Patents
Sitemap › H01 - Basic electric elements › H01F - Magnets; Inductances; Transformers; Selection of materials for their magnetic properties › H01F 21 - Variable inductances or transformers of the signal type
Patents for H01F 21 - Variable inductances or transformers of the signal type (1,432)
12/2003
12/25/2003US20030234698 Circuit component and transformer device with controllable impedance and with systems equipped with such devices
12/16/2003US6664881 Efficient, low leakage inductance, multi-tap, RF transformer and method of making same
12/10/2003CN1461019A Ferrite adjustable chip inductor
12/10/2003CN1461018A Electrostatic driven micromachine changeable inductor
12/04/2003US20030222750 On-chip differential multi-layer inductor
11/2003
11/25/2003US6654210 Solid-state inductor and method for same
11/25/2003US6653924 Transformer with controlled interwinding coupling and controlled leakage inductances and circuit using such transformer
11/20/2003WO2002076289A3 Wireless system for measuring distension in flexible tubes
11/05/2003CN1453803A Solid inducer and producing method thereof
10/2003
10/29/2003EP1357600A2 Solid-state inductor and method for producing the same
10/23/2003US20030197587 Solid-state inductor and method for same
09/2003
09/30/2003US6628188 Variable inductor and method
09/23/2003US6624735 Three-terminal variable inductor and method of making the same
09/09/2003US6617947 Tuning circuit
09/04/2003US20030165002 Magnetic field generator for optical devices utilizing magneto-optical effect, and method of fabricating base substrate thereof
09/03/2003EP1340040A2 Improved linear variable differential transformers for high precision position measurements
08/2003
08/28/2003WO2002027793A3 Method and apparatus for providing a variable inductor on a semiconductor chip
08/28/2003US20030160668 Tuning circuit
08/21/2003WO2003069795A1 System and associated suppression assembly for limiting electromagnetic emissions in network devices communicating via a network bus
08/14/2003US20030154316 System and associated suppression assembly for limiting electromagnetic emissions in network devices communicating via a network bus
08/05/2003US6603382 Inductive element having improved superposed DC current characteristic
07/2003
07/30/2003CN1433033A Inductance part with permanent magnet set in magnetic gap
07/30/2003CN1433032A 可调感应器 Adjustable sensor
07/29/2003US6600403 Planar inductor
07/22/2003US6597271 Electromagnetic apparatus having adjusting effective core gap
07/22/2003US6597269 Convergence coil structure for a deflection yoke and method of producing deflection yokes
07/16/2003EP1327252A1 Linear inductive fluid level sensor
07/10/2003US20030128092 Tunable inductor
06/2003
06/26/2003WO2003052780A1 Inductive component
06/26/2003US20030117228 Circuit component and transformer device with controllable impedance and with systems equipped with such devices
06/24/2003US6583704 Variable inductor
06/11/2003CN2555589Y Semi-variable high frequency impedance matcher
06/03/2003US6573822 Tunable inductor using microelectromechanical switches
05/2003
05/13/2003US6563412 Rotary variable differential transformer
05/01/2003WO2003036665A1 Low-profile transformer and method of manufacturing the transformer
04/2003
04/29/2003US6556416 Variable capacitor and a variable inductor
04/29/2003US6556415 Tunable/variable passive microelectronic components
04/17/2003US20030071705 Electromagnetic apparatus having adjusting effective core gap
04/15/2003US6549096 Switched inductor/varactor tuning circuit having a variable integrated inductor
04/03/2003US20030063427 Variable capacitor and a variable inductor
02/2003
02/26/2003EP1286465A1 Microelectromechanical device
02/13/2003US20030030527 Microelectromechanical component
02/06/2003CA2397187A1 Microelectromechanical component
02/04/2003CA2216357C Dc/ac power converter
01/2003
01/16/2003WO2002044647A3 Improved linear variable differential transformers for high precision position measurements
01/02/2003EP1271763A2 High frequency apparatus
12/2002
12/24/2002US6498556 Three-terminal variable inductor
12/19/2002US20020190835 Tunable inductor using microelectromechanical switches
12/19/2002US20020190833 Three-terminal variable inductor
12/19/2002US20020190830 Inductor component containing permanent magnet for magnetic bias and method of manufacturing the same
12/05/2002US20020183022 Flat coil component, characteristic adjusting method of flat coil component, ID tag, and characteristic adjusting method of ID tag
12/05/2002US20020180575 Inductance component comprising a permanent magnet greater in sectional area than a magnetic path and disposed in a magnetic gap
12/04/2002EP1263005A1 Inductance component comprising a permanent magnet greater in sectional area than a magnetic path and disposed in a magnetic gap
12/04/2002EP1262932A1 Flat coil component, characteristic adjusting method of flat coil component, id tag, and characteristic adjusting method of id tag
11/2002
11/28/2002US20020175677 Linear variable differential transformers for high precision position measurements
11/21/2002DE10212930A1 Induktorkomponente mit einem Permanentmagnet für magnetische Vorspannung und Herstellungsverfahren derselben Inductor having a permanent magnet for magnetic bias and production method thereof
11/14/2002US20020167384 Rotary variable differential transformer
11/13/2002CN1379418A Inductance element containing permanent magnet for bias magnet and its making method
11/12/2002US6480110 Inductively tunable antenna for a radio frequency identification tag
10/2002
10/31/2002US20020158711 Switched inductor/varactor tuning circuit having a variable integrated inductor
10/03/2002WO2002076289A2 Wireless system for measuring distension in flexible tubes
08/2002
08/20/2002US6437653 Method and apparatus for providing a variable inductor on a semiconductor chip
08/07/2002CN2504739Y Improved divider structure
07/2002
07/25/2002US20020097153 Inductively tunable antenna for a radio frequency identification tag
07/25/2002US20020097130 Transformer with controlled interwinding coupling and controlled leakage inductances and circuit using such transformer
07/25/2002DE10148040A1 Regelbarer Induktionsformator mit elektronischer Steuerung Adjustable Induktionsformator with electronic control
07/11/2002US20020088110 Coil and clamp for variable reluctance transducer
06/2002
06/13/2002US20020070837 Variable inductor
06/11/2002US6404320 Method for adjusting the inductance of an inductor
06/11/2002US6404319 Variable inductance element
06/06/2002WO2002045011A1 Inductively tunable antenna for a radio frequency identification tag
06/06/2002WO2002044647A2 Improved linear variable differential transformers for high precision position measurements
05/2002
05/21/2002US6392521 Variable inductance transformer with electronic control
05/09/2002US20020053901 Linear inductive fluid level sensor
05/02/2002US20020050894 Magnetic core and deflection yoke having the same
04/2002
04/11/2002WO2002029834A1 Linear inductive fluid level sensor
04/11/2002DE10047892A1 Steplessly variable inductance has inductance formed between terminals of main winding, while DC is supplied to auxiliary winding
04/09/2002US6369684 Variable inductor
04/09/2002US6369683 Variable inductor
04/04/2002WO2002027793A2 Method and apparatus for providing a variable inductor on a semiconductor chip
04/02/2002US6366034 Electric current variable-type inductor having closed loop characteristics and a horizontal linearity compensation circuit
03/2002
03/20/2002EP1188033A1 Electronic transducer for measuring flexion
03/19/2002US6359539 Magnetic core and deflection yoke having the same
02/2002
02/21/2002US20020021202 Method for adjusting the inductance of an inductor
02/12/2002CA2231825C Printed circuit transformer hybrids for rf mixers
02/06/2002EP1178500A1 Inductive integrated structure with split values on a semiconductor substrate
01/2002
01/31/2002US20020013134 Integrated structure of inductances with shared values on a semiconductor substrate
01/10/2002DE10117290A1 Variabler Drei-Anschluß-Induktor The three-terminal variable inductor
12/2001
12/20/2001US20010053616 Method and an apparatus for manufacturing multilayer electronic part
11/2001
11/01/2001US20010035808 Three-terminal variable inductor
10/2001
10/18/2001DE10117291A1 Variabler Induktor Variable inductor
10/11/2001US20010028292 Variable inductor
09/2001
09/20/2001DE10110950A1 Element mit variabler Induktivität und Verfahren zum Herstellen desselben Of the same variable inductance element and method for producing
08/2001
08/29/2001CN1070309C Adjustable saturable transformer
08/14/2001US6275131 Process for variable inductor using nickel titanium and placement
07/2001
07/05/2001DE10009825A1 Electrical coils arrangement e.g. for systems with two parallel coils, has parallel connected coils each laid out as two series-connected coils with center tap and bridge
07/04/2001EP1113464A2 Microgapping process for magnetic cores
07/04/2001EP1113463A1 Planar inductor
07/03/2001US6254738 Use of variable impedance having rotating core to control coil sputter distribution
06/2001
06/28/2001DE19963290A1 Planare Induktivität Planar inductor
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