Class / Patent application number | Description | Number of patent applications / Date published |
333168000 | Including recurrent sections | 14 |
20090027139 | BAND-PASS FILTER - A bandpass filter is described herein. The bandpass filter has two parallel signal branches, each connected, on an input side, to an input node and, on an output side, to an output node. The two signal branches form a ring resonator, having a wave mode with a complex amplitude of Ū | 01-29-2009 |
20090134953 | Radio frequency devices with enhanced ground structure. - Tunable radio frequency (RF) devices, such as phase shifters and filters, are formed by depositing thin film layers on a substrate and patterning the thin film layers by various lithography techniques. A thin film metal layer is patterned to form a plurality of capacitors and inductors, leaving at least two grounding regions that lie closely adjacent the capacitors and inductors. As patterned portions of the grounding regions are electrically isolated from each other. Performance of the devices are improved by electrically bridging the differential potential grounding regions. | 05-28-2009 |
20100060380 | LOW-LOSS TUNABLE RADIO FREQUENCY FILETER - A tunable RF filter comprises a signal transmission path having an input and output, a plurality of resonant elements disposed along the signal transmission path between the input and output, and a set of non-resonant elements coupling the resonant elements together to form a stop band having a plurality of transmission zeroes corresponding to respective frequencies of the resonant elements, and at least one sub-band between the transmission zeroes. The set of non-resonant elements comprises a first plurality of non-resonant elements respectively coupled in parallel with the resonant elements, and a second plurality of non-resonant elements respectively coupled in series with the resonant elements. The first plurality of non-resonant elements comprises at least one variable non-resonant element for selectively introducing at least one reflection zero within the stop band to create a pass band in one of the one sub-band(s) without varying any of the second plurality of non-resonant elements. | 03-11-2010 |
20100207706 | LEFT-HANDED FILTER - A left-handed filter of the present invention includes an interstage coupling element connected to a first capacitor and a ground, a second capacitor connected to the interstage coupling element, a third capacitor connected to the second capacitor, a first inductor connected to the connection point of a fourth capacitor and the second capacitor, and the ground, a second inductor connected to a fifth capacitor and the ground, a first input and output coupling element connected to a sixth capacitor, and a second input and output coupling element connected to the third capacitor. The first and second capacitors, the third and sixth capacitors, the first and second inductors, and third and fourth inductors are respectively arranged in symmetrical positions with respect to an interstage coupling element. | 08-19-2010 |
20100244983 | 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 frequencies. | 09-30-2010 |
20110050361 | RADIO FREQUENCY FILTER - Parameters of a radio frequency filter can be changed by changing structure of each component of the filter. Material of each component, diameters of each of magnetic cylinders, density of each of conductive coils, thickness of a dielectric layer, and thickness of an insulation tube can be changed. When any component needs to be replaced, each cover is rotated, with connection partitions move to two slots of a resisting portion, to detach the filter. | 03-03-2011 |
20110050362 | RADIO FREQUENCY FILTER AND FILTERING UNIT THEREOF - Parameters of a radio frequency filter can be changed by changing structure of each component of the filter. Material of each component, diameters of each of magnetic cylinders, density of each of conductive coils, thickness of a dielectric layer, and thickness of an insulation tube can be changed. When any component needs to be replaced, each cover is rotated, with connection partitions move to two slots of an insulation portion, to detach the filter. | 03-03-2011 |
20120182089 | Passive Harmonic Filter for Power Distribution Systems - A subsea power distribution system includes a three-phase AC power source; multiple variable frequency drives having inputs and outputs, with their inputs connected to the AC power source; an electric motor connected in series to the output of each variable frequency drive; and a passive harmonic filter system having its input connected, in parallel with the variable frequency drives, to the AC power source. The filter system includes multiple harmonic filters, each harmonic filter tuned to a specific harmonic frequency. Each harmonic filter includes a plurality of sub-filters. Each sub-filter includes a reactor connected in series to a main capacitor and one or more detuning capacitors. Each of the multiple harmonic filters is tuned to a different specific harmonic, and includes sub-filters also tuned to the same respective harmonic, and each sub-filter is sized to equally share the kVAR load of its respective harmonic filter. | 07-19-2012 |
20120256703 | BANDPASS FILTER AND ELECTRONIC DEVICE - A bandpass filter includes resonator coupling line on which a plurality of composite right/left-handed (CRLH) resonators are disposed. The plurality of CRLH resonators are inductively coupled with each other. The design variables can be increased through inductive coupling in the resonance period. Also, the skirt characteristics and the isolation can be improved. | 10-11-2012 |
20130106532 | BAND-PASS FILTER USING LC RESONATORS | 05-02-2013 |
20130285766 | Rotating Coefficient Filter - A circuit that provides a rotating coefficient FIR filter with all necessary coefficient sets present at the same time, without the need for delay elements or devices providing for adjustable impedances is described. An input signal is sampled in round robin fashion by a plurality of sample and hold devices. The outputs of the sample and hold devices are connected to sets of impedance devices. Each set of impedance devices implements the coefficients of the desired frequency response of the filter. The impedance devices in each set are connected to the sample and hold devices in a different order from each other set, so that each set of impedance devices will produce the desired frequency response when a different one of the sampling circuits contains a new sample of the input signal. Switches connect the sets of impedance devices to an output, only one switch being closed at a time to provide the output signal. | 10-31-2013 |
20140266504 | WIDE-BAND COMMON MODE FILTERING APPARATUS - A wide-band common mode filtering apparatus includes at least two cascaded common mode filters with different noise-filtering responses, wherein the cut-off frequency of the wide-band common mode filtering apparatus is at the lowest cut-off frequency of the common mode filters, and the noise-filtering response of the wide-band common mode filtering apparatus is the superposition of the noise-filtering responses of the common mode filters. In one embodiment of the present invention, the wide-band common mode filtering apparatus includes a first common mode filter having a first filtering band, and a second common mode filter having a second filtering band different from the first filtering band. The disclosure of the present technique allows the cascaded common mode filters with different filtering bands to form the wide-band common mode filtering apparatus having an overall filtering band to meeting a new demand. | 09-18-2014 |
20140327497 | COUPLED-RESONATOR ON-DIE FILTERS FOR WIFI APPLICATIONS - A radio frequency (RF) filter circuit for rejecting one or more spurious components of an input signal has a first resonator circuit including a first capacitor and a first coupled inductor pair of a first inductor and a second inductor, and a second resonator circuit with a second capacitor and a second coupled inductor pair of a third inductor and a fourth inductor. First and second resonator coupling capacitors are connected to the first resonator circuit and the second resonator circuit. A first port and a second port are connected to the first resonator circuit and the second resonator, with the filtered signal of the input signal passed through both the first resonator circuit and the second resonator circuit being output. | 11-06-2014 |
20160065164 | FILTER COMPONENT WITH WINDINGLESS MAGNETIC TOROIDAL CORE - Filter component having a windingless magnetic toroidal core with an opening, a toroidal core housing in which the toroidal core is fastened using a snap-on mechanism, wherein the filter component is designed such that a conductor can be run windinglessly through the opening of the toroidal core fastened in the toroidal core housing. | 03-03-2016 |