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| Number | Title | Issue Date |
| 8154362 | Constant impedance filter A method and apparatus to provide a bi-directional constant impedance filter. Embodiments include electric networks which give filter responses while presenting a constant impedance to a signal received at either an input or an output port for a plurality of frequen... | 04/10/2012 |
| 8008991 | Electrical filter having a dielectric substrate with wide and narrow regions for supporting capacitors and conductive windings An electrical filter includes a circuit board with an insulative substrate of alternating wide and narrow portions between input and output ends. Capacitors received in through-holes in the wide portions are electrically coupled to signal traces on a signal surface ... | 08/30/2011 |
| 7468642 | Multi band pass filters A multi-band band pass filter, including: first and second multi-order asynchronous resonators connected to each other by a coupling resonator and connected to respective first and second matching resonators, the first matching resonator connected to a signal-in ter... | 12/23/2008 |
| 7362174 | Current-controlled CMOS (C3MOS) wideband input data amplifier for reduced differential and common-mode reflection Current-controlled CMOS (C3MOS) wideband input data amplifier for reduced differential and common-mode reflection. Impedance matching and bandwidth extension provides desired gain at higher frequencies and may be achieved at the interface between silicon and package... | 04/22/2008 |
| 7348866 | Compact printed filters with self-connected LC resonators An LC filter structure and method for its fabrication, in which multiple shunt capacitors, multiple shunt inductors and multiple coupling inductors are printed on a metal layer formed on a thin dielectric substrate. The capacitors have first electrodes that are form... | 03/25/2008 |
| 7348931 | Unbalanced power feeding antenna device for making radio communications An antenna device which is connected to a radio module performing radio communications with a system using a first band and a system using a second band, has an antenna element which transmits/receives radio signals in the first and second bands. The antenna device ... | 03/25/2008 |
| 7327035 | System and method for providing a low frequency filter pole Systems are provided for producing a low frequency filter pole. A first bond pad is coupled to a power source. A second bond pad is inductively connected to the first bond pad by a first bond wire. A capacitor is connected to the second bond pad. A third bond pad is... | 02/05/2008 |
| 7262674 | Bandpass filter having first and second serially coupled collection of filter components for providing upper and lower rejection notches A bandpass filter having a transmission coefficient—frequency spectrum characteristic curve with a notch on each side of the passband is disclosed. ... | 08/28/2007 |
| 7161377 | Bus type connection system in particular for backplanes The invention relates to bus type connection systems, in particular those for wiring backplanes of electronic systems, when the bus comprises connectors distributed in an irregular manner. It consists in selecting segments (D1, D2) over which t... | 01/09/2007 |
| 7161434 | Amplifier An amplifier comprising a field effect transistor, a terminating network comprising inductors connected in series separated by capacitors connected in parallel, a filter and a load, wherein the values of the capacitors and inductors are arranged to present open circ... | 01/09/2007 |
| 7078986 | Symmetrical polyphase network First, second, third, and fourth resistors are coupled to first, second, third, and fourth capacitors. A first positive in-phase terminal is coupled to the first resistor and the first capacitor. A first negative in-phase terminal is coupled to the fourth resistor a... | 07/18/2006 |
| 7078987 | Narrow band-pass tuned resonator filter topologies having high selectivity, low insertion loss and improved out-of-band rejection over extended frequency ranges A tuned resonator circuit topology is disclosed that permits implementation of narrow band-pass filters having high loaded Q and optimal coupling (for low insertion loss) using a parallel tuned resonator topology at frequencies in the 1 to 2 GHz range and beyond. Th... | 07/18/2006 |
| 7002434 | Lumped-element transmission line in multi-layered substrate A lumped-element transmission line is formed in a multi-layered substrate. A mutual inductance between first and second inductors in a T-equivalent circuit model is enlarged to a designed positive value to widen the application frequency bandwidth of the transmissio... | 02/21/2006 |
| 6970057 | Lowpass filter formed in a multi-layer ceramic A lowpass filter formed in a multi-layered substrate includes a first capacitor formed on at least one layer of the multi-layered substrate and being electrically connected to a first node, a first inductor being electrically connected to the first capacitor at the ... | 11/29/2005 |
| 6949988 | Constant impedance filter A constant impedance filter maintains a constant input impedance for frequencies that are both inside the filter passband and outside the filter passband. The constant input impedance appears as a pure resistance. The constant impedance filter includes a plurality o... | 09/27/2005 |
| 6930567 | Transmission system The present invention provides a transmission system having a signal source which has an internal resistance, having a signal transmission line (102), one end of which is connected to the signal source, and having a terminating resistance which is connected t... | 08/16/2005 |
| 6904666 | Method of manufacturing microwave filter components and microwave filter components formed thereby A simplified method for forming passive microwave components, such as a filter, and passive microwave components formed by the method. The method includes forming a ceramic insert having a plurality of resonator regions and then die casting an outer casing of a cond... | 06/14/2005 |
| 6608536 | Constant impedance filter A constant impedance filter maintains a constant input impedance for frequencies that are both inside the filter passband and outside the filter passband. The constant input impedance appears as a pure resistance. The constant impedance filter includes a ... | 08/19/2003 |
| 6529100 | Polyphase filter and receiver using the same A polyphase filter having metal-insulator-semiconductor (MIS) capacitors in which the whole body of the polyphase filter is fabricated as an IC. Resistors are individually combined with the capacitors to form serial connection circuits and every four sign... | 03/04/2003 |
| 6473510 | AC power source filter for audio video electrical load A filter for suppressing noise surges and noise frequencies in ac power lines to an audio video load includes at least one noise suppression circuit. The noise suppression circuit in turn includes first and second inductors coupled to respective power lin... | 10/29/2002 |
| 6438394 | Frequency dependent inductor apparatus and method for a narrow-band filter The present invention provides for a super-narrow band filter using frequency dependent L-C components. The invention utilizes a frequency dependent L-C circuit with a positive slope k for the inductor values as a function of frequency. The positive k val... | 08/20/2002 |
| 6317016 | Method and arrangement for gyration filtering with low power consumption An arrangement of differential amplifying-type gyrators is used to implement a signal-filtering circuit with significantly reduced power consumption. One specific example implementation is directed to a signal-filtering circuit arrangement that uses a gyr... | 11/13/2001 |
| 6170154 | Printed lumped element stripline circuit structure and method A novel circuit packaging structure including a combination of printed lumped elements within a multi-layer stripline architecture is provided and methods of making the same. The lumped elements are provided by printing the individual passive elements, in... | 01/09/2001 |
| 5973579 | Ladder type intermediate frequency filter A piezoelectric filter is one not changing in the holding position of resonator in spite of impulse, small in the number of parts, easy to assemble from one direction, small, thin, and stable in characteristic. For example, as shown in FIG. 7, on electrod... | 10/26/1999 |
| 5793265 | Compact diplexer A diplexer for use in communication of telephony and high-speed data transmission, including television, comprises two filters, each of which is constructed with plural stages in the form of a ladder network, one of the filters being a high-pass filter an... | 08/11/1998 |
| 5770983 | Reduced length tuned filter having transverse oriented coils The invention provides a tuned filter of reduced overall length in which two coils (air core inductors) are placed side by side, in mounting locations that are transverse with respect to the longitudinal direction of the filter, instead of in-line or diag... | 06/23/1998 |
| 5625894 | Switch filter having selectively interconnected filter stages and ports A switch filter is disclosed wherein switches are incorporated into the filter and divide the filter into various half-filters. The switch filter includes parallel and series LC circuits, switches, two input ports and two output ports where the input and ... | 04/29/1997 |
| 5616539 | High temperature superconductor lumped element band-reject filters Lumped element electrical components, such as inductors and capacitors, are formed to include high temperature superconducting materials. In the preferred embodiment, thin film epitaxial high temperature superconductors are patterned to form capacitors an... | 04/01/1997 |
| 5576673 | Small, low-pass filter for high power applications A small (about 8 inches long) low pass, high power (4000 watts) electric filter may include a tubular outer conductor separated from an dielectric sleeve by an outer dielectric that may be an air-filled gap. The dielectric sleeve surrounds a series of alt... | 11/19/1996 |
| 5574413 | Tunable filter having a capacitive circuit connected to ground A tunable filter (100) includes first and second resonant structures (140, 145) coupled by a capacitive coupler (120). The capacitive coupler (120) includes two tunable elements (121, 126) coupled by a capacitive circuit formed at least in part by a capac... | 11/12/1996 |
| 5359315 | Method of forming a three-layer structural spiral inductor A selected inductance can be provided by a three-layer structural spiral inductor having an inductor conductive part disposed between two ground electrodes within an electric insulating substrate. This is carried out by eliminating a particular portion of... | 10/25/1994 |
| 5355533 | Method and circuit for radio frequency signal detection and interference suppression This invention provides a method and circuit for separating a signal of interest from a composite signal including a signal of interest and an angle modulated interfering signal, in which an in-phase component of a reference signal representative of a com... | 10/11/1994 |
| 5175518 | Wide percentage bandwidth microwave filter network and method of manufacturing same A high percentage bandwith microwave filter network, according to an embodiment of the present invention, comprises a T-network of capacitors implemented with thin-film techniques by applying a groundplane to one side of an alumina substrate and a first p... | 12/29/1992 |
| 5166621 | Multi-resonant NMR coils A saddle coil for multiple tuned response is realized by a segmented sequence of first LC elements each tuned to exhibit a low impedance at ω1 and a second set of LC elements, each tuned to exhibit a low impedance at ω2, at least s... | 11/24/1992 |
| 5107233 | Amplitude correction of field coupled varactor tuned filters In a multi-stage, varactor-tuned bandpass filter utilizing electromagnetic field coupling between successive filter stages, the effective area of a coupling window provided in the RF shielding separating the filter stages is varied as a function of the va... | 04/21/1992 |
| 5072200 | Combination of active and passive filters A combination of passive electrical filters and active electrical filters in a series arrangement forming active passive band pass or high pass or low pass or band reject filters. The preferred embodiment includes an amplifier stage to include high input ... | 12/10/1991 |
| 5042085 | Radio frequency data communication band pass filter The RF data communication band pass filter is a fixed device that filters both RF multi-level data signals and binary-level data signals. The RF data communication band pass filter comprises a low pass filtering means having a corner frequency of approxim... | 08/20/1991 |
| 5004991 | Low pass filter system for an electrical circuit A low pass filter system for filtering from an electrical circuit unwanted high frequency signals while allowing passage to a passband of wanted signals of lower frequency wherein the filter system comprises a low pass filter (1) and a group delay equaliz... | 04/02/1991 |
| 4961059 | Combined RFI rejection and intergrating two-section filter A combined RFI filter and low pass filter includes two sections, both of which serve as both radio frequency interference filters and low pass filters, or dc integrators. Both sections have substantially equal time constants and employ non-polarized capac... | 10/02/1990 |
| 4881050 | Thin-film microwave filter A thin-film, lumped element filter utilizing spiral inductors and capacitive pi networks is disclosed. The filter is fabricated from a planar dielectric substrate having a ground plane on one side thereof and two thin-film metal layers and an insulation l... | 11/14/1989 |
