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...Daniel Webster invented a "bull plow" to pull out tree stumps. It didn't catch on because it was huge and required four oxen to pull it!
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| Number | Title | Issue Date |
| 7336239 | Small multi-mode antenna and RF module using the same A small multi-mode antenna in which a single feeding point can be used commonly for multiple frequencies and an RF module using such antenna for use in less-costly and small multimedia wireless apparatus is provided. The antenna is configured such that a single feed... | 02/26/2008 |
| 7313413 | Radio frequency receiving apparatus and method of mobile communication terminal An RF (Radio Frequency) receiving apparatus and method of a mobile communication terminal are disclosed to perform a GPS signal receiving function for a position tracking service while minimizing interference from a telecommunication signal. The RF receiving apparat... | 12/25/2007 |
| 7263072 | System and method for selecting a communication band A system and method for making a band selection in a wireless communications device is provided. The available bands include a first-communication band, a second communication band, and an auxiliary band. A wideband diplexer provides a wideband path, which includes ... | 08/28/2007 |
| 7181171 | System and method for providing auxiliary reception in a wireless communications system A system and method for providing auxiliary reception in a wireless communications system includes a wireless communications device. The wireless communications device includes a first antenna and a second antenna. The wireless communications device can, for example... | 02/20/2007 |
| 7155184 | Triple band receiving apparatus for a mobile communication terminal A triple band receiving terminal of a mobile communication system operates in three bands by installing an impedance matching unit and a band selection switching unit at the exterior of a dual band RF receiver. The triple band receiving terminal includes three filte... | 12/26/2006 |
| 7126440 | Modular frequency division filter The present invention is a modular frequency division filter having an antenna port that connects to two or three transmission paths. Each transmission path includes either a band pass filter or a duplexer to separate the received signal by frequency. Frequency phas... | 10/24/2006 |
| 7116937 | Electric appliance Electric appliance, in particular in the form of an automotive radio, having a control element (4) for manual control of the electric appliance by a user, and a transmission unit (5) for wireless transmission of data from and/or to the electric applian... | 10/03/2006 |
| 7088307 | Antenna matching circuit, mobile communication device including antenna matching circuit, and dielectric antenna including antenna matching circuit In an antenna matching circuit including a parallel resonant section connected to a radiation element constituting an antenna, the parallel resonant section includes a series resonant portion composed of an inductance component and a capacitance component. The serie... | 08/08/2006 |
| 6980067 | Triplexer systems and methods for use in wireless communications device A wireless communication device is configured for tri-band communication. One of the bands can be for GPS operation. The wireless communication device can comprise an antenna configured to transmit and receive communication signals over two communication bands and t... | 12/27/2005 |
| 6950410 | Frequency multiplexer Multiple circuits connected to a common terminal are switched where the frequency bands to be conducted through the circuits are close. Each circuit has an independent signal path to the common terminal which contains a filter and a device. Each device has a first a... | 09/27/2005 |
| 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 |
| 6667723 | System and method for a GPS enabled antenna A system and a method for providing a global positioning system (GPS) enabled antenna system are provided. The GPS enabled antenna may be used, for example, on a wireless communications device such as a wireless handset. The wireless communications device... | 12/23/2003 |
| 6515557 | Isolating signal divider/combiner and method of combining signals of first and second frequencies A signal divider/combiner (11) and method combines first and second frequency signals received by microstrip patch antennas (58, 48). A first transmission line stub (28) blocks the second frequency signals on the first signal receiving path, and a second ... | 02/04/2003 |
| 6489843 | Power amplifier and communication unit A power amplifier including: a first amplifier PA2 having an input terminal and an output terminal; a passive circuit PC3 having an input terminal and an output terminal; and a first switch SW2 having a single-pole terminal and two multi-throw terminals, ... | 12/03/2002 |
| 6466180 | Multiple stub tuner for disguised vehicle antenna A matching network for coupling an OEM vehicle antenna to communications equipment operating at two different frequencies without any physical modification of the antenna mast and base. The network comprises a first transmission line section connected at ... | 10/15/2002 |
| 6307525 | Multiband flat panel antenna providing automatic routing between a plurality of antenna elements and an input/output port A transmit/receive antenna selectively operates to transmit or receive at one or more of a plurality of different frequencies in the MHz range. A planar transmission line diplexer or multiplexer that is selected from the group microstrip multiplexer diple... | 10/23/2001 |
| 6150983 | Device for receiving and/or transmitting electromagnetic radiation A device for receiving and/or transmitting an electromagnetic oscillation is described utilizing an antenna element and at least two wave-guiding assemblies which are each connected to a connection point of the antenna element via a respective supply devi... | 11/21/2000 |
| 6078299 | Multi-phase coupler with a noise reduction circuit A multi-phase coupler including a noise reduction circuit which provides two output signals which are separately shifted in phase with respect to an input radio frequency (RF) signal. The input RF signal is capacitively phase-shifted to lead the phase of ... | 06/20/2000 |
| 5986616 | Antenna system for circularly polarized radio waves including antenna means and interface network An antenna system for a radio communication device, in particular a hand-portable telephone, having communication circuits and to be operating by circularly-polarized radio waves. In the system (1) there is provided a radiation means, preferably helical e... | 11/16/1999 |
| 5861851 | Mobile-phone antenna device directly insertion connectable to an external antenna A mobile-phone antenna device capable of insertion connecting directly to an external antenna, wherein, on the bottom of the exposed portion of the body of a fixed antenna thre is provided with an enlarged base of suitable size with one side thereof being... | 01/19/1999 |
| 5805113 | Multiband antenna receiver system with, LNA, AMP, combiner, voltage regulator, splitter, noise filter and common single feeder An antenna unit and a receiver having such an antenna are disclosed. The antenna includes an antenna body; a first antenna provided on the antenna body for receiving signals transmitted from satellites; at least one second antenna provided on the antenna ... | 09/08/1998 |
| 5771026 | Disguised broadband antenna system for vehicles A disguised broadband antenna system for use with a broadcast radio receiver and communications apparatus in a vehicle wherein the antenna system comprises a standard broadcast antenna mounted to the vehicle by means of a base, a distributed matching netw... | 06/23/1998 |
| 5734352 | Multiband antenna system An AM/FM/CB/cellular telephone antenna includes a first frequency self-resonant circuit at a position above the lower end of the antenna such that the electrical length of the lower section of the antenna is equivalent to one-quarter wavelength for a freq... | 03/31/1998 |
| 5668558 | Apparatus capable of receiving circularly polarized signals An apparatus capable of receiving right-handed and left-handed circularly polarized signals for use in a parabolic reflector antenna comprises a first dielectric plate with a square shape, a square patch antenna prepared in a center of the first dielectri... | 09/16/1997 |
| 5652599 | Dual-band antenna system A dual-band antenna system for use in a portable communications device is disclosed herein. The antenna system includes an antenna element for radiating electromagnetic energy within low-band and high-band wavelength ranges. In a preferred embodiment, a l... | 07/29/1997 |
| 5600335 | High-power broadband antenna A high-power broadband antenna comprises an impedance matching transformer electrically coupled to a radio frequency source generating an input signal having a base wavelength corresponding to the lowest frequency of the input signal. The impedance transf... | 02/04/1997 |
| 5541615 | 3 band communication equipment A three band antenna unit for reception of radio waves in the AM and FM bands and for reception and transmission of radio waves in the UHF band as well as its connection with filters and a communication equipment are disclosed. The antenna unit includes a... | 07/30/1996 |
| 5541617 | Monolithic quadrifilar helix antenna A quadrifilar helix antenna containing a hybrid junction power divider feed circuit and a plurality of radiating elements. The radiating elements are connected on one end to the hybrid junction power divider feed circuit and are free to radiate on the oth... | 07/30/1996 |
| 5379455 | Modular distributed antenna system A distributed antenna system is provided which is formed from a series of modular stages interconnected by cables. Each stage may include an antenna, a filter, a compensating amplifier and preferably elements for impedance matching to connecting cables. C... | 01/03/1995 |
| 5212813 | Device for the coupling to a common antenna of at least two transmitting and/or receiving devices This device is intended for the coupling to a same antenna of at least two devices for transmitting and/or receiving microwave frequency signals operating in a same frequency range but having separated working bands. It is constituted by a circuit (M) com... | 05/18/1993 |
| 5151708 | Shortened mast antenna with compensating circuits An automobile mast antenna used in a state shorter than its resonant state including an FM compensating circuit made only of passive elements and compensating for FM signals and an AM compensating circuit made of active elements that convert high impedanc... | 09/29/1992 |
| 5089829 | Antenna device shared by three kinds of waves An antenna device shared by three different waves has a single two-stage collinear antenna constituted by half-wave dipole antennas which are adapted for a vehicle telephone signal and are stacked one upon the other. The device allows an AM-FM radio recei... | 02/18/1992 |
| 5017935 | Multiband antenna system for use in motor vehicles A multiband antenna system for use in a motor vehicle comprising an antenna unit responsible for first and second frequency bands. The antenna unit is electrically coupled to a first conduit tube which is in turn coupled coaxially to a second conduit tube... | 05/21/1991 |
| 4980661 | Diplexer for coupling RF signals, as well as a DC sawtooth signal, to an antenna A diplexer couples a plurality of RF signals and a strobe signal to the antenna of an emergency transmitter buoy. A plurality of filters in the diplexer each pass a preselected signal to the antenna and block other signals from being reflected into the si... | 12/25/1990 |
| 4451832 | Radio frequency transmitter coupling circuit An efficient circuit for coupling at least two radio frequency transmitters of arbitrary power and frequency to one antenna comprises a three-port ferrite circulator connected to the output of each transmitter, a tee connector with a predetermined impedan... | 05/29/1984 |
| 4449128 | Radio frequency transmitter coupling circuit An efficient circuit for coupling at least three radio frequency transmitters of arbitrary power and frequency to one antenna comprises a three-port circulator connected to the output of each transmitter, a four-port connector and a five-port inphase powe... | 05/15/1984 |
| 4424591 | Antenna switch for home video accessories Apparatus is provided for coupling one of two signal sources to the antenna terminals of a television receiver. An antenna switch is provided which includes solid state switching elements which when receiving a biasing voltage connects one of two input po... | 01/03/1984 |
| 4335347 | Power combining or dividing arrangements An n-way power combining or dividing arrangement comprising n-transformers and n-input (combiner) or output (divider) terminals and n-balancing loads which are so arranged that the impedance at each input or output terminal remains substantially constant ... | 06/15/1982 |
| 4308541 | Antenna feed system for receiving circular polarization and transmitting linear polarization An object is to provide for receiving a circularly polarized signal from an antenna feed (10) connected to orthogonally spaced antenna elements (11, 12, 13, 14) and for transmitting a linearly polarized signal through the same feed without switches, and w... | 12/29/1981 |
| 4268834 | Single UHF/VHF antenna system Serially connected UHF and VHF tuners and control of the lead lengths of the conductors to the tuners from the antenna permit utilization of a single antenna for both the UHF and VHF tuners without need for a crossover network. If the lead lengths are sel... | 05/19/1981 |
