Abstract: The electromagnetic-wave-generating-source search method includes the steps of calculating a first electric field strength at a measuring point based on a current distribution belonging to an object to be measured; calculating a second electric field strength at said measuring point by employing the current distribution at a preselected position on said measuring object, the preselected position corresponding to a portion of the current distribution of said measuring object; and calculating a relative ratio of said first electric field strength with respect to said second electric field strength, thereby determining the source generating a remote electric field.

Abstract: A high-frequency signal from a tape-shaped line section having a surface layer signal lead and surface layer GND lead disposed on both sides thereof is directly inputted to a semiconductor chip via a signal surface layer wiring of a package substrate and through solder bump electrodes. Alternatively, a high-frequency signal from the semiconductor chip is outputted to the outside via the tape-shaped line section in reverse. Owing to the transmission of the high-frequency signal by only a microstrip line at the whole surface layer of the package substrate, the high-frequency signal can be transmitted by only the microstrip line at the surface layer without through vias or the like. Accordingly, the high-frequency signal can be transmitted without a loss in frequency characteristic, and a high-quality high-frequency signal can be transmitted with a reduction in loss at high-frequency transmission.

Abstract: A high-frequency signal from a tape-shaped line section having a surface layer signal lead and surface layer GND lead disposed on both sides thereof is directly inputted to a semiconductor chip via a signal surface layer wiring of a package substrate and through solder bump electrodes. Alternatively, a high-frequency signal from the semiconductor chip is outputted to the outside via the tape-shaped line section in reverse. Owing to the transmission of the high-frequency signal by only a microstrip line at the whole surface layer of the package substrate, the high-frequency signal can be transmitted by only the microstrip line at the surface layer without through vias or the like. Accordingly, the high-frequency signal can be transmitted without a loss in frequency characteristic, and a high-quality high-frequency signal can be transmitted with a reduction in loss at high-frequency transmission.

Abstract: The present invention provides a magnetic field measuring method and system for determining the magnetic field of an integrated circuit (IC) inside the IC package, including the pre-packaged IC. In one embodiment, induced voltages due only to the magnetic field are determined at measurement heights on the order of the line spacings in an integrated circuit. A magnetic probe is used; the probe has a loop of wire parallel to the current, for measuring the induced voltage of the horizontal component of the magnetic field. The induced voltage due to the electric field is removed by using a calculation including the difference of two measurements. The magnetic field distribution for the integrated circuit may be determined by using the above procedure on a grid like pattern above the IC.

Abstract: An electronic apparatus is comprised of a circuit apparatus; and an electromagnetic wave absorbing device arranged in the vicinity of the circuit apparatus in an insulating manner with respect to a circuit of the circuit apparatus, and having a metal loop, a portion of which is made of a high resistor. The metal loop contains a first member having a resistor having a resistance value smaller than, or equal to several ohms; and a second member having a resistor having a resistance value larger than, or equal to several ohms, and connected so as to form an electric loop in combination with the first member.

Abstract: The invention provides a transmission line that is fabricated by forming the bottom base that is formed by means of a process in which a groove is formed on a circuit substrate, a conductive film is formed on the surface of the groove, the groove is filled with dielectric material, and a metal conductor is formed on the dielectric material, by forming the top base that is formed by means of a process in which a groove is formed, a conductive film is formed on the surface of the groove, and the groove is filled with dielectric material, and by putting the top base on the bottom base so that the metal conductor is interposed between the top base and the bottom base. Thereby, a transmission line with reduced leakage of the electromagnetic field is provided. Furthermore, an electronic parts or electronic apparatus with good high frequency performance that use the above-mentioned transmission line is provided.

Abstract: In a circuit board having a multilayer structure comprising a ground pattern and a power-supply pattern both, for example, by forming a plurality of slits along each side of the ground pattern or the power-supply pattern, a long thin conduction path connecting a corner and a side center of the ground pattern is formed and resistive elements are placed in the middles of the conduction path to short, circuit the corner and a side center of the ground pattern. Therefore, portions corresponding to an antinode and a node or antinode and an antinode of a standing wave are short-circuited. The standing wave is generated when electric power is supplied to ICs and LSIs mounted on the circuit board. Thus, noise sources caused by the standing wave cancel each other. As a result, the occurrence of an antiresonance phenomenon and an increase in impedance of the power supplying system caused by the standing wave can be suppressed.

Abstract: A reader and/or writer apparatus having an antenna lying substantially in a plane for generating an electromagnetic field to supply power to an IC card and a conductor member to be disposed in a plane substantially parallel to the plane of the antenna, wherein the distance between the antenna and the conductor member is no greater than 20 mm. A power supplying system supplies power using electromagnetic waves from the reader and/or writer apparatus to the IC card. The IC card includes a circuit for converting the supplied power to a D.C. voltage and for supplying the D.C. voltage to an internal circuit of the IC card.

Abstract: The provision of a coplanar waveguide coupled with a microstrip line with a transmission line substrate that is used between two functional units of different impedance characteristics allows the input and output impedance matching to be performed, the impedance matching between which coplanar waveguide and microstrip line is performed by the variation of the signal linewidth. It allows the transmission characteristics of the optical transmission device in high frequency band to improve.

Abstract: A semiconductor device includes a semiconductor die having patterned circuitry, a plurality of terminals coupled to the die, and an indication providing signal noise information of at least one of the terminals.

Abstract: The present invention provides a magnetic field measuring method and system for determining the magnetic field of an integrated circuit (IC) inside the IC package, including the pre-packaged IC. In one embodiment, induced voltages due only to the magnetic field are determined at measurement heights on the order of the line spacings in an integrated circuit. A magnetic probe is used; the probe has a loop of wire parallel to the current, for measuring the induced voltage of the horizontal component of the magnetic field. The induced voltage due to the electric field is removed by using a calculation including the difference of two measurements. The magnetic field distribution for the integrated circuit may be determined by using the above procedure on a grid like pattern above the IC.

Abstract: The electromagnetic wave generating source searching method includes the steps of calculating a first electric field strength at a measuring point based upon a current distribution owned by an object to be measured; calculating a second electric field strength at said measuring point by employing such a current distribution at a preselected position on said measuring object, which corresponds to a portion of the current distribution of said measuring object; and calculating a relative ratio of said first electric field strength with respect to said second electric field strength, thereby judging a source for generating a remote electric field.

Abstract: The electromagnetic wave generating source searching method includes the steps of calculating a first electric field strength at a measuring point based upon a current distribution owned by an object to be measured; calculating a second electric field strength at said measuring point by employing such a current distribution at a preselected position on said measuring object, which corresponds to a portion of the current distribution of said measuring object; and calculating a relative ratio of said first electric field strength with respect to said second electric field strength, thereby judging a source for generating a remote electric field.

Abstract: The present invention comprises a power transmission system, an IC card, and an information communication system using an IC card. In the power transmission system, power is transmitted by radio from the power transmission device to the IC card. In the IC card, the transmitted induced power is converted into a DC voltage, the transmitted induced power or a voltage corresponding to the induced power is detected, and a desired DC voltage to be suppled to the internal circuit is obtained in controlling resistance the detected induced power or the voltage corresponding to the induced power.

Abstract: A low-impedance connection is provided between an LSI and a capacitor (for example, existing internal capacitance of an electronic part) in the power supply path to limit power supply noise, which can be a factor in high-speed logic circuit malfunctions. For example, a packaging substrate and a semiconductor device using the same are provided which reduce power supply path inductance, which is a major factor in impedance.

Abstract: The present invention comprises a power transmission system, an IC card, and an information communication system using an IC card. In the power transmission system, power is transmitted by radio from the power transmission device to the IC card. In the IC card, the transmitted induced power is converted into a DC voltage, the transmitted induced power or a voltage corresponding to the induced power is detected, and a desired DC voltage to be suppled to the internal circuit is obtained in controlling resistance the detected induced power or the voltage corresponding to the induced power.

Abstract: A reader and/or writer apparatus having an antenna lying substantially in a plane for generating an electromagnetic field to supply power to an IC card and a conductor member to be disposed in a plane substantially parallel to the plane of the antenna, wherein the distance between the antenna and the conductor member is no greater than 20 mm. A power supplying system supplies power using electromagnetic waves from the reader and/or writer apparatus to the IC card. The IC card includes a circuit for converting the supplied power to a D.C. voltage and for supplying the D.C. voltage to an internal circuit of the IC card.

Abstract: A reader and/or writer apparatus, a power feeding system and a power feeding and communication transmission and/or reception system in a proximate wireless card system arranged so that power which satisfies the requirement of the Radio Law (500 &mgr;V/m at a distance of 3 m from the reader and/or writer apparatus) regarding the radiated electric field is supplied sufficiently from the reader and/or writer apparatus to the proximate wireless card (IC card). The reader and/or writer apparatus has a spirally shaped or coil-shaped antenna for generating electromagnetic fields both to supply operational power to an IC card and to perform transmission and/or reception of signals for communication to and/or from the IC card and a conductor member for forming a mirror image of the antenna on its back side.

Abstract: The present invention provides a reader and/or writer for performing both the supply of operating power to an IC card and transmission of a communication signal to the IC card or transmission and reception thereof to and from the IC card, wherein a main coil or a spiral antenna for generating an electromagnetic field for the two or at least power supply, and auxiliary coils or spiral antennas for generating magnetic fields opposite in phase to the electromagnetic field generated by the main coil or spiral antenna to thereby restrain the intensity of the electromagnetic field in the distance are provided side by side.

Abstract: The present invention provides a power transmission/communication system for transmitting power from a reader and/or writer to an IC card by an electromagnetic wave and performing transmission or transmission and reception of a communication signal between the reader and/or writer and the IC card by an electromagnetic wave, wherein the intensity of a magnetic field induced by the electromagnetic wave outputted from the reader and/or writer, i.e., the magnitude of power induced thereby and the time required to transmit the power are controlled.