Famous Patents
The first match was accidentally discovered in 1826 when John Walker scraped a stick with chemicals on the end against a stone floor.
PatentStorm News
Make the Most of Our Site
See this month's Top Inventors and Most Cited Patents.
Stay on top of the latest innovations by subscribing to an RSS feed.
Registered users: Manage your profile.
| Number | Title | Issue Date |
| 7365606 | Receiving amplifier, in particular for television receivers, and use of the receiving amplifier A receiving amplifier includes a semiconductor body with a first node, a second node and an amplifier circuit. The amplifier includes at least one field-effect transistor, a first input, and a second input. A capacitive element is arranged between the inputs of the ... | 04/29/2008 |
| 7289784 | Active tunable filter circuit An active tunable filter circuit for use as an integratable active filter in a mobile radio apparatus, comprises an active amplifier circuit (A) including a reactive feedback network including a first tunable element (L1) set to pass with amplification a want... | 10/30/2007 |
| 7239219 | Miniature RF and microwave components and methods for fabricating such components RF and microwave radiation directing or controlling components are provided that may be monolithic, that may be formed from a plurality of electrodeposition operations and/or from a plurality of deposited layers of material, that may include switches, inductors, ant... | 07/03/2007 |
| 6985053 | Negative resistance circuit In order to provide a negative resistance circuit which is not influenced by means of change of temperature and source voltage, etc., operates stably and has simple circuit construction, a first stage circuit of the negative resistance circuit is a collector-emitter... | 01/10/2006 |
| 6954123 | Tuning circuit Selectivity Q of a tuning circuit is maximized by using a negative resistance circuit that is not influenced significantly by changes in conditions such as temperature, source voltage, etc. The tuning circuit operates stably and is constituted by a series resonance ... | 10/11/2005 |
| 6870447 | Tuning circuit A tuning circuit using a negative resistance circuit for compensating an equivalent series resistance component thereof is provided. The negative resistance circuit has simple circuit construction and design and adjustment thereof is easy. The tuning circuit compris... | 03/22/2005 |
| 6573788 | Amplifier device with frequency-response-compensating amplifier reactance, and use of the amplifier device The amplifier device serves the purpose of broadband amplification of an electric input signal fed from a signal source. It has an amplifier input for feeding the input signal, and a broadband amplifier element. Provided for the purpose of compensating a ... | 06/03/2003 |
| 6414551 | Multi-space structure amplifier A high frequency amplifier with the multi-space structure, amplifying various frequencies by a Gunn diode in the multi-space structure, composed of non-radiative dielectric waveguides of various different sizes. An amplifier circuit includes a Gunn diode ... | 07/02/2002 |
| 5920231 | Negative differential resistance amplifier There is provided a negative differential resistance amplifier comprising a negative differential resistance transistor having negative input conductance by utilizing resonant tunneling effect. The transistor is electrically connected to a signal source c... | 07/06/1999 |
| 4409557 | Bandpass filter with an active element An amplifier including an in phase feedback signal to therefore exhibit negative resistance is receptive of an input alternating signal which includes a frequency F. The output of the amplifier is coupled to a resonator adjusted to a center frequency F an... | 10/11/1983 |
| 4338582 | Electronically tunable resonator circuit An electronically adjustable capacitor (varactor), an active element such as a Field Effect Transistor arranged to exhibit negative resistance, and an inductor are arranged as a frequency tunable resonator suitable for use at microwave frequencies. The ne... | 07/06/1982 |
| 4175257 | Modular microwave power combiner A modular microwave power combiner having a plurality of identical microwave diode amplifier circuits grouped in sets within the body of a modular unit which are electrically coupled in parallel to a central cavity sized to be resonant at a single frequen... | 11/20/1979 |
| 4090155 | Transmission line for electromagnetic wave A transmission line is disclosed which comprises a conductive layer, a resistive semiconductor layer disposed on the conductive layer and a blocking electrode disposed on the resistive semiconductor layer. By applying a biasing voltage between the blockin... | 05/16/1978 |
| 4063186 | Broadband millimeter wave amplifier A millimeter wave amplifier having broadband characteristics in which a G diode or other two terminal negative resistance device having an integral heat sink is center mounted in a reduced height waveguide. The heat sink is attached to a mechanism for se... | 12/13/1977 |
| 4050032 | Avalanche diode amplifier A microwave amplifier is disclosed using a nonreciprocal three port junction circulator. The amplifier uses a ferrite circulator having an input port, an output port and a third electrical port. A semiconductor device such as an IMPATT diode having negati... | 09/20/1977 |
| 4025872 | Negative resistance network A network characterized at a reference terminal pair by a negative resistance at a frequency near nfo, where n is an integer greater than one. The network comprises a circuit element characterized by a negative resistance at frequencies in the ... | 05/24/1977 |
| 4021750 | Broad-band TRAPATT amplifier having a tapered idler circuit A broad-band microwave amplifier including a semiconductor TRAPATT diode generating a microwave signal at its fundamental, second and third harmonic frequencies. Energy is extracted at the second harmonic frequency and a certain impedance loading is provi... | 05/03/1977 |
| 4009446 | Dual diode microwave amplifier A Microwave reflection amplifier having improved gain, bandwidth and noise characteristics, uses two negative-resistance diodes, such as Gunn-effect diodes, connected in series across the terminals. The diodes are series resonated by inductance in their l... | 02/22/1977 |
| 4005372 | Frequency tunable microwave apparatus having a variable impedance hybrid idler circuit A frequency tunable microwave apparatus including a semiconductor TRAPATT diode generating a microwave signal at its fundamental, second and third harmonic frequencies. Energy is extracted at the second harmonic frequency and a certain impedance loading i... | 01/25/1977 |
| 3974459 | Millimeter waveguide oscillator and amplifier structure Disclosed is a millimeter wave waveguide structure adapted for operation with negative resistance devices, such as solid state avalanche breakdown diodes, at frequencies up to about 170 GHz or higher. A central portion of the structure is formed by a cyli... | 08/10/1976 |
| 3946336 | Microwave solid state circuit employing a bipolar transistor structure This microwave circuit incorporates a transistor structure that provides either a two port amplifier or an injection frequency locked oscillator. This circuit eliminates circulators employed with Gunn and Impatt diode amplifiers and injection frequency lo... | 03/23/1976 |
