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| Number | Title | Issue Date |
| 6774843 | Method for acquiring azimuth information A method for acquiring azimuth information enables acquisition of azimuth information by receiving signals transmitted by GPS satellites using only a single antenna. The method includes steps of disposing a GPS planar antenna having a hemispherical beam with its bea... | 08/10/2004 |
| 6718264 | Method for acquiring azimuth information A method for acquiring azimuth information is provided in which first and second planar patch antennas (11a, 11b) are disposed so that their sky coverage areas partially overlap to form a common area (2), thereby dividing the anten... | 04/06/2004 |
| 7084649 | Method and apparatus for measuring three-dimensional distribution of electric field A method and apparatus are provided that make it possible to speedily measure, and obtain images of, the three-dimensional distribution of electric fields in integrated circuits, using electro-optic sampling. The sampling is performed using a plurality of electric f... | 08/01/2006 |
| 7043201 | Two-way radio communication system and two-way radio communication method Only a first radio station is equipped with a local oscillation signal source. A signal transmitted to a second radio station includes local oscilaation signal components used to up-convert a modulated intermediate frequency band signal in addition to intermediate f... | 05/09/2006 |
| 6819475 | Optical frequency converter An optical frequency converter that can use a low-amplitude, high-frequency signal for converting a wide range of optical frequencies. The optical frequency converter includes a device for modulating a lightwave of a preset frequency with a modulation signal to gene... | 11/16/2004 |
| 6816533 | Laser oscillator A laser oscillator comprises a laser medium, an optical excitation laser diode that irradiates the laser medium with light, a polarizer disposed on an optical path of the laser medium at a first end thereof, a first Porro prism disposed with the optical path coincid... | 11/09/2004 |
| 6788832 | Optical modulator and optical signal and electric wave signal converter using same An optical modulation apparatus includes an optical signal input section, an optical signal propagation path, an optical modulator that modulates the phase of optical signals in at least two of a plurality of optical paths, and a wavelength selective filter that sel... | 09/07/2004 |
| 6738408 | Mode-locked laser apparatus A mode-locked laser apparatus includes a mode-locked laser oscillator, a detection device for detecting changes in the optical path length of the mode-locked laser oscillator by utilizing the chromatic dispersion characteristics of the optical path, an optical path ... | 05/18/2004 |
| 6735226 | Method and apparatus for generating optical pulses A method and apparatus for generating optical pulses using an active mode-locking laser that includes a first modulation device, an optical selection device, a second modulation device and an amplification device. The method includes the steps of using the first mod... | 05/11/2004 |
| 6636747 | Multi-mode radio transmission system In order to utilize several radio communication systems with a radio terminal 1, by preparing the common modulator and demodulator part 2a and reconfigurable modulator and demodulator part 2b in advance and performing function selection means 4 with speci... | 10/21/2003 |
| 6600588 | Reciprocating optical modulation system A, reciprocating optical modulation system includes a device that modulates light of a predetermined frequency by an integer multiple n to produce a group of nth order sidebands thereof; a device that modulates the nth order sidebands to produce (n+1)th o... | 07/29/2003 |
| 6542115 | GPS receiver system for acquiring azimuth information using a pair of GPS receivers A GPS receiver includes an antenna unit, a GPS receiver unit, a result output unit, a data transmitting unit, a data receiving unit, a data processing unit for carrying out calculation on data containing a strength value of each received GPS satellite sig... | 04/01/2003 |
| 6515465 | Method and apparatus for measuring harmonic load-pull for frequency multiplication A method for measuring harmonic load-pull including supplying a fundamental frequency signal to a frequency multiplication device under test and obtaining a target even-order multiplied frequency signal. The fundamental load impedance and an even-harmonic... | 02/04/2003 |
| 6476582 | Battery power supply apparatus In a battery power supply apparatus for low-noise measurement systems or ultra high-sensitivity sensor elements (ultra-sensitive light or microwave sensors, or SQUID, SIS/SNS or other Josephson effect devices, etc.), the power supply device that supplies ... | 11/05/2002 |
| 6438371 | Multimode service radio communication method and apparatus A multimode service radio communication apparatus, that provides a hand-held or vehicle-mounted terminal with radio communication and radio broadcasting information of a radio information and communication providing system including mobile communication s... | 08/20/2002 |
| 6433918 | Optical parametric oscillator An optical parametric oscillator includes a nonlinear element for converting an incident pump beam of angular frequency ωp into a combination of a signal wave of angular frequency ωs and an idler wave of angular frequency ωi | 08/13/2002 |
