Abstract: A rotary system mounted piezoelectric generator has a folded beam structure in which the whole or part of a spring is formed with a piezoelectric generation element, in which one end is provided in a drive rotation system and in which a weight is attached to the other end, the degree of freedom of motion of the weight is two or more-dimensional and thus it is possible to easily change the locus thereof. The beam has a spiral structure such that when the drive rotation system is rotated, a centrifugal force applied to the weight is efficiently modulated by a second force other than the centrifugal force. A self-powered wireless communication terminal is operated with an extremely small amount of power consumption by use of a wireless connection control means and a modulation scattering response antenna which perform multilevel phase-shift keying (MPSK).

Abstract: A rotary system mounted piezoelectric generator has a folded beam structure in which the whole or part of a spring is formed with a piezoelectric generation element, in which one end is provided in a drive rotation system and in which a weight is attached to the other end, the degree of freedom of motion of the weight is two or more-dimensional and thus it is possible to easily change the locus thereof. The beam has a spiral structure such that when the drive rotation system is rotated, a centrifugal force applied to the weight is efficiently modulated by a second force other than the centrifugal force. A self-powered wireless communication terminal is operated with an extremely small amount of power consumption by use of a wireless connection control means and a modulation scattering response antenna which perform multilevel phase-shift keying (MPSK).

Abstract: An RF tag system is provided, in which in addition to a method of easily sending back MPSK modulated sub-carrier signals on the RF tag side, communication protocols and circuit systems for accurately demodulating modulated waves on the RF tag reader side can be implemented, data transmission from an RF tag to an RF tag reader can be realized over a long operating distance at high speed, and an RF tag can be operated for a long lifetime.

Abstract: In order to implement novel utilization methods, implementation of a low power consumption and high sensitivity RF receiving system is desired. A microwave frequency band stub resonance booster circuit characterized by boosting the amplitude of an RF signal in a passive operation by resonating in series a 0.2 pF to 0.01 pF micro-capacitor element with a ?g/2 open stub element to perform impedance conversion of the input RF signal is used. In addition, since a capacitor which has been conventionally inserted in order to repeat charging and discharging of the RF signal by using two diodes becomes useless by putting a DC resonant component of resonant-boosted output into an open state when voltage-doubling and rectifying the resonant-boosted RF signal, rectified output can be obtained and high-sensitivity reception and detection of the RF signal becomes possible without being affected by the capacitor which imparts comparatively large insertion loss.

Abstract: An RF tag system is provided, in which in addition to a method of easily sending back MPSK modulated sub-carrier signals on the RF tag side, communication protocols and circuit systems for accurately demodulating modulated waves on the RF tag reader side can be implemented, data transmission from an RF tag to an RF tag reader can be realized over a long operating distance at high speed, and an RF tag can be operated for a long lifetime.

Abstract: In order to implement novel utilization methods, implementation of a low power consumption and high sensitivity RF receiving system is desired. A microwave frequency band stub resonance booster circuit characterized by boosting the amplitude of an RF signal in a passive operation by resonating in series a 0.2 pF to 0.01 pF micro-capacitor element with a ?g/2 open stub element to perform impedance conversion of the input RF signal is used. In addition, since a capacitor which has been conventionally inserted in order to repeat charging and discharging of the RF signal by using two diodes becomes useless by putting a DC resonant component of resonant-boosted output into an open state when voltage-doubling and rectifying the resonant-boosted RF signal, rectified output can be obtained and high-sensitivity reception and detection of the RF signal becomes possible without being affected by the capacitor which imparts comparatively large insertion loss.

Abstract: An RF tag system is provided, in which in addition to a method of easily sending back MPSK modulated sub-carrier signals on the RF tag side, communication protocols and circuit systems for accurately demodulating modulated waves on the RF tag reader side can be implemented, data transmission from an RF tag to an RF tag reader can be realized over a long operating distance at high speed, and an RF tag can be operated for a long lifetime.

Abstract: There is provided a sensor tag device capable of detecting event data by a sensor tag all the time even when no radio wave is received, saving power supply for a microprocessor, and enlarging the radio communication distance. The sensor tag device includes generation means 6 and 7 using one or more environmental changes, power supply voltage rise control means 8, and power supply synthesis means 9, and power is supplied to a microprocessor 12 and event data is stored in the microprocessor 12 when an event, i.e., an environmental change has occurred. A power receiving circuit having a transmission/reception antenna, a built-in power receiving circuit, and the microprocessor and capable of bi-directional communication by radio waves is combined with a stab resonance RF boost circuit and a ladder boost rectification circuit.

Abstract: A highly efficient thin slot antenna having a cavity and an RFID tag device are provided, in which such flexible properties can be provided to the antenna that the antenna can be worn on the curved surface of a human body, an object, or the like as well as the antenna can be relatively freely deformed, and changes in the characteristics caused by deformation and changes in the characteristics caused by a product to mount the antenna thereon. are extremely small. Conductive foil such as aluminum or foil vapor deposited with conductive metal such as aluminum is used to form a bag shape for configuring a bag-shaped product having a cavity (12). A relatively soft dielectric sheet (13) is provided inside the cavity (12), and a slot (14) is provided lengthwise on one side of the bag-shaped product at the center position in the width direction.

Abstract: The present invention aims to overcome the drawback with conventional RFID tag devices having a short communication range, and expand the communication range to several times or more that in the conventional scheme. The conventional scheme is based on equilibrium feeding/equilibrium modulation (a two-terminal circuit for antenna operation), whereas the present invention is based on disequilibrium feeding/equilibrium modulation (a three-terminal circuit for antenna operation). The conventional scheme is based on simple rectification of received RF signals, whereas the present invention employs a circuit based on a combination of a stub resonance-based, impedance transformation boosting scheme and a ladder boosting scheme. The conventional scheme is based on ASK or BPSK modulation, whereas the present invention is based on passive modulation, but can employ a QPSK modulation circuit.

Abstract: An RF tag system is provided, in which in addition to a method of easily sending back MPSK modulated sub-carrier signals on the RF tag side, communication protocols and circuit systems for accurately demodulating modulated waves on the RF tag reader side can be implemented, data transmission from an RF tag to an RF tag reader can be realized over a long operating distance at high speed, and an RF tag can be operated for a long lifetime.

Abstract: Provided are a highly efficient thin slot antenna having a cavity, and a RFID tag device. The thin slot antenna can be attached to curved surfaces of a human body, things and the like, and furthermore, has relatively freely deformable flexible characteristics, and has an extremely small characteristic change due to deformation and that due to bodies to be attached to. A bag-like body having a cavity (12) is formed by using a conductor foil of aluminum or the like or a foil deposited with a conductive metal such as aluminum and by forming the foil in bag shape. A relatively soft dielectric sheet (13) is put in the cavity (12), and a slot (14) is arranged at the width direction center position on one surface of the bag-like body, in the longitudinal direction.

Abstract: There is provided a sensor tag device capable of detecting event data by a sensor tag all the time even when no radio wave is received, saving power supply for a microprocessor, and enlarging the radio communication distance. The sensor tag device includes generation means 6 and 7 using one or more environmental changes, power supply voltage rise control means 8, and power supply synthesis means 9, and power is supplied to a microprocessor 12 and event data is stored in the microprocessor 12 when an event, i.e., an environmental change has occurred. A power receiving circuit having a transmission/reception antenna, a built-in power receiving circuit, and the microprocessor and capable of bi-directional communication by radio waves is combined with a stab resonance RF boost circuit and a ladder boost rectification circuit.

Abstract: The present invention aims to overcome the drawback with conventional RFID tag devices having a short communication range, and expand the communication range to several times or more that in the conventional scheme. The conventional scheme is based on equilibrium feeding/equilibrium modulation (a two-terminal circuit for antenna operation), whereas the present invention is based on disequilibrium feeding/equilibrium modulation (a three-terminal circuit for antenna operation). The conventional scheme is based on simple rectification of received RF signals, whereas the present invention employs a circuit based on a combination of a stub resonance-based, impedance transformation boosting scheme and a ladder boosting scheme. The conventional scheme is based on ASK or BPSK modulation, whereas the present invention is based on passive modulation, but can employ a QPSK modulation circuit.

Abstract: Arrival directions and patterns of intensities of radiowaves are observed by a monitor station 12a. An observed pattern given by the monitor station 12a is compared with simulated patterns of intensities and emitting directions of a simulated radiowave, and a position whose simulated pattern shows the best correlation with the observed pattern given by the monitor station 12a is identified as a location of the radiowave emitting source. Accordingly, a time for preparing data base by the radiowave propagation simulation can be decreased, and the radiowave monitor can be more efficient.

Abstract: A field distribution measuring method for measuring a spatial distribution of an electric field or a magnetic field at a plurality of sampling points. The method includes the steps of continuously sweeping the sampling points by a probe, in which, based on spurious spectra generated by offsets between positions of the probe and measuring timings, a shift amount of the sampling points is computed, and, taking into account the shift amount, a distribution of electric fields or magnetic fields is measured. The method further includes a step of removing the measured noises generated due to the offsets between sweeping positions of the probe and the measuring timings.

Abstract: A field distribution measuring method for measuring a spatial distribution of an electric field or a magnetic fields at a plurality of sampling points by the probe continuously sweeping the sampling points, in which, based on spurious spectra generated by offsets between positions of the probe and measuring timings, a shift amount of the sampling points is computed, and, taking into account the shift amount, a distribution of electric fields or magnetic fields is measured. Thus, measured noises generated due to offsets between sweeping positions of the probe and measuring timings can be properly removed.

Abstract: Arrival directions and patterns of intensities of radiowaves are observed by a monitor station 12a. An observation result given by the monitor station 12a is compared with a simulation result of arrival directions and patterns of intensities of radiowaves emitted from the monitor station 12a, which are to be observed at other plural positions, and that of the plural positions whose simulation result shows the arrival direction and the pattern of the intensities of the radiowave most correlated with the observation result given by the monitor station 12a is identified as a location of the radiowave emitting source. Whereby a time for preparing data base by the radiowave propagation simulation can be decreased, and the radiowave monitor can be more efficient.

Abstract: Antenna elements A1 to A24 of a ring-shaped array antenna are selectively connected to power combiners each with a switch SH1, SH2 and SH3 one after another. When a direct wave and a reflected wave arrive in the directions of the antenna elements A5 and A3, respectively, the antenna elements A2, A5 and A8 in the power combiner SH2 are selected and their received signals are input into a receiver Rr to obtain therefrom an output Sr(2+5+6, f), and the respective antenna elements of the power combiners SH1 and SH3 are sequentially selected and their received signals are input into a receiver Rm to obtain therefrom outputs Sm(1, f), Sm(3, f), . . . . The outputs from the receivers Rr and Rm are caused to interfere with each other in an interferer 11 to detect an interference output to obtain data E(K, L).

Abstract: Scanning sensor scans on a circumference and simultaneously a radiation wave is received by scanning sensor to generate received signal Sm(f). A radiation wave is received by a fixed sensor at a position not changed with respect to the center of a circle with the circumference to generate received signal Sr(f). The received signal Sm(f) is made to interfere with the received signal Sr(f) to acquire an interference signal. The interference signal is detected to obtain measured data E(r,&phgr;) at each point on the circumference. Also, evaluation data V(&phgr;′) is calculated to estimate a direction of the radiation wave based on measured data E(r,&phgr;) at each point. A multi-dimensional hologram data processing apparatus consists of N-dimensional data array memory, N-dimensional flag array memory, N-dimensional array address generating unit, and digital signal processing unit.