Abstract: Provided is a noise equivalent circuit for completing an EMC analysis in a practical time and through a low-cost calculation process at an upstream stage of system design. The noise equivalent circuit includes one or more energy sources; a propagation path for propagation of energy from the energy source including a conductive path such as a cable and an electromagnetic field coupling path due to the coupling of an electric field and a magnetic field with another electronic device or cable; and a GND port connected to a system, and each port is represented by the noise voltage source or the noise current source and the internal impedance. This noise equivalent circuit can determine an external impedance that is varied depending on a load connected externally or the distance from an external device or a cable, whereby the noise of the system as a whole can be analyzed.

Abstract: Provided is an electromagnetic wave visualization device capable of visualizing multiple sources of electromagnetic noise in real time in a far field and a near field. The electromagnetic wave visualization device includes a sensor configured to detect an electromagnetic wave and output a detection signal of intensity depending on energy level of the detected electromagnetic wave, a variable resistance connected to the sensor, and a resistance adjustment unit configured to adjust a resistance value of the variable resistance connected to the sensor. The electromagnetic wave is visually measured by adjusting a resistance value of the variable resistance at the adjustment unit.

Abstract: Provided is a noise equivalent circuit required for completing an EMC analysis in a practical time and through a low-cost calculation process at an upstream stage of system design. According to the present invention, the noise equivalent circuit comprises: one or more energy sources; a propagation path for propagation of energy from the energy source including a conductive path such as a cable and an electromagnetic field coupling path due to the coupling of an electric field and a magnetic field with another electronic device or cable; and a GND port connected to a system, and is characterized in that each port is represented by the noise voltage source or the noise current source and the internal impedance. This noise equivalent circuit can be used to determine an external impedance that is varied depending on a load connected externally or the distance from an external device or a cable, whereby the noise of the system as a whole can be analyzed (see FIG. 1).

Abstract: There is provided a technique in which a direction of current to be an electromagnetic wave source is precisely measured in a short time. An electromagnetic wave source survey method according to the present invention measures an absolute value of induced voltages by using three or more odd number of antennas whose arrangement angles seen from the reference position on a same plane are different from one another, and a vectorial angle of the current is calculated by using the arrangement angle of each antenna and the induced voltages (see FIG. 3).

Abstract: A system and method for automatically calculating an optimum layout of a wireless cell station in an environment using a wireless communication system, thereby achieving a timesaving and resources-saving cell design procedure. The system calculates an optimum layout of the wireless cell station based on information of terminal locations.

Abstract: A communication system is provided of selecting the most approximate line from two or more connectable lines and connecting with a provider through the selected line in the mobile communication environment. The mobile device and the public phone of each phone company provide a standard wireless data communication facility, respectively. The public line pre-stores information about dial-up numbers of access points and a transmission speed of an internet provider. When the user starts the communication, the mobile device operates to obtain the most approximate access point information from each of the public phones and then dial up the most approximate access point through the public phone/line well-specified to the user.

Abstract: A wireless LAN system is provided to make a frequency band setup task easy such that interference among base stations is reduced. The base station connected to a wired LAN includes a wired connection unit connected to the wired LAN and a wireless communication unit communicating with a LAN terminal via radio waves. The base station finds frequency bands already used by other devices in a place where the base station is installed and sets up a frequency band not used by the other devices as a frequency band to be used by the wireless communication unit to automatically set up a frequency band of radio waves to be used by the wireless communication unit.

Abstract: A shield structure that transmits a radio wave in a specific frequency band and that exhibits a high shield characteristic in other bands. An opening portion having a specific shape and a specific perimeter length is formed on a conductor. A filter having a specific shape and a specific size is connected to the opening portion.

Abstract: A optical device including conductive films having a first and second surfaces, one hole, surface specific shapes periodically, and a layer inserted as an intermediate layer between the first and the second surface of conductive films. The intermediate layer has the effect for improving surface roughness of the surface of conductive film. A light incident upon one surface enhances an intensity transmitted though the hole.

Abstract: A communication system is provided of selecting the most approximate line from two or more connectable lines and connecting with a provider through the selected line in the mobile communication environment. The mobile device and the public phone of each phone company provide a standard wireless data communication facility, respectively. The public line pre-stores information about dial-up numbers of access points and a transmission speed of an internet provider. When the user starts the communication, the mobile device operates to obtain the most approximate access point information from each of the public phones and then dial up the most approximate access point through the public phone/line well-specified to the user.

Abstract: A printed circuit board with reduced noise effects and without the need to increase the distance between a noise source and a wireless communication board. The circuit board includes multilayer structural conductive layers having a first conductive plane connected to power supply potential and a second conductive plane connected to ground potential. The first and second conductive planes are formed such that an electric field generated by a potential difference between the first conductive plane and the second conductive plane is concentrated on one side of one of the first conductive plane and the second conductive plane. The conductive plane associated with the concentrated electric field and the wireless communication board are on different sides relative to the conductive plane that is not associated with the concentrated electric field.

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: A method for distributing a cipher code in a wireless network system including a mobile terminal and a fixed station includes the steps of making a registration request from a mobile terminal to the fixed station as a terminal with which communication is to be made, changing a communication range of the fixed station in accordance with the registration request and distributing an initial cipher code from the fixed station to the mobile terminal while the communication range changed. It is possible to safely make initial registration of a user and to distribute a cipher code used for communication by use of a fixed station alone, to limit the cost of an entire system and to reduce burden to a manager.

Abstract: A printed circuit board in which effect of noise is reduced without increasing distance between a noise source and a wireless communication board. The above-mentioned printed circuit board is applied to an information processing apparatus having a wireless communication function. As a result, a small-sized information processing apparatus having improved throughput of wireless communication and increased communication distance is provided.

Abstract: A shield structure that transmits a radio wave in a specific frequency band and that exhibits a high shield characteristic in other bands. An opening portion having a specific shape and a specific perimeter length is formed on a conductor. A filter having a specific shape and a specific size is connected to the opening portion.

Abstract: There is provided a technology for realizing an PCI expansion adapter for a PC card which is connectable to a desktop type personal computer PCI expansion connector using a low profile PCI. The PCI expansion adapter includes an expansion unit which is provided with an electrical connector to a PCI bus, a low profile PCI expansion board provided with a PC card control element and an electrical connector to the PC card, wherein the low profile PCI expansion board and the expansion unit are connected by the electrical connectors mounted on the respective boards.

Abstract: An optical device is provided including a conductive film having first and second surfaces, at least one aperture provided in the conductive film and extending from the first surface to the second surface, and a surface topography formed on at least one of the first and second surfaces, wherein said surface topography increases an intensity of light incident onto one of said first and second surfaces and transmitted through said aperture, wherein a region on which the surface topography is formed is larger than a region where the light is incident on the conductive film surface, and the aperture is formed on the region on which the surface topography is formed.

Abstract: A optical device including conductive films having a first and second surfaces, one hole, surface specific shapes periodically, and a layer inserted as an intermediate layer between the first and the second surface of conductive films. The intermediate layer has the effect for improving surface roughness of the surface of conductive film. A light incident upon one surface enhances an intensity transmitted though the hole.

Abstract: A system and method for automatically calculating an optimum layout of a wireless cell station in an environment using a wireless communication system, thereby achieving a timesaving and resources-saving cell design procedure. The system calculates an optimum layout of the wireless cell station based on information of terminal locations.

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.