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Document Title |
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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...
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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...
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7589604 |
Selectable notch filter
According to one exemplary embodiment, a selectable notch filter includes a transmission line, a bias circuit, and a switch for selectably coupling the transmission line to ground. In one...
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7548136 |
Distortion reduction for variable capacitance devices
The present invention reduces distortion in variable capacitance devices by connecting a circuit to the variable capacitance devices that has low impedance at predetermined frequencies to suppress...
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7466211 |
High-frequency switching module and frequency-characteristic adjusting method for high-frequency circuit
A high-frequency switching module in which a high-frequency switch including a diode, which functions as a switching device, and a high-frequency filter including inductors and a capacitor are...
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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...
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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...
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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...
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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....
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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.
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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6587019 |
Dual directional harmonics dissipation system
An apparatus is disclosed wherein a dual directional harmonics dissipation filter includes an input terminal coupled to a RF power amplifier providing a radio frequency signal in a predetermined...
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6587018 |
Notch filter and method
An apparatus and method are provided for attenuating an undesired frequency (f 1 ) relative to a desired frequency (f 0 ) in a signal transmitted from an out-put ( 220 ) of an active element ( 210...
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6529102 |
LC filter circuit and laminated type LC filter
Two LC resonance circuits, each including a parallel combination of an inductor and a capacitor and both magnetically coupled, are connected between an input terminal and an output terminal, and a...
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6512427 |
Spurious signal reduction circuit
A spurious signal reduction circuit which is connected to a main signal line. The spurious signal reduction circuit comprises a resistor having a terminal connected to the main signal line, an LC...
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6476957 |
Image rejecting microwave photonic downconverter
An image rejecting microwave photonic downconverter uses a microwave sub-carrier modulation technique without concern for image frequency interference in the shifted signal, thereby allowing...
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6472957 |
Low power switchable filter tuner
A switchable filter for passing one of a plurality of frequency bands has n bandpass filter sections coupled in parallel between a filter input terminal and a filter output terminal. Each of the n...
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6472956 |
Tunable input trap circuit and image trap circuit
An input trap circuit removes a predetermined frequency component included in an input signal and then outputs the input signal to a circuit at a later stage. The input trap circuit is provided...
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6469590 |
Marine antenna with an integral filter
An antenna ( 24 ) for minimizing reception of undesirable signals below a predetermined frequency band includes a first and a second terminal (A, A′) connectable to at least a receiver ( 22 )....
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6453157 |
Radio frequency tracking filter
A passive bandpass tracking filter tracks the frequency of an RF input signal received within a radio receiver's tracking range of RF frequencies. The bandpass filter includes parallel inductor and...
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6346859 |
Microwave amplifier with reduced beat noise
A microwave amplifier includes a bias circuit including a micro-strip line and a capacitor for biasing an output line of a FET with a DC voltage, and a filter block implemented by a low-pass-filter...
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6232848 |
Low voltage topology for radio frequency integrated circuit design
An integrated radio frequency (RF) coupling scheme is provided for realizing low voltage RF integrated circuits. According to the invention, on-chip capacitively coupled resonant elements are used...
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6166458 |
Power conditioning circuit
A power conditioning circuit for conditioning power supplied by a power source at a nominal frequency over line, neutral and ground conductors includes first, second and third impedances coupled to...
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6147576 |
Filter designs utilizing parasitic and field effects
A method for designing a filtering device essentially comprising the steps of determining a desired response of the filtering device at a selected frequency; and selecting a circuit element that...
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6104259 |
Harmonic suppression circuit
Disclosed herein is a harmonic suppression circuit having a first microstrip line and a second microstrip line each having the same characteristic impedance. One end of the first microstrip line is...
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6100776 |
High-frequency composite transmission section with switch, LC filter, and notch filter
The invention provides a high-frequency composite unit, wherein: a two-terminal switch constituting a transmission section, an LC filter, and a notch filter are connected between a first terminal...
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6091312 |
Semi-lumped bandstop filter
The inventive bandstop filter is suitable for use in a multi-layer ceramic (MLC) structure. Specifically, the filter is a semi-lumped type, formed by lumped capacitors and distributed transmission...
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6084486 |
Controllable filter and high frequency apparatus using the same
A filter comprises an inductor, a first variable capacitance diode, a second variable capacitance diode having nearly identical characteristic as the first variable capacitance diode, a control...
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6043569 |
Zero phase sequence current filter apparatus and method for connection to the load end of six or four-wire branch circuits
An apparatus and method for substantially reducing zero sequence harmonic currents at the load-end of branch circuits that supply single-phase, non-linear loads. The invention includes a...
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5999058 |
Microwave amplifier
A microwave amplifier includes an FET, a DC bias voltage supply circuit, and a beat smoothing circuit. The FET amplifies a microwave signal including a plurality of carrier frequencies that are...
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5963842 |
Satellite broadcasting receiving tuner
A satellite broadcasting receiving tuner having a band-pass filter capable of adequately attenuating and removing disturbing wave components having frequencies in the vicinity of 480 MHz and...
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5932522 |
Superconducting radio-frequency bandstop filter
A bandstop filter contains one or more resonant circuits connected by interconnecting transmission lines. The resonant circuits each have a transmission line connected between two capacitors. One...
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