JP2007192744A - Electromagnetic wave analyzer, design supporting device, electromagnetic wave analysis program, and electromagnetic wave analysis method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To check on the effect of unnecessary radiation noise arising from a printed circuit board mounted with components, as to an electronic apparatus including a radio apparatus. <P>SOLUTION: A design supporting device 100 includes an antenna electromagnetic field distribution input part 51 for thereinto inputting data showing the distribution of an electromagnetic field around an antenna on the periphery of an electronic apparatus, a near-substrate electromagnetic field distribution input part 52 for thereinto inputting data showing the distribution of a near-substrate electromagnetic field which is unnecessary radiation noise emitted from electronic components provided on substrates of the electronic apparatus, and a correlative value generation part 53 for generating the distribution of correlative values showing correlation between the electromagnetic field around the antenna and the near-substrate electromagnetic field based on the antenna electromagnetic field distribution data and on the near-substrate electromagnetic field distribution data. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an electromagnetic wave analysis device, a design support device, an electromagnetic wave analysis program, or an electromagnetic wave analysis method that can evaluate a transmission / reception function of an electronic device that transmits and receives an electromagnetic wave such as a mobile phone.

  In recent years, electronic devices typified by digital AV devices and portable information terminals have been reduced in size and functionality. With the downsizing and higher performance of electronic devices, the mounting density of printed circuit boards constituting the electronic devices is increased. In addition, the operating frequency of an IC (Integrated Circuit) mounted on the printed circuit board becomes high. As a result, electromagnetic interference (EMI: Electro Magnetic Interference) such as malfunction of electronic devices and transmission / reception failure due to electromagnetic waves radiated from the printed circuit board, that is, unnecessary radiation noise increases. In order to take measures against such EMI, much time and labor are required.

  Therefore, as a conventional EMI countermeasure, an apparatus for measuring the intensity of an electromagnetic field in the vicinity of a circuit board of an electronic device has been proposed (for example, Patent Document 1). This device brings a loop antenna close to the circuit board. At that time, a combined current of a current generated by the electric field existing between the circuit board and the loop antenna and a current generated by the magnetic field flows through the loop antenna. By measuring this combined current, the electric field component and magnetic field component of the electromagnetic field near the circuit board can be measured.

There has also been proposed an apparatus for displaying an intensity distribution diagram of noise due to electromagnetic waves radiated from a substrate and image data in an overlapping manner (for example, Patent Document 2). In this apparatus, noise due to electromagnetic waves radiated from the substrate is measured by scanning the substrate with a small antenna probe for noise detection. The measured noise is subjected to frequency analysis by a spectrum analyzer. The noise intensity distribution obtained based on the analysis result is displayed on the display so as to be superimposed on the image data of the substrate.
JP 2000-206163 A JP 2000-19204 A

  The influence of unnecessary radiation noise generated from a circuit board on an electromagnetic wave transmission / reception function of an electronic device cannot be ignored due to an increase in operating frequency of an IC mounted on the circuit board. However, the above conventional technique is merely a proposal of an apparatus for measuring an electromagnetic wave generated from an electronic device. In other words, no device or method has been proposed for obtaining information about how unwanted radiation noise generated from an electronic device affects the transmission and reception of electromagnetic waves performed by the electronic device. Therefore, for example, in the design of an electronic device such as a mobile phone, there is a problem that it is difficult to obtain information about the presence / absence of a transmission / reception failure due to unnecessary radiation noise and the occurrence location.

  The present invention has been made to solve the above-described problems, and an electromagnetic wave analysis device, a design support device, and a design support device that can obtain information on the influence of unwanted radiation noise of an electronic device on the transmission / reception function of the electronic device, An object is to provide an electromagnetic wave analysis program or a design support program.

  An electromagnetic wave analysis apparatus according to the present invention is an electromagnetic wave analysis apparatus for examining the influence of unnecessary radiation noise generated from a circuit board of an electronic device that transmits and receives electromagnetic waves via an antenna on the electromagnetic waves that are transmitted and received via the antenna. An antenna electromagnetic field distribution input unit for inputting antenna electromagnetic field distribution data representing a distribution of the electromagnetic field of the antenna, which is a magnetic field component or an electric field component of electromagnetic waves transmitted and received via the antenna, and an electron provided on the circuit board Substrate near-field electromagnetic field distribution input unit for inputting near-field electromagnetic field distribution data representing the distribution of the electric field component and / or magnetic field component of the near electromagnetic field due to unwanted radiation noise generated from the component, the antenna electromagnetic field distribution data, and the antenna Correlation between the electromagnetic field of the antenna and the electromagnetic field near the substrate based on the electromagnetic field distribution data near the substrate And a correlation value generation unit for generating a distribution of correlation values representative.

  The electromagnetic wave analysis program according to the present invention executes a process for examining, on a computer, the effect of unnecessary radiation noise generated from a circuit board of an electronic device that transmits and receives electromagnetic waves via an antenna on the electromagnetic waves that are transmitted and received via the antenna. An electromagnetic field distribution input process for inputting antenna electromagnetic field distribution data representing an electromagnetic field distribution of an antenna that is a magnetic field component or an electric field component of an electromagnetic wave transmitted and received via the antenna; Substrate near-field electromagnetic field distribution input processing for inputting near-field electromagnetic field distribution data representing the distribution of the electric field component and / or magnetic field component of the near electromagnetic field due to unwanted radiation noise generated from electronic components provided on the circuit board, and the antenna Based on the electromagnetic field distribution data and the substrate vicinity electromagnetic field distribution data, To perform a correlation value generation process of generating a distribution of correlation values representing the correlation between the electromagnetic field and the substrate near electromagnetic field of antenna to the computer.

  The electromagnetic wave analysis method according to the present invention uses a computer to examine the influence of unwanted radiation noise generated from a circuit board of an electronic device that transmits and receives electromagnetic waves via an antenna on the electromagnetic waves that are transmitted and received via the antenna. In the analysis method, the antenna electromagnetic field distribution input unit provided in the computer inputs antenna electromagnetic field distribution data representing the electromagnetic field distribution of the antenna that is a magnetic field component or an electric field component of electromagnetic waves transmitted and received via the antenna. And the vicinity of the board representing the distribution of the electric field component and / or the magnetic field component of the near electromagnetic field due to unwanted radiation noise generated from the electronic components provided on the circuit board. A step of inputting electromagnetic field distribution data, and a correlation value generation unit provided in the computer, Serial based on the antenna electromagnetic field distribution data and said substrate near electromagnetic field distribution data, and a step of generating a distribution of correlation values representing the correlation between the substrate near electromagnetic field and the electromagnetic field of the antenna.

  According to the present invention, it is possible to obtain an electromagnetic wave analysis device, a design support device, an electromagnetic wave analysis program, or a design support program that can obtain information on the influence of unwanted radiation noise of an electronic device on the transmission / reception function of the electronic device.

  As described above, the electromagnetic wave analysis apparatus according to the present invention is an electromagnetic wave for investigating the influence of unnecessary radiation noise generated from a circuit board of an electronic device that transmits and receives an electromagnetic wave via an antenna on the electromagnetic wave that is transmitted and received via the antenna. An antenna electromagnetic field distribution input unit for inputting antenna electromagnetic field distribution data representing an electromagnetic field distribution of an antenna that is a magnetic field component or an electric field component of an electromagnetic wave transmitted and received via the antenna, and the circuit board A near-field electromagnetic field distribution input unit for inputting near-field electromagnetic field distribution data representing the distribution of the electric field component and / or magnetic field component of the near electromagnetic field due to unwanted radiation noise generated from an electronic component provided in the electronic component; and the antenna electromagnetic field Based on the distribution data and the near-field electromagnetic field distribution data, the antenna electromagnetic field and the near-field electromagnetic field are obtained. And a correlation value generation unit for generating a distribution of correlation values representing the correlation of the field Prefecture.

  According to the electromagnetic wave analysis apparatus according to the present invention, the antenna electromagnetic field distribution input unit inputs antenna electromagnetic field distribution data at the time of electromagnetic wave transmission / reception of the electronic device, and the board vicinity electromagnetic field distribution input unit receives from the electronic component of the circuit board. Inputs near-field electromagnetic field distribution data representing unnecessary radiation noise. A correlation value generation unit generates a distribution of correlation values based on these two distribution data. The generated correlation value distribution is a distribution of correlation values representing the correlation between the antenna electromagnetic field distribution and the near-field electromagnetic field distribution. Therefore, the influence of unwanted radiation noise from the electronic component on the antenna electromagnetic field, that is, from the electronic component It is distribution of the value showing the influence which the unnecessary radiation noise which generate | occur | produces has on the electromagnetic waves transmitted and received by the electronic device. Therefore, data indicating the influence of unwanted radiation noise generated from the electronic component on the electromagnetic wave transmission / reception function of the electronic device can be obtained from the correlation value distribution.

  Further, the correlation value distribution is obtained by an apparatus having a simple configuration including an antenna electromagnetic field distribution input unit, a substrate near electromagnetic field distribution input unit, and a correlation value generation unit. Therefore, information about the influence of unnecessary radiation noise of the electronic device on the transmission / reception function of the electronic device can be easily obtained.

  The board near electromagnetic field distribution data is data representing an electromagnetic field caused by unnecessary radiation noise generated from components among unnecessary radiation noise generated from the entire board. For this reason, the size of the near-field electromagnetic field distribution data input by the near-field electromagnetic field distribution input unit is smaller than data representing the electromagnetic field of the entire substrate. As a result, the correlation value generation unit can generate a correlation value distribution with a small amount of calculation.

  In the electromagnetic wave analyzing apparatus according to the present invention, the near-field electromagnetic field distribution input unit includes an electric field component or a magnetic field component of a near electromagnetic field caused by unnecessary radiation noise generated from wiring connecting the electronic components provided on the circuit board, or It is preferable that data representing both distributions is further input as the near-field electromagnetic field distribution data.

  Thereby, not only the unnecessary radiation noise generated from the electronic component but also data indicating the influence of the unnecessary radiation noise generated from the wiring on the transmission / reception function via the antenna of the electronic device can be obtained.

  The electromagnetic wave analysis device according to the present invention further includes a comparison unit that determines whether or not there is an electromagnetic wave transmission / reception failure in the electronic device by comparing each correlation value in the correlation value distribution with a predetermined threshold value. It is preferable to provide.

  The comparison unit compares each correlation value in the correlation value distribution with a determination threshold to determine whether or not an electromagnetic wave transmission / reception failure has occurred due to unnecessary radiation noise at each position in the correlation value distribution. Can do. Therefore, the electromagnetic wave transmission / reception failure location in the correlation value distribution is specified. As a result, it is possible to obtain information about whether or not a problem has occurred due to unnecessary radiation noise in the electronic device, and where the problem has occurred. As a result, the information regarding the electronic component which generates the unnecessary radiation noise which causes the electromagnetic wave transmission / reception failure is obtained.

  In the electromagnetic wave analyzing apparatus according to the present invention, it is preferable that the correlation value includes a product of an electromagnetic field value of the antenna and a near-field electromagnetic field value.

  By calculating the correlation value by the product of the electromagnetic field value of the antenna and the electromagnetic field value near the substrate, a correlation value indicating the correlation between the electromagnetic field of the antenna and the electromagnetic field near the substrate can be obtained by a simple calculation process. Can be sought.

  In the electromagnetic wave analysis device according to the present invention, it is preferable that the correlation value generation unit further generates a maximum value, a minimum value, or both of the correlation values as an evaluation value.

  Since the correlation value generation unit generates the evaluation value, a value is obtained that quantitatively represents the influence of unwanted radiation noise generated from a circuit board of an electronic device on electromagnetic waves transmitted and received via the antenna. It is done.

  In the electromagnetic wave analysis device according to the present invention, the antenna electromagnetic field distribution data and the substrate near-field electromagnetic field distribution data are data represented by vectors at each coordinate, and the correlation value generation unit has coordinates corresponding to each other. The correlation value distribution is generated by calculating a correlation value using a product of at least one component of the vector of the antenna electromagnetic field distribution data and the component of the vector of the near-field electromagnetic field distribution data. It is preferable.

  The correlation value generation unit can generate a correlation value for at least one direction. That is, a correlation value can be obtained in consideration of the directionality of the electromagnetic field of the antenna and the directionality of the near-field electromagnetic field.

  In the electromagnetic wave analysis apparatus according to the present invention, the distribution of the electromagnetic field of the antenna, which is a magnetic field component or an electric field component of the electromagnetic wave transmitted and received via the antenna, is determined by measuring the electromagnetic field around the electronic device, and the antenna It is preferable to provide an antenna electromagnetic field distribution measurement unit that is passed as antenna electromagnetic field distribution data to the electromagnetic field distribution input unit.

  Since the antenna electromagnetic field distribution measurement unit obtains the antenna electromagnetic field distribution data, the antenna electromagnetic field distribution input unit can obtain the input data.

  In the electromagnetic wave analysis apparatus according to the present invention, the distribution of the electric field component and / or the magnetic field component of the near electromagnetic field due to unnecessary radiation noise radiated from the electronic component provided on the circuit board of the electronic device when the electronic device operates. Is preferably obtained by measuring an electromagnetic field around the electronic component, and further includes a board vicinity electromagnetic field distribution measurement unit that passes the board vicinity electromagnetic field distribution input unit as board vicinity electromagnetic field distribution data.

  Since the near-field electromagnetic field distribution measurement unit obtains near-field electromagnetic field distribution data, the near-field electromagnetic field distribution input unit can obtain input data.

  In the electromagnetic wave analysis device according to the present invention, the distribution of the electromagnetic field of the antenna, which is a magnetic field component or an electric field component of the electromagnetic wave transmitted and received via the antenna, is obtained by a simulation analyzing the electromagnetic field around the electronic device, and the antenna It is preferable to further include an antenna electromagnetic field distribution analysis unit that passes the data to the electromagnetic field distribution input unit as antenna electromagnetic field distribution data.

  Since the antenna electromagnetic field distribution analysis unit obtains the antenna electromagnetic field distribution data, the antenna electromagnetic field distribution input unit can obtain the input data.

  The electromagnetic wave analysis device according to the present invention is a distribution of an electric field component and / or a magnetic field component of a near electromagnetic field due to unnecessary radiation noise radiated from an electronic component provided on a circuit board of the electronic device when the electronic device operates. Is preferably obtained by simulation for analyzing the electromagnetic field around the electronic component, and further includes a board vicinity electromagnetic field distribution analysis unit that passes the board vicinity electromagnetic field distribution input unit as board vicinity electromagnetic field distribution data.

  Since the board vicinity electromagnetic field distribution analysis unit obtains the board vicinity electromagnetic field distribution data, the board vicinity electromagnetic field distribution input unit can obtain input data.

  An electromagnetic wave analysis device according to the present invention represents a component noise storage unit that stores data representing unnecessary radiation noise generated from an electronic component for a plurality of electronic components, and an arrangement of electronic components provided on a circuit board of the electronic device. A component data input unit for inputting component data, and data representing unnecessary radiation noise generated from the electronic component represented by the component data are read from the component noise storage unit, and the read data and the component data are It is preferable to further include a noise data generation unit that generates the substrate vicinity electromagnetic field distribution data using the generated data and passes it to the substrate vicinity electromagnetic field distribution input unit.

  The noise data generation unit calculates the near-field electromagnetic field distribution data based on the component data input by the component data input unit and data representing unnecessary radiation noise generated from the electronic component represented by the component data. Generate. Substrate vicinity electromagnetic field distribution data generated by the noise data generation unit is passed to the substrate vicinity electromagnetic field distribution input unit. In the correlation value distribution generation, a correlation value is generated based on the board vicinity electromagnetic field distribution data input by the board vicinity electromagnetic field distribution input unit and the antenna electromagnetic field distribution data. Therefore, the generated correlation value is data representing the influence of unnecessary radiation noise of the electronic component indicated by the component data on the transmission / reception function of the electronic device. That is, information about the influence of the component arrangement indicated by the component data on the transmission / reception function of the electronic device can be obtained. For example, when the component data input unit inputs data indicating the arrangement of the electronic component at the initial stage of electronic device design as the component data, the arrangement of the electronic component becomes the transmission / reception function of the electronic device at the initial stage of electronic device design. Information indicating what effect it has is obtained.

  The electromagnetic wave analysis device according to the present invention is based on the wiring data, a wiring pattern generation unit that generates wiring data indicating a wiring pattern connected to an electronic component provided on the circuit board, based on the component data, Generates data representing the distribution of the electric field component and / or magnetic field component of the near electromagnetic field due to unwanted radiation noise generated from the wiring, and inputs the generated data as the board near electromagnetic field distribution data as the board near electromagnetic field distribution data It is preferable to further include a wiring noise data generation unit to be passed to the unit.

  The wiring noise data generation unit generates data representing unnecessary radiation noise generated from wiring connected to the electronic component represented by the component data as near-field electromagnetic field distribution data. The correlation value generation unit generates a correlation value using near-board electromagnetic field distribution data representing unnecessary radiation noise generated from the wiring in addition to near-board electromagnetic field distribution data of the electronic component indicated by the component data. Therefore, the generated correlation value includes data representing the influence of unnecessary radiation noise of the wiring connected to the electronic component indicated by the component data on the transmission / reception function of the electronic device.

  An electromagnetic wave analysis apparatus according to the present invention includes an antenna electromagnetic field distribution storage unit that stores the antenna electromagnetic field distribution data for a plurality of antennas, an antenna data input unit that inputs data related to an antenna in the electronic device, and the antenna data. An antenna electromagnetic field distribution selection unit that reads antenna electromagnetic field distribution data corresponding to the antenna represented by the antenna electromagnetic field distribution storage unit and passes the antenna electromagnetic field distribution data to the antenna electromagnetic field distribution input unit as antenna electromagnetic field distribution data. It is preferable to provide.

  By using antenna data, antenna magnetic field distribution data can be obtained without performing measurement or simulation. For example, the antenna electromagnetic field distribution storage unit can store antenna electromagnetic field distribution data obtained by past measurement or simulation for a certain antenna. In this case, when data related to the antenna is input by the antenna data input unit, the antenna electromagnetic field distribution selection unit reads the antenna electromagnetic field distribution data of the antenna from the antenna electromagnetic field distribution storage unit, and the antenna electromagnetic field distribution. Can be passed to the input section.

  In the electromagnetic wave analysis device according to the present invention, the electronic device may be a mobile phone.

  In the electromagnetic wave analysis device according to the present invention, the antenna electromagnetic field distribution data is an antenna current in which a magnetic field component of an electromagnetic wave transmitted and received via the antenna is represented by a current or an antenna voltage in which the electric field component of the electromagnetic wave is represented by a voltage. It can be set as the aspect which is the data showing distribution.

  The design support apparatus according to the present invention may include an electromagnetic wave analysis apparatus according to the present invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[First Embodiment]
In the present embodiment, two types of distribution data, ie, a near-field electromagnetic field distribution of unwanted radiation noise radiated from an electronic component provided on a printed circuit board of a cellular phone and an antenna electromagnetic field distribution at the time of transmission / reception of an electronic device, are distributed. The present invention relates to a design support apparatus that evaluates transmission / reception characteristics in a state close to actual use of a mobile phone.

  FIG. 1 is a functional block diagram showing the configuration of the design support apparatus according to the present embodiment. As shown in FIG. 1, the design support apparatus 100 includes an antenna electromagnetic field distribution measuring unit 12, a substrate near electromagnetic field distribution measuring unit 13, and a computer 15 connected thereto. The computer 15 is also connected to the CAD system 57. The computer 15 includes an interface unit 16, a calculation unit 17, a storage unit 18, and an output unit 19.

  The antenna electromagnetic field distribution measurement unit 12 measures a magnetic field component of an electromagnetic wave transmitted / received via an antenna of a mobile phone. The board vicinity electromagnetic field distribution measurement unit 13 measures an electromagnetic field caused by unnecessary radiation noise radiated from an electronic component provided on a circuit board of a mobile phone. Details of the antenna electromagnetic field distribution measurement unit 12 and the board vicinity electromagnetic field distribution measurement unit 13 will be described later.

  The interface unit 16 includes an antenna electromagnetic field distribution input unit 51, a board near electromagnetic field distribution input unit 52, and a control unit 59. The antenna electromagnetic field distribution input unit 51 receives the antenna magnetic field distribution data from the antenna electromagnetic field distribution measurement unit 12 and stores it in the storage unit 18. The board vicinity electromagnetic field distribution input unit 52 receives the board vicinity electromagnetic field distribution data from the board vicinity electromagnetic field distribution measurement unit 13 and stores it in the storage unit 18. The control unit 59 controls the operations of the antenna electromagnetic field distribution measurement unit 12 and the board vicinity electromagnetic field distribution measurement unit 13. Such control is performed, for example, by executing a control software by a CPU (described later) included in the computer 15.

  The calculation unit 17 includes a correlation value generation unit 53, a comparison unit 54, a board design data input unit 55, and a pointer information generation unit 56. The correlation value generation unit 53 generates a correlation value based on the antenna magnetic field distribution data and the board vicinity electromagnetic field distribution data stored in the storage unit 18. The comparison unit 54 evaluates the mobile phone by comparing the correlation value generated by the correlation value generation unit 53 with the threshold value stored in the storage unit 18, and stores data representing the evaluation result in the storage unit 18. To do. The board design data input unit 55 inputs board design data representing the structure of the board 14a from, for example, the CAD system 57 or the like. Based on the board design data and the result data stored in the storage unit 18, the guideline information generation unit 56 generates design guideline data serving as a mobile phone design guideline and stores it in the storage unit 18.

  The output unit 19 displays the result data and design guideline data stored in the storage unit 18 using a display or the like (described later) so that the designer can easily understand.

  The computer 15 can be configured using, for example, an EWS (Engineering Work Station) or a PC (Personal Computer) (hereinafter referred to as a PC or the like). The functions of the interface unit 16 and the calculation unit 17 can be realized by a CPU such as a PC executing a design support program. The storage unit 18 includes a storage medium such as a hard disk and a RAM built in the PC, a portable storage medium such as a flexible disk and a memory card, a storage medium in a storage device on the network, and the like. Can be used. As the output unit 19, a display device including a display such as a PC or an output device such as a printer can be used.

  Installing a design support program for realizing the functions of the interface unit 16 and the arithmetic unit 17 on an arbitrary PC or the like from a storage medium such as a CD-ROM or by downloading via a communication line, for example. Thus, the computer 15 can also be constructed.

  The design support apparatus 100 according to the present invention is not limited to the case where the computer 15 is a general-purpose apparatus such as a PC. For example, the computer 15 may be a dedicated control device having a CPU or a storage medium, or the antenna electromagnetic field distribution measurement unit 12 and the board vicinity electromagnetic field distribution measurement unit 13 and the computer 15 are integrated into one design support device. It may be configured.

  Next, the details of the antenna electromagnetic field distribution measurement unit 12 and the board vicinity electromagnetic field distribution measurement unit 13 will be described. FIG. 2A is a functional block diagram showing the configuration of the design support apparatus 100 including the detailed configurations of the antenna electromagnetic field distribution measurement unit 12 and the board vicinity electromagnetic field distribution measurement unit 13, and a schematic diagram of a mobile phone substrate. It is.

  As shown in FIG. 2A, the antenna electromagnetic field distribution measurement unit 12 includes a measuring device (for antenna magnetic field component) 12a and a detector (for antenna magnetic field component) 12b. The board near electromagnetic field distribution measurement unit 13 includes a measuring instrument (for board near electromagnetic field) 13a and a detector (for board near electromagnetic field) 13b. A board 14a shown in FIG. 2A is a circuit board of a mobile phone to be measured.

  The antenna electromagnetic field distribution measurement unit 12 measures the magnetic field component of the electromagnetic wave generated by the antenna radiated from the substrate 14a, that is, the distribution of the magnetic field component of the antenna. The magnetic field component of the antenna will be described later. The board vicinity electromagnetic field distribution measurement unit 13 measures the electromagnetic field distribution caused by unnecessary radiation noise radiated from the electronic component provided on the board 14a. The computer 15 controls the antenna electromagnetic field distribution measurement unit 12 and the board vicinity electromagnetic field distribution measurement unit 13 and processes data output from them.

  The board 14a includes an antenna 32, an RF circuit block 33, a memory 34, a CPU (Central Processing Unit) 35, and power supplies 36 and 37 as electronic components. Each electronic component is connected by wiring 38. The memory 34, the CPU 35, and the power sources 36 and 37 are configured by, for example, an IC (Integrated Circuit).

  Transmission / reception of electromagnetic waves on the substrate 14 a is performed via the antenna 32. For example, when a mobile phone including the substrate 14a performs a telephone call, Internet access, or the like by wireless communication, an electromagnetic wave is transmitted from the antenna 32 or received by the antenna 32.

  As described above, the magnetic field component of the antenna is a magnetic field component of electromagnetic waves transmitted and received via the antenna 32 provided in an electronic device such as a mobile phone. This antenna magnetic field component distribution is the antenna magnetic field distribution. Also, the antenna magnetic field component represented by current is referred to as antenna current.

  In addition, the antenna in an electronic device shall contain not only the antenna mounted as components but all the members which function substantially as an antenna in an electronic device. For example, the antenna 32 of the mobile phone 14 as shown in FIG. 2B and a part or the whole of the housing may function as the antenna.

  The detector (for antenna magnetic field component) 12b detects the magnetic field component of the antenna around the substrate 14a. The detector 12b includes, for example, a detection antenna (not shown). When the detection antenna is disposed in the periphery of the substrate 14a, a current flows through the detection antenna due to electromagnetic coupling between the antenna 32 and the detection antenna. The measuring device 12a measures this current, whereby the magnetic field component of the electromagnetic wave radiated from the antenna 32 is measured. Since the magnetic field component of the electromagnetic wave and the current have a relationship of I (current) = μB (magnetic flux density), if one of the values is obtained, the other value can also be obtained by calculation.

  Similarly, if either value is obtained for the electric field component and voltage of the electromagnetic wave, the other value can also be obtained by calculation. In this embodiment, the magnetic field component of the electromagnetic wave radiated from the antenna is measured and the magnetic field component of the antenna is obtained. However, the electric field component of the antenna is obtained by measuring the electric field component instead of the magnetic field component. May be. The electric field component of the antenna is an electric field component of electromagnetic waves radiated from the antenna. Further, instead of the electric field component of the antenna, an antenna voltage representing the electric field component of the antenna as a voltage may be obtained.

  Further, the detector 12b moves around the substrate 14a, whereby the magnetic field component of the antenna is measured at a plurality of locations. As a result, the magnetic field distribution of the antenna around the substrate 14a is obtained.

  For example, a spectrum analyzer is used as the measuring instrument 12a. By using the spectrum analyzer, it is possible to output an intensity distribution, that is, a spectrum for each frequency of the magnetic field component of the antenna detected by the detector 12b.

  By the way, in the operation state of the substrate 14a, electromagnetic waves that are unnecessary radiation noises are generated from the memory 34, the CPU 35, and the power sources 36 and 37, respectively. Further, a high frequency current having a multiplied frequency caused by the clock frequency, the switching speed, or the like flows through the wiring 38 routed between the memory 34, the CPU 35, and the power supplies 36 and 37. As a result, electromagnetic waves that are unnecessary radiation noise are radiated to the periphery of the substrate via the wiring 38. The detector detector (for near-substrate electromagnetic field) 13b detects the electric field component and magnetic field component of unnecessary radiation noise radiated from the memory 34, the CPU 35, and the power sources 36 and 37.

  Usually, the intensity of unwanted radiation noise is very small compared to the intensity of electromagnetic waves radiated from an antenna. Therefore, the configuration of the detector detector (for near-field electromagnetic field) 13b for detecting the electric field component and magnetic field component of unwanted radiation noise is smaller than that of the detector (for antenna magnetic field component) 12b. A configuration suitable for measuring a magnetic field and an electric field is preferable. Further, unnecessary radiation noise is often measured in the vicinity of the substrate because the intensity is small. For this reason, the distribution of unwanted radiation noise is sometimes referred to as a near electromagnetic field distribution.

  For example, the detector 13b includes a minute antenna (not shown). When the minute antenna approaches an electronic component provided on the substrate 14a, an electrostatic coupling current due to electrostatic coupling generated between the electronic component and the minute antenna, and an electromagnetic coupling current due to electromagnetic coupling generated between the electronic component and the minute antenna. And the combined current flows through the minute antenna. The measuring device 13a measures this combined current, thereby detecting an electromagnetic wave radiated from the electronic component, that is, an electric field component and a magnetic field component of unnecessary radiation noise.

  As the measuring instrument 13a, for example, a spectrum analyzer is used similarly to the measuring instrument 12a. Note that the measuring instrument 13a does not necessarily need to measure both the electric field component and the magnetic field component of unnecessary radiation noise, and may measure at least one of them. What is measured by the detector 13b and the measuring device 13a is not limited to the electric field component and magnetic field component of unwanted radiation noise radiated from the memory 34, the CPU 35, and the power sources 36 and 37. For example, the detector 13b and the measuring device 13a may measure unnecessary radiation noise radiated from electronic components other than the above-described electronic components provided on the substrate 14a and unnecessary radiation noise radiated from the wiring of the substrate 14a. Good.

  In the detector 12b and the detector 13b, portions other than the detection antenna and the minute antenna are preferably covered with a shield in order to remove the influence from external noise.

  The antenna electromagnetic field distribution measurement unit 12 and the substrate vicinity electromagnetic field distribution measurement unit 13 preferably include a moving device (not shown) that moves the detector 12b and the detector 13b around the substrate 14a. As the detectors 12b and 13b move around the substrate 14a, the antenna magnetic field distribution and the substrate near electromagnetic field distribution around the substrate can be obtained.

  Since the design support apparatus 100 includes two measurement units, that is, the antenna electromagnetic field distribution measurement unit 12 and the board vicinity electromagnetic field distribution measurement unit 13, the computer 15 controls these so that the board near electromagnetic field distribution and the antenna Simultaneous measurement of magnetic field components becomes possible. Therefore, it is possible to make equipment common and shorten the measurement time.

  Also, instead of obtaining the antenna magnetic field distribution and the near-field electromagnetic field distribution by moving the detectors 12b and 13b, a plurality of detectors 12b and 13b are provided, and these detectors are arranged in a matrix, for example. By doing so, it is possible to obtain the magnetic field distribution of the antenna and the electromagnetic field distribution in the vicinity of the substrate.

  Note that the antenna electromagnetic field distribution measurement unit 12 and the substrate vicinity electromagnetic field distribution measurement unit 13 are shown here as examples. In order to measure the antenna magnetic field distribution and the substrate vicinity electromagnetic field distribution, another method is required. A measurement system may be used.

  FIG. 3 is a functional block diagram showing another configuration example of another measurement system and showing another configuration example of the measurement unit that measures the magnetic field distribution of the antenna and the electromagnetic field distribution in the vicinity of the substrate. As shown in FIG. 3, the measuring unit 21 that measures the magnetic field distribution of the antenna and the electromagnetic field distribution in the vicinity of the substrate can be configured by one measuring device 21a and one detector 21b. The detector 21b includes, for example, a detection antenna for detecting a magnetic field component of the antenna and a minute antenna for detecting a near-field electromagnetic field. The measuring instrument 21a measures the magnetic field component of the antenna and the near-field electromagnetic field detected by the detector 21b. For example, a spectrum analyzer is used as the measuring instrument 21a. With the configuration shown in FIG. 3, the facilities can be shared.

  Next, the operation of the design support apparatus 100 will be described with reference to the drawings. FIG. 4 is a flowchart showing the processing operation in the design support apparatus 100.

  In FIG. 4, first, the computer 15 sets measurement conditions for the antenna electromagnetic field distribution measurement unit 12 and the board vicinity electromagnetic field distribution measurement unit 13 (steps S11 and S12). For example, the calculator 15 sets initial conditions necessary for measurement, such as a measurement frequency, a spatial pitch, and a measurement range, as measurement conditions.

  The measuring instrument (for antenna magnetic field component) 12a measures the magnetic field component of the antenna according to the setting conditions set in step S11 under the control of the control unit 59 (step S13). Here, in FIG. 2A, a plane parallel to the substrate 14a, which is a measurement object, is an XY plane, and a direction perpendicular to the substrate 14a is a Z-axis direction. For example, when the detector 13b moves on a plane that is parallel to the XY plane and is at a certain distance from the substrate 14a, the magnetic field distribution of the antenna on the plane that is spaced a certain distance from the substrate 14a is measured. Is done. By performing such measurement on a plurality of planes parallel to the XY plane, data indicating the antenna magnetic field distribution around the substrate 14a can be obtained. The measurement area is not limited to a flat surface. For example, the distribution on the spherical surface or curved surface around the substrate 14a may be measured.

  The antenna magnetic field distribution is measured, for example, in a state where the mobile phone is actually transmitting and receiving. As a simple method, an antenna is attached to the antenna feeding point, and the magnetic field distribution of the antenna can be measured in a state where the antenna is excited at a predetermined frequency.

  In the measurement of the antenna magnetic field distribution, when the substrate 14a is the main substrate of a mobile phone, the antenna magnetic field in the entire periphery of the mobile phone 14 is also included, as shown in FIG. It is preferred to measure the components. This is because the entire mobile phone including the housing may function as an antenna. Note that the cellular phone 14 or the substrate 14a measured here may be a prototype at the initial stage of design or a completed product.

  The antenna magnetic field distribution measured by the antenna electromagnetic field distribution measuring unit 12 is input to the computer 15 by the antenna electromagnetic field distribution input unit 51 and stored in the storage unit 18 (step S15). The input antenna magnetic field distribution data includes, for example, information indicating the position such as the coordinates of the measurement point, information indicating the frequency, intensity, phase, and directionality of the magnetic field component of the antenna. In addition, when multiple measurements are performed to reduce measurement variation, the data indicating the average value of the measured values and the data indicating the maximum value of the measured values when the measurement accuracy is poor include the antenna magnetic field distribution data. May be included.

  FIG. 6A is an example of an image when the magnetic field distribution of the antenna represented by the antenna magnetic field distribution data is displayed on the XY coordinates. In FIG. 6A, the magnetic field distribution of the antenna is represented by a line connecting points where the magnetic field components of the antenna have the same value on the XY plane. In FIG. 6A, the region surrounded by the closed curve h is the region where the antenna magnetic field is the largest in the XY plane. The XYZ directions shown in FIG. 6A correspond to the XYZ directions in the substrate 14a shown in FIG. The board | substrate 14a is located in the area | region of X = 0-X1, Y = 0-Y1.

  The measuring instrument (for board near electromagnetic field) 13a measures the board near electromagnetic field, that is, unnecessary radiation noise, in accordance with the setting conditions set in step S12 (step S14). For example, when the detector 13b moves in a three-dimensional direction within the measurement range around each electronic component provided on the substrate 14a, the near-substrate electromagnetic field of unwanted radiation noise radiated from each electronic component is measured. The As a result, data indicating the near-substrate electromagnetic field distribution of unnecessary radiation noise by each electronic component is obtained. In the present embodiment, as an example, the measuring instrument 13a measures the electric field component and the magnetic field component of unnecessary radiation noise radiated from the memory 34, the CPU 35, and the power supplies 36 and 37 provided on the substrate 14a, respectively.

  For example, when the substrate 14a is a main substrate of a mobile phone, the electromagnetic wave of unnecessary radiation noise radiated from an electronic component provided on the substrate is small. It is preferable that measurement is performed with the detector 13b approached using the electronic component as an object to be measured.

  In addition, a mobile phone may be provided with various applications such as a display, a camera, and an SD card (memory card). By measuring the near-field electromagnetic field distribution in a state where any one of these applications is operated, unnecessary radiation noise due to the operated application can be measured. That is, it is possible to measure unnecessary radiation noise in a state that is actually close to the use state.

  The board vicinity electromagnetic field distribution measured by the board vicinity electromagnetic field distribution measurement unit 13 is input to the computer 15 by the board vicinity electromagnetic field distribution input unit 52 and stored in the storage unit 18 as board vicinity electromagnetic field distribution data ( Step S16). The input near-field electromagnetic field distribution data includes, for example, information indicating the position such as the coordinates of the measurement point, information indicating the frequency, intensity, phase, and direction of the magnetic field or electric field. In addition, when multiple measurements are performed to reduce measurement variation, data indicating the average value of the measured values is displayed, and when the measurement accuracy is poor, data indicating the maximum value of the measured values is an electromagnetic field near the substrate. Distribution data may be included.

  FIG. 6B shows an image in the case where the near-field electromagnetic field distribution of unnecessary radiation noise radiated from the memory 34, the CPU 35, and the power sources 36 and 37 represented by the near-field electromagnetic field distribution data is displayed on the XY coordinates. It is an example. In FIG. 6B, the area surrounded by the square g34 is surrounded by the electromagnetic field distribution near the substrate of the memory 34, and the area surrounded by the square g35 is surrounded by the electromagnetic field distribution near the board of the CPU 35 by the squares g36 and 37. The regions represent the near-substrate electromagnetic field distributions of the power supplies 36 and 37, respectively. In the squares g34, 35, 36, and 37, the near-substrate electromagnetic field distribution is represented by a line connecting points having the same magnetic field component. The XYZ direction shown in FIG. 6B corresponds to the XYZ direction in the substrate 14a shown in FIG. The board | substrate 14a is located in the area | region of X = 0-X1, Y = 0-Y1.

  The correlation value generation unit 53 generates a correlation value based on the antenna magnetic field distribution data and the board vicinity electromagnetic field distribution data input in steps S15 and S16 (step S17 in FIG. 4). The correlation value is a value that represents the degree of influence of the near-substrate electromagnetic field, that is, unwanted radiation noise, on the magnetic field component of the antenna. The correlation value is obtained for each measurement position by a calculation formula including the correlation between the antenna magnetic field component and the near-field electromagnetic field. The correlation value is obtained, for example, for a portion where the antenna electromagnetic field distribution shown in FIG. 6A and the substrate near-field distribution shown in FIG. 6B overlap. Hereinafter, an example of calculation for obtaining the correlation value will be described.

(Example 1 for calculating correlation value)
For example, the coordinates (x _1, y _{1, z. 1)} the correlation value at the position of A (x _1, y _one, z ₁₎ is obtained by the following equation (1).

(Formula 1)
A (x ₁ , y ₁ , z ₁ ) = ka ² + ma · b + nb ²
k, m, and n are the strength of the magnetic field component of the antenna at the constant a: (x ₁ , y ₁ , z ₁ ) b: the strength of the near-field electromagnetic field at (x ₁ , y ₁ , z ₁ )

  Further, the correlation value A may be obtained by the following (formula 2) by simplifying the calculation.

(Formula 2)
A (x ₁ , y ₁ , z ₁ ) = ma · b
m is the strength of the magnetic field component of the antenna at a constant a: (x ₁ , y ₁ , z ₁ ) b: the strength of the near-field electromagnetic field at (x ₁ , y ₁ , z ₁ ) Constants such as k, m, n are It is preferable to set an appropriate value according to the situation in consideration of the relationship with the threshold value described later.

(Example 2 for calculating correlation value)
In the above (Expression 1) and (Expression 2), the correlation value is obtained using the strength a of the magnetic field component of the antenna and the strength b of the electromagnetic field in the vicinity of the substrate. Instead, the correlation value can also be obtained using a value representing the magnetic field component of the antenna and the electromagnetic field near the substrate by a vector value. The correlation value generation unit 53, for example, in the _{(x 1, y 1, z} 1) of the antenna in the magnetic field component vector _{a = (a x, a y} , a z) and, _{(x 1, y 1, z} 1) Using the near-field electromagnetic field vector b = (b _x , b _y , b _z ), the correlation value A can be obtained by the following (Equation 3).

(Formula 3)
A = {(a _x · b _x ) ² + (a _y · b _y ) ² + (a _z · b _z ) ² } ^1/2

Above (Equation 3), xyz components of a vector _{a (a x, a y,} a z) and the vector b xyz components _{(b x, b y, b} z) of each vector represented by the product (a _x · b _x, is set to _{a y · b y, a z} · b z) of the magnitude correlation value a. The correlation value generation unit 53 may obtain the correlation value A as a product of at least one of the xyz components. For example, using the product a _y · b _y the product a _x · b _x and y components in the x component, it is also possible to obtain the correlation value A by the following (Equation 4).

(Formula 4)
_{A = {(a x · b} x) 2 + (a y · b y) 2} 1/2

  The correlation value generation unit 53 omits the product of the z component as in (Equation 4) and obtains the correlation value using the product of the zy component, so that the amount of calculation is larger than that in the case of using the product of the xyz component. Can be reduced.

(Example 3 of calculating the correlation value)
In the example shown in the above formula 1-4, based and one point (x _1, y _1, z ₁₎ of the antenna in the magnetic field components, and that point (x _1, y _1, z ₁₎ substrate near electromagnetic field in The correlation value is obtained. For example, the magnetic field component of the antenna at one point (x ₁ , y ₁ , z ₁ ), the point (x ₁ , y ₁ , z ₁ ), and the vicinity of the point Correlation values can also be obtained based on near-substrate electromagnetic fields at a plurality of points. For example, at three points (x ₂ , y ₂ , z ₂ ), (x ₃ , y ₃ , z ₄ ), (x ₄ , y ₄ , z ₄ ) around (x ₁ , y ₁ , z ₁ ) Assuming that the intensities of the near-field electromagnetic fields are c, d, and e, for example, the correlation value can be obtained by the following (formula 5). In the following (Formula 5), M is a constant.

(Formula 5)
A = M (a · b + a · c + a · d + a · e)

  The correlation value generation unit 53 obtains the correlation value A by using the near-field electromagnetic field strength at a plurality of points and the strength of the magnetic field component of the antenna at one point, as described above (Equation 5). The correlation value can be obtained in consideration of the interaction between the electromagnetic field near the substrate at the point and the magnetic field component of the antenna. In addition, the correlation value generation unit 53 may obtain the correlation value using, for example, the strength of the antenna magnetic field component at a plurality of points and the strength of the electromagnetic field near the substrate at one point, or the magnetic field component of the antenna. Alternatively, the correlation value may be obtained using data representing the substrate near electromagnetic field as a vector.

  Based on the calculation described above, the correlation value generation unit 53 obtains a correlation value in a region where the region measured by the antenna electromagnetic field distribution measurement unit 12 and the region measured by the board vicinity electromagnetic field distribution measurement unit 13 overlap. As a result, a distribution of correlation values in a region where unnecessary radiation noise occurs is obtained. For example, the distribution of correlation values in the plane portion can be obtained from the magnetic field distribution of the antenna measured in a certain plane and the near-field electromagnetic field distribution measured in the plane portion included in the plane. That is, the correlation value distribution can be obtained by combining two distribution diagrams of the electromagnetic radiation distribution near the substrate of unnecessary radiation noise and the magnetic field distribution of the antenna at the time of transmission / reception of the electronic device.

  FIG. 6C is an example of an image when the correlation value distribution indicated by the correlation value generation unit 53 is displayed on XY coordinates. In FIG. 6C, the area surrounded by the square f34 is an area where the substrate near-field electromagnetic field distribution and the antenna magnetic field distribution of the memory 34 overlap, and the area surrounded by the square f35 is the board 35 near-field electromagnetic field distribution and the antenna magnetic field. A region where the distribution overlaps and a region surrounded by the squares f36, 37 represent regions where the near-substrate electromagnetic field distribution and the antenna magnetic field distribution of the power sources 36, 37 overlap. In the squares f34, 35, 36, and 37, the board vicinity electromagnetic field magnetic field distribution is represented by a line connecting points having the same magnetic field component. The XYZ direction shown in FIG. 6C corresponds to the XYZ direction in the substrate 14a shown in FIG. The board | substrate 14a is located in the area | region of X = 0-X1, Y = 0-Y1.

  The calculation formula for obtaining the correlation value is not limited to the above example. For example, the calculation formula may be arbitrarily set for each mobile phone system based on whether a transmission / reception failure problem occurs.

  The comparison unit 54 compares the correlation value generated in step S17 with the determination threshold value (X) calculated in advance by another method and stored in the storage unit 18 (step S18). For example, when the correlation value A is smaller than the threshold value X (X> A), the comparison unit 54 determines that the transmission / reception failure of the electronic device due to unnecessary radiation noise does not occur, and when the correlation value A is greater than or equal to the threshold value X, It can be determined that an electronic device transmission / reception failure occurs due to unnecessary radiation noise.

  This comparison is preferably performed for all correlation values generated in step S17. In step S17, since a correlation value is obtained in a region where the region measured by the antenna electromagnetic field distribution measurement unit 12 and the region measured by the board vicinity electromagnetic field distribution measurement unit 13 overlap, that is, the noise generation region, By performing the above comparison process for the correlation value, it is possible to determine whether or not a transmission / reception failure has occurred for each noise generation region. A noise occurrence area determined to have a transmission / reception failure may be recognized as a transmission / reception failure occurrence location. The determination result is stored in the storage unit 18 as result data.

  In the example of the screen shown in FIG. 6C, the darkest portion 61 is a portion where it is determined that there is a transmission / reception failure due to unnecessary radiation noise in the comparison process (step S18). The designer designs the presence / absence of a transmission / reception failure and the location where the transmission / reception failure occurs by viewing the display of the result data of the prototype for the initial design stage as shown in FIGS. 6 (a) to 6 (c). It can be grasped at an early stage.

  Here, an example of a method for calculating the determination threshold (X) will be described. For example, for mobile phones using the W-CDMA system, specifications necessary for shipping to the market are standardized in 3GPP (3rd Generation Partnership Project). Among the standards, there is a reception sensitivity as a specification necessary for preventing a transmission / reception failure, and the value is defined as −117 dBm / 3.84 MHz. In other words, this means that reception must be possible whenever the input power is greater than −117 dBm / 3.84 MHz.

  In order for the mobile phone to achieve this reception sensitivity, it is necessary to reduce the amount of unnecessary radiation noise received by the antenna to a certain reference value or less. This is because unnecessary radiation noise is a factor that degrades the reception sensitivity characteristic.

  Unwanted radiation noise received by the antenna can be measured, for example, using the configuration shown in FIG. FIG. 5 is a diagram showing a configuration for measuring radio waves received by an antenna of a mobile phone. As shown in FIG. 5, the antenna 32 of the mobile phone 14 is provided with a switch 95 for switching the connection between the RF circuit block 33 and the external terminal 96, the measuring instrument 94 is connected to the external terminal 96, and the switch 95 is connected to the external terminal. By switching to the 96 side, the electromagnetic wave received by the antenna 32 can be measured. As the measuring instrument 94, for example, a spectrum analyzer, a vector single analyzer, or the like can be used.

  First, the cellular phone 14 does not perform antenna transmission / reception, and performs measurement in a state where a function other than the transmission / reception function such as a camera or an SD card (memory card) is operated, that is, only unnecessary radiation noise is emitted. By doing so, it is possible to measure unwanted radiation noise received by the antenna.

  When the unnecessary radiation noise intensity measured in this way is below the reference value, the antenna transmission / reception function is further operated under the same conditions as the measurement to measure the antenna magnetic field distribution and the near-field electromagnetic field distribution ( Steps S11 to S16), a correlation value distribution is calculated (step S17). The maximum value in the correlation value distribution obtained there can be used as the determination threshold.

  As described above, it is preferable to obtain the determination threshold (X) necessary for preventing a transmission / reception failure in consideration of the close relationship between the antenna characteristics and the amount of unnecessary radiation noise. The method for calculating the threshold value X is not limited to the above example. For example, an appropriate value may be set based on an empirical rule.

  After the comparison process (step S18 in FIG. 4), the board design data input unit 55 inputs board design data representing the structure of the board 14a from the CAD system 57 (step S19). The board design data includes, for example, design data representing the arrangement and wiring pattern of parts mounted on the board, the size and height of the parts, and the like.

  The guideline information generation unit 56 generates information serving as a guideline for designing the board 14a based on the result data of the comparison process in step S18 and the board design data input in step S19 (step S20). For example, the guideline information generation unit 56 compares the transmission / reception failure occurrence position included in the result data of the comparison process (step S18) with the position of the electronic component mounted on the board included in the board design data, The electronic component causing the transmission / reception failure can be identified. Furthermore, the guideline information generation unit 56 may generate information indicating the optimal mounting position of the component from past case data or the like in order to avoid a transmission / reception failure. In addition, when a plurality of electronic components cause a transmission / reception failure, the guideline information generation unit 56 determines the optimum mounting position or noise countermeasure component according to the priority order determined in advance for the plurality of electronic components. Information indicating the selection can be generated. Information generated by the guideline information generation unit 56 is stored in the storage unit 18 as design guideline data.

  The output unit 19 displays the result data of the comparison process (step S18) and the design guideline data generated by the design guideline data generation process (step S20) on a display or the like (step S21). As the result data of the comparison process, for example, the image shown in FIG.

  Further, the output unit 19 can also use the substrate design data input in the substrate design data input process (step S19) to display the correlation value distribution and the substrate structure so that they can be compared. Furthermore, the output unit 19 may display, as design guideline data, a mounted part on the board that causes a transmission / reception failure or a preferable design example for avoiding the transmission / reception failure. The guideline information generation unit 56 generates information indicating countermeasures from past cases as described above, for example, and the output unit 19 displays the information to obtain information that can be designed even by an inexperienced designer. be able to. By adding such an advisor function to the apparatus, a general-purpose and kind design support apparatus is provided.

  The designer can change the board design data to an appropriate design using the CAD system 57 based on the design guideline data output from the output unit 19. Further, the CAD system 57 can automatically read the design guideline data stored in the storage unit 18 and change the board design data based on the design guideline data.

  The CAD system 57 may be provided in the computer 15. In that case, the board design data generated by the CAD system 57 is also stored in the storage unit 18.

  In addition to the above information, the output unit 19 can display, for example, the measurement result of the antenna magnetic field distribution, the measurement result of the near-field electromagnetic field distribution, and the like. It is also possible to display two-dimensional and three-dimensional graphic data representing the shape of an electronic device such as a mobile phone.

  The operation of the design support apparatus 100 has been described above, but the order of the operation of the design support apparatus 100 is not limited to the order of the flowchart shown in FIG. For example, the board design data input process in step S19 may be performed before step S17.

  Further, the board design data input process (step S19) and the design guideline data generation process (step S20) can be omitted depending on the situation. Furthermore, by omitting the comparison process (step S18) and only displaying the distribution of the correlation values obtained in the correlation value generation process (step S17) on the output unit 19, the designer can view the display by Information about the influence of unnecessary noise on the magnetic field component of the antenna can be obtained. For example, the designer changes the design of the mobile phone to prevent noise, and the display of the correlation value distribution calculated by the measurement after the design change allows the effect of noise suppression to be achieved when the mobile phone terminal is actually used. Can be quantitatively grasped.

  According to the embodiment of the present invention, the correlation value is calculated by substituting the two parameters of the antenna magnetic field distribution and the near-field electromagnetic field distribution into an arbitrary calculation formula, and the correlation value is compared with the threshold value. It is possible to determine a causal relationship with a transmission / reception failure of an electronic device caused by unnecessary radiation noise generated from an electronic component. That is, it is possible to specify whether or not a transmission / reception failure has occurred due to unnecessary radiation noise and where it occurs. As a result, the problem part can be grasped in advance at the initial design stage of an electronic device such as a mobile phone and other wireless devices.

  Further, in the computer 15, the correlation value distribution is obtained by a combination calculation of the near-field electromagnetic field distribution of unwanted radiation noise generated from the electronic components of the printed circuit board of the electronic device and the antenna magnetic field distribution when the electronic device transmits and receives. Desired. With this correlation value distribution, it is possible to obtain the magnetic field distribution of the antenna in a state close to the time of actual use of the electronic device in consideration of the influence of unnecessary radiation noise. Based on the antenna magnetic field distribution in a state close to actual use, for example, main characteristics of the antenna such as antenna directivity, gain, and efficiency can be calculated.

  Further, the board vicinity electromagnetic field distribution measuring unit 13 measures the board near electromagnetic field distribution of unnecessary radiation noise for each electronic component provided on the board 14a, and the correlation value generating unit 53 is provided for each electronic component. The near-substrate electromagnetic field distribution at is overlapped with the antenna electromagnetic field distribution, and the correlation value of the overlapped portion is calculated. Therefore, a correlation value is calculated for a portion of the substrate 14a where there is a high possibility that unnecessary radiation noise is generated. Therefore, the amount of calculation is smaller than calculating the correlation value for the entire substrate 14a. In other words, for each electronic component, it is easy to specify whether or not a transmission / reception failure has occurred due to unnecessary radiation noise and where it occurs.

  Usually, as an evaluation method for an antenna used in a cellular phone, evaluation is performed when only the antenna is operated. However, when a display, camera, SD card (memory card), etc. are operating in a mobile phone, ICs such as a CPU, power supply, and memory operate. These ICs act as a source of unwanted radiation noise, so only the antenna operates. It is expected that the antenna characteristics will change greatly compared to the case where it is used. Therefore, by evaluating the antenna characteristics based on the magnetic field distribution of the antenna in a state close to actual use as described above, the antenna characteristic in a state close to the actual use state can be evaluated.

  Note that this embodiment is an example in which the electronic device to be designed is a mobile phone, but the present invention can also be applied to an electronic device having a wireless communication function other than the mobile phone. For example, the design support apparatus according to the present invention can be applied to the design of an electronic device having a wireless LAN function.

[Second Embodiment]
FIG. 7 is a functional block diagram showing the configuration of the design support apparatus according to the present embodiment. 7, parts similar to those of the design support apparatus 100 shown in FIG.

  A design support apparatus 103 shown in FIG. 7 includes an antenna magnetic field distribution analysis unit instead of the antenna electromagnetic field distribution measurement unit 12, the board vicinity electromagnetic field distribution measurement unit 13 and the control unit 59 shown in the design support apparatus 100 shown in FIG. 75 and a substrate vicinity electromagnetic field distribution analysis unit 76. That is, the antenna magnetic field distribution input by the antenna electromagnetic field distribution input unit 51 and the board near electromagnetic field distribution input by the board near electromagnetic field distribution input unit 52 are not data obtained as a result of measurement, but are obtained as a result of simulation. Data.

  As the antenna electromagnetic field distribution analysis unit 75 and the board vicinity electromagnetic field distribution analysis unit 76, for example, a commercially available electromagnetic field simulator, EMI simulator, self-made analysis program, or the like can be used. By obtaining the magnetic field distribution of the antenna and the electromagnetic field distribution in the vicinity of the substrate by simulation, it is not necessary to actually make a prototype and measure it, so these two distributions can be obtained relatively easily.

  In FIG. 7, the antenna electromagnetic field distribution analysis unit 75 and the board vicinity electromagnetic field distribution analysis unit 76 are provided in the computer 15, but these may be provided in an external PC or the like.

  Next, the operation of the design support apparatus 103 will be described with reference to the drawings. FIG. 10 is a flowchart showing the processing operation in the design support apparatus 103.

  First, the antenna electromagnetic field distribution analysis unit 75 and the board vicinity electromagnetic field distribution analysis unit 76 set analysis conditions (steps S31 and S32). Analysis conditions to be set include, for example, data representing the structure of an electronic device to be analyzed (for example, a mobile phone), and material constants of materials constituting the electronic device (for example, a material representing relative permittivity, relative permeability, and loss) Constants, etc.), excitation conditions in input / output, analysis region (range), boundary conditions for making the analysis region a closed space, and the like. Data representing the structure of the electronic device may be supplied from the CAD system 57, for example.

  Based on the set analysis conditions, the antenna electromagnetic field distribution analysis unit 75 analyzes the magnetic field distribution of the antenna around the electronic device to be analyzed by simulation (step S33). As the analysis result, for example, data representing the antenna magnetic field distribution in the plane near the electronic device to be analyzed is obtained.

  The board vicinity electromagnetic field distribution analysis unit 76 analyzes the board vicinity electromagnetic field distribution around the electronic component provided on the board of the electronic device to be analyzed based on the set analysis condition (step S34). As the analysis result, for example, data representing the near-substrate electromagnetic field distribution in the near plane of the electronic component to be analyzed is obtained.

  The antenna electromagnetic field distribution input unit 51 stores the analysis result of the antenna magnetic field distribution analysis (step S33) in the storage unit 18 (step S15).

  The board vicinity electromagnetic field distribution input unit 52 stores the analysis result of the board vicinity electromagnetic field distribution analysis (step S34) in the storage unit 18 (step S16).

  Since the process after step S15 and step S16 is the same as the process (refer FIG. 4) of the design assistance apparatus 100 in Embodiment 1, description is abbreviate | omitted.

[Third Embodiment]
FIG. 9 is a functional block diagram showing the configuration of the design support apparatus according to the present embodiment. 9, parts similar to those of the design support apparatus 100 shown in FIG. 1 are denoted by the same reference numerals, and description thereof is omitted.

  As shown in FIG. 9, in the design support apparatus 104 according to the present embodiment, the interface unit 16a includes a user interface 69, an antenna data input unit 61, an antenna electromagnetic field distribution storage unit 63, an antenna electromagnetic field distribution selection unit 62, and an antenna. Electromagnetic field distribution input unit 51a, antenna electromagnetic field distribution analysis unit 75a, component data input unit 64, component noise storage unit 66, noise data generation unit 65, wiring pattern generation unit 67, wiring noise data generation unit 68, and near-field electromagnetic field A distribution input unit 52a is provided. The configuration and operation of the calculation unit 17 and the output unit 19 are the same as the configuration and operation of the design support apparatus 100 shown in FIG.

  The user interface 69 is composed of an input device such as a keyboard and a mouse, for example. The antenna data input unit 61 inputs data relating to the antenna in the electronic device to be analyzed from the designer via the user interface 69. The antenna data is data representing at least one of characteristics, types, identifiers, structures, electronic devices on which the antenna is mounted, and the like of the antennas included in the electronic devices.

  The antenna electromagnetic field distribution storage unit 63 stores in advance antenna electromagnetic field distribution data for a plurality of antennas. The antenna electromagnetic field distribution data stored in advance is, for example, data representing the antenna magnetic field distribution measured in the past or the antenna magnetic field distribution generated by simulation.

  The antenna electromagnetic field distribution selection unit 62 reads appropriate antenna electromagnetic field distribution data from the antenna electromagnetic field distribution storage unit 63 based on the antenna antenna data input by the antenna data input unit 61, and the antenna electromagnetic field distribution input unit. 51a is passed as antenna electromagnetic field distribution data. The antenna electromagnetic field distribution input unit 51 a stores the antenna electromagnetic field distribution data in the storage unit 18 so that the calculation unit 17 can access it.

  The component data input unit 64 inputs component data representing the arrangement of electronic components provided on the circuit board of the electronic device to be analyzed. The component data input unit 64, for example, data representing the arrangement of components input from the designer via the user interface 69 is received as component data.

  The component noise storage unit 66 stores data representing unnecessary radiation noise generated from the electronic components for a plurality of electronic components. The noise data generation unit 65 selects and reads data regarding the electronic component represented by the component data input by the component data input unit 64 from the data regarding the plurality of electronic components. The noise data generation unit 65 generates board vicinity electromagnetic field distribution data based on the read data and the component data, and passes it to the board vicinity electromagnetic field distribution input unit 52a.

  The wiring pattern generation unit 67 generates wiring data indicating a wiring pattern connected to the electronic component indicated by the component data based on the component data input by the component data input unit 64. Based on the wiring data generated by the wiring pattern generation unit 67, the wiring noise data generation unit 68 generates data representing the distribution of the electric field component and / or the magnetic field component of the near electromagnetic field due to unnecessary radiation noise generated from the wiring. To do. The generated data is passed to the board vicinity electromagnetic field distribution input unit 52a as board vicinity electromagnetic field distribution data. The board vicinity electromagnetic field distribution input unit 52a stores the board vicinity electromagnetic field distribution data in the storage unit 18 so that the calculation unit 17 can access it.

  Next, the operation of the design support apparatus 104 will be described with reference to the drawings. FIG. 10 is a flowchart showing the processing operation in the design support apparatus 104. In the step shown in FIG. 10, the same step as the step shown in FIG.

  In FIG. 10, first, the interface unit 16a generates antenna magnetic field distribution data (step S150). Details of the process for generating the antenna magnetic field distribution data will be described later. The antenna electromagnetic field distribution input unit 51a stores the antenna magnetic field distribution data generated in step S150 in the storage unit 18 (step S15). Further, the interface unit 16a generates near-substrate electromagnetic field distribution data (step S160). Details of processing for generating near-substrate electromagnetic field distribution data will be described later. The board vicinity electromagnetic field distribution input unit 52a stores the board vicinity electromagnetic field distribution data generated in step S160 in the storage unit 18.

  The subsequent steps S17 to S21 are the same as the steps S17 to S21 shown in FIG.

  Here, details of the process of generating the antenna magnetic field distribution data (step S150) will be described with reference to FIG. First, the antenna data input unit 61 receives input of antenna data from the designer via the user interface 69 (step S1501). As antenna data, antenna data includes the frequency of electromagnetic waves transmitted and received by the antenna to be analyzed by the designer, the type of mobile phone on which the antenna is mounted, the antenna type, and an identifier for specifying the antenna to be analyzed. Is done.

  The antenna electromagnetic field distribution selection unit 62 refers to the antenna electromagnetic field distribution data of the plurality of antennas stored in the antenna electromagnetic field distribution storage unit 63 using the antenna data input in step S1501, and inputs the antenna data The antenna electromagnetic field distribution data of the antenna corresponding to is extracted (step S1502). Note that an ID is preferably assigned to each of the plurality of antenna electromagnetic field distribution data stored in the antenna electromagnetic field distribution storage unit 63.

  FIG. 12 is an example of data associated with the antenna magnetic field distribution data stored in the antenna electromagnetic field distribution storage unit 63. In the example shown in FIG. 12, the type indicated by each antenna magnetic field distribution data, the type of mobile phone, the frequency, and the antenna to be used are stored in association with each other. In this way, if the data related to the antenna magnetic field distribution data is associated with each ID, it is easy to search for the ID of the antenna magnetic field distribution data corresponding to the antenna data indicating the antenna to be analyzed.

The types of mobile phones in FIG. 12 are, for example, W-CDMA (Wideband-Code Division Multiple Access) or GSM (Global).
System type such as System for Mobile Communications), model name, and the like.

  For example, in the antenna data input by the antenna data input unit 61, the type of the mobile phone on which the antenna to be analyzed is mounted is W-CDMA, and the frequency band of the transmitted / received radio wave of the mobile phone is 700 MHz to 800 MHz. When the antenna type indicates that the type is A, the antenna electromagnetic field distribution selection unit 62 converts the antenna electromagnetic field distribution data of ID = 1 satisfying these conditions in the data shown in FIG. Extracted from the field distribution storage unit 63.

  Note that there may be a plurality of antenna electromagnetic field distribution data indicated by the antenna data input by the antenna data input unit 61. For example, when a plurality of antennas are mounted on a mobile phone to be analyzed, antenna data indicating the plurality of antennas is input by the antenna data input unit 61. In that case, the antenna electromagnetic field distribution selection unit 62 extracts the antenna electromagnetic field distribution data for the plurality of antennas from the antenna electromagnetic field distribution storage unit 63.

  Further, the designer can specify, for example, an ID for identifying the antenna electromagnetic field distribution data of the antenna to be analyzed as the input antenna data by the antenna data input unit 61. In this case, the antenna electromagnetic field distribution selection unit 62 extracts the antenna electromagnetic field distribution data of the designated ID from the antenna electromagnetic field distribution storage unit 63.

  As described above, when the antenna electromagnetic field distribution data corresponding to the antenna indicated by the antenna data is present in the antenna electromagnetic field distribution storage unit 63 (Yes in step 1503), the antenna electromagnetic field distribution selection unit 62 displays the corresponding antenna electromagnetic field. Distribution data is acquired (step S1504), and the acquired data is passed to the antenna electromagnetic field distribution input unit (step S1506).

  If the antenna electromagnetic field distribution data corresponding to the antenna indicated by the antenna data does not exist in the antenna electromagnetic field distribution storage unit 63 (No in step S1503), the antenna electromagnetic field analysis unit 75a performs electromagnetic simulation of the antenna by simulation. Data indicating the field distribution is generated (step S1505). The generated data is passed to the antenna electromagnetic field distribution input unit (step S1506).

  By the process shown in FIG. 11, antenna electromagnetic field data indicating the electromagnetic field distribution of the antenna indicated by the antenna data is input to the design support apparatus 104 by the antenna electromagnetic field distribution input unit 51a.

  Next, details of the process of generating the near-field electromagnetic field distribution data (step S160) will be described with reference to FIG. First, the component data input unit 64 inputs the analysis target frequency f designated by the designer via the user interface 69 (step S1601). Further, the component data input unit 64 inputs component data representing the arrangement of electronic components provided on the circuit board of the mobile phone to be analyzed from, for example, the CAD system 57 (step S1602).

  In the CAD system 57, for example, design data of a mobile phone designed by a designer is stored in advance. Since the design data includes data representing the arrangement of electronic components provided on the circuit board of the mobile phone, the design data is read by the component data input unit 64 as component data. The component data includes, for example, data indicating the position, size, arrangement direction, type, model number, terminal position, and the like of the electronic component. The part data input unit 64 may accept part data from the designer via the user interface 69 instead of reading design data of the CAD system 57.

  FIG. 14A is a diagram illustrating an example of the arrangement of electronic components in a mobile phone. FIG. 14A shows the positions of the components 71a and 71b with respect to the casing 73 of the mobile phone. In practice, the components 71a and 71b are provided on a circuit board in the housing.

  The noise data generation unit 65 refers to the component noise storage unit 66 based on the component data input by the component data input unit 64, and acquires data representing unnecessary radiation noise generated from the component indicated by the component data (FIG. 13). Step S1603). Since the component noise storage unit 66 stores data representing unnecessary radiation noise generated from components for a plurality of components, the noise data generation unit 65 selects component data from the component noise storage unit 66 data. Extract data for parts corresponding to.

  Data representing unnecessary radiation noise is data representing an electromagnetic field of unnecessary radiation noise generated from a component. The data representing the unwanted radiation noise is data representing the distribution of the magnetic field component of the electromagnetic field at a position spaced apart from the component, for example. The data representing the unwanted radiation noise includes, for example, data indicating the position and data indicating the magnitude of the magnetic field component or electric field component of the electromagnetic field at the position. The data representing the unwanted radiation noise for each part may be data obtained by measurement or simulation in advance for each part, or may be data provided by a manufacturer that manufactures the part.

  Here, an example in which data representing unnecessary radiation noise of a component is obtained by measurement will be described with reference to FIG. For example, as shown in FIG. 15, the near-field electromagnetic field distribution measuring unit 13 measures the electromagnetic field distribution around the single component 71 mounted on the evaluation board 77 under the control of the computer 15. Thereby, the unnecessary radiation noise which generate | occur | produces in the state which the components 71 operate | move alone is measured. The measurement result is stored in the computer 15 as data representing unnecessary radiation noise of the component 71. The substrate vicinity electromagnetic field distribution measurement unit 13 and the computer 15 shown in FIG. 15 can be the same as the substrate vicinity electromagnetic field distribution measurement unit 13 and the computer 15 shown in FIG.

  By performing the measurement for such individual components for each of various types of components, data representing unnecessary radiation noise of various components can be obtained. The component noise storage unit 66 stores a plurality of data representing unnecessary radiation noise for a plurality of components obtained in this way. Each of the plurality of data is assigned an ID for identifying which component is the unwanted radiation noise. The ID is stored in association with, for example, data indicating the type of component, manufacturer, frequency, and the like.

  FIG. 16 is an example of a data table associated with an ID. In the example shown in FIG. 16, data representing the type of component, frequency, manufacturer of the manufacturer, and product number is stored in association with the ID of the data representing each unnecessary radiation noise.

  The noise data generation unit 65 can specify an ID of data representing unnecessary radiation noise of a component corresponding to the component data input by the component data input unit 64 by referring to a table as shown in FIG. For example, as in the table shown in FIG. 16, IDs of data representing unnecessary radiation noise of individual electronic components are stored in association with data representing types of components such as CPU, power supply, and memory, that is, functions of the components. This makes it easy to extract unnecessary radiation noise data corresponding to the type of electronic component to be analyzed as necessary.

  In addition, the component noise storage unit 66 stores, for example, data representing unnecessary radiation noise for components used in the past, so that past data can be used effectively. As a result, with respect to the arrangement of electronic components having various patterns, it is possible to determine the presence or absence of noise problems and superiority or inferiority without repeating trial manufacture.

  The wiring pattern generation unit 67 generates wiring data indicating a wiring pattern between components based on the component data input in step S1602 (step S1604). The wiring data is, for example, data indicating the position of the wiring. For example, the wiring pattern generation unit 67 may automatically calculate the shortest line connecting the component terminals indicated by the component data to generate the wiring data, or input from the designer via the user interface 69. The wiring data may be generated using data indicating the wiring pattern thus formed.

  FIG. 14B is a diagram illustrating an example of a wiring pattern between components. In the example shown in FIG. 14B, the component 71 a and the component 71 b are connected by the wiring 72.

  The wiring noise data generating unit 68 acquires a time series waveform of a signal passing through the wiring represented by the wiring data generated in step S1604 (step S1605). Data indicating a time-series waveform of a signal output from a component is stored in advance in, for example, a component noise storage unit. The wiring noise data generation unit 68 acquires data indicating the time series waveform. Data indicating a time series waveform is obtained, for example, by measuring a time series waveform of a signal output from each terminal by applying a probe connected to an oscilloscope to each terminal of the component. In addition, data indicating the period, frequency, rise time, etc. of the signal output from each terminal of a component may be provided by a component manufacturer as component specification information. It can also be used as data indicating a time-series waveform of a signal.

  The wiring noise data generation unit 68 calculates the intensity of noise generated from the wiring based on the time-series waveform of the signal passing through the wiring (step S1606). For example, the wiring noise data generation unit 68 obtains a spectrum of a signal passing through the wiring by performing a fast Fourier transform on the time series waveform, and calculates a frequency change in the intensity of noise generated from the wiring from the spectrum. Can be sought. The wiring noise data generation unit 68 can calculate the noise intensity at the analysis target frequency f from the frequency change of the noise intensity.

  The method for obtaining the magnitude of noise generated from the wiring is not limited to the method using the fast Fourier transform described above. For example, an electromagnetic field generated by a signal flowing through the wiring can be calculated by simulation.

  FIG. 17 is a graph showing a frequency change in the intensity of noise generated from the wiring. In the graph shown in FIG. 17, the horizontal axis represents frequency and the vertical axis represents noise intensity. From this graph, the noise intensity Nf at the analysis target frequency f is obtained.

  The wiring noise data generation unit 68 generates data representing the distribution of noise intensity due to wiring, that is, data representing unnecessary radiation noise generated from the wiring, based on the intensity of noise generated from the wiring and the data indicating the position of the wiring. .

  The data representing the unwanted radiation noise of the part obtained in step S1603 and the data representing the unwanted radiation noise of the wiring obtained in step S1606 are passed to the board vicinity electromagnetic field distribution input unit 52a. The board vicinity electromagnetic field distribution input unit 52a stores these data in the storage unit 18 as board vicinity electromagnetic field distribution data (step S1607).

  With the processing shown in FIG. 13, data representing the near-board electromagnetic field distribution of unnecessary radiation noise generated from the electronic component and wiring connected to the electronic component is generated from the data representing the arrangement of the electronic component of the mobile phone. .

  As described above, in the design support apparatus 104 according to the present embodiment, the data indicating the antenna magnetic field distribution is stored in the antenna electromagnetic field distribution storage unit 63 and the data indicating the unnecessary radiation noise generated from the component is stored in the component noise storage unit 66. This is a configuration stored in advance. Therefore, by using these data for the interface 16a, it is possible to determine the presence / absence and superiority of noise problems without making a prototype at the stage when the antenna configuration of the mobile phone, the arrangement of parts, etc. are determined. become.

[Fourth Embodiment]
FIG. 18 is a flowchart showing the operation of the design support apparatus in this embodiment. The configuration of the design support apparatus in the present embodiment is the same as that of the design support apparatus shown in FIG. The process shown in FIG. 18 is an example of a process in the case where data representing the structure of a plurality of mobile phones having different component arrangements is created in the CAD system 57, and each mobile phone is analyzed.

  First, the interface unit 16a generates antenna magnetic field distribution data for the first mobile phone (step S150). The process for generating the antenna magnetic field distribution data is the same as the process shown in FIG. The antenna electromagnetic field distribution input unit 51a stores the antenna magnetic field distribution data generated in step S150 in the storage unit 18 (step S15). Further, the interface unit 16a generates near-substrate electromagnetic field distribution data for the first mobile phone (step S160). The process for generating the near-field electromagnetic field distribution data is the same as the process shown in FIG. The board vicinity electromagnetic field distribution input unit 52a stores the board vicinity electromagnetic field distribution data generated in step S160 in the storage unit 18.

  The computing unit 17 reads the antenna magnetic field distribution data and the board near electromagnetic field distribution data stored in the storage unit 18 and generates correlation value distribution data (step S17). The correlation value distribution data generation process can be performed by the same process as the correlation value generation process (step S17 in FIG. 1) by the correlation value generation unit 53 in the first embodiment.

  The correlation value distribution data is data representing the distribution of correlation values in the overlapping area of the area indicated by the antenna magnetic field distribution data and the area indicated by the fabric boundary distribution data in the vicinity of the substrate, that is, in the unwanted radiation noise generation area. The correlation value distribution data is expressed, for example, as a set of correlation values at each of a plurality of points in the unwanted radiation noise generation region.

  The computing unit 17 calculates an evaluation value using the correlation value distribution data (step S17a). For example, the calculation unit 17 generates a maximum value as an evaluation value from a set of correlation values represented by correlation value distribution data. In this case, the evaluation value indicates a correlation value at a point where the degree of influence of the near-substrate electromagnetic field on the magnetic field component of the antenna is the largest.

  The evaluation value is not limited to the maximum value. For example, it may be a minimum value of a set of correlation values, an average value of correlation values, a sum of correlation values, a product of correlation values, or the like.

  When an evaluation value is generated for the data representing the structure of the first mobile phone by the process of step S17a, the design support apparatus 103 causes the CAD system 57 to analyze the mobile phone (second mobile phone). It is determined whether or not there is data representing the structure of (step S17b). If it is determined that there is data to be analyzed, antenna electromagnetic field distribution data generation processing (step S150) and board near electromagnetic field distribution data generation processing (step S160) are performed for the second mobile phone based on the data. Executed. Thereafter, the processes of steps S15, S16, S17, and S17a are repeated for the first mobile phone.

  In this way, evaluation values are sequentially generated for data representing the structures of a plurality of mobile phones having different component arrangements created by the CAD system 57. The output unit 19 may display the evaluation values on a display or the like so that they can be compared (step S21). The designer can compare the evaluation values of the data representing the structures of the plurality of mobile phones created by the CAD system 57 by looking at the display by the output unit 19.

  FIG. 19A is a diagram showing an example of component arrangement in a mobile phone. FIG. 19B is a diagram showing an example of component arrangement different from that in FIG. The position of the component 71a shown in FIG. 19A with respect to the housing 73 is the same as the position of the component 71a shown in FIG. 19B with respect to the housing 73, but the housing of the component 71b shown in FIG. The position with respect to 73 and the position with respect to the housing | casing 73 of the component 71b shown in FIG.19 (b) differ. As described above, when the components are arranged differently, the near electromagnetic field distribution of the unnecessary radiation noise generated from the components 71a and 71b and the wiring 72 is also different. Therefore, the influence of unwanted radiation noise on the function of transmitting and receiving electromagnetic waves via the antenna is also different. The degree of the influence is reflected in the evaluation value generated in step S17a of the process shown in FIG. Therefore, the design support apparatus can arrange the presence or absence of noise problems in parts and wiring, the location where noise problems occur, the superiority or inferiority of the influence of noise, etc., in the initial stage of designing a mobile phone by the process shown in FIG. Can be judged.

  FIG. 20A is a graph showing measured values of the magnitude of noise included in signals transmitted and received by the antenna of the mobile phone when the mobile phone having the component arrangement shown in FIG. 19A is prototyped. . FIG. 20B is a graph showing measured values of the magnitude of noise included in the signal transmitted and received by the antenna of the mobile phone when the mobile phone having the component arrangement shown in FIG. . As shown in FIGS. 20A and 20B, the magnitude of noise included in the transmission / reception signal of the antenna varies depending on the difference in the component arrangement. Such an actual measurement value of noise and the correlation value generated in step S17 in FIG. 18 can be stored in association with each other. For example, the output unit 19 may display the noise actual measurement value and the correlation value on a display or the like so as to enable comparison. Such a display helps the designer to estimate the occurrence of a noise problem from the correlation value.

[Fifth Embodiment]
The present embodiment is an embodiment in the case where the design support apparatus in the third and fourth embodiments is applied to the design of a mobile phone having a substrate with a more complicated configuration. The configuration of the design support apparatus of the present embodiment can be made the same as that of the third or fourth embodiment, and the description thereof is omitted.

  FIG. 21 is a cross-sectional view in the YZ plane of a mobile phone to be analyzed by the design support apparatus in the present embodiment. A mobile phone 80 shown in FIG. 21 includes a housing 81, an antenna 87, and a main board 82 and a sub board 84 provided in the housing 81. Components 85a, 85b, and 85c are provided on the upper surface of the main board 82, and components 85f, 85d, and 85e are provided on the lower surface. A sub board 84 is provided below the main board 82 via a connector 86. A component 85h is provided on the upper surface of the sub-board, and a component 85g is provided on the lower surface.

  The operation of the design support apparatus in this embodiment is the same as the operation shown in FIG. Details of the near-field electromagnetic field data generation (step S160) during the processing shown in FIG. 10 are shown in FIG. In the part data input (step S1602) of the process shown in FIG. 13, the part data input unit 64 in the present embodiment inputs data representing the arrangement of parts shown in FIG. 21 as part data.

  In the next step S1604, the noise data generation unit 65 in the present embodiment acquires data representing unnecessary radiation noise of each of the components 85a to 85h illustrated in FIG. 21 from the component noise storage unit 66. At this time, the acquired data indicating the unnecessary radiation noise of each of the components 85a to 85h is, for example, data indicating the distribution of the magnetic field component of the near electromagnetic field in a plane separated from the component by a predetermined distance. The noise data generation unit 65 synthesizes the magnetic field component distribution of the near electromagnetic field for the plurality of components 85a to 85h, and obtains the distribution on the XY plane 88 that is separated from the main board 82 by a certain distance, for example. The noise data generation unit 65 preferably converts data representing the unnecessary radiation noise of the components 85 a to 85 h into data representing the magnetic field component of the near electromagnetic field on the XY plane 88.

  For example, if the data acquired from the component noise storage unit 66 for the component 85g is data representing the distribution of the near electromagnetic field in the plane 88a separated by m1 from the component 85g, the noise data generation unit 65 uses this data as the component 85g. The data is converted into data representing the distribution of the near electromagnetic field in a plane separated from m by 85 g. Thereby, the data representing the unnecessary radiation noise of the component 85g becomes data representing the distribution of the electromagnetic field in the XY plane 88.

Usually, the intensity of noise radiated from a component varies depending on the distance r from the component. For example, the intensity of the noise radiated from the component 85g, when the distance from the component 85g and r, at close to the part 85g is proportional to 1 / r ^3, beyond a certain distance 1 / r ^2, are more It is known that exceeding the distance is proportional to 1 / r. By taking into account the difference between the distances m1 and m2 using such a relationship, the noise intensity acquired from the component noise storage unit 66 can be converted into the noise intensity on the XY plane 88.

  Further, for example, when there are parts overlapping in the Z direction, such as the parts 85c and 85g, the noise data generation unit 65 adds the intensity of unnecessary radiation noise to the part where the parts 85c and 85g overlap. The combined value can be used as the intensity of the unwanted radiation noise in that portion.

  In this way, the noise data generation unit 65 can generate data representing the distribution of the magnetic field component of the electromagnetic field on the XY plane 88 of unnecessary radiation noise generated from the components 85a to 85h. The generated data is used in the subsequent processing as board near electromagnetic field distribution data due to unnecessary radiation noise of the components 85a to 85h.

  The embodiment in which the design support apparatus is applied to the design of a mobile phone having a substrate having a complicated configuration has been described by taking the mobile phone having the structure shown in FIG. 21 as an example, but the mobile phone to which the design support apparatus is applied. The structure is not limited to the structure shown in FIG. The design support apparatus can also be applied to other electronic devices having a structure in which a plurality of boards are connected or a structure in which components are mounted on both sides of the board.

  As described above, according to the first to fifth embodiments, the value calculated from the two distributions of the antenna magnetic field distribution and the near-field electromagnetic field distribution is compared with a determination threshold necessary for preventing transmission / reception failure. As a result, it is possible to easily grasp the influence on the transmission / reception characteristics due to unnecessary radiation noise caused by electronic components such as semiconductor ICs mounted on the circuit board and wiring patterns routed between the electronic components. it can. Furthermore, it is possible to quantitatively grasp the effects of noise countermeasures while assuming actual use of the mobile phone terminal. In the design process of the mobile phone terminal, the design support apparatus can perform the processing of the flowchart shown in FIG. 4, 8, 10 or 17, so that the development period can be shortened and the development investment can be reduced.

  In addition, the design support apparatus in Embodiment 1-5 can also be utilized as an electromagnetic wave analysis apparatus.

  An electromagnetic wave analysis apparatus and an electromagnetic wave analysis program according to the present invention are capable of obtaining information on an influence of an arrangement of components or wiring provided on a circuit board of an electronic device on a transmission / reception function via an antenna of the electronic device. Since it can be used as a device and an electromagnetic wave analysis program, it is useful for the efficient development of electronic devices.

Functional block representing the configuration of the design support apparatus according to the first embodiment (A) is the functional block diagram showing the structure of the design support apparatus containing the detailed structure of the measurement part concerning 1st Embodiment, and the schematic of a board | substrate. (B) is a schematic diagram of the entire mobile phone including a housing. Functional block diagram showing another configuration of the measurement unit The flowchart which shows operation | movement of the design support apparatus concerning 1st Embodiment. The figure which shows the structure for measuring the electric wave which the antenna of the cellular phone receives (A) is an example of the image which displayed the magnetic field distribution of the antenna on XY coordinate. (B) is an example of the image which displayed the board | substrate near electromagnetic field magnetic field distribution of unnecessary radiation noise on XY coordinate. (C) is an example of an image in which the distribution of correlation values is displayed on XY coordinates. Functional block diagram showing the configuration of the design support apparatus in the second embodiment The flowchart which shows operation | movement of the design support apparatus concerning 2nd Embodiment. Functional block diagram showing the configuration of the design support apparatus in the third embodiment The flowchart which shows operation | movement of the design support apparatus concerning 3rd Embodiment. , A flowchart showing processing for generating antenna magnetic field distribution data Example of data associated with antenna magnetic field distribution data Flowchart showing processing for generating near-field electromagnetic field distribution data (A) is a figure which shows the example of arrangement | positioning of the electronic component in a mobile telephone. (B) is a figure which shows the example of the wiring pattern between components. It is a figure which shows the structure of the apparatus which measures the unnecessary radiation noise of the components mounted in the evaluation board | substrate. Example of data table associated with data representing unwanted radiation noise Graph showing frequency change of noise intensity generated from wiring The flowchart which shows operation | movement of the design assistance apparatus in 4th Embodiment. (A) is a figure which shows an example of component arrangement | positioning in a mobile telephone. (B) is a figure which shows the example of component arrangement | positioning different from (a). (A) is a graph which shows the measured value of the magnitude | size of the noise in a mobile telephone with the components arrangement | positioning shown to Fig.19 (a). (B) is a graph which shows the measured value of the magnitude | size of the noise in a mobile telephone with the components arrangement | positioning shown in FIG.19 (b). Sectional drawing in YZ plane of the mobile telephone used as the analysis object of the design support apparatus in 5th Embodiment

Explanation of symbols

12 Antenna Electromagnetic Field Distribution Measurement Unit 12a Measuring instrument (for antenna magnetic field component)
13 Substrate Near Electromagnetic Field Distribution Measurement Unit 13a Measuring Device
DESCRIPTION OF SYMBOLS 14 Mobile phone 14a Board | substrate 15 Calculator 16, 16a Interface part 17 Calculation part 18 Memory | storage part 19 Output part 21 Measuring part 21a Measuring instrument 21b Detector 22a, 22b IC
23 Power supply terminal 24 Clock terminal 25a, 25b, 25c Signal terminal 26 Ground terminal 27a, 27b, 27c Signal terminal 28a, 28b, 28c Wiring 29 Magnetic field distribution of antenna 30 Exceeds predetermined threshold in magnetic field distribution of antenna Part 31 frequency spectrum 32, 87 antenna 33 RF circuit block 34 memory 35 CPU
36, 37 Power supply 38 Wiring 40a Substrate vicinity electromagnetic field distribution measurement surface 40b Antenna magnetic field distribution measurement surface 42 Pointer information generation unit 44 Determination unit 45 Extraction unit 46 Frequency input unit 47 Position input unit 51, 51a Antenna electromagnetic field distribution input unit 52, 52a Substrate Near Electromagnetic Field Distribution Input Unit 53 Correlation Value Generation Unit 54 Comparison Unit 55 Substrate Design Data Input Unit 56 Pointer Information Generation Unit 57 CAD System 58 Modification Unit 59 Control Unit 61 Antenna Data Input Unit 63 Antenna Electromagnetic Field Distribution Storage Unit 62 Antenna Electromagnetic field distribution selection unit 64 Component data input unit 66 Component noise storage unit 65 Noise data generation unit 67 Wiring pattern generation unit 68 Wiring noise data generation unit 69 User interface 71, 71a, 71b Component 72 Wiring 73, 81 Housing 75, 75a Antenna Electromagnetic Field Distribution Analysis Unit 76 Substrate vicinity electromagnetic field distribution analysis unit 77 Evaluation board 80 Mobile phone 85a, 85b, 85c, 85d, 85e, 85f, 85g, 85h Parts 86 Connector 88 XY plane 94 Measuring instrument 95 Switch 96 External terminal 100, 103, 104 Design support device

Claims (18)

An electromagnetic wave analysis device for examining the influence of unwanted radiation noise generated from a circuit board of an electronic device that transmits and receives electromagnetic waves via an antenna on electromagnetic waves that are transmitted and received via the antenna,
An antenna electromagnetic field distribution input unit for inputting antenna electromagnetic field distribution data representing a distribution of an electromagnetic field of the antenna that is a magnetic field component or an electric field component of electromagnetic waves transmitted and received via the antenna;
A near-field electromagnetic field distribution input unit for inputting near-field electromagnetic field distribution data representing a distribution of an electric field component or a magnetic field component of a near electromagnetic field due to unnecessary radiation noise generated from electronic components provided on the circuit board, or both;
An electromagnetic wave comprising a correlation value generation unit that generates a distribution of correlation values representing the correlation between the electromagnetic field of the antenna and the electromagnetic field in the vicinity of the substrate, based on the antenna electromagnetic field distribution data and the near-field electromagnetic field distribution data. Analysis device.   The near-field electromagnetic field distribution input unit is data representing the electric field component or magnetic field component of the near electromagnetic field due to unnecessary radiation noise generated from the wiring connecting the electronic components provided on the circuit board, or both, The electromagnetic wave analysis apparatus according to claim 1, further input as the substrate vicinity electromagnetic field distribution data.   The electromagnetic wave analysis according to claim 1, further comprising: a comparison unit that determines whether or not there is an electromagnetic wave transmission / reception failure in the electronic device by comparing each correlation value in the correlation value distribution with a predetermined threshold value. apparatus.   The electromagnetic wave analysis apparatus according to claim 1, wherein the correlation value includes a product of an electromagnetic field value of the antenna and a near-field electromagnetic field value.   The electromagnetic wave analysis device according to claim 1, wherein the correlation value generation unit further generates a maximum value, a minimum value, or both of the correlation values as an evaluation value. The antenna electromagnetic field distribution data and the board vicinity electromagnetic field distribution data are data represented by vectors in respective coordinates,
The correlation value generation unit calculates a correlation value by using a product of at least one component of the vector of the antenna electromagnetic field distribution data at coordinates corresponding to each other and the component of the vector of the near-field electromagnetic field distribution data. The electromagnetic wave analysis apparatus according to claim 1, wherein the correlation value distribution is generated.   The distribution of the electromagnetic field of the antenna that is the magnetic field component or electric field component of the electromagnetic wave transmitted and received through the antenna is obtained by measuring the electromagnetic field around the electronic device, and the antenna electromagnetic field is input to the antenna electromagnetic field distribution input unit. The electromagnetic wave analysis device according to claim 1, further comprising an antenna electromagnetic field distribution measurement unit that is passed as distribution data.   The distribution of both the electric field component and / or the magnetic field component of the nearby electromagnetic field due to unwanted radiation noise radiated from the electronic component provided on the circuit board of the electronic device by the operation of the electronic device is determined as the electromagnetic field around the electronic component. The electromagnetic wave analysis apparatus according to claim 1, further comprising: a board near electromagnetic field distribution measurement unit that is obtained by measuring and passed as board near electromagnetic field distribution data to the board near electromagnetic field distribution input unit.   The distribution of the electromagnetic field of the antenna, which is the magnetic field component or the electric field component of the electromagnetic wave transmitted and received via the antenna, is obtained by simulation analyzing the electromagnetic field around the electronic device, and the antenna electromagnetic field is input to the antenna electromagnetic field distribution input unit. The electromagnetic wave analysis device according to claim 1, further comprising an antenna electromagnetic field distribution analysis unit to be passed as distribution data.   The distribution of both the electric field component and / or the magnetic field component of the nearby electromagnetic field due to unwanted radiation noise radiated from the electronic component provided on the circuit board of the electronic device by the operation of the electronic device is determined as the electromagnetic field around the electronic component. The electromagnetic wave analysis apparatus according to claim 1, further comprising: a board near electromagnetic field distribution analysis unit that is obtained by a simulation that analyzes and passes the board near electromagnetic field distribution input unit as board near electromagnetic field distribution data. A component noise storage unit that stores data representing unnecessary radiation noise generated from electronic components for a plurality of electronic components;
A component data input unit for inputting component data representing an arrangement of electronic components provided on a circuit board of the electronic device;
Data representing unnecessary radiation noise generated from the electronic component represented by the component data is read from the component noise storage unit, and the near-field electromagnetic field distribution data is generated using the read data and the component data. The electromagnetic wave analysis device according to claim 1, further comprising: a noise data generation unit that passes to the substrate vicinity electromagnetic field distribution input unit. Based on the component data, a wiring pattern generation unit that generates wiring data indicating a wiring pattern connected to an electronic component provided on the circuit board;
Based on the wiring data, data representing the distribution of the electric field component and / or magnetic field component of the near electromagnetic field due to unnecessary radiation noise generated from the wiring is generated, and the generated data is used as the substrate near electromagnetic field distribution data. The electromagnetic wave analysis device according to claim 11, further comprising: a wiring noise data generation unit that is passed to the substrate vicinity electromagnetic field distribution input unit. An antenna electromagnetic field distribution storage unit for storing the antenna electromagnetic field distribution data for a plurality of antennas;
An antenna data input unit for inputting data relating to an antenna in the electronic device;
An antenna electromagnetic field distribution selection unit that reads antenna electromagnetic field distribution data corresponding to the antenna represented by the antenna data from the antenna electromagnetic field distribution storage unit and passes it to the antenna electromagnetic field distribution input unit as antenna electromagnetic field distribution data The electromagnetic wave analysis apparatus according to claim 1, further comprising:   The electromagnetic wave analysis apparatus according to claim 1, wherein the electronic device is a mobile phone.   2. The antenna electromagnetic field distribution data is data representing an antenna current distribution in which a magnetic field component of an electromagnetic wave transmitted and received via the antenna is represented by a current or an antenna voltage distribution in which an electric field component of the electromagnetic wave is represented by a voltage. The electromagnetic wave analysis apparatus of any one of -12.   The design support apparatus containing the electromagnetic wave analysis apparatus of any one of Claims 1-13. An electromagnetic wave analysis program for causing a computer to execute processing for examining the influence of unwanted radiation noise generated from a circuit board of an electronic device that transmits and receives electromagnetic waves via an antenna on electromagnetic waves transmitted and received via the antenna,
Antenna electromagnetic field distribution input processing for inputting antenna electromagnetic field distribution data representing the distribution of the electromagnetic field of the antenna that is a magnetic field component or an electric field component of electromagnetic waves transmitted and received via the antenna;
Substrate vicinity electromagnetic field distribution input processing for inputting near-field electromagnetic field distribution data representing the distribution of the electric field component and / or magnetic field component of the near electromagnetic field due to unnecessary radiation noise generated from electronic components provided on the circuit board, and
Correlation value generation processing for generating a correlation value distribution representing the correlation between the electromagnetic field of the antenna and the electromagnetic field near the substrate based on the antenna electromagnetic field distribution data and the substrate electromagnetic field distribution data. An electromagnetic wave analysis program to be executed. An electromagnetic wave analysis method for examining, using a computer, an effect of unwanted radiation noise generated from a circuit board of an electronic device that transmits and receives an electromagnetic wave via an antenna, on the electromagnetic wave that is transmitted and received via the antenna,
An antenna electromagnetic field distribution input unit provided in the computer inputs antenna electromagnetic field distribution data representing an electromagnetic field distribution of an antenna that is a magnetic field component or an electric field component of an electromagnetic wave transmitted and received via the antenna;
Substrate near-field electromagnetic field distribution data in which the near-field electromagnetic field distribution input unit included in the computer represents the distribution of the electric field component and / or magnetic field component of the near electromagnetic field due to unnecessary radiation noise generated from electronic components provided on the circuit board. A process of inputting
A correlation value generation unit provided in the computer generates a correlation value distribution indicating a correlation between the antenna electromagnetic field and the substrate near electromagnetic field based on the antenna electromagnetic field distribution data and the substrate near electromagnetic field distribution data. An electromagnetic wave analysis method including a generating step.

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