Class / Patent application number | Description | Number of patent applications / Date published |
343750000 | Adjustable reactance | 40 |
20080238789 | Antenna interface circuits including multiple impedance matching networks that are respectively associated with multiple frequency bands and electronic devices incorporating the same - An electronic device includes an antenna, a radio frequency circuit, and an impedance matching circuit that is connected between the antenna and the radio frequency circuit. The impedance matching circuit includes a plurality of impedance matching networks that are respectively associated with frequency bands used by the radio frequency circuit. | 10-02-2008 |
20090015497 | ANTENNA STRUCTURE AND WIRELESS COMMUNICATION APPARATUS INCLUDING SAME - In an antenna structure in which a base is mounted in a ground region on a circuit board, the base having formed thereon a driven radiating electrode and a parasitic radiating electrode, the parasitic radiating electrode causing multiple resonance at least in a harmonic resonant frequency band of the driven radiating electrode, capacitance loading means for loading a capacitance to a harmonic-mode zero voltage region of the driven radiating electrode is provided. The capacitance loading means is electrically connected to a ground electrode in the ground region on the circuit board via a grounding conduction path and switching means. By switching the switching means ON/OFF, capacitance loading by the capacitance loading means to the harmonic-mode zero voltage region of the driven radiating electrode is switched ON/OFF to switch a base resonant frequency in a base resonant frequency band of the driven radiating electrode. | 01-15-2009 |
20090027286 | ANTENNA APPARATUS AND WIRELESS DEVICE - According to an aspect of the invention, there is provided an antenna apparatus comprising: a substrate comprising an end portion; antenna elements connected to the end portion through a connecting portion; and a conductive line path provided between adjacent antenna elements, both ends of the conductive line path connected to the end portion. A distance between both ends of the conductive line path is shorter than a quarter wavelength of an operating frequency of the antenna elements. A path difference between a first path length from an connecting portion of one of the antenna elements to an connecting portion of the other of the antenna elements through both ends of the conductive line path and a second path length from the connecting portion of one of the antenna elements to the connecting portion of the other of the antenna elements through the conductive line path is a half wavelength of the operating frequency. | 01-29-2009 |
20090273531 | ANTENNA DEVICE AND WIRELESS COMMUNICATION APPARATUS - A compact and low-cost antenna device in which no interference occurs even when many antenna units corresponding to various systems are mounted close together in a small area, and a wireless communication apparatus including the antenna device. An antenna device includes plural antenna units mounted on a single dielectric base. A first antenna unit having a lowest fundamental frequency is disposed at a left end of a non-ground region, a second antenna unit having a highest fundamental frequency of the plurality of the antenna units is disposed at a right end of the non-ground region, and a third antenna unit having a fundamental frequency between those of the first antenna unit and the second antenna unit is disposed between the first and second antenna units. A current-density control coil is connected between a first radiation electrode and a power feeder of the first antenna unit, while a reactance circuit is disposed in the middle of the first radiation electrode. Notches may be disposed between the first radiation electrode and a second radiation electrode and between the first radiation electrode and a third radiation electrode. | 11-05-2009 |
20090303144 | ANTENNA STRUCTURE AND WIRELESS COMMUNICATION DEVICE INCLUDING THE SAME - A capacitive-power-feeding-type radiating electrode is provided on a dielectric substrate, and the dielectric substrate is provided in a non-ground region of a circuit board. In the non-ground region of the circuit board, a ground line electrically connecting the radiating electrode with a ground electrode of the circuit board is provided. The ground line is shaped so as to have at least one turnback portion. On the ground line, a resonant-frequency adjusting element is arranged so as to shortcut a portion of the ground line. The resonant-frequency adjusting element has a capacitance or inductance so as to adjust a resonant frequency of an antenna structure to a predetermined resonant frequency. | 12-10-2009 |
20100194654 | ANTENNA STRUCTURE WITH AN EFFECT OF CAPACITANCE IN SERIAL CONNECTING - In an antenna structure having an effect of capacitance in serial connecting, mainly a metallic planar antenna is provided thereon at least with a first metallic plane board, and a second metallic plane board being close to but not connected to the first metallic plane board to form the effect of capacitance in serial connecting. And more, the antenna structure further has an extension arm made from a microstrip extended from the antenna or the second metallic plane board, and can be optionally grounded or not grounded, for the purpose of adjusting the impedance value of the antenna structure. | 08-05-2010 |
20100245195 | TUNABLE INVERTED F ANTENNA - A planar antenna includes a ground plane on a substrate, a radiating element coupled to the ground plane on the substrate, and a feed line. An impedance tap point is defined by a connection between the feed line and the radiating element and the length of the radiating element defines the resonant frequency of the antenna. A first portion of the radiating element includes an impedance adjustment mechanism for defining the impedance tap point of the antenna and consequently the impedance of the antenna. A second portion of the radiating element includes a frequency adjustment section which adjusts the length of said radiating element and consequently the resonant frequency of the antenna. | 09-30-2010 |
20100289711 | PORTABLE WIRELESS DEVICE - A method of offsetting a mismatch due to user interaction when handling a portable wireless terminal in which antenna matching is changed from inductive matching to capacitive matching in response to a reactance change exceeding a threshold level and vice versa when an opposite change is detected. An antenna interface module ( | 11-18-2010 |
20110221643 | ADJUSTABLE INTEGRATED CIRCUIT ANTENNA STRUCTURE - An adjustable integrated circuit antenna structure includes an antenna, a ground plane, a plurality of transmission line circuit elements and a coupling circuit. The coupling circuit is operable to couple at least one of the plurality of transmission line circuit elements into a transmission line circuit based on a transmission line characteristic signal. The transmission line circuit has at least one of a bandwidth, an impedance, a quality factor, and a frequency band in accordance with the transmission line circuit characteristic signal. | 09-15-2011 |
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 |
20110267246 | MULTI-FREQUENCY ANTENNA - A multi-frequency antenna ( | 11-03-2011 |
20120146865 | FREQUENCY-VARIABLE ANTENNA CIRCUIT, ANTENNA DEVICE CONSTITUTING IT, AND WIRELESS COMMUNICATIONS APPARATUS COMPRISING IT - An antenna device comprising an antenna element disposed on a mounting board separate from a main circuit board, a coupling means disposed on the mounting board such that it is electromagnetically coupled to the antenna element, and a frequency-adjusting means disposed on the mounting board such that it is connected to the coupling means, the antenna element comprising first and second strip-shaped antenna elements integrally connected for sharing a feeding point, the second antenna element being shorter than the first antenna element; the coupling means being formed on a dielectric chip attached to the mounting board, and having a coupling electrode electromagnetically coupled to part of the first antenna element. The frequency-adjusting means comprises a parallel resonance circuit comprising a variable capacitance circuit and a first inductance element, and a second inductance element series-connected to the parallel resonance circuit. | 06-14-2012 |
20120249387 | DISTRIBUTED REACTANCE ANTENNA - An antenna including a capacitive element and an inductive element having first and second ends, the first end of the inductive element being galvanically connected both to a feed point and to the capacitive element at a first connection point, the second end of the inductive element being galvanically connected to the capacitive element at a second connection point, the second connection point being spatially displaced from the first connection point, wherein electrical signals at the first and second connection points are mutually out of phase. | 10-04-2012 |
20130057442 | Multi-Layered Multi-band Antenna - Embodiments provide multi-band, compound loop antennas (multi-band antennas). Embodiments of the multi-band antennas produce signals at two or more frequency bands, with the two or more frequency bands capable of being adjusted and tuned independently of each other. Embodiments of a multi-band antenna are comprised of at least one electric field radiator and at least one monopole formed out of the magnetic loop. At a particular frequency, the at least one electric field radiator in combination with various portions of the magnetic loop resonate and radiate an electric field at a first frequency band. At yet another particular frequency, the at least one monopole in combination with various portions of the magnetic loop resonate and radiate an electric field at a second frequency band. The shape of the magnetic loop can be tuned to increase the radiation efficiency at particular frequency bands and enable the multi-band operation of antenna embodiments. | 03-07-2013 |
20130147674 | ANTENNA DEVICE, ANTENNA MODULE, AND PORTABLE TERMINAL - Radiation electrodes are formed on a dielectric base body of an antenna chip. A capacitive feeding electrode is formed on a first end surface of the dielectric base body. A ground electrode, a feeding circuit connection electrode, feeding lines, a tip electrode, and the like are formed on the top surface of a base member of a substrate. When a first switching element selects the feeding line side, a second switching element is made to enter a conducting state. In this state, the radiation electrodes are capacitively fed. When the first switching element selects the feeding line side, the second switching element is made to enter an open state. In this state, the radiation electrodes are directly fed. In this manner, the directivity direction of an antenna can be switched using a single radiation element. | 06-13-2013 |
20130201068 | Programmable antenna having a programmable substrate - An antenna circuit includes a substrate, an antenna, and a projected artificial magnetic minor (PAMM). The antenna is fabricated on the substrate and is positioned in a region of the substrate that has a high permittivity. The PAMM produces an artificial magnetic conductor at a distance above a surface of the substrate to facilitate a radiation pattern for the antenna. | 08-08-2013 |
20130214979 | Electronic Device Antennas with Filter and Tuning Circuitry - An electronic device may have an antenna that includes conductive antenna structures forming an antenna resonating element and an antenna ground. A band-stop filter may be coupled between first and second portions of the conductive structures. The band-stop filter may be formed from multiple series-connected resonant circuits. The band-stop filter and an impedance matching circuit may be coupled in series between the antenna resonating element and the antenna ground. The band-stop filter may be characterized by a stop band. The antenna may be configured to operate in a first communications band that is outside of the stop band and a second communications band that is covered by the stop band. The impedance matching circuit may be an adjustable circuit that is used to tune the antenna. The adjustable circuit may be a switch-based adjustable capacitor that is adjusted to tune the response of the antenna in the first communications band. | 08-22-2013 |
20130234903 | BUILT-IN ANTENNA FOR ELECTRONIC DEVICE - A built-in antenna apparatus for a electronic device is provided. The antenna apparatus comprises a PCB with conductive and non-conductive areas. An antenna radiator is disposed at the non-conductive area of the PCB; the antenna radiator has a feeding portion and at least a first radiating portion configured in a first pattern branched from the feeding portion and has an end portion electrically connected to the conductive area. At least one capacitor is electrically connected in series within the first radiating portion. A resonant frequency of the first radiating portion is a function of a capacitance value of the at least one capacitor. The antenna can be provided in a smaller size for a given frequency band due to the capacitance. A second antenna radiator branched from the feeding portion can also be provided for operation at a different frequency band. | 09-12-2013 |
20130300619 | METHOD AND APPARATUS FOR GENERATING DEDICATED DATA CHANNELS IN BACKSCATTER RFID SYSTEMS USING BAND-PASS MODULATION - An antenna apparatus for backscattering an incoming radio frequency (RF) signal includes an antenna for backscattering the incoming RF signal in accordance with a reflection coefficient characteristic of the antenna. A variable impedance circuit includes an output electrically connected to the antenna. A band-pass delta sigma modulator is coupled to the variable impedance circuit and digitally controls the output of the variable impedance circuit, such that the reflection coefficient of the antenna is adjusted based on the digitally controlled output of the variable impedance circuit. In an RFID network, the apparatus and method reduces the effect of DC offset in the reader device and the effects of the reader device's phase noise, while allowing for complex modulations. | 11-14-2013 |
20140015723 | BROADBAND VARIABLE ANTENNA DEVICE AND PORTABLE TERMINAL HAVING THE SAME - Disclosed is an antenna device for a portable terminal, including a circuit board having a conductive layer attached on a surface, a first slit formed by partially removing the conductive layer in a position adjacent to one side of the circuit board, the first slit extending in parallel with a lateral periphery of the circuit board, a radiation portion comprising part of the conductive layer positioned on the lateral periphery of the circuit board in one side of the first slit, and a feed line placed on the first slit and adapted to feed the radiation portion from the other side of the first slit. The radiation portion further comprises a second slit extending from the first slit to the lateral periphery of the circuit board across part of the conductive layer forming the radiation portion, and a frequency adjustment element placed on the second slit. | 01-16-2014 |
20140097994 | COMMUNICATION DEVICE AND TUNABLE ANTENNA ELEMENT THEREIN - A communication device includes a ground element and an antenna element. The antenna element includes a first radiation element, a second radiation element, and a control circuit. One end of the first radiation element is coupled to a signal source, and another end of the first radiation element is an open end. The second radiation element includes at least a first portion and a second portion. A first end of the first portion is a shorted end coupled to the ground element, and a fourth end of the second portion is an open end. The second radiation element surrounds the open end of the first radiation element. The control circuit is coupled between a second end of the first portion and a third end of the second portion of the second radiation element. The control circuit provides at least two different impedances. | 04-10-2014 |
20140145892 | PORTABLE COMMUNICATION DEVICE AND ADJUSTABLE ANTENNA THEREOF - A portable communication device and an adjustable antenna thereof are disclosed herein. The portable communication device includes a substrate, the adjustable antenna and a control circuit. The adjustable antenna includes an antenna body, an adjusting element, a feeding terminal and a ground terminal. The antenna body has multiple conductive portions and is disposed above the substrate. The adjusting element is coupled between the conductive portions. The feeding terminal and the ground terminal extend from the antenna body and are coupled to the substrate. The control circuit feeds a first control signal and a second control signal respectively through the feeding terminal and the ground terminal to the adjusting element, so as to adjust an electrical length of the adjustable antenna. | 05-29-2014 |
20140306857 | Antenna System With Return Path Tuning And Loop Element - Electronic devices may include radio-frequency transceiver circuitry and antenna structures. The antenna structures may include a dual arm inverted-F antenna resonating element and an antenna ground. An antenna feed may be coupled between the inverted-F antenna resonating element and the antenna ground. An adjustable component such as an adjustable inductor may be coupled between the inverted-F antenna resonating element and the antenna ground in parallel with the antenna feed. The adjustable component may be operable in multiple states such as an open circuit state, a short circuit state, and a state in which the adjustable component exhibits a non-zero inductance. Antenna bandwidth can be broadened by coupling a loop antenna resonating element across the antenna feed. A portion of the antenna ground may overlap the loop antenna resonating element to further enhance antenna bandwidth. | 10-16-2014 |
20140306858 | BROADBAND ANTENNA AND AN ANTENNA ASSEMBLY - A broadband antenna includes a grounding plane, a radiation unit which has first and second radiation components disposed adjacent to the grounding plane, and an impedance adjusting unit which is operable to adjust an impedance upon receipt of and according to a control signal. A length of a resonance path of the antenna is equal to an overall electrical length of from the first radiation component, the impedance adjusting unit, to the second terminal. | 10-16-2014 |
20140340270 | WIRELESS COMMUNICATION DEVICE - A wireless communication device includes a cover, an antenna, and an adjusting member. The adjusting member is slidably mounted to the cover and is made of non-conductive materials. The antenna includes a extending portion, the extending portion is sandwiched between the cover and the adjusting member. The adjusting member contacts and partially overlaps with the extending portion, the adjusting member slides relative to the cover to change contact positions of the extending portion and the adjusting member. | 11-20-2014 |
20140354495 | TUNABLE MULTIBAND WAN ANTENNA FOR GLOBAL APPLICATIONS - An electronic device includes an antenna for a transceiver to operate in a plurality of frequencies. The antenna includes a first portion that is coupled to an elongate element and is configured to enable the transceiver to operate in a first low-band frequency and a first high-band frequency. A second portion is also coupled to the elongate element. The second portion is configured to enable the transceiver to operate in a second high-band frequency. A third portion is coupled to the elongate element and is situated between the first and second portions. The third portion is configured to tune the first and the second high-band frequencies associated with the first and second portions. A tuning element is configured to tune the low-band frequency associated with the first portion such that the first and the second high-band frequencies are not significantly affected by tuning the tuning element. | 12-04-2014 |
20140368392 | RECONFIGURABLE ANTENNA STRUCTURE - The present invention refers to a reconfigurable antenna structure. The antenna structure comprises a radiating structure comprising one or more first radiating elements and a secondary radiating structure, operationally associated with said primary radiating structure. Said secondary radiating structure comprises a plurality of second radiating elements that can be selectively electrically connected/disconnected to each other to vary the configuration of said secondary radiating structure, so as to vary the radiating properties of the antenna structure. The antenna structure also comprises first reactive loads, electrically connected between said primary and secondary radiating structures, and second reactive loads, electrically connected to said secondary radiating structure. Said first reactive loads, said second reactive loads and said second radiating elements forming one or more circuitry structures that are electrically resonant in the operating frequency band of said antenna structure and that are electrically connected/disconnected to each other in a selective manner in accordance to the configuration selected for said second radiating structure, thereby maintaining constantly equal to zero the overall reactive load that is electrically connected to said primary radiating structure. | 12-18-2014 |
20150054700 | ANTENNA ARRAY - This antenna array includes at least one primary antenna, at least one secondary antenna and at least one load coupled to a secondary antenna. The load includes two separate components, a first component being a resistor and a second component being selected from an inductor or a capacitor. The antenna array can include one or more of the following characteristic features, taken into consideration individually or in accordance with any technically possible combinations: the first component has negative resistance; the second component has negative inductance or a negative capacitance; at least one load has an adjustable impedance. The antenna array may be used in a system, such as a vehicle, a terminal, a mobile telephone, a wireless network access point, a base station, or a radio frequency excitation probe. | 02-26-2015 |
20150054701 | ELECTRONIC DEVICE AND METHOD OF OPERATING THE SAME - An electronic device including a processor and an antenna device is provided. The antenna device includes a power feeding unit, a first radiation section connected to the power feeding unit, and a switching element including a first terminal electrically connected to first portion of the first radiation section, and a second terminal electrically connected to a second portion of the first radiation section. The processor uses a first resonance frequency band when the switching element is opened and uses a second resonance frequency which is different from the first when the switching element is closed. | 02-26-2015 |
20150091766 | BROADBAND CAPACITIVELY-LOADED TUNABLE ANTENNA - A broadband capacitively-loaded tunable antenna, and device there for is provided. The device comprises: an antenna feed; a first radiating arm connected to the antenna feed; a second radiating arm capacitively coupled to the first radiating arm; an adjustable reactance device connecting the second radiating arm to one or more of a ground and a third radiating arm; and, a processor in communication with the adjustable reactance device, the processor configured to adjust a reactance of the adjustable reactance device to tune a resonance frequency of a combination of the second radiating arm, the adjustable reactance device, and, when present, the third radiating arm. | 04-02-2015 |
20150097742 | Tunable Serpentine Antenna Assembly - An antenna assembly is mountable to a craft. The craft has a power source. The antenna assembly includes a base securable to the craft. A monopole post extends out from the base. A plurality of voltage lines extend through the base and the monopole post. The antenna assembly also includes a plurality of capacitors operatively connected to the monopole post. Each of the capacitors is electrically connected to each of the plurality of voltage lines. The plurality of capacitors extend through serpentine paths distributing electrical charge across the plurality of capacitors to vary reactance properties of the antenna assembly. | 04-09-2015 |
20150109176 | ANTENNA CIRCUIT AND A METHOD OF OPTIMISATION THEREOF - An antenna circuit is having an impedance circuit which can cancel signal leakage from the input port into the isolation port of a directional coupler. The antenna circuit further comprises a second impedance circuit for optimising power transfer from the input port to the output port of the directional coupler. Furthermore, the antenna is tunable in order to maximize the reception strength of the antenna. The antenna circuit provides at once the possibility of tuning the antenna strength, optimising the power transmission and reducing signal jamming by cancelling signal leakage. The antenna finds use as an effective and miniature RFID antenna. | 04-23-2015 |
20150318618 | SURFACE SCATTERING ANTENNAS WITH LUMPED ELEMENTS - Surface scattering antennas with lumped elements provide adjustable radiation fields by adjustably coupling scattering elements along a wave-propagating structure. In some approaches, the surface scattering antenna is a multi-layer printed circuit board assembly, and the lumped elements are surface-mount components placed on an upper surface of the printed circuit board assembly. In some approaches, the scattering elements are adjusted by adjusting bias voltages for the lumped elements. In some approaches, the lumped elements include diodes or transistors. | 11-05-2015 |
20160020051 | PACKAGE MEMS SWITCH AND METHOD - An electronic device and methods including a switch formed in a chip package are shown. An electronic device and methods including a switch formed in a polymer based dielectric are shown. Examples of switches shown include microelectromechanical system (MEMS) structures, such as cantilever switches and/or shunt switches. | 01-21-2016 |
20160043468 | ANTENNA DEVICE - A variable resonant circuit is inserted between a feeding point of a radiating element and a ground conductor. When the variable resonant circuit is not inserted, an input impedance of the radiating element is lower than about 50Ω and capacitive in a first low frequency band, lower than about 50Ω and inductive in a second low frequency band, and close to about 50Ω in a high frequency band. When the variable resonant circuit exhibits a first resonance characteristic, the variable resonant circuit is inductive in the first low frequency band, and its impedance in the high frequency band is higher than that in the first low frequency band. When the variable resonant circuit exhibits a second resonance characteristic, the variable resonant circuit is capacitive in the second low frequency band, and its impedance in the high frequency band is higher than that in the second low frequency band. | 02-11-2016 |
20160079656 | MOBILE DEVICE AND MANUFACTURING METHOD THEREOF - A mobile device includes a ground element, a radiation element, a first short-circuited element, a second short-circuited element, and a switch element. The radiation element has a feeding point, a fixed grounding point, and a switchable grounding point. The fixed grounding point is coupled through the first short-circuited element to the ground element. The switchable grounding point is coupled through the second short-circuited element and the switch element to the ground element. An antenna structure is formed by the radiation element, the first short-circuited element, the second short-circuited element, and the switch element. | 03-17-2016 |
20160141762 | Antenna - Disclosed is an antenna, the antenna includes a metal trace, an antenna feeder, and a power connector set on a printed circuit board (PCB), wherein the metal trance and the antenna feeder are connected at a feed point, the antenna is configured with a reactive element on one surface of the PCB board which is opposite to or the same with the surface where the feed point is located; and when a radio frequency signal of the antenna is at a low frequency, the reactive element is conducted, and when a radio frequency signal of the antenna is at a high frequency, the reactive element is disconnected, or when a radio frequency signal of the antenna is at a low frequency, the reactive element is disconnected, and when a radio frequency signal of the antenna is at a high frequency, a control switch of the reactive element is conducted. | 05-19-2016 |
20160149317 | Communication Apparatus With Improved Radiated Spurious Emission And Loss - Examples of a tunable antenna and various implementations thereof are described. The tunable antenna may include a radiator and one or more varactors. The radiator may include at least one feeding port and at least one shorting port. Each of the one or more varactors may be coupled to the radiator and configured to operate in either an isolation state or a connection state when the tunable antenna operates in a radio-frequency (RF) frequency range. | 05-26-2016 |
20160190690 | MULTIBAND SLOT ANTENNA SYSTEM AND APPARATUS - An apparatus comprises an antenna ground plane; a conductive side element, a first antenna resonating element; a second antenna resonating element; and a slot-based antenna element formed from slot structures between the conductive side element and the conductive housing element. At least two RF switches are loaded with lump loads, located across the slot-based antenna element and dividing the slot-based antenna element to sections. A first antenna resonating element capacitively coupled to the slot-based antenna element, and forming a first antenna operating at a first frequency; the second antenna resonating element capacitively coupled to the slot-based antenna element, and forming a second antenna operating at a second frequency; and wherein the first and the second frequency are configured to be tuned at different frequencies based on a lump load switched by the first and the second RF switches. | 06-30-2016 |
20160204808 | METHODS AND APPARATUS FOR PERFORMING IMPEDANCE MATCHING | 07-14-2016 |