Classifications

• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02J—ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
  • H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
  • H02J50/20—Circuit arrangements or systems for wireless supply or distribution of electric power using microwaves or radio frequency waves
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01Q—ANTENNAS, i.e. RADIO AERIALS
  • H01Q1/00—Details of, or arrangements associated with, antennas
  • H01Q1/12—Supports; Mounting means
  • H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
  • H01Q1/24—Supports; Mounting means by structural association with other equipment or articles with receiving set
  • H01Q1/248—Supports; Mounting means by structural association with other equipment or articles with receiving set provided with an AC/DC converting device, e.g. rectennas
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01Q—ANTENNAS, i.e. RADIO AERIALS
  • H01Q1/00—Details of, or arrangements associated with, antennas
  • H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
  • H01Q1/38—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith formed by a conductive layer on an insulating support
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01Q—ANTENNAS, i.e. RADIO AERIALS
  • H01Q21/00—Antenna arrays or systems
  • H01Q21/06—Arrays of individually energised antenna units similarly polarised and spaced apart
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01Q—ANTENNAS, i.e. RADIO AERIALS
  • H01Q21/00—Antenna arrays or systems
  • H01Q21/24—Combinations of antenna units polarised in different directions for transmitting or receiving circularly and elliptically polarised waves or waves linearly polarised in any direction
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01Q—ANTENNAS, i.e. RADIO AERIALS
  • H01Q23/00—Antennas with active circuits or circuit elements integrated within them or attached to them
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01Q—ANTENNAS, i.e. RADIO AERIALS
  • H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
  • H01Q5/40—Imbricated or interleaved structures; Combined or electromagnetically coupled arrangements, e.g. comprising two or more non-connected fed radiating elements
  • H01Q5/48—Combinations of two or more dipole type antennas
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01Q—ANTENNAS, i.e. RADIO AERIALS
  • H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
  • H01Q9/04—Resonant antennas
  • H01Q9/16—Resonant antennas with feed intermediate between the extremities of the antenna, e.g. centre-fed dipole
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01Q—ANTENNAS, i.e. RADIO AERIALS
  • H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
  • H01Q9/04—Resonant antennas
  • H01Q9/16—Resonant antennas with feed intermediate between the extremities of the antenna, e.g. centre-fed dipole
  • H01Q9/26—Resonant antennas with feed intermediate between the extremities of the antenna, e.g. centre-fed dipole with folded element or elements, the folded parts being spaced apart a small fraction of operating wavelength
• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02J—ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
  • H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
  • H02J50/005—Mechanical details of housing or structure aiming to accommodate the power transfer means, e.g. mechanical integration of coils, antennas or transducers into emitting or receiving devices
• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02J—ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
  • H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
  • H02J50/20—Circuit arrangements or systems for wireless supply or distribution of electric power using microwaves or radio frequency waves
  • H02J50/27—Circuit arrangements or systems for wireless supply or distribution of electric power using microwaves or radio frequency waves characterised by the type of receiving antennas, e.g. rectennas
• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02J—ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
  • H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
  • H02J50/40—Circuit arrangements or systems for wireless supply or distribution of electric power using two or more transmitting or receiving devices
• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02J—ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
  • H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
  • H02J50/40—Circuit arrangements or systems for wireless supply or distribution of electric power using two or more transmitting or receiving devices
  • H02J50/402—Circuit arrangements or systems for wireless supply or distribution of electric power using two or more transmitting or receiving devices the two or more transmitting or the two or more receiving devices being integrated in the same unit, e.g. power mats with several coils or antennas with several sub-antennas

Definitions

• the present invention relates to a multi-antenna and a power receiving device.
• WPT wireless power transfer
• a linear antenna such as a dipole antenna is used on the power receiving device side of a WPT to receive the transmitted energy.
• a single linear antenna it is difficult to ensure sufficient power receiving capacity and directivity, so multiple linear antennas or multi-antennas are used.
• Patent Document 1 shows an example in which two dipole antennas are crossed in a cross shape.
• Background art of this technical field includes International Publication No. 2018/096740 (Patent Document 2).
• Patent Document 2 shows an example in which two dipole antennas are crossed in a cross shape, each end side is arrow-shaped, and the shape is repeated in the vertical and horizontal directions.
• the present invention provides a multi-antenna that is inexpensive to manufacture and has excellent reception performance.
• a multi-antenna comprising: a substrate; a first antenna element arranged to surround one area of the substrate and consisting of two linear antennas extending in two different directions from a first feed point; a second antenna element consisting of two linear antennas extending in two different directions from a second feed point; and a connection line connecting the first feed point of the first antenna element and the first feed point of the second antenna element, the connection line being connected to the first feed point of the first antenna element along the bisector of an interior angle whose vertex is the first feed point of the first antenna element, and the connection line being connected to the second feed point of the second antenna element along the bisector of an interior angle whose vertex is the second feed point of the second antenna element.
• the present invention provides a multi-antenna that is inexpensive to manufacture and has excellent reception performance.
• FIG. 1 is a diagram showing the overall configuration of a WPT system.
• 1 is a block diagram illustrating an example of the configuration of a power transmitting device and a power receiving device.
• 2A and 2B are a top view and a side view of the main body of the power receiving device 1, 2.
• 2 is a top view of a substrate 10 built into the main body of the power receiving device 1.
• FIG. FIG. 2 is a perspective view of a single multi-antenna disposed on an FPC.
• FIG. 2 is a diagram showing a configuration according to a first embodiment of a multi-antenna (first embodiment);
• FIG. 13 is a diagram showing a configuration according to a second embodiment of the multi-antenna (first embodiment).
• FIG. 2 is a plan view showing multiple combinations of multi-antennas (first embodiment).
• FIG. 13 is a diagram showing a configuration according to a modified example of the multi-antenna (first embodiment).
• FIG. 13 is a diagram showing a configuration according to a first embodiment of a multi-antenna (second embodiment);
• FIG. 13 is a diagram showing a configuration according to a second embodiment of the multi-antenna (second embodiment);
• FIG. 13 is a diagram showing a configuration according to a third embodiment of the multi-antenna (second embodiment).
• FIG. 11 is a plan view showing multiple combinations of multi-antennas (second embodiment).
• FIG. 13 is a diagram showing a configuration according to a modified example of the multi-antenna (second embodiment).
• the diagram illustrates the connection relationship between the antenna elements, connecting wires, and a rectifier.
• 13A and 13B are diagrams showing a configuration of an interface board (Example 3) and a diagram showing an example of application of the interface board to a multi-antenna consisting of multiple linear antennas.
• FIG. 13 is an example of a table showing a comparison of substrates to which a multi-antenna can be applied.
• 1 is a diagram showing examples of the radiation efficiency of various multi-antennas, with (1) to (3) being shown.
• 1A and 1B are diagrams illustrating an example of application of a power receiving device in a building management field, and a usage pattern of the power receiving device.
• WPT wireless power transmission
• energy is transmitted between a power transmitting device and a power receiving device using microwaves.
• a linear antenna such as a dipole antenna is used in a power receiving device to receive energy transmitted from a power transmitting device.
• the power transmitting device In order to transmit and receive energy efficiently based on WPT, various issues must be considered. For example, the power transmitting device must consider physical constraints such as attenuation of radio waves during power transmission in free space. In addition, legal constraints such as the upper limit of transmitted power being regulated to 1 W must be considered. On the other hand, such legal restrictions have been relaxed on the power receiving device side, but the power receiving device side has its own problems as described below.
• Example 1 the applicant has devised a method for obtaining optimal performance for the multi-antenna used in the WPT power receiving device (Example 1), (Example 2).
• an interface board has been provided to assist in the placement and connection of each linear antenna (Example 3).
• an antenna with multiple elements arranged is called an array antenna.
• elements of the same shape and size are arranged in an array antenna.
• it is possible to design the desired characteristics such as the amount of power received and directivity.
• an array antenna radiates strong radio waves in a specific direction, and the strength of the received radio waves decreases almost inversely proportional to the distance.
• the length of the elements is adjusted so as to minimize the phase difference of the current and to pass a uniform and strong current.
• the element is configured as a linear antenna such as a dipole antenna made of copper wire or the like.
• a dipole antenna can be simplified to a single wire.
• a dipole antenna is a balanced circuit with the left and right sides of the antenna being the same length and the currents flowing through them being equal. Generally, when the length of a dipole antenna is approximately half the wavelength, a resonance phenomenon occurs and the strongest current flows.
• the formula for calculating d is not limited to the above formula.
• dipole antennas are designed as resonant antennas and as electric field detection types based on the wavelength of the operating frequency.
• the wavelength shortening rate may differ depending on the thickness and dielectric constant of the board's dielectric layer.
• the multi-antenna according to this embodiment basically follows the design concept of an array antenna, but special considerations are given to the arrangement and connection of the elements.
• the multi-antenna according to this embodiment it is possible to secure sufficient power reception and directivity to operate a sensor, etc.
• each linear antenna is efficiently connected, and problems such as electromagnetic coupling caused by the distance, direction, connection, etc. between each linear antenna are suppressed.
• connection line is arranged along the bisector of the interior angle formed by two adjacent linear antennas, so as to prevent any adverse effects on the antennas.
• FIG. 1 is a diagram showing the overall configuration of a WPT system according to this embodiment.
• the WPT system shown in FIG. 1 includes, for example, a power transmission device 4, power receiving devices 1 and 2, a first information processing device 61, and a second information processing device 62.
• the WPT system shown in FIG. 1 is used, for example, in a building or a factory. Note that the connection between the power transmission device 4 and the first information processing device 61, and the connection between the first information processing device 61 and the second information processing device 62 may be wired or wireless.
• the WPT system includes three power transmission devices 4, but the number of power transmission devices 4 included in the WPT system is not limited to three.
• the number of power transmission devices 4 included in the WPT system may be two or less, or may be four or more.
• the WPT system includes seven power receiving devices 1 and 2, but the number of power receiving devices 1 and 2 included in the WPT system is not limited to seven.
• the number of power receiving devices 1 and 2 included in the WPT system may be six or less, or eight or more.
• the WPT system includes two first information processing devices 61, but the number of first information processing devices 61 included in the WPT system is not limited to two.
• the number of first information processing devices 61 included in the WPT system may be one, or three or more.
• the power transmission device 4 transmits, for example, a power supply signal or a data signal to the power receiving devices 1 and 2.
• the power transmission device 4 transmits a power supply signal to the power receiving devices 1 and 2 by radio waves in the 920 MHz band, for example.
• the power transmission device 4 transmits a data signal to the power receiving devices 1 and 2 by radio waves in the 2.4 GHz band, for example.
• the power transmission device 4 may transmit a data signal by radio waves in the 920 MHz band.
• the power transmission device 4 may transmit a power supply signal to one power receiving device 1, 2, for example, or may transmit a power supply signal to multiple power receiving devices 1, 2.
• the power transmission device 4 may transmit a data signal to one power receiving device 1, 2, for example, or may transmit a data signal to multiple power receiving devices 1, 2.
• the power transmission device 4 may transmit the same data signal as other power transmission devices 4, for example, or may transmit a data signal different from other power transmission devices 4.
• the power transmission device 4 may transmit a predetermined command signal as a data signal to the power receiving devices 1, 2, for example, or may transmit a preset signal as a data signal to the power receiving devices 1, 2.
• the power transmission device 4 receives, for example, a data signal transmitted from the power receiving devices 1 and 2.
• the power transmission device 4 may receive, for example, a data signal transmitted from one power receiving device 1 and 2, or may receive data signals transmitted from multiple power receiving devices 1 and 2.
• the power transmission device 4 transmits the data signals transmitted from the power receiving devices 1 and 2 to the first information processing device 61.
• the power transmission device 4 transmits information related to the state of the power transmission device 4 to the first information processing device 61.
• the power receiving devices 1 and 2 receive, for example, a power supply signal or a data signal transmitted from the power transmitting device 4. For example, if the power receiving devices 1 and 2 have a power storage unit, they convert the power supply signal transmitted from the power transmitting device 4 into power and store the converted power in the power storage unit. For example, if the power receiving devices 1 and 2 have a specified sensor, they convert the power supply signal transmitted from the power transmitting device 4 into power and drive the sensor with the converted power.
• the power storage unit can be a battery, a capacitor, etc.
• the power receiving devices 1 and 2 transmit, for example, information about the state of the power receiving devices 1 and 2, or information about the measurement results by the sensor, to the power transmitting device 4 as a data signal.
• the first information processing device 61 is an information processing device that monitors the operation of the power transmission device 4 and the power receiving devices 1 and 2 housed in the WPT system. For example, the first information processing device 61 determines whether the power transmission device 4 or the power receiving devices 1 and 2 are in a preset state based on information about the state of the power transmission device 4 and the power receiving devices 1 and 2 transmitted from the power transmission device 4. If it is determined that the power transmission device 4 or the power receiving devices 1 and 2 are in a preset state, the first information processing device 61 transmits specified information to the second information processing device 62.
• the first information processing device 61 also accumulates information about the power transmission device 4 and power receiving devices 1 and 2 housed in the WPT system. For example, the first information processing device 61 stores information about the status of the power transmission device 4 and the power receiving devices 1 and 2, which is transmitted from the power transmission device 4, in a storage unit provided in the first information processing device 61.
• the first information processing device 61 also controls the operation of the power transmission device 4 housed in the WPT system.
• the first information processing device 61 also controls the operation of the power transmission device 4 housed in the WPT system. For example, the first information processing device 61 transmits a predetermined instruction or information to the power transmission device 4.
• the first information processing device 61 also controls the operation of the second information processing device 62.
• the second information processing device 62 is, for example, an information processing device operated by an administrator of the WPT system.
• the second information processing device 62 receives a notification from the first information processing device 61 that the power transmission device 4, the power receiving devices 1 and 2, or both of these accommodated in the WPT system are in a specified state, it presents to the user that the power transmission device 4, the power receiving devices 1 and 2, or both of these are in the specified state.
• the second information processing device 62 also analyzes information about the states of the power transmitting device 4 and the power receiving devices 1 and 2, which is stored in the first information processing device 61, and presents predetermined information to the user.
• the predetermined information is, for example, the following.
• Information regarding the arrangement of the power transmitting device 4 Information regarding the arrangement of the power receiving devices 1 and 2 Information regarding power consumption Information regarding power intensity
• FIG. 2 is a block diagram showing an example of the configuration of the power transmission device 4 and the power receiving devices 1 and 2 shown in FIG. 1.
• the power transmission device 4 and the power receiving devices 1 and 2 are, for example, spaced apart from each other at a predetermined interval.
• the power transmission device 4 and the power receiving devices 1 and 2 are installed at a distance of about several meters.
• the power transmission device 4 is fixed and installed at a predetermined high position provided on a high place indoors, for example, a ceiling or a wall.
• the power receiving devices 1 and 2 are installed on a predetermined device indoors, or placed near a device that requires power supply.
• the power receiving devices 1 and 2 may also be carried by a user.
• the power transmission device 4 transmits a power supply signal to the power receiving devices 1 and 2 by radio waves of a predetermined frequency, for example, 920 MHz band.
• the power receiving devices 1 and 2 convert the power supply signal transmitted from the power transmission device 4 into power, and charge the converted power or supply the converted power to a predetermined device.
• the power transmission device 4 has, for example, an oscillator 401, a transmission antenna 402, a microcomputer (controller or MCU) 403, a data transceiver 404, and a data transmission/reception antenna 405.
• the oscillator 401, the microcomputer 403, the data transceiver 404, the data transmission/reception antenna 405, or at least any combination of these, may be mounted on, for example, a PCB (printed circuit board).
• the oscillator 401 oscillates a signal in a specific frequency band, for example, the 920 MHz band.
• the oscillated signal may be amplified and unwanted frequency components removed, if necessary.
• the transmitting antenna 402 is configured to be capable of efficiently transmitting radio waves in the 920 MHz band, for example.
• the transmitting antenna 402 radiates the signal oscillated by the oscillator 401 as a power supply signal.
• the microcomputer 403 controls the operation of the power transmission device 4.
• the microcomputer 403 is realized, for example, by a single-board computer equipped with an ARM processor.
• the microcomputer 403 controls, for example, the transmission of radio waves by the transmission antenna 402.
• the data transceiver 404 performs processes such as converting digital data to analog and modulating analog data.
• the data transceiver 404 also performs processes such as demodulating the data signal received by the data transceiver antenna 405 and digitizing the demodulated data.
• the data transceiver 404 extracts a specific signal from the data signal received by the data transceiver antenna 405, converts it into digital data, and transmits it to the microcomputer 403.
• the data transmission/reception antenna 405 is configured to be able to efficiently transmit and receive radio waves in the 2.4 GHz band, for example.
• the data transmission/reception antenna 405 radiates the data signal supplied from the data transceiver 404.
• the data transmission/reception antenna 405 also receives the data signals transmitted from the power receiving devices 1 and 2.
• FIG. 3A is a top view of the main body of the power receiving device 1.
• FIG. 3B is a side view of the main body of the power receiving device 1.
• FIG. 4 is a top view of the substrate 10 built into the main body of the power receiving device 1.
• the power receiving device 1 has, for example, a multi-antenna 11, a rectifier 14, a power management unit 141, a power storage unit 142, a microcomputer 145, a data transceiver 144, and a data transmission/reception antenna 143.
• the multi-antenna 11, the connection line 111, the rectifier 14, the power management unit 141, the power storage unit 142, the microcomputer 145, the data transceiver 144, the data transmission/reception antenna 143, or a combination of at least any of these, may be mounted on, for example, a PCB or an FPC (flexible printed circuit board).
• the power management unit 141, the power storage unit 142, the microcomputer 145, the data transceiver 144, and the data transmission/reception antenna 143 arranged on the substrate 10 collectively form a circuit 12.
• the multi-antenna 11 is configured to be able to efficiently receive radio waves in the 920 MHz band, for example.
• the multi-antenna 11 receives the power supply signal radiated from the transmitting antenna 402.
• the rectifier 14 rectifies the radio waves received as a power supply signal and converts them into a DC voltage.
• the power management unit 141 manages the DC voltage. For example, the power management unit 141 controls the charging voltage based on the DC voltage. The power management unit 141 charges the power storage unit 142 by controlling the charging voltage. In addition, for example, when the power storage unit 142 stores power equal to or greater than a predetermined capacity, the power management unit 141 supplies the DC voltage to a connected member.
• the power management unit 141 also releases the power stored in the power storage unit 142 in response to control from the microcomputer 145.
• the power storage unit 142 stores power in response to instructions from the power management unit 141.
• the power storage unit 142 also releases the stored power in response to instructions from the power management unit 141.
• the microcomputer 145 controls the operation of the power receiving devices 1 and 2.
• the microcomputer 145 is driven by a DC voltage supplied from the power management unit 141 or by the power stored in the power storage unit 142.
• the microcomputer 145 controls the power management unit 141 to release the power stored in the power storage unit 142.
• various sensors can be connected to the power receiving devices 1 and 2.
• heat sensors, temperature sensors, light sensors, humidity sensors, vibration sensors, etc. are connected to the power receiving devices 1 and 2.
• the sensors connected to the power receiving devices 1 and 2 are driven, for example, by a DC voltage supplied from the power management unit 141 or by power discharged from the power storage unit 142.
• the microcomputer 145 continuously or intermittently monitors the voltage values at specific locations of the power receiving devices 1 and 2, the status of the sensors connected to the power receiving devices 1 and 2, information detected by the sensors, etc.
• the microcomputer 145 transmits the voltage values at specific locations of the power receiving devices 1 and 2, the status of the sensors connected to the power receiving devices 1 and 2, information detected by the sensors, etc. as digital data to the data transceiver 144.
• the sensors may be built into the power receiving devices 1 and 2.
• the data transceiver 144 performs processes such as converting digital data supplied from the microcomputer 145 to analog and modulating the analog data.
• the data transceiver 144 also performs processes such as demodulating the data signal received by the data transceiver antenna 143 and digitizing the demodulated data.
• the data transceiver 144 is driven, for example, by a DC voltage supplied from the power management unit 141 or by power discharged from the power storage unit 142.
• the data transmission/reception antenna 143 is formed to be capable of efficiently transmitting and receiving radio waves in the 2.4 GHz band, for example.
• the data transmission/reception antenna 143 radiates a data signal supplied from the data transceiver 144.
• the data transmission/reception antenna 143 also receives a data signal transmitted from the power transmission device 4.
• the data transmission/reception antenna 143 is driven by a DC voltage supplied from the power management unit 141, or by power discharged from the power storage unit 142.
• the power receiving device 1 is a power receiving device that receives energy wirelessly transmitted in a three-dimensional space based on wireless power transmission (WPT). Specifically, the power receiving device 1 is a wireless power transmission (WPT) power receiving device used to receive energy transmitted from a power transmitting device using microwaves.
• the power receiving device 1 includes a main body, a substrate 10 built into the main body, a multi-antenna 11 built into the main body, a circuit 12 for exerting the function of the multi-antenna 11 built into the main body, and a device 13.
• the power receiving device 1 is capable of receiving microwaves transmitted from a power transmitting device via the multi-antenna 11 and supplying power to the circuit 12, the device 13, etc.
• the circuit 12 is functionally coupled to a rectifier 14.
• the circuit 12 is connected to the multi-antenna 11 via the rectifier 14.
• the multi-antenna 11 includes a connection line 111 , a first antenna element 112 and a second antenna element 113 .
• the power receiving device 1 is connected to a controller (MCU) by wire and can transmit data related to power reception to the MCU.
• the power receiving device may provide feedback on the amount of power received to the MCU.
• the circuit 12 may have the functionality of an MCU. Alternatively, the circuit 12 may be configured to be capable of data communication with an MCU (not shown).
• the main body of the power receiving device 1 is configured in a multi-layered structure.
• a printed wiring board (substrate) can be provided on an FPC (flexible printed circuit board), which is a type of substrate 10.
• the FPC is provided with a multi-antenna 11 capable of receiving energy wirelessly transmitted within a three-dimensional space.
• the FPC can be flexible.
• the FPC can be formed using a thin insulating material (plastic film). This allows the sheet-shaped power receiving device 1 to be rolled up together with the built-in FPC.
• FIG. 5 is a perspective view of a single multi-antenna disposed on an FPC.
• FIG. 6 is a diagram showing a configuration according to a first embodiment of the multi-antenna (first embodiment).
• the FPC may be provided with only one multi-antenna 11 .
• the FPC may be provided with a plurality of multi-antennas 11 .
• the multi-antenna is composed of linear antennas, such as linear dipole antennas, arranged on the FPC (substrate 10).
• the first antenna element 112 includes a first feed point 1121 and two linear antennas 1122 extending in two different directions from the first feed point 1121.
• the second antenna element 113 includes a second feed point 1131 and two linear antennas 1132 extending in two different directions from the second feed point 1131.
• the number of antenna elements provided in the multi-antenna 11 does not have to be two, and may include more than two antenna elements; in other words, the multi-antenna 11 according to the present disclosure is a multi-antenna that includes at least two or more antenna elements.
• the two linear antennas 1122 of the first antenna element 112 are preferably orthogonal to each other at an angle of 90 degrees at the first feeding point 1121.
• the two linear antennas 1132 of the second antenna element 113 are preferably orthogonal to each other at an angle of 90 degrees at the second feeding point 1131.
• the two linear antennas 1122, 1132 provided in the first antenna element 112 and the second antenna element 113 are bent into an L-shape with the first feeding point 1121 and the second feeding point 1131 as apexes, and are formed by extending in two directions at an angle of 90 degrees perpendicular to each other from the first feeding point 1121 and the second feeding point 1131.
• the linear antennas 1122, 1132 extend by substantially equal lengths from the first feeding point 1121 and the second feeding point 1131, respectively. This makes it possible to improve the power receiving efficiency by suppressing electromagnetic coupling caused by mutual interference between the linear antennas 1122 and 1132. Furthermore, by reducing the number of linear antennas, the manufacturing cost can be reduced.
• linear antennas 1122 and 1132 are configured symmetrically, they may be configured partially asymmetrically when implemented.
• the linear antennas 1122 and 1132 do not necessarily have to be straight lines. For example, they may be curved lines, as shown in Figures 4 and 9C.
• the first antenna element 112 and the second antenna element 113 are arranged to surround one area 101 of the substrate 10 .
• the first antenna element 112 and the second antenna element 113 extend along the four sides of the region 101 which is a substantially regular polygon.
• Two linear antennas 1122, 1132 formed in an L-shaped bent shape with first feeding point 1121 and second feeding point 1131 as vertices are arranged point-symmetrically with respect to the center of one area 101 of substrate 10 so as to surround area 101.
• first antenna element 112 and second antenna element 113 are arranged opposite each other so as to surround approximately square area 101.
• the length of one side of the substrate 10 is about 8 cm, and the lengths of the linear antennas 1122, 1132 of the first antenna element 112 and the second antenna element 113 are configured to be about 7 cm.
• the circuit 12 is formed in a square shape, and the length of one side is about 3.5 cm.
• FIG. 7 is a diagram showing a configuration according to a second embodiment of the multi-antenna (first embodiment).
• the area 101 surrounded by the first antenna element 112 and the second antenna element 113 does not have to be square, but may be rectangular.
• a multi-antenna with a small substrate area, low manufacturing costs, and excellent reception performance can be realized compared to the case where the elements are arranged so as to surround the rectangular area 101.
• the distance from one end of the first antenna element to one end of the second antenna element adjacent to the one end of the first antenna element is preferably ⁇ /64 or more, where ⁇ is the operating wavelength of the power receiving device.
• the distance from one end of the first antenna element to one end of the second antenna element adjacent to the one end of the first antenna element is preferably ⁇ /32 or more. 5
• one end of the linear antenna 1132 of the first antenna element is spaced apart from one end of the linear antenna 1122 of the second antenna element by a distance L.
• the other end of the linear antenna 1132 of the first antenna element is spaced apart from the other end of the linear antenna 1122 of the second antenna element by a distance L.
• L is equal to or greater than ⁇ /64, and more preferably equal to or greater than ⁇ /32, where ⁇ is the operating wavelength of the power receiving device.
• L may be a distance smaller than ⁇ or an arbitrary integer multiple of ⁇ . It may also be equal to or greater than ⁇ /16.
• FIG. 9A is a diagram showing a configuration according to a first modified example of the multi-antenna (first embodiment).
• FIG. 9B is a diagram showing a configuration according to a second modified example of the multi-antenna (first embodiment).
• FIG. 9C is a diagram showing a configuration according to a third modified example of the multi-antenna (first embodiment).
• FIG. 9D is a diagram showing a configuration according to a fourth modified example of the multi-antenna (first embodiment).
• FIG. 9E is a diagram showing a configuration according to a fifth modified example of the multi-antenna (first embodiment).
• the number of antenna elements 112, 113 included in the multi-antenna 11 according to the present disclosure is not limited to two.
• the linear antennas 1122, 1132 included in the antenna elements 112, 113 may be arranged line-symmetrically, not point-symmetrically, so as to surround the area 101.
• the area surrounded by the linear antennas does not need to be polygonal, and may be circular or elliptical.
• the linear antennas 1122, 1132 of the first antenna element 112 and the second antenna element 113 may extend in a curved manner along the four sides of the approximately square area 101 in which the circuit 12 is arranged.
• the linear antennas 1122, 1132, and 1142 may be arranged to surround the substantially equilateral triangular region 101 in which the circuit 12 is arranged.
• the linear antennas 1122, 1132, and 1142 form an equilateral triangle that is symmetrical with respect to an axis.
• the linear antennas 1122 to 1162 may be arranged to surround a substantially regular pentagonal region 101 in which the circuit 12 is arranged.
• the linear antennas 1122 to 1162 form a regular pentagon that is symmetrical with respect to an axis.
• the linear antennas 1122 to 1172 may be arranged to surround the substantially regular hexagonal region 101 in which the circuit 12 is arranged.
• the linear antennas 1122 to 1172 form a regular hexagon that is symmetrical with respect to a line and a point. 9E, the linear antennas 1122, 1132, and 1142 may be arranged to surround the substantially circular area 101 in which the circuit 12 is arranged. The linear antennas 1122, 1132, and 1142 form a circle.
• connection line 111 is a DC connection line that connects the dipole antennas.
• each antenna element has equal length on the left and right to form a balanced circuit.
• a rectifier is provided in the center.
• Each antenna is connected to the rectifier, and they are connected by the connection line 111.
• the polarity of the rectifier is connected to the same polarity. It should be understood that any type of rectifier may be applied in this embodiment.
• the connection lines 111 connecting the antenna elements are arranged so as not to create a complex configuration.
• connection line 111 One end of the connection line 111 is connected to the first feed point 1121 of the first antenna element 112, and the other end of the connection line 111 is connected to the second feed point 1131 of the second antenna element 113. Note that when the number of antenna elements constituting the multi-antenna 11 is greater than two, the connection line 111 connects the feed points of each antenna element.
• connection line 111 is connected to the first feed point 1121 and the second feed point 1131 of the first antenna element 112 and the second antenna element 113 along the bisector of the interior angle formed by the first feed point 1121 and the second feed point 1131 of the first antenna element 112 and the second antenna element 113 as vertices. Specifically, the connection line 111 is connected to a first feed point 1121 of the first antenna element 112 along the bisector of the interior angle formed by the two linear antennas of the first antenna element 112. The connection line 111 is connected to a second feed point 1131 of the second antenna element 113 along the bisector of the interior angle formed by the two linear antennas of the second antenna element 113.
• connection line 111 is connected to a first feeding point 1121 and a second feeding point 1131 of the first antenna element 112 and the second antenna element 113 via the connection line 111 and rectifiers 1123 and 1133, respectively.
• FIG. 15 illustrates the connection relationship between antenna elements 112 and 113, connection line 111, and rectifiers 1123 and 1133. This allows a large potential difference between the multi-antenna and GND, improving the performance of the multi-antenna.
• a circuit 12 for implementing the function of the multi-antenna built into the FPC is built into the main body of the power receiving device 1.
• the FPC and the circuit can be connected by wire. Any device can be added to the circuit 12 to improve the flow of balanced currents through the multiple antennas, such as a filter or a mixer.
• the circuit 12 is provided at a position that does not overlap any antenna element included in the multi-antenna 11 when viewed from a direction perpendicular to the surface of the substrate 10 .
• the circuit 12 may be provided in a central region of one area 101 of the substrate 10 surrounded by the first antenna element 112 and the second antenna element 113 . It is preferable that the distance from the first feeding point 1121 of the first antenna element 112 to the circuit 12 be approximately equal to the distance from the second feeding point 1131 of the second antenna element 113 to the circuit 12 . In this way, by utilizing the area of the circuit 12 as a means for suppressing electromagnetic coupling, it is possible to realize a power receiving device that requires a small board area, is inexpensive to manufacture, and has excellent power receiving efficiency.
• the multi-antenna 11 includes antenna elements other than the first antenna element 112 and the second antenna element 113. Even in such cases, it is preferable that the circuit 12 is provided at a position that does not overlap any antenna element including the other antenna elements. This is because if the antenna element and the circuit 12 overlap, the power receiving efficiency decreases due to electromagnetic coupling between the antenna element and the circuit 12 .
• the first antenna element 112 and the second antenna element 113 are spaced apart from the circuit 12 by a distance of ⁇ /8 or more. In particular, it is preferable that the first antenna element 112 and the second antenna element 113 are spaced apart from the circuit 12 by a distance of ⁇ /4 or more.
• ⁇ is the wavelength (operating wavelength) of the electromagnetic wave (microwave) for receiving energy.
• the circuit 12 may be formed in a shape that is away from the direction opposite to the direction of the first antenna element 112 and the second antenna element 113 .
• the directivity of the first antenna element 112 is directed from the inside of the area 101 to the outside direction passing through the first feeding point 1121.
• the directivity of the second antenna element 113 is directed from the area 101 to the outside direction passing through the second feeding point 1131.
• the circuit 12 is formed in a quadrangular shape when viewed from a direction perpendicular to the surface of the substrate 10.
• the first vertex 121 and the second vertex 122 of the quadrangular circuit 12 may be recessed in a direction away from the first feeding point 1121 of the first antenna element 112 and the second feeding point 1131 of the second antenna element 113, respectively, or may be formed in a notched shape.
• the circuit 12 may be arranged in the area 101 by rotating it by 45 degrees.
• the configuration of the power receiving device 2 according to the second embodiment will be described below. Note that the basic configuration is common to the power receiving device 1 according to the first embodiment, and therefore a description of the common configuration will be omitted.
• the power receiving device 2 is a power receiving device that receives energy wirelessly transmitted in a three-dimensional space based on wireless power transmission (WPT). Specifically, the power receiving device 2 is a wireless power transmission (WPT) power receiving device used to receive energy transmitted from a power transmitting device using microwaves.
• WPT wireless power transmission
• the power receiving device 2 includes a main body, a substrate 20 built into the main body, a multi-antenna 21 built into the main body, a circuit 22 for exerting the function of the multi-antenna 21 built into the main body, and a device 23.
• the power receiving device 2 receives microwaves transmitted from the power transmitting device via the multi-antenna 21 and is capable of supplying power to the circuit 22, the device 23, etc.
• the multi-antenna 21 includes a connection line 211 and linear antennas 212 to 217 .
• FIG. 10 is a diagram showing a configuration according to a first embodiment of the multi-antenna (second embodiment).
• the multi-antenna 21 includes two linear antennas 212, 213 arranged in an approximately cross shape so as to define the substrate 20 into four regions 201, 202, 203, 204, and four linear antennas 214-217 arranged on the four sides of an approximately quadrangle at the outermost side on the substrate so as to surround the four regions 201, 202, 203, 204.
• This allows the linear antenna to have a longer antenna length with the same board area, thereby achieving a power receiving device with excellent power receiving efficiency.
• the linear antennas 212 to 217 do not necessarily have to be straight lines, and may be curved lines, for example.
• two linear antennas 212, 213 having equal lengths are orthogonal to each other at an angle of 90 degrees at the center.
• Four linear antennas 214 to 217 are arranged to surround the two orthogonally arranged linear antennas 212, 213 from the outside, and are each arranged at an angle of 45 degrees to the two linear antennas 212, 213. This makes it possible to realize a power receiving device having superior power receiving efficiency compared to the power receiving device (embodiment 1).
• FIG. 11 is a diagram showing a configuration according to a second embodiment of the multi-antenna (second embodiment). At least one end of at least some of the four linear antennas 214 to 217 is bent toward the inside or outside of the four regions. Specifically, both ends of the four linear antennas 214 to 217 have bent portions 2141, 2142, 2151, 2152, 2161, 2162, 2171, and 2172 that are bent toward the inside of the four regions. In this disclosure, as an example, a configuration in which both ends of all of the four linear antennas 214 to 217 are bent toward the inside of the four regions is disclosed, but it is also possible to have one end or both ends of some or all of the four linear antennas 214 to 217 bent toward the inside of the four regions.
• the four linear antennas 214 to 217 provided outside the linear antennas 212 and 213 are bent inward at 45 degree angles at both ends, thereby forming bent portions 2141 , 2142 , 2151 , 2152 , 2161 , 2162 , 2171 , and 2172 .
• the folded portions 2141, 2142, 2151, 2152, 2161, 2162, 2171, and 2172 may be folded toward the outside of the four regions.
• FIG. 12 is a diagram showing a configuration according to a third embodiment of the multi-antenna (second embodiment). At least one end of at least a part of the four linear antennas 214 to 217 is folded back twice toward the inside or outside of the four regions. Specifically, both ends of the four linear antennas 214 to 217 have folded-back portions 2143, 2144, 2153, 2154, 2163, 2164, 2173, and 2174 that are folded back twice toward the inside of the four regions.
• the four linear antennas 214 to 217 provided outside the linear antennas 212 and 213 are folded back twice inward at angles of 45 degrees and 90 degrees at both ends, thereby forming folded back portions 2143, 2144, 2153, 2154, 2163, 2164, 2173, and 2174.
• This allows the linear antenna to have a longer antenna length with the same board area, thereby achieving a power receiving device with excellent power receiving efficiency.
• the folded portions 2143, 2144, 2153, 2154, 2163, 2164, 2173, and 2174 may be folded back twice toward the outside of the four regions.
• FIG. 14 is a diagram showing a configuration according to a modified example of the multi-antenna (second embodiment).
• the number of linear antennas 212 to 217 included in the multi-antenna 21 according to the present disclosure is not limited to six.
• the four linear antennas 214 to 217 arranged on the four sides of the approximate rectangle do not necessarily have to be straight lines. For example, they may be curved lines.
• the two linear antennas 212 and 213 arranged in a substantially cross shape do not necessarily have to be straight lines. For example, they may be curved lines.
• connection line 211 connects all six of the linear antennas 212 to 217 in a single stroke clockwise or counterclockwise. When the number of linear antennas constituting the multi-antenna 21 is greater than six, the connection line 211 connects each linear antenna.
• the connecting line 211 connects at an angle of 90 degrees from the orthogonal portion of the two linear antennas 212, 213 to approximately the center of the linear antenna 215.
• the linear antennas 212, 213 and the connecting line 211 form an angle of 45 degrees.
• connection line 211 connects all six of the linear antennas 212 to 217 in a single clockwise motion.
• the connecting line 211 connects at an angle of 90 degrees from the orthogonal portion of the two linear antennas 212, 213 to approximately the center of the linear antenna 216.
• the linear antennas 212, 213 and the connecting line 211 form an angle of 45 degrees.
• the connection line 211 is connected to approximately the center of the linear antenna 216 at an angle of 45 degrees, and is connected to approximately the center of the linear antenna 217 at an angle of 45 degrees.
• the connection line 211 is connected to approximately the center of the linear antenna 217 at an angle of 45 degrees, and is connected to approximately the center of the linear antenna 214 at an angle of 45 degrees.
• the connection line 211 is connected to approximately the center of the linear antenna 214 at an angle of 45 degrees, and is connected to approximately the center of the linear antenna 215 at an angle of 45 degrees.
• the circuit 22 is provided at a position that does not overlap any of the linear antennas included in the multi-antenna 21 when viewed from a direction perpendicular to the surface of the substrate 20 .
• the circuit 22 may be provided inside any one of the four regions 201, 202, 203, and 204 defined by the linear antennas 212 to 217, but at a position not overlapping with the linear antennas. In this way, by utilizing the area of the circuit 22 as a means for suppressing electromagnetic coupling, it is possible to realize a power receiving device that requires a small board area, is inexpensive to manufacture, and has excellent power receiving efficiency.
• multiple multi-antennas 11, 21 may be arranged in the vertical direction (y-axis direction) and/or horizontal direction (x-axis direction). In this case, adjacent multi-antennas 11, 21 may be arranged with an offset (shift) from each other. The offset interval is arbitrary.
• the multi-antenna 11 according to Example 1 and the multi-antenna 21 according to Example 2 may be combined and arranged in any desired manner.
• Adjacent multi-antennas 11 and 21 may be offset from each other. Any of the multiple antennas 11, 21 may be rotated clockwise or counterclockwise. When multiple multi-antennas 21 are arranged side by side, they may be arranged so as to share at least a part of the outermost linear antennas 214 to 217 .
• FIG. 16A and 16B are diagrams showing the configuration of an interface board (Example 3).
• FIG. 16C is a diagram showing an example of application of an interface board to a multi-antenna consisting of multiple linear antennas.
• an interface board (small board) 51 that assists in the arrangement and connection of the linear antennas 1122, 1132, 212 to 217, the connection lines 111, 211, etc. included in the multi-antennas 11, 21 is illustrated.
• the main body 52 of the interface board 51 is constructed based on a polygon model. In this embodiment, it is formed based on a regular octagon. In a regular octagon, all sides are equal in length, and each interior angle is constant at 135 degrees, with the central angle being 45 degrees.
• a main body 52 of the interface board 51 is configured in a generally regular polygonal shape, and connectors enabling two-terminal connection can be arranged at each corner 54 of the main body.
• This interface substrate 51 facilitates application to each connection portion of the multi-antennas 11, 21 which may be configured geometrically symmetrically or fractally. As illustrated in Figures 16A and 16B, the interface board 51 can utilize connectors located at multiple corners to allow for various configurations of current flow within the body 52.
• the interface board 51 illustrated in FIGS. 16A and 16B can be used in combination with a linear antenna (dipole antenna) related to the multi-antennas 11 and 21, a rectifier integrated with the linear antenna, and an FPC cable.
• FIG. 16C there is shown an example of application of the interface board 51 to a multi-antenna consisting of a plurality of linear antennas.
• Each linear antenna has a rectifier at its center, which allows connection to a connector on the interface board.
• the interface board allows connection to an FPC cable, a controller, etc. at other connectors.
• the interface board has an internal switch mechanism, which allows the connection to the linear antenna, FPC cable, and controller to be freely switched and selected.
• the interface board 51 illustrated in FIGS. 16A and 16B can also be configured with a switch so that connections can be freely changed inside the main body 52. As shown in FIGS. 16A and 16B, all interface boards 51 can have two inputs when connected to each antenna, and one input and one output when only setting two output angles.
• the multi-antenna can be reconfigured by controlling the switches inside the interface board from the controller.
• any pattern can be connected using only three types of board patterns (component mounting can be switched each time).
• all of the boards can be flexible and mounted on one side. This is advantageous in terms of design and manufacturing.
• the interface board 51 By using the interface board 51, it becomes easy to adapt to design changes of the multi-antenna. Furthermore, by using the interface board 51, it is possible to increase the resistance of the multi-antenna even when it is subjected to a strong load such as stress or heat. Furthermore, the interface board 51 can be joined with solder, connectors, tape, etc., and housed in a housing, making it easy for the board to blend in with the environment.
• the multi-antenna and flexible substrate according to this embodiment have been described above with reference to FIGS.
• the power receiving device 1 including the multi-antenna and the flexible substrate exemplified in FIGS. 5 to 13 will be described with reference to FIGS. 19A and 19B.
• FIG. 18A is an example showing the radiation efficiency of various multi-antennas as (1) to (3).
• FIG. 18B is an example illustrating multiple antennas. Referring to FIG. 18A, various multi-antenna configurations and their radiation efficiencies are illustrated as (1) to (3). In each of (1) to (3), a multi-antenna is formed by combining six linear antennas within a square frame with each side measuring 12 cm.
• (1) in the figure shows an example of a multi-antenna in which multiple linear antennas, such as dipole antennas, are arranged radially so that they intersect at their respective center points.
• a total of six antennas are arranged so that two adjacent antennas form an angle of 30 degrees.
• each antenna can be connected at the center point, making connection easy.
• a multi-antenna is illustrated in which multiple linear antennas such as dipole antennas are arranged in parallel.
• a total of six antennas are arranged so that two adjacent antennas are spaced apart by a predetermined distance.
• Each antenna can be connected in a meandering shape bent in a zigzag pattern.
• six linear antennas such as dipole antennas are arranged in a more complicated manner compared to the above cases (1) and (2). This example was devised by the applicant of the present invention.
• two linear antennas are arranged in a roughly cross shape at approximately the center of the board, and linear antennas are arranged along the four sides of a rectangle surrounding the cross. Both ends of the outer linear antennas are folded back twice inward, at angles of 45 degrees and 90 degrees. Each antenna can be connected relatively easily along the black connecting wires.
• the radiation efficiency of the various multi-antennas (1), (2), and (3) above is compared.
• the radiation efficiency of the multi-antenna of (3) above is the highest, and for example, at a frequency of 0.92 GHz, when the ideal performance of the antenna is taken as 100%, it exceeds approximately 90%.
• the radiation efficiency of the multi-antennas of (1) and (2) above is approximately 85% at a frequency of 0.92 GHz, when the ideal performance of the antenna is taken as 100%.
• a multi-antenna in which multiple linear antennas are arranged close to each other to improve spatial efficiency, and a circuit is arranged between the multiple linear antennas to avoid or suppress the problem of electromagnetic coupling.
• multi-antenna refers to multiple linear antennas (such as dipole antennas) placed close to each other to increase spatial efficiency. It is advisable to connect the antennas by a connecting line (such as a DC connecting line) so as to avoid or reduce electromagnetic coupling problems.
• power receiving device refers to a device that receives energy wirelessly transmitted from a separate power transmitting device within a three-dimensional space using multiple built-in antennas.
• WPT wireless power transmission
• a PC PC
• a sensor a sensor
• an actuator a robot
• the embodiment can be configured in various ways.
• FIG. 19A is a diagram illustrating an example in which a power receiving device is applied in a building management area.
• FIG. 19B is a schematic diagram showing a usage pattern of the power receiving device.
• a power transmitting device is provided outside the power receiving devices 1 and 2, and the power transmitting device transmits energy E to the outside.
• the multi-antennas 11 and 21 built into the power receiving devices 1 and 2 are configured to be able to receive the energy E wirelessly transmitted from the outside.
• the power receiving devices 1 and 2 can be connected to a MCU (controller) by wire and can transmit data related to power reception to the MCU. For example, the power receiving device can feed back the amount of power received to the MCU.
• MCU controller
• FIG. 19B a schematic diagram of the usage forms of the power receiving devices 1 and 2 is shown.
• the power receiving devices 1 and 2 including the multi-antennas 11 and 21 configured in a planar, curved, or three-dimensional manner can be used in various forms, such as desk mats and objects d'art.
• examples of other forms of the power receiving device 1 are illustrated generally using the reference numerals 1 and 2.
• the power receiving devices 1 and 2 may be configured as a desk mat, a mouse pad, a table mat, a vinyl mat, a protective mat, etc.
• the power receiving devices 1 and 2 are installed, for example, on an office desk, a dining table, or the top surface of a shelf.
• the power receiving devices 1 and 2 receive transmission power from a power transmitting device outside the desk, and can use this power to supply power to electronic devices such as a personal computer, a mouse, a smartphone, and a camera placed on the power receiving devices 1 and 2.
• Power can be supplied from the power receiving devices 1 and 2 to these electronic devices wirelessly or by wire. By adopting such a configuration, the wiring on the power receiving devices 1 and 2 can be eliminated or reduced.
• the main body of the power receiving device 1, 2 is preferably configured in a multi-layered manner and includes a front surface and a back surface. Either one of the two opposite surfaces (e.g., the back surface) can be abutted against the surface of a desk, and the other surface (e.g., the front surface) can be used as a work surface on the desk.
• the power receiving devices 1 and 2 can be configured so that either the front or back surface can be used as a work surface (reversible type).
• the front and back surfaces may each have the same color or the same material, or the front and back surfaces may each have different colors or materials, for example, the front and back surfaces may each be configured using resin, etc.
• an FPC flexible printed circuit board
• a printed wiring board substrate
• the FPC is provided with a multi-antenna capable of receiving energy wirelessly transmitted within a three-dimensional space. In this way, the multi-antenna cannot be seen from the outside, making it possible to place the multi-antenna without spoiling the aesthetic look of the surrounding environment.
• the power receiving devices 1 and 2 may be suspended from the ceiling in a three-dimensional space.
• the power receiving devices 1 and 2 may be arranged in the form of lighting suspended from the ceiling by a cord or chain.
• a multi-antenna may be arranged using the flat or curved surface of a lighting shade or umbrella.
• the power receiving devices 1 and 2 may be in any form suspended from the ceiling, in addition to lighting.
• the power receiving devices 1 and 2 may be mounted on a wall of a room in a three-dimensional space.
• the power receiving devices 1 and 2 may be arranged like a wall clock attached to a wall or a pillar with a nail or the like.
• a multi-antenna may be arranged using the face of the wall clock.
• the power receiving devices 1 and 2 may be in any form that can be attached to a wall or a pillar, other than a clock.
• the power receiving devices 1 and 2 may be in a form that stands on a leg or stands on its own on the floor in a three-dimensional space.
• the power receiving devices 1 and 2 may be arranged like a frame or board for a picture, poster, etc. on a stand set up on the floor, such as a tripod.
• a multi-antenna may be arranged using the inside of a frame or the like.
• the power receiving devices 1 and 2 may be in any form that stands on its own on the floor, in addition to a picture or board.
• the power receiving devices 1 and 2 may be placed on a floor in a three-dimensional space.
• the power receiving devices 1 and 2 may be arranged as a shelf or a desk.
• a multi-antenna may be arranged using at least one side of the shelf or desk.
• the power receiving devices 1 and 2 may be in any form placed on the floor, in addition to a shelf or desk.
• the power receiving devices 1 and 2 may be configured so that a multi-antenna is arranged on the side of a sheet or object placed on a desk.
• the power receiving devices 1 and 2 may be in a form movable in a three-dimensional space.
• the power receiving devices 1 and 2 may be arranged on one side of a business bag or a handbag.
• a multi-antenna may be arranged on the substantially rectangular rear surface of the business bag or the handbag.
• the power receiving devices 1 and 2 may be in any movable form other than a bag.
• the power receiving devices 1 and 2 may be configured so that a multi-antenna is arranged on the side of a mobile phone.
• the power receiving devices 1 and 2 may be placed at the four corners of a desk, or on the side, ceiling, or floor of a room in which the desk is placed.
• the power receiving devices 1 and 2 can transmit energy wirelessly to a PC (personal computer), a sensor, an actuator, a robot, a device, and the like, by utilizing WPT (wireless power transmission).
• the targets of this power transmission may also be mobile phones, PDAs (personal digital assistants), wireless microphones, wireless USBs, wireless theaters, wireless televisions, wireless cameras, wireless headphones, wireless mice, wireless keyboards, wireless routers, wireless printers, etc.
• the power receiving devices 1 and 2 can be connected to these targets by wires. Any type of power storage device or the like may be interposed between them.
• the power receiving devices 1 and 2 may be integrated with these targets.
• the power receiving devices 1 and 2 have a main body configured in a flexible sheet shape or in any other shape, and the multi-antennas 11 and 21 can be arranged on an FPC built into the main body.
• Flexible substrates can be bent or folded freely, and can also form circuit patterns.
• Flexible substrates are also called FPCs (Flexible Printed Circuits).
• FFCs Flexible Flat Cables
• the multi-antennas 11 and 21 are disposed on the substrates 10 and 20, for example, on the flexible substrates 10 and 20.
• the flexible substrates 10 and 20 may include an FPC and an FFC.
• the flexible boards 10 and 20 are compared with FPC and FFC from the viewpoints of appearance, form, component mounting/pattern, shape change, cost, and lead time.
• FPC and FFC each have advantages and disadvantages.
• FPC and FFC can be used depending on the implementation environment. It should be understood that in this embodiment, the shape, dimensions, material, etc. of the substrate on which the multi-antennas 11 and 21 are arranged can be selected arbitrarily.
• the FPC or FFC can be attached by any means inside the main body or housing of the power receiving devices 1 and 2.
• the attachment can be performed by soldering, connector mounting, copper foil tape adhesion, or the like.
• solder bonding has the advantage of being highly suitable for mass production, it has the problem that the heat generated during bonding can cause deterioration of the board.
• the connector mounting has the advantage of easy reconfiguration, it has the problem that the thickness tends to increase due to the use of the connector.
• Copper foil tape bonding has the advantage of being thin and not subject to heat, but there are issues with mass production. In this embodiment, these can be used depending on the implementation environment.
• the multi-antenna according to the present embodiment has been described above with reference to the drawings, it should be understood that the present embodiment is not limited to the configuration shown in the drawings.
• the multi-antenna according to this embodiment can be combined with a cover called a radome that protects the antenna.
• the radome can have a metal plate placed inside it behind the antenna to generate reflected waves and increase the directivity of the antenna.
• the multi-antenna according to this embodiment may generate a reflection condition using a metal plate installed on the wall or ceiling of a room.
• a dipole antenna has been described as a suitable example of a linear antenna, but it should be understood that the present embodiment is not limited to this form.
• a part or a plurality of the multi-antennas according to this embodiment may be replaced with other linear conductors such as a bow-tie dipole, a monopole antenna, an inverted F-shaped antenna, or the like, or may be used in combination.
• the multi-antenna according to this embodiment does not necessarily have to be entirely made up of straight linear antennas.
• Some or more of the multi-antenna according to this embodiment may be replaced with a meandering shape bent in a zigzag pattern, or a star-shaped arrangement extending radially from a roughly inclined plane, or may be used in combination.
• Metamaterials are artificial media that are made by periodically arranging regular structures of metals, dielectrics, or magnetic materials to artificially create characteristic physical phenomena related to the wavelength of electromagnetic waves.
• any device can be added to the multi-antenna of this embodiment to improve the flow of balanced current.
• any device that can be used in conventional antenna technology such as a blocking tube (glotop) or a balun (BALUN), can be added.
• the above description is particularly concerned with receiving energy transmitted wirelessly, but the communication method is arbitrary. It should be understood that any communication method, such as wireless LAN, Bluetooth (registered trademark), etc., can be used.
• the present invention is not limited to the above-described embodiments, but includes various modified examples.
• the above-described embodiments have been described in detail to clearly explain the present invention, and are not necessarily limited to those having all of the configurations described. It is also possible to replace part of the configuration of one embodiment with the configuration of another embodiment, and it is also possible to add the configuration of another embodiment to the configuration of one embodiment. It is also possible to add, delete, or replace part of the configuration of each embodiment with other configurations.
• control lines and information lines shown are those that are considered necessary for the explanation, and not all control lines and information lines in the product are necessarily shown. In reality, it can be considered that almost all components are connected to each other.
• the above-described embodiments disclose at least the configurations described in the claims.
• a multi-antenna comprising: a substrate; a first antenna element arranged to surround one region of the substrate and consisting of two linear antennas extending in two different directions from a first feed point; a second antenna element consisting of two linear antennas extending in two different directions from a second feed point; and a connecting line connecting the feed point of the first antenna element and the feed point of the second antenna element, wherein the connecting line is connected to the first feed point of the first antenna element along the bisector of an interior angle whose vertex is the first feed point of the first antenna element, and the connecting line is connected to the second feed point of the second antenna element along the bisector of an interior angle whose vertex is the second feed point of the second antenna element.
• Appendix 6 A power receiving device described in any one of appendix 1 to 5, wherein ⁇ is the operating wavelength of the power receiving device, and the distance from one end of the first antenna element to one end of the second antenna element adjacent to the one end of the first antenna element is a distance of ⁇ /64 or more. This makes it possible to prevent the antenna elements from interfering with each other and causing electromagnetic coupling, and realizes a multi-antenna that requires a small board area, is inexpensive to manufacture, and has excellent reception performance.
• (Appendix 7) The power receiving device of claim 6, wherein the distance from one end of the first antenna element to one end of the second antenna element adjacent to the one end of the first antenna element is a distance of ⁇ /32 or more, where ⁇ is the operating wavelength of the power receiving device.
• a power receiving device that receives energy wirelessly transmitted in a three-dimensional space based on wireless power transmission (WPT), comprising: a main body; one or more of the multi-antennas described in Appendix 5 built into the main body; and a circuit built into the main body and functionally coupled to a rectifier, wherein the circuit is arranged inside a region of a substrate surrounded by a first antenna element and a second antenna element so as not to overlap with the antenna elements.
• the circuit suppresses electromagnetic coupling between the first antenna element and the second antenna element, thereby improving the power receiving performance of the antenna.
• the substrate area can be reduced by the circuit area compared to a case where a means for suppressing electromagnetic coupling such as GND is separately arranged in an area surrounded by the antenna.
• a means for suppressing electromagnetic coupling such as GND
• Appendix 11 A power receiving device described in any one of appendices 8 to 10, wherein the circuit is arranged in a position that does not overlap with any antenna element included in the multi-antenna when viewed from a direction perpendicular to the surface of the substrate. In this way, by utilizing the circuit area as a means for suppressing electromagnetic coupling, it is possible to realize a power receiving device that requires a small board area, is inexpensive to manufacture, and has excellent power receiving efficiency.
• a power receiving device that receives energy wirelessly transmitted within a three-dimensional space based on wireless power transmission (WPT), comprising: a main body; one or more multi-antennas built into the main body; and a circuit built into the main body, wherein the multi-antennas include a substrate, two linear antennas arranged in an approximately cross shape so as to define the substrate into four regions, four linear antennas arranged on the four sides of an approximately square at the outermost side on the substrate so as to surround the four regions, and a connecting line that connects all six linear antennas in a single stroke clockwise or counterclockwise, wherein the circuit is provided inside any one of the four regions so as not to overlap with the linear antennas, and the circuit is functionally coupled via the connecting line and a rectifier.
• WPT wireless power transmission
• the circuit suppresses electromagnetic coupling between the linear antennas, thereby improving the power receiving performance of the antenna.
• the substrate area can be reduced by the circuit area compared to the case where a means for suppressing electromagnetic coupling such as GND is arranged in a separate area. In other words, by using the circuit area as a means for suppressing electromagnetic coupling, a power receiving device with a small substrate area, low manufacturing costs, and excellent power receiving efficiency can be realized.
• the power receiving device according to any one of claims 8 to 17, further comprising: a device built into the main body and capable of functioning based on energy received from the multi-antenna.
• IoT devices such as sensors and actuators formed integrally with the multi-antenna to function, and thus makes it possible to realize a small-sized power receiving device formed integrally with the multi-antenna that can function without a wired power supply.

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• 2023
  • 2023-02-24 JP JP2023027784A patent/JP7284550B1/ja active Active
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• 2024
  • 2024-02-08 EP EP24760157.8A patent/EP4672504A1/en active Pending
  • 2024-02-08 WO PCT/JP2024/004270 patent/WO2024176855A1/ja not_active Ceased
  • 2024-02-08 CN CN202480014421.1A patent/CN120770098A/zh active Pending
• 2025
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