20 may also include a sub-housing 380 for assembling the electronic paper tag 30. The sub-housing 380 includes a bracket 382. The bracket 382 is located between the electronic paper display 330 and the electronic paper circuit board 350, and is used to fix the electronic paper display 330. Specifically, the electronic paper display 330 and the electronic paper circuit board 350 are assembled on the bracket 382 and then fixed to the housing 210 of the handheld electronic device 20 via the bracket 382.

[0146] For example, the back cover 213 of the handheld electronic device 20 has an opening 213a. A bracket 382 is located on the opening 213a and assembled (fixed) on the outside of the back cover 213 to fix (e.g., lock) the electronic paper display 330 to the housing 210 of the handheld electronic device 20.

[0147] In some embodiments, the sub-housing 380 may further include an outer cover 384. Here, the outer cover 384 is coupled to the bracket 382 to form an accommodating space between them, in which the electronic paper display 330 is located. In other words, the electronic paper display 330 is sandwiched between the outer cover 384 and the bracket 382. In some embodiments, the outer cover 384, together with the bracket 382, ​​can be locked to the back cover 213 using locking elements (such as screws). In some embodiments, the outer cover 384 has a display window 384a. When the outer cover 384, together with the bracket 382, ​​is locked to the back cover 213, the display window 384a exposes the display surface of the electronic paper display 330.

[0148] In some embodiments, taking a multi-antenna wireless transmission system 10 having two antenna coils 110 (i.e., a first antenna coil 112 and a second antenna coil 114) as an example, refer to... Figure 1 and Figure 17 The first short-range wireless transmission module 140 can be an NFC chip CP. The receiver switching circuit 131 includes two first switching units 131A and 131B and circuit traces coupling the first switching units 131A and 131B to other components, and the two first switching units 131A and 131B can be two radio frequency switch chips SW1 and SW2. The transmitter switching circuit 133 includes two second switching units 133A and 133B and circuit traces coupling the second switching units 133A and 133B to other components, and the two second switching units 133A and 133B can be two radio frequency switch chips SW3 and SW4.

[0149] The RX pin J5 of the NFC chip CP is coupled to the common pin p5 of the RF switch chip SW1 via a capacitor and is used to receive the positive RF signal. The RX pin J4 of the NFC chip CP is coupled to the common pin p5 of the RF switch chip SW2 and is used to receive the negative RF signal. The two signal pins p1 and p3 of the RF switch chip SW1 are coupled to the two positive connection terminals Prxp, and these two positive connection terminals Prxp are coupled one-to-one to the antenna matching circuit 135 corresponding to the two antenna coils 110. The two signal pins p1 and p3 of the RF switch chip SW2 are coupled to the two negative connection terminals Prxn, and these two negative connection terminals Prxn are coupled one-to-one to the antenna matching circuit 135 corresponding to the two antenna coils 110. The power supply pin p6 of the RF switch chips SW1 and SW2 is coupled to the power supply, and the control pin p4 of the RF switch chips SW1 and SW2 is coupled to the processing module 270 of the handheld electronic device 20.

[0150] The TX pin J1 of the NFC chip CP is coupled to the common pin p5 of the RF switch chip SW3 and is used to generate an RF signal. The TX pin J3 of the NFC chip CP is coupled to the common pin p5 of the RF switch chip SW4 and is used to generate another RF signal. The two signal pins p1 and p3 of the RF switch chip SW3 are respectively coupled to two first connection terminals Ptx1, and these two first connection terminals Ptx1 are coupled one-to-one to the filter circuit 137 corresponding to the two antenna coils 110. The two signal pins p1 and p3 of the RF switch chip SW4 are respectively coupled to two second connection terminals Ptx2, and these two second connection terminals Ptx2 are coupled one-to-one to the filter circuit 137 corresponding to the two antenna coils 110. The power supply pin p6 of the RF switch chips SW3 and SW4 is coupled to the power supply, and the control pin p4 of the RF switch chips SW3 and SW4 is coupled to the processing module 270 of the handheld electronic device 20.

[0151] The power supply pin p6 of the NFC chip CP is coupled to the power supply, and the control pins H8, J8, E3, and F2 of the NFC chip CP are coupled to the processing module 270 of the handheld electronic device 20.

[0152] In some embodiments, the NFC chip CP can be an RF chip such as NXP SN110T, PN7160, CLRC663, ST25R3916B, or ST25R3911B, and the RF switch chips SW1, SW2, SW3, and SW4 can be switch chips such as NJG1801K75-TE1, QM12312, or RTC86102FU. The switch chips can be, for example, single-pole double-throw (SPDT) switch chips.

[0153] In some embodiments, refer to Figure 18 Or refer to Figure 19 Each antenna matching circuit 135 may include a transmit path circuit 135A and a receive path circuit 135B.

[0154] In one example, refer to Figure 17 and Figure 18Each antenna matching circuit 135's transmit path circuit 135A includes multiple capacitors C11-C16 and C21-C26. Capacitors C11 and C12 are coupled between the first terminal Pat1 of the corresponding antenna coil 110 and ground. Capacitors C21 and C22 are coupled between the second terminal Pat2 of the corresponding antenna coil 110 and ground. Capacitors C13 and C14 are connected in parallel between the first terminal Pat1 of the corresponding antenna coil 110 and the corresponding filter circuit 137. In other words, the first terminals of capacitors C13 and C14 are coupled to the first terminal Pat1 of the corresponding antenna coil 110, while the second terminals of capacitors C13 and C14 are coupled to the corresponding filter circuit 137. Capacitors C15 and C16 are coupled between the second terminals of capacitors C13 and C14 and ground. Capacitors C23 and C24 are connected in parallel between the second terminal Pat2 of the corresponding antenna coil 110 and the corresponding filter circuit 137. In other words, the first terminals of capacitors C23 and C24 are coupled to the second terminal Pat2 of the corresponding antenna coil 110, while the second terminals of capacitors C23 and C24 are coupled to the corresponding filter circuit 137. Capacitors C25 and C26 are coupled between the second terminals of capacitors C23 and C24 and ground.

[0155] The receive path circuit 135B of each antenna matching circuit 135 includes multiple resistors Rc1 and Rc2. Resistor Rc1 is coupled between the first terminal Pat1 of the corresponding antenna coil 110 and each negative connection terminal Prxn. In other words, the first terminal of resistor Rc1 is coupled to the first terminal Pat1 of the corresponding antenna coil 110, and the second terminal of resistor Rc1 is coupled to the negative connection terminal Prxn to which all RF switch chips SW1 and SW2 are coupled. Resistor Rc2 is coupled between the second terminal Pat2 of the corresponding antenna coil 110 and each positive connection terminal Prxp. In other words, the first terminal of resistor Rc2 is coupled to the second terminal Pat2 of the corresponding antenna coil 110, and the second terminal of resistor Rc2 is coupled to the positive connection terminal Prxp to which all RF switch chips SW1 and SW2 are coupled.

[0156] Each filter circuit 137 includes resistors Rr1 and Rr2, and inductors Lr1 and Lr2. Resistor Rr1 is coupled between the second terminals of capacitors C13 and C14 and the second terminal of resistor Rc2. Resistor Rr2 is coupled between the second terminals of capacitors C23 and C24 and the second terminal of resistor Rc1. Inductor Lr1 is coupled between the second terminals of capacitors C13 and C14 and each first connection terminal Ptx1. In other words, the first terminal of inductor Lr1 is coupled to the second terminals of capacitors C13 and C14, and the second terminal of inductor Lr1 is coupled to the first connection terminal Ptx1 to which all RF switch chips SW3 and SW4 are coupled. Inductor Lr2 is coupled between the second terminals of capacitors C23 and C24 and each second connection terminal Ptx2. In other words, the first end of inductor Lr2 is coupled to the second end of capacitors C23 and C24, and the second end of inductor Lr2 is coupled to the second connection terminal Ptx2 to which all RF switch chips SW3 and SW4 are coupled.

[0157] In another example, refer to Figure 17 and Figure 19 Each antenna matching circuit 135's transmit path circuit 135A includes multiple capacitors Cp1, Cp2, Cs1, Cs2, Co1, Co2 and resistors Rq1, Rq2. Resistor Rq1 and capacitor Cs1 are connected in series between the first terminal Pat1 of the corresponding antenna coil 110 and the corresponding filter circuit 137. In other words, the first terminal of resistor Rq1 is coupled to the first terminal Pat1 of the corresponding antenna coil 110, and the second terminal of resistor Rq1 is coupled to the first terminal of capacitor Cs1. The second terminal of capacitor Cs1 is coupled to the corresponding filter circuit 137. Capacitor Cp1 is coupled between the first terminal Pat1 of the corresponding antenna coil 110 and ground; specifically, the first terminal of capacitor Cp1 is coupled to the second terminal of resistor Rq1, and the second terminal of capacitor Cp1 is coupled to ground. Capacitor Co1 is coupled between the second terminal of capacitor Cs1 and ground. Resistor Rq2 and capacitor Cs2 are connected in series between the second terminal Pat2 of the corresponding antenna coil 110 and the corresponding filter circuit 137. In other words, the first terminal of resistor Rq2 is coupled to the second terminal Pat2 of the corresponding antenna coil 110, and the second terminal of resistor Rq2 is coupled to the first terminal of capacitor Cs2. The second terminal of capacitor Cs2 is coupled to the corresponding filter circuit 137. Capacitor Cp2 is coupled between the second terminal Pat2 of the corresponding antenna coil 110 and ground; specifically, the first terminal of capacitor Cp2 is coupled to the second terminal of resistor Rq2, and the second terminal of capacitor Cp2 is coupled to ground. Capacitor Co2 is coupled between the second terminal of capacitor Cs2 and ground.

[0158] The receiving path circuit 135B of each antenna matching circuit 135 includes multiple resistors Rc1, Rc2 and capacitors Cc1, Cc2. Resistor Rc1 and capacitor Cc1 are connected in series between the first terminal Pat1 of the corresponding antenna coil 110 and each negative connection terminal Prxn. In other words, the first terminal of resistor Rc1 is coupled to the first terminal Pat1 of the corresponding antenna coil 110, and the second terminal of resistor Rc1 is coupled to the first terminal of capacitor Cc1. The second terminal of capacitor Cc1 is then coupled to the negative connection terminal Prxn to which all RF switch chips SW1, SW2 are coupled. Resistor Rc2 and capacitor Cc2 are connected in series between the second terminal Pat2 of the corresponding antenna coil 110 and each positive connection terminal Prxp. In other words, the first terminal of resistor Rc2 is coupled to the second terminal Pat2 of the corresponding antenna coil 110, and the second terminal of resistor Rc2 is coupled to the first terminal of capacitor Cc2. The second end of capacitor Cc2 is coupled to the positive connection terminal Prxp of all RF switch chips SW1 and SW2.

[0159] Each filter circuit 137 includes resistors Rr1 and Rr2, and inductors Lr1 and Lr2. Resistor Rr1 is coupled between the second terminal of capacitor Cs1 and the second terminal of resistor Rc1. Resistor Rr2 is coupled between the second terminal of capacitor Cs2 and the second terminal of resistor Rc1. Inductor Lr1 is coupled between the second terminal of capacitor Cs1 and each first connection terminal Ptx1. In other words, the first terminal of inductor Lr1 is coupled to the second terminal of capacitor Cs1, and the second terminal of inductor Lr1 is coupled to the first connection terminal Ptx1 to which all RF switch chips SW3 and SW4 are coupled. Inductor Lr2 is coupled between the second terminal of capacitor Cs2 and each second connection terminal Ptx2. In other words, the first terminal of inductor Lr2 is coupled to the second terminal of capacitor Cs2, and the second terminal of inductor Lr2 is coupled to the second connection terminal Ptx2 to which all RF switch chips SW3 and SW4 are coupled.

[0160] In some embodiments, with Figure 10 , Figure 12 and Figure 13 The handheld electronic device 20 shown was tested. The handheld electronic device 20 can be an NFC / RFID reader. This handheld electronic device 20 has... Figure 1 and Figure 11 The multi-antenna wireless transmission system 10 shown employs... Figure 17 and Figure 18 The circuit architecture shown.

[0161] When reading various types of NFC-enabled proximity cards, the reading distance (i.e. the maximum distance at which data can be read from the proximity card) between the first antenna coil 112 and the second antenna coil 114 is shown in Table 1.

[0162] Table 1

[0163]

[0164] With both the transmit and receive ports of the first short-range wireless transmission module 140 connected to the first antenna coil 112 but the second antenna coil 114 disconnected, measurements using a vector network analyzer (VNA) show that the frequency of the first antenna coil 112 is 13.56MHz and its impedance is 15.2Ω. Figure 20 As shown.

[0165] With both the transmit and receive ports of the first short-range wireless transmission module 140 connected to the second antenna coil 114 but the first antenna coil 112 disconnected, measurements using a vector network analyzer show that the frequency of the second antenna coil 114 is 13.56MHz and its impedance is 32.629Ω. Figure 21 As shown.

[0166] As can be seen from the aforementioned tests, the multi-antenna wireless transmission system 10 can have high output power, match the low impedance NFC chip port, improve energy transmission efficiency, reduce coil loss, improve Q value and sensing distance, and meet the resonance matching conditions.

[0167] Next, with both the transmitting and receiving ports of the first short-range wireless transmission module 140 connected to the first antenna coil 112 but the second antenna coil 114 disconnected, an antenna isolation test of the handheld electronic device 20 is performed, and the test results are as follows: Figure 22 As shown. Therefore, the lower the insertion loss of the first antenna coil 112 when it is disconnected, the better the isolation effect. Figure 22 It can be seen that the handheld electronic device 20 has an isolation (i.e., insertion loss) of -27.434dB at a bandwidth of 13.56MHz. In other words, the antenna isolation effect of the multi-antenna wireless transmission system 10 meets the industry standard, that is, it has a very good antenna isolation effect.

[0168] In some embodiments, the processing module 270 is configured to process and execute programs and signals of exemplary embodiments, and can access or load data and software recorded in the storage module. In some embodiments, the aforementioned processing module 270 may consist of one or more processing units. Each processing unit may be, for example, a microprocessor, microcontroller, digital signal processor (DSP), central processing unit (CPU), programmable logic controller (PLC), application-specific integrated circuit (ASIC), field-programmable gate array (FPGA), or finite-state machine (FSM). In some embodiments, the processing module may be implemented by an integrated circuit (IC), system-on-a-chip (SoC), or any analog and / or digital device based on operation instructions operating signals.

[0169] In summary, the handheld electronic device 20 and its multi-antenna wireless transmission system 10 of any embodiment have a single short-range wireless transmission module 140 supporting multiple antenna coils 110, and the multiple antenna coils 110 are close to each other but do not interfere with each other, i.e., they have high isolation, thus saving power, mobile phone board area and BOM (Bill of Material) costs, and making it convenient for users to operate.

Claims

1. A handheld electronic device, characterized in that, include: A housing includes a back cover and a frame, wherein the back cover is connected to the frame. A display panel is located inside the housing and adjacent to the other side of the housing opposite the back cover. A processing module is located inside the housing and coupled to the display panel; Multiple antenna coils, located within the housing, include: A first antenna coil is disposed inside the frame; and At least one second antenna coil is disposed on the inside of the display panel or the inside of the back cover; Multiple antenna matching circuits are located inside the housing and correspond to the multiple antenna coils respectively. Each antenna matching circuit is coupled to the corresponding antenna coil. A first short-range wireless transmission module is located inside the housing and coupled to the processing module; A receiver switching circuit, located within the housing, is coupled between each of the antenna matching circuits and the first short-range wireless transmission module; and A transmitter switch circuit is located inside the housing and coupled between each of the antenna matching circuits and the first short-range wireless transmission module.

2. The handheld electronic device as described in claim 1, characterized in that, Also includes: Multiple filter circuits are located within the housing and correspond to the multiple antenna matching circuits respectively. Each filter circuit is coupled between the transmitter switching circuit and the corresponding antenna matching circuit and is configured to suppress or filter noise in the radio frequency signal.

3. The handheld electronic device as described in claim 1, characterized in that, Also includes: An electromagnetic interference shielding structure is located inside the housing to isolate the plurality of antenna coils from the plurality of antenna matching circuits, the first short-range wireless transmission module, the receiver switching circuit, and the transmitter switching circuit.

4. The handheld electronic device as claimed in claim 1, characterized in that, Also includes: Multiple magnetically conductive substrates are located inside the housing and correspond to the multiple antenna coils, wherein each of the magnetically conductive substrates is disposed on the opposite side of the housing relative to the corresponding antenna coil.

5. The handheld electronic device as claimed in claim 1, characterized in that, The plane of the second antenna coil has an angle with the plane of the first antenna coil, and the angle is 90 ± 5 degrees.

6. The handheld electronic device as claimed in claim 1, characterized in that, The first short-range wireless transmission module is a near-field communication chip.

7. The handheld electronic device as claimed in claim 1, characterized in that, The sensing distance of each antenna coil is less than 100 mm.

8. The handheld electronic device as claimed in claim 1, characterized in that, The receiver switching circuit includes multiple first switching units, with multiple input terminals of each first switching unit respectively coupled to the multiple antenna matching circuits, an output terminal of each first switching unit coupled to the first short-range wireless transmission module, and a control terminal of each first switching unit coupled to the processing module.

9. The handheld electronic device as claimed in claim 8, characterized in that, The transmitter switching circuit includes multiple second switching units, with multiple output terminals of each second switching unit electrically connected to the multiple antenna matching circuits, an input terminal of each second switching unit coupled to the first short-range wireless transmission module, and a control terminal of each second switching unit coupled to the processing module.

10. The handheld electronic device as claimed in claim 9, characterized in that, The number of the second-day coil should be at least one.

11. The handheld electronic device as claimed in claim 9, characterized in that, The number of at least one second antenna coil is two, one of which is disposed on the inner side of the display panel, and the other of which is disposed on the inner side of the back cover.

12. The handheld electronic device as claimed in claim 9, characterized in that, The number of at least one second antenna coil is two, one of which is disposed on the inner side of one end of the display panel, and the other of which is disposed on the inner side of the other end of the display panel.

13. The handheld electronic device as claimed in claim 1, characterized in that, Also includes: An electronic paper tag, configured to wirelessly communicate with one of the at least two second-generation antenna coils.

14. The handheld electronic device as claimed in claim 13, characterized in that, The electronic paper label includes: An electronic paper display having a display surface; An electronic paper circuit board is located on the opposite side of the electronic paper display from the display surface and is electrically connected to the electronic paper display; An induction coil, located on the surface of the electronic paper circuit board on the opposite side of the electronic paper display, is electrically coupled to one of the at least one second-stage induction coil; and A second short-range wireless transmission module is disposed on the electronic paper circuit board and electrically connected to the induction coil.

15. The handheld electronic device as claimed in claim 14, characterized in that, Also includes: A spacer is coupled to the electronic paper circuit board; as well as A magnetic substrate is coupled to the spacer and the electronic paper circuit board are respectively located on opposite sides of the spacer, wherein one of the at least one second antenna coil is formed on the surface of the magnetic substrate.

16. The handheld electronic device as claimed in claim 14, characterized in that, The second short-range wireless transmission module is a near-field communication chip.

17. The handheld electronic device as claimed in claim 14, characterized in that, Also includes: A bracket is positioned between the electronic paper display and the electronic paper circuit board to secure the electronic paper display.

18. A multi-antenna wireless transmission system, characterized in that, include: Multiple antenna coils, including: A first antenna coil; and At least one second antenna coil, configured with a different radiation direction from the first antenna coil; and An antenna drive circuit, coupled to the antenna coil, includes: Multiple antenna matching circuits are provided, each corresponding to a multiple antenna coil, and each antenna matching circuit is coupled to the corresponding antenna coil. A first short-range wireless transmission module; A receiver switching circuit is coupled between each of the antenna matching circuits and the first short-range wireless transmission module; and A transmitter switch circuit is coupled between each antenna matching circuit and the first short-range wireless transmission module.

19. The multi-antenna wireless transmission system as described in claim 18, characterized in that, Also includes: Multiple filter circuits, each corresponding to a multiple antenna matching circuit, wherein each filter circuit is coupled between the transmitter switching circuit and the corresponding antenna matching circuit and is configured to suppress or filter noise in the radio frequency signal.

20. The multi-antenna wireless transmission system as described in claim 18, characterized in that, Also includes: An electromagnetic interference shielding structure is located between the plurality of antenna coils and the antenna driving circuit to isolate the plurality of antenna coils from the antenna driving circuit.

21. The multi-antenna wireless transmission system as described in claim 18, characterized in that, Also includes: Multiple magnetically conductive substrates are respectively positioned to correspond to multiple antenna coils, with each antenna coil disposed on its corresponding magnetically conductive substrate.

22. The multi-antenna wireless transmission system as described in claim 18, characterized in that, The plane of the second antenna coil has an angle with the plane of the first antenna coil, and the angle is 90 ± 5 degrees.

23. The multi-antenna wireless transmission system as described in claim 18, characterized in that, The first short-range wireless transmission module is a near-field communication chip.

24. The multi-antenna wireless transmission system as described in claim 18, characterized in that, The sensing distance of each antenna coil is less than 100 mm.

25. The multi-antenna wireless transmission system as described in claim 18, characterized in that, The receiver switching circuit includes multiple first switching units, with multiple input terminals of each first switching unit respectively coupled to the multiple antenna matching circuits, and an output terminal of each first switching unit coupled to the first short-range wireless transmission module.

26. The multi-antenna wireless transmission system as described in claim 19, characterized in that, The transmitter switching circuit includes multiple second switching units, with multiple output terminals of each second switching unit respectively coupled to the multiple filter circuits, and an input terminal of each second switching unit coupled to the first short-range wireless transmission module.

27. The multi-antenna wireless transmission system as described in claim 18, characterized in that, The number of the second-day coil should be at least one.

28. The multi-antenna wireless transmission system as described in claim 18, characterized in that, The number of coils for at least one day and two days should be two.

29. The multi-antenna wireless transmission system as described in claim 18, characterized in that, Also includes: An electronic paper display having a display surface; An electronic paper circuit board is located on the opposite side of the electronic paper display from the display surface and is electrically connected to the electronic paper display; An induction coil, located on the surface of the electronic paper circuit board on the opposite side of the electronic paper display, is electrically coupled to one of the at least one second-stage induction coil; and A second short-range wireless transmission module is disposed on the electronic paper circuit board and electrically connected to the induction coil.

30. The multi-antenna wireless transmission system as described in claim 29, characterized in that, Also includes: A spacer is coupled to the electronic paper circuit board; as well as A magnetic substrate is coupled to the spacer and the electronic paper circuit board are respectively located on opposite sides of the spacer, wherein one of the at least one second antenna coil is formed on the surface of the magnetic substrate.

31. The multi-antenna wireless transmission system as described in claim 29, characterized in that, The second short-range wireless transmission module is a near-field communication chip.

32. The multi-antenna wireless transmission system as described in claim 29, characterized in that, Also includes: A bracket is positioned between the electronic paper display and the electronic paper circuit board to secure the electronic paper display.

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