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| Number | Title | Issue Date |
| 8174460 | Variable antenna matching network for an implantable antenna An implantable medical device can include an implantable antenna for communication with external devices or other internal devices. Changes in the patient's body position, weight, composition or other factors may change the efficiency of the implantable antenna and ... | 05/08/2012 |
| 8159408 | Method and system for software defined antenna control Methods and systems for reducing AM/PM and AM/AM distortion are disclosed and may comprise selectively coupling and impedance matching one of a plurality of tunable antennas to a single programmable output stage comprising a single power amplifier in a transmitter. ... | 04/17/2012 |
| 8098210 | Antenna matching in video receivers A method of matching a receive-only antenna (60) for use in receiving video signals in which measurements made on a transceiver's antenna (14) when in an transmitting mode are used in matching the receive-only antenna. The ratio of the amplitude of the... | 01/17/2012 |
| 8059058 | Antenna system and method for operating an antenna system An antenna system is disclosed that includes two or more antennas and an impedance matching network. The antennas of the antenna system are closely separated, such as by a distance of no more than a wavelength of received signals divided by two. The impedance matchi... | 11/15/2011 |
| 7944403 | RF reception system and integrated circuit with programmable impedance matching network and methods for use therewith An integrated circuit includes an on-chip antenna interface, coupled to an off-chip antenna interface having at least one off-chip impedance matching component, that forms a programmable impedance matching network with the at least one off-chip impedance matching co... | 05/17/2011 |
| 7864133 | Method and system for software defined antenna control Methods and systems for reducing AM/PM and AM/AM distortion are disclosed and may comprise selectively coupling and impedance matching one of a plurality of tunable antennas to a single programmable output stage comprising a single power amplifier on a chip in a tra... | 01/04/2011 |
| 7746291 | RF reception system and integrated circuit with programmable impedance matching network and methods for use therewith An integrated circuit includes an on-chip antenna interface, coupled to an off-chip antenna interface having at least one off-chip impedance matching component, that forms a programmable impedance matching network with the at least one off-chip impedance matching co... | 06/29/2010 |
| 7379714 | Method and apparatus for dynamically adjusting a transmitter's impedance A method and apparatus for dynamically adjusting the impedance between a transmitter's power amplifier (PA) and antenna to efficiently transfer power from the PA to the antenna. The impedance between the PA and the antenna is adjusted based on power level measuremen... | 05/27/2008 |
| 7348926 | Cellular phone and method of operating the same A cellular phone covering a plurality of frequency bands, includes (a) an antenna, (b) a high-frequency circuit, (c) an antenna-matching circuit electrically connecting in series between the antenna and the high-frequency circuit, and (d) a first unit which varies a... | 03/25/2008 |
| 7336238 | Shaped ground plane for dynamically reconfigurable aperture coupled antenna Method for controlling an input impedance of an antenna (100). The method can include the steps of coupling RF energy from an input RF transmission line (106) to an antenna radiating element (102) through an aperture (112) defined in a gr... | 02/26/2008 |
| 7317303 | Rectified power supply A power supply creates a voltage difference between high and low power supply rails. The power supply has a voltage signal source, a capacitive coupling element, energy storage element 12, first and second rectifying diodes, a regulator, and bypass means for ... | 01/08/2008 |
| 7242364 | Dual-resonant antenna A wide-band antenna comprises a series-resonant antenna and a resonant circuit. The antenna has a radiative element and a feed pin. The resonant circuit comprises an inductive element connected to the feed pin and a capacitor connected in parallel to the inductive e... | 07/10/2007 |
| 7190933 | Method and apparatus for automatic tuning of a resonant loop antenna in a transceiver circuit Disclosed is a circuit and method for automatic tuning of a resonant circuit in a transceiver having a receiver and a transmitter that includes a power amplifier for driving the resonant circuit. During a transmit mode of the transceiver, a resonance voltage of the ... | 03/13/2007 |
| 7180467 | System and method for dual-band antenna matching A dual-band antenna matching system and a method for dual-band impedance matching are provided. The method comprises: accepting a frequency-dependent impedance from an antenna; and, selectively supplying a conjugate impedance match for the antenna at either a first ... | 02/20/2007 |
| 7176845 | System and method for impedance matching an antenna to sub-bands in a communication band A sub-band antenna matching method and an antenna matching system for selectively matching a communication bandwidth segment impedance have been provided. The method comprises: accepting a frequency-dependent impedance from an antenna; and, selectively supplying a c... | 02/13/2007 |
| 7174142 | Receiver having a built-in antenna and method of impedance-matching for the same A receiver includes an antenna, an impedance-matching circuit, a receive circuit, a control circuit, a digital-to-analog (D/A) converter, a mode switch, and an EEPROM. The impedance-matching circuit includes a variable-capacitance diode. The control circuit determin... | 02/06/2007 |
| 7142811 | Wireless communication over a transducer device One aspect of the present invention is generally directed towards a system and method of tuning a transducer for transmitting and receiving a wireless signal. In an illustrative embodiment, a single transducer is coupled to a first or second circuit for either trans... | 11/28/2006 |
| 7116281 | Universal dipole with adjustable length antenna elements Described is a universal dipole which may include a feed line coupled to a first fitting; a balun coupled to a second fitting; a first variable length antenna element coupled to the first fitting; a second variable length antenna element coupled to the second fittin... | 10/03/2006 |
| 7113095 | Trackable files and systems for using the same A system for tracking files at a site having a plurality of locations includes a plurality of antenna arrays and a plurality of files. Each of the antenna arrays generates an energizing field and is disposed at or near one of the locations. Each of the files include... | 09/26/2006 |
| 7113087 | Proximity sensing based on antenna impedance variation Proximity of a user body part can be detected by measuring the effects such proximity has on antenna impedance mismatches. The amount of mismatch affects the amount of RF signal energy reflected back into a transmission line connecting the antenna to a RF signal sou... | 09/26/2006 |
| 7109944 | Antenna using variable capacitance element and wireless communication apparatus using the same An antenna is constituted in which a variable capacitance capacitor portion Ct is connected between an antenna element and a ground. In the variable capacitance capacitor, a plurality of variable capacitance elements using a thin film dielectric layer whose dielectr... | 09/19/2006 |
| 7109945 | Flat antenna, antenna unit and broadcast reception terminal apparatus There is provided a flat antenna that includes a feed conductor, and at least one non-feed conductor positioned on either one side or both sides of the feed conductor depending on the required reception band. Thus, a flat antenna that is capable of receiving televis... | 09/19/2006 |
| 7071776 | Systems and methods for controlling output power in a communication device A mismatch detector including a directional device adapted to couple signals across the device and a detector coupled to a port on the directional device and configured to measure a reflected power a second detector coupled to a port on the directional device and co... | 07/04/2006 |
| 7058372 | Method and apparatus for automatic tuning of a resonant loop antenna Disclosed is a circuit and method for continuous automatic tuning of a resonant circuit. A resonance voltage of the resonant circuit is phase shifted by a predetermined phase shift Φ degrees and an input voltage signal to a power amplifier driving the resonant circ... | 06/06/2006 |
| 6993297 | Apparatus and methods for tuning antenna impedance using transmitter and receiver parameters According to some embodiments of the present invention, an impedance transformation circuit is provided for use with a transmitter, a receiver, and an antenna. The transmitter may provide transmission signals for transmission by the antenna. The antenna may provide ... | 01/31/2006 |
| 6972720 | Antenna device capable of adjusting frequency An antenna device includes a ground conductor plate, and a radiating conductor plate made of a metal plate, which is spaced from the ground conductor plate. The radiating conductor plate is provided with adjusting means for adjusting the electrical length. Thus, the... | 12/06/2005 |
| 6870460 | Input impedance arrangement for RF transponder A transponder 14.1 for a radio frequency (RF) identification system comprises an antenna 22.1 having an antenna impedance (ZA) having a real part (RA) connected to transponder circuitry presenting a load impedance (ZL) ... | 03/22/2005 |
| 6721544 | Duplexer structure for coupling a transmitter and a receiver to a common antenna A duplexer structure for allowing an RF transmitter and an RF receiver to share a common antenna includes impedance matching circuitry to match the receiver input impedance to the antenna impedance during a receive operation and impedance transformation circuitry to... | 04/13/2004 |
| 6718157 | Apparatus for commonly using antenna for call signal and television broadcasting signal in radio communication terminal Disclosed is an apparatus for commonly using an antenna for a call signal and a television (TV) broadcasting signal in a radio communication terminal including an antenna, a phone duplexer, a TV tuner, an LC parallel circuit, connected between the antenna and the ph... | 04/06/2004 |
| 6469590 | Marine antenna with an integral filter An antenna (24) for minimizing reception of undesirable signals below a predetermined frequency band includes a first and a second terminal (A, A') connectable to at least a receiver (22). The antenna components are connected to the first and second termi... | 10/22/2002 |
| 6429828 | VHF/UHF self-tuning planar antenna system A wide-band self-tuning antenna system for the reception of VHF/UHF signals includes planar antenna elements located on both the surfaces of a printed circuit board and a tuner unit which includes a plurality of matching networks for the respective plural... | 08/06/2002 |
| 6417811 | In-glass antenna element matching An in-glass antenna system for a window with adjustable impedance for impedance matching. The in-glass antenna system includes an in-glass slot antenna that is defined by an upper portion, a lower portion and two respective side portions. An in-glass impe... | 07/09/2002 |
| 6218994 | Small antennas for communication over sea ice The invention described herein relates to an antenna system which makes use of the waveguide properties of sea ice. The antenna system broadly includes at least one antenna wire extending along and preferably in contact with a sea ice surface for transmit... | 04/17/2001 |
| 5999134 | Glass antenna system with an impedance matching network The present invention provides a glass antenna system with improved reception, a connector of the glass antenna system and a method of producing the glass antenna system. The glass antenna system includes a glass substrate, at least one electroconductive ... | 12/07/1999 |
| 5986617 | Multiband antenna matching unit An unbalanced to balanced antenna matching unit (AMU) is capable of operating over a relatively large frequency range by utilizing multiple transformers connected in series, with a set of bypass switches used to control the number of transformers that are... | 11/16/1999 |
| 5883600 | Tuneable antenna A tuneable antenna including an elongated radiating element with a conductive loading coil positioned on an insulating member. A capacitor is formed above the loading coil with a conductive member overlying the loading coil and movable with respect to the... | 03/16/1999 |
| 5874926 | Matching circuit and antenna apparatus A matching circuit and an antenna apparatus which, though small-sized, can be used in a radio apparatus which transmits and receives radio waves having a wide range of frequencies. A matching circuit includes an inductance element formed of a chip inducto... | 02/23/1999 |
| 5751253 | Antenna coupling system A new and improved antenna-transmission line coupling system is provided wherein the electro-magnetic oscillations in the antenna are prevented from entering the circuitry which couples the antenna to its transmission line. The coupling structure (called ... | 05/12/1998 |
| 5631611 | Automatic matching and tuning network The present invention relates to a matching and tuning network for connecting a source of RF power to a complex load. The network is comprised of a primary circuit and a secondary circuit. The primary circuit is comprised of a fixed capacitor connected in... | 05/20/1997 |
| 5589844 | Automatic antenna tuner for low-cost mobile radio An automatic antenna tuner which conjugately matches the impedance of an electrically small antenna to the impedance of a transmit amplifier output stage by using a pi-type impedance matching network with adjustable capacitive circuit components which are... | 12/31/1996 |
