Abstract: In an antenna that has high sensitivity to frequencies of narrow bands and over a wide band and that can be small-sized, and in a wireless module, wireless unit and wireless apparatus using this antenna, the antenna is comprised of a transmission line, and variable capacitance means connected to this transmission line, and the variable capacitance means controls the resonant frequency.

Abstract: The problems to be solved by the present invention are to provide an antenna which is applied to a wireless identification system wherein there is a long distance between a device to execute identification and a device attached to an object to be identified and which does not cause deterioration in aesthetic terms and covering of a meaningful symbol, and further to provide a wireless system using the antenna. According to the present invention, there are provided an antenna having a circularly polarizing function and a frequency equalizing function achieved by a grid structure having roughness and fineness around a feeding point and density which allows visible light to pass through, an RFID tag using the antenna, and an RFID system using the tag.

Abstract: A small antenna operating in multiple modes including three or more modes. There are provided an antenna that includes a ground conductor having a ground potential, a single feeding point whose one end is formed by a part of the ground conductor, and a plurality of transmission lines to which RF power supplied to the feeding point is input, the transmission lines each radiating electromagnetic waves of three frequencies of three modes into space. These transmission lines comprises a transmission line 41 that is connected to the feeding point at one end and to a branching point at the other end, a transmission line connected between branching points, and transmission lines connected to the branching points. The lengths of the respective transmission lines are set so that impedance matching is performed at the feeding point with respect to a plurality of frequencies. The antenna is formed from an integrated metal plate.

Abstract: In an antenna that has high sensitivity to frequencies of narrow bands and over a wide band and that can be small-sized, and in a wireless module, wireless unit and wireless apparatus using this antenna, the antenna is comprised of a transmission line, and variable capacitance means connected to this transmission line, and the variable capacitance means controls the resonant frequency.

Abstract: There is a need for preventing a feed line from generating undesirable radiation that may degrade array antenna characteristics. An array antenna is configured as a set of small planar elements of conductor. Density distribution of the small planar elements of conductor occurs at a cycle corresponding to a wavelength of a wireless system using the array antenna. The density distribution is formed along a specified length direction corresponding to a given azimuth angle.

Abstract: A distributed phase type circular polarized wave antenna is composed of a group of narrow conductor lines 2a, 2b, 2c and 2d, and the group of the narrow conductor lines 2a, 2b, 2c and 2d are laid out in a two-dimensional plane. Complex vectorial sums of respective projections of current induced in each point of the narrow conductor lines 2a, 2b, 2c and 2d in two directions orthogonal to each other in the two-dimensional plane are determined, such that amplitudes of the complex vectorial sums are equal to each other in the two directions and a phase difference between the complex vectorial sums in the two directions is 90°.

Abstract: An image display device includes a display panel having plural pixels and a second board having a transmitting electrode, the display panel having a first substrate that is disposed so as to overlap the second board, each pixel having a pixel electrode and a counter electrode, and the counter electrode being formed in a planar shape and being commonly provided to the pixel electrodes of each pixel; the counter electrode being divided into a portion A corresponding to the transmitting electrode of the second board and a portion B other than it, and the portions A and B of the counter electrode being connected to a common voltage through resistors. The portion A of the counter electrode constitutes the receiving electrode, and the portion A of the counter electrode acting as the receiving electrode is connected to a receiving circuit in the display panel through a decoupling capacitor.

Abstract: A distributed phase type circular polarized receiving module provided with a plane, a power feed point 4 formed on the plane, and a group of narrow conductors 101 having a substantially one-dimensional current distribution, and the narrow conductors being distributed in two dimension on the plane, a transistor 9 connected to the power feed point 4, sums of projections of complex vectors of current distributions induced on the narrow conductors 101 in first and second directions orthogonal to each other defined on the plane are determined in amplitude and phase, such that amplitudes are approximately equal to each other and a phase difference is approximately 90°.

Abstract: An antenna module formed with an integrated multilayer substrate having: an antenna with a transmission line; a tuned circuit with a variable capacitance means; a low noise amplifier; and a wave-shaping circuit. The variable capacitance means in the tuned circuit controls a resonance frequency of the antenna by an external control signal being wave-shaped by the wave-shaping circuit, and the antenna outputs a high-frequency output tuned to the controlled resonance frequency to the low noise amplifier directly and then the low noise amplifier outputs the amplified high-frequency output to outside.

Abstract: In order to restrain increase in frame area caused along with a larger number of channels to a minimum, there is provided an image display device that adopts a communication method in which a signal is transmitted/received with the use of electrostatic capacitance coupling. A first board includes: a tabular first power supply line, a tabular second power supply line, a semiconductor element, and a tabular first electrode group. A second board includes: a tabular second electrode group and a tabular common electrode. In a state where the first board and the second board are laid on each other, the first electrode group overlaps the second electrode group while one of the first power supply line and the second power supply line overlaps the common electrode.

Abstract: A leakage loss line type circularly-polarized wave antenna is provided with 3 or more conductor lines having losses caused by electromagnetic radiation and being connected to a single power feed point. The projection of the conductor lines onto a plane perpendicular to a straight line that connects the power feed point and one point in the distance is in a positional relationship so that the projection of at least one conductor line is perpendicular to the projection of the remaining conductor lines.

Abstract: A communication system by electrostatic coupling and electromagnetic induction includes: a first transmission part (3a) and a first reception part (3b) which exchange data therebetween through non-contact communication using electrostatic coupling; a second transmission part (4a) and a second reception part (4b) which exchange data therebetween through non-contact communication using electromagnetic induction; and an image display device (8) which displays an image based on the data thus received. With this configuration, it is possible to make communication performed by the first transmission part (3a) and the first reception part (3b) communication with higher speed, larger volume, and higher reliability.

Abstract: Provided is a capacitor coupling type power transmission circuit in which a variation in receiving side voltage due to a variation in capacitance is suppressed to prevent an influence on a variation in load current in a display panel. An insulating board of the display panel is sandwiched by capacitive coupling electrodes formed on each of a transmitting side board and a board of the display panel, thereby forming capacitors. A non-contact transmission is performed by the capacitors. An alternating current voltage signal obtained by electrodes on a display panel side is rectified by a rectifier including diodes. A constant voltage circuit which is a shunt regulator including a diode array in which a resistor and a plurality of diodes are connected in series is provided to maintain a stabilized voltage irrespective of a variation in load in the display panel.

Abstract: A capacitive coupling-type transmitting and receiving circuit for information signal is provided in which attenuation of a signal on a non-contact transmission path via a capacitor and a change of voltage on the receiving side due to a slight change in capacitance are suppressed, modulation and demodulation processes of signals are unnecessary, and non-contact transmission which does not depend on the transmission rate is enabled. The capacitor is formed with a transmitting electrode on a transmission board and a receiving electrode on a display panel board, and an insulating member is interposed between the electrodes. The transmitting board comprises a transmission signal processing circuit which converts display data from an external signal source into a voltage signal. The display panel board comprises an impedance converter circuit and a reception signal processing circuit.

Abstract: A small size thin type antenna using a thin type structure having a wavelength compaction effect without using a bulk conductive material and a high frequency module using the same are disclosed. The small size thin type antenna comprises an open stub 3 including at least one transmission line 13, 16, a connecting line 5 including at least one transmission line 15, and a short stub 4 including a transmission line 14. A characteristic impedance Zo of the open stub 3 is determined to be lower than a characteristic impedance Zb of the connecting line 5 and a characteristic impedance Zs of the short stub 4.

Abstract: An RFID tag of the present invention is provided to suppress variations in the capacity component that occur during physical coupling between an antenna and a semiconductor chip as part of the manufacturing process. The RFID tag includes an antenna with a pair of electric contacts, draw-out conductors of the electric contacts, and an RFID chip with a pair of electric contacts, wherein the electric contacts of the antenna are encompassed to their corresponding electric contacts of the RFID chip, and draw-out electrodes are drawn out in an opposite direction to the facing direction overlapped direction).

Abstract: A group of metallic conductors 1 are prepared and a power feed point 2 is formed at one of the metallic conductors to provide a circular polarized wave antenna. The circular polarized wave antenna is designed such that an absolute value of a sum of projections of an electric current induced on the metallic conductors in x-axis and an absolute value of a sum of projection of the electric current in y-axis that is spatially orthogonal to the x-axis are approximately equal to each other, and an absolute value of a difference between an argument of the sum of the projections in the x-axis and an argument of the sum of the projection in the y-axis is approximately 90°.

Abstract: A distributed phase type circular polarized wave antenna provided with a plane, a power feed point 4 formed on the plane; and narrow conductor groups 1, 2 composed of narrow conductors 101 having a substantially one-dimensional current distribution, the narrow conductor groups being distributed in two dimension on the plane, and sums of projections of complex vectors of current distributions induced on the narrow conductors in first and second directions orthogonal to each other defined on the plane are determined in amplitude and phase, such that amplitudes are approximately equal to each other and a phase difference is approximately 90°.

Abstract: The problems to be solved by the present invention are to provide an antenna which is applied to a wireless identification system wherein there is a long distance between a device to execute identification and a device attached to an object to be identified and which does not cause deterioration in aesthetic terms and covering of a meaningful symbol, and further to provide a wireless system using the antenna. According to the present invention, there are provided an antenna having a circularly polarizing function and a frequency equalizing function achieved by a grid structure having roughness and fineness around a feeding point and density which allows visible light to pass through, an RFID tag using the antenna, and an RFID system using the tag.

Abstract: When supplying a power from a base station to a terminal station on radio and a distance from a base station to a terminal station is long, it becomes impossible for the terminal station to rectify the power. The feature of the present invention is found in a wireless communication system in which the peak value and duty ratio of a transmission power are controlled simultaneously, keeping the transmission power of a base station below a fixed value, thereby allowing a voltage to be applied to a diode, which is a component of a rectifier circuit possessed by a terminal station, always in excess of a threshold voltage of the diode, and energy is exchanged between the base station and the terminal station below a limit power.