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| Number | Title | Issue Date |
| 8107917 | High linearity tunable bandpass filter A tunable bandpass filter (10) is provided. An RF signal is provided at an input of the tunable bandpass filter, and a level shifted control signal (V1, V2) inputted to the tunable bandpass filter (10) switches a first arrangement and a s... | 01/31/2012 |
| 7917117 | Auto-tuning amplifier This document discloses, among other things, a front end circuit having a selectable center frequency. The center frequency is selected based on a control signal proportional to a phase difference between a reference frequency and an amplifier output. A resonant fre... | 03/29/2011 |
| 7412204 | Distributor and broadcast signal receiving system using the same A distributor arranged between a tuner module and an antenna, the tuner module including a first input portion and a second input portion for inputting a satellite broadcast signal transmitted from an artificial satellite and a ground broadcast signal transmitted fr... | 08/12/2008 |
| 7333791 | Use of an image reject mixer in a forward data channel tuner Disclosed are systems and methods which utilize an image reject mixer in an out-of-band mixer application such as in a forward data channel frequency converter. For example, according to a preferred embodiment, an image reject mixer is utilized to provide a relative... | 02/19/2008 |
| 7327991 | Pulse modulation circuit Provided is a pulse modulation circuit that improves the on/off operation and improves the on/off ratio of an output power of the entire pulse modulation circuit in the switching operation. The pulse modulation circuit inputs a local oscillation wave and a DC pulse ... | 02/05/2008 |
| 7132987 | Antenna device, and a portable telecommunication apparatus including such an antenna device An antenna device (10) for a portable telecommunication apparatus (1) has a first antenna (21) adapted for telecommunication in at least a first frequency band and a second antenna (22) adapted for short-range supplementary communication ... | 11/07/2006 |
| 7113139 | Tunable antenna circuit, particularly for contactless integrated circuit reader An antenna circuit tunable to a determined resonance frequency, includes an antenna coil and adjustable components. The antenna circuit includes a filter having at least one point to tap an electric voltage the amplitude of which forms a pertinent indication for the... | 09/26/2006 |
| 7072698 | Directional antenna for hand-held wireless communications device A system for wireless communications is provided. The system includes a hand-held wireless communications device, such as a cell phone. An antenna is connected to the cell phone. The antenna radiates radio waves over an area of less than 360 degrees of arc, such as ... | 07/04/2006 |
| 7002456 | Receiver circuit and method for tire pressure monitoring system Circuit system and method for receiving and demodulating signals to a tire pressure monitoring system. The circuit comprises a demodulator for receiving an input signal modulated at a first frequency and demodulating the input signal so that information can be extra... | 02/21/2006 |
| 6681103 | On-chip image reject filter With the rising popularity in wireless personal communication systems (PCS), there is a need for low-power, low-cost radio receivers. Low cost can be achieved by integrating the required functions as much as possible, thus minimizing the number of off-chi... | 01/20/2004 |
| 6553216 | RF tunable filter arrangement with tunable image trap A tuner includes a tunable filter for selecting a desired RF signal in response to a tuning control signal and a tunable image trap for rejecting the undesired image signal corresponding to the desired RF signal responsive to the tuning control signal cou... | 04/22/2003 |
| 6240281 | Command protocol for circuits used for receiving microwave signals and device implementing the protocol In order to select one or more microwave signals from among the signals which it receives, the reception device comprises switching circuits. The switching circuits are commanded by command signals. According to the invention, a switching circuit command signa... | 05/29/2001 |
| 6221899 | Terpenoid lactone compounds and their production process This invention provides terpenoid lactone compounds, and processes for producing the terpenoid lactone compounds, which comprise cultivating Oidiodedron griseum FERM BP-5778 and then isolating the terpenoid lactone compounds from the fermentation broth. T... | 04/24/2001 |
| 6055420 | Antenna system having a high Q circuit A tunable antenna system for operation over a predetermined frequency range includes a high Q antenna having a length and width each significantly less than a quarter wavelength within the predetermined frequency range. A controllable reactive element is ... | 04/25/2000 |
| 6035185 | Selective RF circuit with varactor tuned bandpass switched bandpass filters A selective RF circuit for a double conversion tuner includes three double tuned bandpass circuits, each of which is tunable over approximately one-third of the tuning range. Switching diodes are used at the input and the output of each of the bandpass se... | 03/07/2000 |
| 6011965 | Receiver with a tunable parallel resonant circuit In a receiver, a tunable parallel resonant circuit (PRC2) is coupled to an input (IN) of a transistor circuit (MOIC) via a coupling network (CNW). The coupling network (CNW) lacks a varicap diode but includes a coupling resistor (Rc) in series with a coup... | 01/04/2000 |
| 5953642 | System for contactless power and data transmission In a system for contactless power and data transmission, a transmitting or receiving station has at least one transmitting or receiving resonant circuit which is driven by an integrable control circuit. The integrated control circuit has a multiplicity of... | 09/14/1999 |
| 5940745 | Portable transceiver having retractable antenna and matching circuit In a portable radio communication apparatus, a matching circuit is electrically connected to an antenna when the antenna is retracted into a casing. In this condition, the antenna and a feed circuit are matched as desirably as when the antenna is extended... | 08/17/1999 |
| 5907242 | Balanced passive bandpass filter and preamplifier for a receiver A balanced bandpass preamplifier assembly (23) is disclosed for use in a locator (10) for locating a beacon transmitter (18) housed within an underground boring device (12). The bandpass preamplifier assembly (23) includes a balanced bandpass filter (28) ... | 05/25/1999 |
| 5585617 | Non-contact IC card communicating at multiple frequencies A non-contact IC card capable of communicating with external equipment at various communication frequencies. An antenna circuit of variable frequency and a frequency switching circuit for supplying communication clock signals of variable frequency to a mo... | 12/17/1996 |
| 5568098 | Frequency synthesizer for use in radio transmitter and receiver A phase comparator (91) makes a phase comparison between a frequency-divided signal from a frequency divider (98) and a reference oscillation signal from a reference signal oscillator (90). The phase error signal obtained from the comparison is passed thr... | 10/22/1996 |
| 5542118 | Induction field coupled transmission system incorporating a passive transmitter A remote, unpowered passive transmitter has a tank circuit, a coil and capacitor. The capacitor is variable to vary the frequency of the tank. This is coupled to a receiver having a hybrid splitter. With four ports, two balanced, opposing ports connect to... | 07/30/1996 |
| 5499398 | Wristwatch-type selective calling receiver A selective calling receiver comprises two separate bands having an antenna circuit for tuning incorporated therein. The first band has a first antenna and tuning capacitors incorporated therein and stoppers formed and arrayed on the outer surface thereof... | 03/12/1996 |
| 5301358 | Automatic antenna tuning method and apparatus A wristwatch paging receiver is provided with an antenna matching network that automatically retunes the network at the beginning of a listening interval. During the retuning operation, a control signal is applied to a variable tuning element in the match... | 04/05/1994 |
| 5198825 | Reception system for a motor vehicle An inductance element is arranged to parallel resonate with a ground stray capacitance component of an antenna element on a motor vehicle and a feeder cable to a receiver. Matching means is provided to compensate for a Q-factor of the parallel resonance f... | 03/30/1993 |
| 4956710 | Television receiver tuner high pass input filter with CB trap The present invention is for a highpass input circuit for a television receiver having an additional trap at a predetermined frequency, e.g. CB frequencies. A M derived constant K high pass filter having an intermediate pi configured filter section is pro... | 09/11/1990 |
| 4414688 | RF-Input stage RF-input stage for TV receivers comprising a field effect transistor in grounded source circuit configuration and a frequency-dependent coupling network arranged between the gate electrode of the field effect transistor and an aerial input for selecting T... | 11/08/1983 |
| 4352207 | Noise suppression circuit A noise-suppressing circuit suitable for insertion between a receiving antenna and an RF receiver to suppress noise in the RF signal received by the receiving antenna includes a bandpass filter circuit connected to receive as an input the RF signal receiv... | 09/28/1982 |
| 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 |
| 4267604 | UHF electronic tuner An RF input tuning circuit in a UHF electronic tuner uses a semicoaxial resonant cavity circuit which feeds amplifier and other tuning circuits not of the semicoaxial type, such as lumped constant or strip-line types.... | 05/12/1981 |
| 4247954 | Active window antenna for motor vehicles To minimize overmodulation in an active window antenna and radio receiver system, an amplification control voltage is produced in the active antenna, i.e., directly behind the antenna pre-amplifier, and is used to control the amplification of the pre-ampl... | 01/27/1981 |
| 4236127 | Electrical frequency responsive structure An electrical frequency responsive circuit comprising a first coil constructed of wire having an insulating coating thereon wound in a single layer about an axis of generation, and a second coil, also constructed of wire having an insulating coating there... | 11/25/1980 |
| 4225823 | Front end circuits of FM receivers The front end circuit is constituted by first and second signal paths for transmitting a high frequency signal received by an antenna, and a transfer switch for selecting either one of the signal paths depending upon the state of the received signal, and ... | 09/30/1980 |
| 4106025 | Coupling converter for vehicle antennas A coupling converter for use of a broadcast-receiving antenna both with its broadcast receiver and with a citizens band transceiver, including impedance matching means and a priority switch to protect the transceiver from overload by transmission without ... | 08/08/1978 |
| 4048569 | Receiver automatic gain control system A receiver with an automatic gain control system is disclosed in which the signal path between the output coil of an antenna tuning coil and a first stage of a circuit supplied with a received signal from the antenna tuning coil is connected in parallel w... | 09/13/1977 |
| 4037177 | Radio-frequency coupler A radio-frequency coupler comprising a first terminal for interconnection with a conventional automobile receiving antenna used for receiving rf transmissions within a first radio-frequency band, a second terminal for interconnection with a receiver opera... | 07/19/1977 |
| 3991373 | Input circuit for a microwave receiving system An input circuit for use in a microwave receiving system. The input circuit includes an antenna for receiving the microwave signals and a parametric down converter, which operates in a lower side-band frequency position. The parametric down converter incl... | 11/09/1976 |
| 3947629 | Television receiver I. F. circuitry A television receiver comprising a first printed circuit board having a helical resonator filter, an adjacent channel trap circuit and an impedance converter circuit for providing a reduced output impedance, the first printed circuit board being secured t... | 03/30/1976 |
