Patent application number | Description | Published |
20090196371 | MIMO ANTENNA APPARATUS CHANGING ANTENNA ELEMENTS BASED ON TRANSMISSION CAPACITY - A controller of a MIMO antenna apparatus calculates a current transmission capacity based on signal levels detected by a signal level detector circuit. The controller calculates an estimated transmission capacity assuming that at least one of antenna elements currently connected to a MIMO modulator and demodulator circuit is changed to a further antenna element not connected to the MIMO modulator and demodulator circuit, based on the detected signal levels and degrees of electromagnetic coupling stored in a degree-of-coupling memory. The controller controls a switch circuit to connect the further antenna element to the MIMO modulator and demodulator circuit when the current transmission capacity becomes lower than the estimated transmission capacity. | 08-06-2009 |
20100013720 | WIRELESS COMMUNICATION APPARATUS WITH HOUSING CHANGING BETWEEN OPEN AND CLOSED STATES - When first and second housings are in an open state, first and second switches are electrically opened, and thus, a first antenna element and a ground conductor operate as a first dipole antenna, and a second antenna element and the ground conductor operate as a second dipole antenna with isolation from the first dipole antenna by the slit. When the first and second housings are in the closed state, the first and second switches are electrically closed, and thus, the first antenna element operates as a first inverted F antenna on the ground conductor, and the second antenna element operates as a second inverted F antenna on the ground conductor with isolation from the first inverted F antenna by the slit. | 01-21-2010 |
20100056234 | MOBILE WIRELESS COMMUNICATION APPARATUS - A housing antenna | 03-04-2010 |
20100069017 | MOBILE WIRELESS COMMUNICATION APPARATUS - A housing antenna | 03-18-2010 |
20100195753 | MINO ANTENNA APPARATUS CAPABLE OF DIVERSITY RECEPTION USING ONE RADIATING CONDUCTOR - A MIMO antenna apparatus is provided with: an upper housing having slits; first feed points through which the upper housing itself is excited as first antennas; second feed points through which the slits are excited as second antennas; switch circuits, each of which is connected to one of the first feed points and one of the second feed points, and connects one of the two feed points to an A/D converter circuit-; a signal level detector circuit detecting signal levels of received radio signals; and a controller that controls the switches to change a feed point connected to the A/D converter circuit, when the detected signal level is less than or equal to a predetermined threshold value. The slits are located between the first antennas. | 08-05-2010 |
20100207823 | ANTENNA APPARATUS INCLUDING MULTIPLE ANTENNA PORTIONS ON ONE ANTENNA ELEMENT - An antenna apparatus is provided with two feed ports respectively provided at positions on an antenna element, and the antenna element is simultaneously excited through the two feed ports so as to simultaneously operate as two antenna portions respectively associated with the two feed ports. The antenna apparatus is further provided with a slit provided between the two feed ports, for changing a resonant frequency of the antenna element and producing isolation between the feed ports at a isolation frequency, and provided with matching means for shifting an operating frequency of the antenna element from the changed resonant frequency to the isolation frequency. | 08-19-2010 |
20100295741 | ARRAY ANTENNA APPARATUS SUFFICIENTLY SECURING ISOLATION BETWEEN FEEDING ELEMENTS AND OPERATING AT FREQUENCIES - An array antenna apparatus includes a first antenna element resonating at a first frequency and a second antenna element resonating at the first frequency, and includes a first connecting line that connects the first connection point located in the first antenna element with a third connection point located in the second antenna element, and a second connecting line that connects the second connection point located in the first antenna element with a fourth connection point located in the second antenna element. Electrical lengths of the first and second antenna elements and those of the first and second connecting lines are set so that a phase difference, between first and second high-frequency signals respectively propagating through first and second signal paths, becomes substantially 180 degrees at the first feeding point, and then, the array antenna apparatus resonances at the first frequency and the second frequency. | 11-25-2010 |
20110122032 | ANTENNA EVALUATION APPARATUS AND ANTENNA EVALUATION METHOD FOR CREATING DIFFERENT SETS OF MULTIPATH WAVES AROUND RECEIVING ANTENNA - An antenna evaluation apparatus includes receiving antennas to be evaluated, scatterer antennas surrounding the receiving antennas, a signal generator, a divider, a phase-shift circuit, and a computer. The computer generates first and second initial phase vectors each corresponding to a different set of multipath waves, determines a third initial phase vector including arbitrary initial phases each between a pair of corresponding initial phases in the first and second initial phase vectors, adjusts the phases of the radio frequency signals using the phase-shift circuit such that the phases of the radio frequency signals have corresponding initial phases in the third initial phase vector, and makes the adjusted radio frequency signals radiate. | 05-26-2011 |
20110128196 | ANTENNA EVALUATING APPARATUS FOR EVALUATING MULTIPLE WAVE OF RADIO WAVES TRANSMITTED FROM SCATTERER ANTENNAS WITH FUNCTION OF SUBSTANTIALLY SIMULTANEOUS STOP AND START - A transmitting signal from a signal generator is divided in seven transmitting signals in a divider, and the phase and the amplitude of each of divided transmitting signals are changed in a phase shifter circuit and an attenuator circuit. The respective transmitting signals from the attenuator circuit are radiated from scatterer antennas. A receiver receives a multiple wave of radiated radio waves by using a receiving antenna. A computer substantially simultaneously starts operations of a D/A converter, the signal generator, and the receiver by using a trigger generator circuit. | 06-02-2011 |
20110128197 | ANTENNA EVALUATION APPARATUS AND ANTENNA EVALUATION METHOD FOR CREATING MULTIPATH WAVES AROUND RECEIVING ANTENNA - An antenna evaluation apparatus includes receiving antennas to be evaluated, scatterer antennas provided around them, signal generators, delay circuits, dividers, phase-shift circuits, and attenuation circuits. A computer controls the delay circuits to add delay times to radio frequency signals, and controls the phase-shift circuits and attenuation circuits to change phases and amplitudes of the radio frequency signals to produce a first fading. The antenna evaluation apparatus radiates the radio frequency signals from the scatterer antennas, thus creating multipath waves including delay and fading around the receiving antenna. | 06-02-2011 |
20110134001 | ANTENNA EVALUATION APPARATUS FOR EVALUATING MULTIPLE WAVE OF RADIO WAVES TRANSMITTED FROM SCATTERER ANTENNAS WITH FUNCTION OF CALIBRATION FOR THE SAME APPARATUS - A computer measures amplitudes and phases respective received signals S | 06-09-2011 |
20110187615 | ANTENNA APPARATUS INCLUDING MULTIPLE ANTENNA PORTIONS ON ONE ANTENNA ELEMENT OPERABLE AT MULTIPLE FREQUENCIES - An antenna apparatus includes a slit provided on an antenna element between first and second feed ports; and a series resonant circuit provided at a location along the slit, with a distance from an opening of the slit. When the antenna apparatus operates at a first isolation frequency identical to a resonance frequency of the series resonant circuit, the series resonant circuit is short-circuited, and only a section of the slit from its opening to the series resonant circuit resonates, thus providing isolation between the feed ports at the first isolation frequency. When the antenna apparatus operates at a second isolation frequency lower than the first isolation frequency, the series resonant circuit is open, and the entire slit resonates, thus providing isolation between the feed ports at the second isolation frequency. | 08-04-2011 |
20110254749 | ANTENNA APPARATUS INCLUDING MULTIPLE ANTENNA PORTIONS ON ONE ANTENNA ELEMENT OPERABLE AT MULTIPLE FREQUENCIES - An antenna element has first and second feed ports, and is simultaneously excited through the feed ports so as to simultaneously operate as first and second antenna portions respectively, associated with the feed ports. The antenna element is excited at one of a first frequency and a second frequency higher than the first frequency. An antenna apparatus is provided with: a slit that provides isolation between the feed ports; a trap circuit that allows the slit to provide isolation at the first or second frequency when the antenna element is excited at the first or second frequency; and a reactance element that shifts a frequency at which the slit provides isolation between the feed ports, to the first frequency, when the antenna element is excited at the first frequency. | 10-20-2011 |
20120007785 | ANTENNA APPARATUS FOR SIMULTANEOUSLY TRANSMITTING MULTIPLE RADIO SIGNALS WITH DIFFERENT RADIATION CHARACTERISTICS - An antenna element has a slit including a first portion and a second portion, the first portion extending in a first direction so as to separate first and second feed points from each other, and the second portion extending in a second direction different from the first direction. The slit is configured to resonate at an isolation frequency to produce isolation between the first and second feed points, and configured to form a current path around the slit. A current distribution along the current path generated by exciting through the first feed point is different from a current distribution along the current path generated by exciting through the second feed point, thus providing different radiation characteristics by the different current distributions. | 01-12-2012 |
20120169559 | ANTENNA APPARATUS INCLUDING MULTIPLE ANTENNA PORTIONS ON ONE ANTENNA ELEMENT ASSOCIATED WITH MULTIPLE FEED POINTS - An antenna apparatus includes: an extension conductor connected to a first section of an outer perimeter of an antenna element and along an entire length of the first section; connecting conductors connecting the antenna element to a ground conductor between the extension conductor and feed points on the antenna element; and a slit extending from the extension conductor to the antenna element so as to intersect a portion between connecting points of the connecting conductors and to intersect a portion between the feed points on the antenna element. The slit has a short-circuited end on the extension conductor. | 07-05-2012 |
20120176276 | ANTENNA APPARATUS INCLUDING MULTIPLE ANTENNA PORTIONS ON ONE ANTENNA ELEMENT ASSOCIATED WITH MULTIPLE FEED POINTS - An antenna apparatus includes: an extension conductor connected to a section of an outer perimeter of an antenna element and along an entire length of the section; and a slit extending from the antenna element to the extension conductor so as to intersect a portion between feed points on the antenna element. The slit has an open end on the extension conductor. | 07-12-2012 |
20130021218 | ANTENNA APPARATUS INCLUDING MULTIPLE ANTENNA ELEMENTS FOR SIMULTANEOUSLY TRANSMITTING OR RECEIVING MULTIPLE WIDEBAND RADIO SIGNALS - An antenna apparatus includes antenna elements, each made of a conductive plate. The antenna elements are provided along a reference axis passing through first and second positions of the antenna apparatus, and close to a section between the first and second positions. Each of the antenna elements has first and second portions along a circumference of the antenna element, the first portion is close to the reference axis and electromagnetically coupled to the other antenna element, and the second portion is remote from the reference axis. The first portions of the respective antenna elements are shaped so that the antenna elements are the closest to each other near the first position, and a distance between the antenna elements gradually increases from the first position to the second position. The antenna apparatus has feed points provided on the antenna elements, respectively, and near the first position. | 01-24-2013 |
20130057443 | ANTENNA DEVICE, AND WIRELESS COMMUNICATION DEVICE - A radiators has looped radiation conductors, an inductor, a capacitor, a feed point on the radiation conductor. The capacitor is formed by a capacitance between the radiation conductors, and the capacitance varies depending on positions on the radiation conductors within a portion where the radiation conductors are close to each other. The radiators is configured to: resonate along a portion of the radiator at a low-band resonance frequency, the portion including the inductor and the capacitor and being along the loop of the radiation conductor, and resonate along a portion of the radiator at a high-band resonance frequency, the portion including a section along the loop of the radiation conductor, the section including at least one of the at least one capacitor, not including the inductor, and extending between the feed point and the inductor. | 03-07-2013 |
20130082898 | ANTENNA APPARATUS PROVIDED WITH TWO ANTENNA ELEMENTS AND SLEEVE ELEMENT FOR USE IN MOBILE COMMUNICATIONS - This antenna apparatus is provided with two antenna elements, two feeding lines, a feeding point provided at one end of the antenna element, and a feeding point provided at the one end of the antenna element. The feeding lines extend in a first direction from the feeding points. The antenna element extends from the feeding point in a second direction perpendicular to the first direction, and the antenna element extends from the feeding point in a third direction which is oriented opposite to the second direction. The antenna apparatus is provided with a sleeve element which has an end which is connected to a respective grounded conductor of each of the feeding lines at positions near the feeding points, and extends in the first direction from the position near the feeding points. | 04-04-2013 |
20130135164 | SMALL ANTENNA APPARATUS OPERABLE IN MULTIPLE BANDS - In a radiator, a large loop is formed by radiation conductors, first and second capacitors, and first and second inductors, and a small loop is formed by portions of the radiation conductors close to each other, the second capacitor, and the second inductor. The radiator is configured such that its first portion, second portion, and third portion resonate at predetermined frequencies, respectively. The first portion extends along the large loop, and includes the first inductor, the first capacitor, and one of the second inductor and the second capacitor. The second portion includes a section extending from a feed point to a second position through one of the first inductor and the first capacitor, and includes the small loop. The third portion includes a section extending from the feed point to the second position through the first capacitor. | 05-30-2013 |
20130229320 | SMALL ANTENNA APPARATUS OPERABLE IN MULTIPLE BANDS INCLUDING LOW-BAND FREQUENCY AND HIGH-BAND FREQUENCY AND SHIFTING LOW-BAND FREQUENCY TO LOWER FREQUENCY - A radiator is provided with a looped radiation conductor, a capacitor, an inductor, a feed point on the radiation conductor, and a magnetic block provided at at least a part of the inside of a loop of the radiation conductor. When the radiator is excited at a low-band resonance frequency, a first current flows through a first path extending along an inner perimeter of the loop of the radiation conductor and including the inductor and the capacitor. Magnetic flux produced by the first current passes through the magnetic block, thus increasing the inductance of the radiation conductor. When the radiator is excited at a high-band resonance frequency, a second current flows through a second path including a section extending along an outer perimeter of the loop of the radiation conductor, the section including the capacitor but not including the inductor, the section extending between the feed point and the inductor. | 09-05-2013 |
20130234902 | SMALL ANTENNA APPARATUS OPERABLE IN MULTIPLE BANDS INCLUDING LOW-BAND FREQUENCY AND HIGH-BAND FREQUENCY AND INCREASING BANDWIDTH INCLUDING HIGH-BAND FREQUENCY - A radiator is provided with a looped radiation conductor, a capacitor, an inductor, a feed point on the radiation conductor, and a dielectric block provided in a portion where the radiation conductor and the ground conductor are close to each other. At a low-band resonance frequency, a current flows through a path extending along an inner perimeter of the loop of the radiation conductor and including the inductor and the capacitor. At a high-band resonance frequency, a current flows through a path including a section extending along an outer perimeter of the loop of the radiation conductor, including the capacitor but not including the inductor, and extending between the feed point and the inductor, and a parallel resonant circuit is formed from: a capacitance between the radiation conductor and the ground conductor between which the dielectric block is provided; and an inductance of the radiation conductor. | 09-12-2013 |
20130249753 | SMALL ANTENNA APPARATUS OPERABLE IN MULTIPLE BANDS INCLUDING LOW-BAND FREQUENCY AND HIGH-BAND FREQUENCY WITH ULTRA WIDE BANDWIDTH - A radiator includes a looped radiation conductor, a capacitor, an inductor, and a feed point on a radiation conductor. In a portion where the radiation conductor and a ground conductor are close to each other, a distance between the radiation conductor and the ground conductor gradually increases as a distance from the feed point along the looped radiation conductor increases. When the radiator is excited at a low-band resonance frequency, a current flows along a first path extending along an inner perimeter of the looped radiation conductor and including the inductor and the capacitor. When the radiator is excited at a high-band resonance frequency, a second current flows through a second path including a section extending along an outer perimeter of the looped radiation conductor, and the section including the capacitor but not including the inductor, and the section extending between the feed point and the inductor. | 09-26-2013 |
20140002320 | ANTENNA APPARATUS OPERABLE IN DUALBANDS WITH SMALL SIZE | 01-02-2014 |
20140054973 | Information transmission apparatus and system using inductive coupling between coils - An information transmission system is provided with a transmission coil and a reception coil respectively provided along a first surface and a second surface that face each other proximal to each other. The transmission coil and reception coil are provided proximally to be electromagnetically coupled to each other. The winding wire of the transmission coil is wound on the first surface, and the winding wire of the reception coil is wound on the second surface. The information transmission system is provided with a magnetic body provided proximately so as to be electromagnetically coupled to the transmission coil and the reception coil to cover at least one part of a region in which at least the winding wires of the transmission coil and reception coil are present between the first surface and the second surface. | 02-27-2014 |
20140056368 | CONTACTLESS COMMUNICATION SYSTEM AND DIPOLE ANTENNA - Provided is a contactless communication system in which each device performing communication in the system includes a dipole antenna having a length which is less than half of wavelength of a clock frequency of digital baseband signals which are communicated. The dipole antennas are disposed in opposing positions to one another. The contactless communication system performs short distance contactless communication of the digital baseband signals using a frequency band which does not include a resonant frequency of the dipole antennas. | 02-27-2014 |
20140084698 | NONCONTACT CONNECTOR APPARATUS AND SYSTEM USING INDUCTIVE COUPLING BETWEEN COILS - A power transfer system is provided with a transmission coil and a reception coil respectively provided along a first surface and a second surface that face each other proximal to each other. The transmission coil and reception coil are provided proximally to be electromagnetically coupled to each other. The winding wire of the transmission coil is wound on the first surface, and the winding wire of the reception coil is wound on the second surface. The power transfer system is provided with a magnetic body provided proximately so as to be electromagnetically coupled to the transmission coil and the reception coil to cover at least one part of a region in which at least the winding wires of the transmission coil and reception coil are present between the first surface and the second surface. | 03-27-2014 |
20140197694 | CONTACTLESS CONNECTOR SYSTEM TOLERANT OF POSITION DISPLACEMENT BETWEEN TRANSMITTER COIL AND RECEIVER COIL AND HAVING HIGH TRANSMISSION EFFICIENCY - A contactless connector apparatus is provided with a first coil closely opposed to a second coil so as to be electromagnetically coupled thereto. The first coil includes: an inner transmitter coil wound around an axis passing through its center; and an outer transmitter coil wound around the axis and outside the inner coil. One end of the outer transmitter coil is connected to one end of the inner transmitter coil such that, when a current flows through the transmitter coils, a direction of a loop current generated around the axis by a current flowing through the inner transmitter coil is opposite to that of a loop current generated around the axis by a current flowing through the outer transmitter coil. A self-inductance of the outer transmitter coil is larger than that of the inner transmitter coil. | 07-17-2014 |