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| Number | Title | Issue Date |
| 8018300 | Band rejection filter capable of reducing harmonics and related satellite signal receiver A band rejection filter capable of reducing harmonics includes a first signal end, a second signal end, a high pass filter coupled between the first signal end and the second signal end for performing high pass filtering on signals transmitted between the first sign... | 09/13/2011 |
| 8013690 | Electronically tunable, absorptive, low-loss notch filter An electronically tuned, absorptive, low-loss notch filter with high RF power handling capability is obtained using a four-port quadrature hybrid coupler connected to a matched pair of band pass resonator devices and resistive terminations. The notch filter design u... | 09/06/2011 |
| 7821359 | Band-stop filters Multiple tank elements disposed along a common axis and multiple conductive pads disposed along opposing sides of the tank elements define a serpentine transmission path. The tank elements, each having a capacitor and an inductor in parallel communication, define re... | 10/26/2010 |
| 7679473 | Low pass filter incorporating coupled inductors to enhance stop band attenuation The present invention relates to a low pass filter incorporating coupled inductors to enhance stop band attenuation. In one embodiment, the coupled inductors are provided along with various capacitors to provide for superior performance within a smaller surface area... | 03/16/2010 |
| 7646264 | Varactor tunable RF filters having low distortion and high signal level capability An agile frequency converter provides IF-RF level exchange and notch filtering. System noise and spurious levels generated by channel frequency conversion is reduced in applications requiring broadband combining of frequency converters to form multichannel composite... | 01/12/2010 |
| 7592883 | Dual bandstop filter with enhanced upper passband response A dual bandstop filter affects frequencies in a lower passband, first and second stopbands separated by a middle passband, and an upper passband. The filter includes two legs. In one version, one leg is a highpass filter while the other leg is a bandstop filter outp... | 09/22/2009 |
| 7592882 | Dual bandstop filter with enhanced upper passband response A dual bandstop filter affects frequencies in a lower passband, first and second stopbands separated by a middle passband, and an upper passband. The filter includes two legs. In one version, one leg is a highpass filter while the other leg is a bandstop filter outp... | 09/22/2009 |
| 7427904 | Ultra-high-frequency notch filter having an inductance set by selecting a conductor width An ultra-high-frequency notch filter (100) comprises a capacitor (102) defining a conductive trace (106) on its body (103) and extending between its terminals (104). The trace has an inductance that forms a parallel LC circuit with... | 09/23/2008 |
| 7418251 | Compact radio frequency harmonic filter using integrated passive device technology A radio frequency (“RF”) harmonic filter circuit as disclosed herein is fabricated using integrated passive device (“IPD”) technology. The RF harmonic filter circuit is configured to provide second, third, and fourth harmonic rejection while providing good i... | 08/26/2008 |
| 7352262 | Insulation of anti-resonance in resonators A cancellation circuit to remove the anti-resonance signal from a resonator. Micro-mechanical and surface and bulk acoustic wave resonators include an anti-resonance in an output signal. This has an undesirable effect on certain types of systems in their function an... | 04/01/2008 |
| 7327208 | Printed circuit board including a notch filter for attenuating radio frequency interference A printed circuit board (PCB) including a notch filter, or other suitable filter, is implemented in a communication device for attenuating RFI in transmissions sent from the communication device. The filter includes filter line that runs between at least two conduct... | 02/05/2008 |
| 7265646 | Tamper-resistant filter Method and apparatus for protecting a filter trap that is utilized in a coaxial cable system against theft of service. A barrier is mounted inside a filter housing which includes a pair of end connectors that are aligned along a common axis. The barrier is mounted o... | 09/04/2007 |
| 7230816 | Ultra low inductance multi layer ceramic capacitor A multilayer capacitor having a low parasitic inductance includes a first electrode, a second electrode, a dielectric, a first contact, and a second contact. The first electrode is substantially rectangular and it includes a first contact finger. The dielectric has ... | 06/12/2007 |
| 7221240 | Narrow bandpass filter installed on a circuit board for suppressing a high-frequency harmonic wave The present invention is to provide a narrow bandpass filter installed on a circuit board for suppressing a high-frequency harmonic wave, which uses a metal microstrip method to directly build a microstrip circuit corresponding to a narrow bandpass filter on a circu... | 05/22/2007 |
| 7209188 | Intermediate-frequency circuit having flat group delay characteristic An intermediate-frequency circuit includes a mixer for converting a received TV signal to an intermediate-frequency signal; an intermediate-frequency amplifier for amplifying the intermediate-frequency signal; an intermediate-frequency tuning circuit for tuning to t... | 04/24/2007 |
| 7118532 | Data dependent color wall filters The present invention generally relates to ultrasound. In particular, the present invention relates to data dependent color wall filters (used in ultrasound imaging devices for example). Certain embodiments of the present invention relate to a color wall filter that... | 10/10/2006 |
| 7116200 | Inductive coil assembly An inductive coil assembly having multiple coils arranged at distinct orientations to provide efficient inductive coupling of power or communications or both to a device when the device is arranged at different orientations with respect to the inductive primary coil... | 10/03/2006 |
| 7116954 | Tunable bandpass filter and method thereof The present invention provides a tunable bandpass filter and method thereof. In a preferred embodiment, the tunable bandpass filter uses variable ferro-electric capacitors to adjust both the passband and the notch across the normal operating range of a wireless comm... | 10/03/2006 |
| 7102699 | Radio frequency distribution network system A consumer electronic device includes circuitry configured to produce a signal corresponding to a selected one of first, second and third radio frequency channel. The circuitry includes a modulator configured to modulate the video signal such that it falls within a ... | 09/05/2006 |
| 7095300 | Band eliminate filter and communication apparatus A coaxial capacitor is inserted in a coaxial cable in a predetermined position. A housing is provided as a ground conductor path in order to establish conduction between two external conductors in portions of the coaxial cable which are separated by the inserted coa... | 08/22/2006 |
| 7075389 | Method and apparatus for achieving broadband matching of narrow-band resonator filter impedances to loads and sources A circuit for matching the impedance of a narrow-band resonator filter presented to a port over a broad range of frequencies employs a second resonator that has substantially the same transfer characteristic as the resonator filter. The resonator filter is isolated ... | 07/11/2006 |
| 7057481 | PCB based band-pass filter for cutting out harmonic high frequency The present invention is to provide a PCB based band-pass filter for cutting out harmonic of high frequency wherein in manufacturing a circuit board of a wireless communication product technology of PCB production is utilized to mount an input microstrip line, an ou... | 06/06/2006 |
| 7023298 | Method and apparatus for destructible trap/filter An electrical filter disconnects a connecting pin when uninstalled. A first filter section includes a first set of electrical filter components, while a second filter section includes a second set of electrical filter components, with the connecting pin connecting t... | 04/04/2006 |
| 7005945 | Tamper resistant filter trap Method and apparatus for protecting a filter trap that is utilized in a coaxial cable system against theft of service. A shield is mounted inside the filter trap which contains a pair of end connectors that are aligned along a common axis. The shield has two paralle... | 02/28/2006 |
| 6895190 | Switchable bandwidth lowpass filter A novel transceiver is provided which allow for either a transmitter or receiver to be dynamically switched between two different frequency bands by use of a novel switchable lowpass filter. ... | 05/17/2005 |
| 6867665 | Filters implemented in integrated circuits An integrated RF filter for use at microwave frequencies comprising: an integrated circuit inductor with connected integrated circuit capacitors, arranged as a tank circuit, and an integrated circuit shunt resistor; the inductor, capacitors and resistor being interc... | 03/15/2005 |
| 6861922 | Nonreciprocal circuit device including two series resonant circuits having differing resonant frequencies Three mutually intersecting central conductors are positioned on ferrite to which a direct current magnetic field is applied, the port portions of two of the central conductors are branched and one branched portion of each is extended and bent so as to form an induc... | 03/01/2005 |
| 6847269 | High-frequency module and wireless communication device A high-frequency module is connected to a transmitting circuit (TX), a receiving circuit (RX) and an antenna (ANT) to control the connections between the transmitting circuit (TX) and the antenna (ANT) and between the receiving circuit (RX) and the antenna (ANT). Th... | 01/25/2005 |
| 6816042 | Process to make lightweight objects An “inside out” process is used to make RF antennas and components or higher frequency components and/or optics. An electroformed single or multi layer of metal, such as copper, is applied to a reusable or disposable mandrel. Additional metal or composite compon... | 11/09/2004 |
| 6812811 | Power discriminating systems The present invention relates to a control system for selectively supplying electrical power in a remote environment. The system comprises a plurality of electrical circuits, each designed to operate over a unique frequency passband. Power transmitted within the fre... | 11/02/2004 |
| 6794957 | CATV filter assembly with improved electrical grounding A filter assembly for use in the CATV industry includes a circuit formed by components mounted upon at least one circuit board with a plurality of paths or traces on the board connecting each section of the circuit to a member at ground potential. The grounding memb... | 09/21/2004 |
| 6784760 | Step attenuator using frequency dependent components and method of effecting signal attenuation A filter circuit directed primarily to use in the CATV industry includes at least one frequency dependent component, such as an RF choke, capacitor or inductor, for attenuating signals over at least a portion of the frequency range of signals which pass through the ... | 08/31/2004 |
| 6765458 | LC high-pass filter circuit device, laminated LC high-pass filter device, multiplexer, and radio communication apparatus An LC high-pass filter circuit device includes an inductor defined by via holes formed in adjacent insulating sheets which are connected in the direction of stacking of the sheets so as to define a single trap inductor. Inductor via holes formed in another insulatin... | 07/20/2004 |
| 6737935 | Diplex circuit forming bandstop filter A bandstop filter for use in CATV applications is formed by a pair of diplexers, a lowpass filter and a highpass filter. Signals having a frequency range of, e.g., 0-3 GHz enter at a first node connected to the inputs of both the lowpass and highpass filters. Signal... | 05/18/2004 |
| 6707685 | Multi-layer wiring board A multi-layer wiring board comprises an insulating substrate having, on a central part of its top surface, a semiconductor device mounting portion and having, on its under surface, an external electrode. The insulating substrate includes a multilayered wiring having... | 03/16/2004 |
| 6677833 | Multilayered band separator with grounding parasitic capacitor A multilayer band separator with a grounding parasitic capacitor. The separator includes a quasi-highpass filter, a semi-lumped lowpass filter and a phase shifter. The quasi-highpass filter includes a third capacitor connected to an input signal, a fourth... | 01/13/2004 |
| 6670863 | Device for suppressing electromagnetic coupling phenomena The invention relates to a resonance trap (8) for suppressing electromagnetic coupling phenomena for a line (1), which resonance trap includes a conductor (10) which extends parallel to and along a part of the length of the line (1). Conventional resonanc... | 12/30/2003 |
| 6636405 | Mitigation of 3rd harmonic currents in electrical power distribution systems In a multiple phase system for supplying power from an AC source to nonlinear loads, a device for substantially eliminating currents in a neutral wire. The device includes a completely-passive parallel resonant circuit having three passive electrical bran... | 10/21/2003 |
| 6636129 | Two-tiered tuned filter A reduced length filter including a housing having a female connector end and an opposed male connector end, and a circuit board positioned within the housing. The circuit board has first and second filter sections positioned on upper and lower surfaces t... | 10/21/2003 |
| 6587018 | Notch filter and method An apparatus and method are provided for attenuating an undesired frequency (f1) relative to a desired frequency (f0) in a signal transmitted from an out-put (220) of an active element (210). Generally, the apparatus includes a paral... | 07/01/2003 |
