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Class Information
Number: 333/168
Name: Wave transmission lines and networks > Coupling networks > Frequency domain filters utilizing only lumped parameters > Including recurrent sections
Description: Subject matter wherein similar or equivalent elements or groups of elements are cascaded.
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7468642 |
Multi band pass filters |
Dec. 23, 2008 |
| 7348866 |
Compact printed filters with self-connected LC resonators |
Mar. 25, 2008 |
| 7348931 |
Unbalanced power feeding antenna device for making radio communications |
Mar. 25, 2008 |
| 7262674 |
Bandpass filter having first and second serially coupled collection of filter components for providing upper and lower rejection notches |
Aug. 28, 2007 |
| 7078986 |
Symmetrical polyphase network |
Jul. 18, 2006 |
| 6949988 |
Constant impedance filter |
Sep. 27, 2005 |
| 6608536 |
Constant impedance filter |
Aug. 19, 2003 |
| 6529100 |
Polyphase filter and receiver using the same |
Mar. 4, 2003 |
| 6473510 |
AC power source filter for audio video electrical load |
Oct. 29, 2002 |
| 6438394 |
Frequency dependent inductor apparatus and method for a narrow-band filter |
Aug. 20, 2002 |
| 6317016 |
Method and arrangement for gyration filtering with low power consumption |
Nov. 13, 2001 |
| 6170154 |
Printed lumped element stripline circuit structure and method |
Jan. 9, 2001 |
| 5973579 |
Ladder type intermediate frequency filter |
Oct. 26, 1999 |
| 5793265 |
Compact diplexer |
Aug. 11, 1998 |
| 5770983 |
Reduced length tuned filter having transverse oriented coils |
Jun. 23, 1998 |
| 5625894 |
Switch filter having selectively interconnected filter stages and ports |
Apr. 29, 1997 |
| 5616539 |
High temperature superconductor lumped element band-reject filters |
Apr. 1, 1997 |
| 5576673 |
Small, low-pass filter for high power applications |
Nov. 19, 1996 |
| 5574413 |
Tunable filter having a capacitive circuit connected to ground |
Nov. 12, 1996 |
| 5359315 |
Method of forming a three-layer structural spiral inductor |
Oct. 25, 1994 |
| 5355533 |
Method and circuit for radio frequency signal detection and interference suppression |
Oct. 11, 1994 |
| 5175518 |
Wide percentage bandwidth microwave filter network and method of manufacturing same |
Dec. 29, 1992 |
| 5166621 |
Multi-resonant NMR coils |
Nov. 24, 1992 |
| 5107233 |
Amplitude correction of field coupled varactor tuned filters |
Apr. 21, 1992 |
| 5072200 |
Combination of active and passive filters |
Dec. 10, 1991 |
| 5042085 |
Radio frequency data communication band pass filter |
Aug. 20, 1991 |
| 5004991 |
Low pass filter system for an electrical circuit |
Apr. 2, 1991 |
| 4961059 |
Combined RFI rejection and intergrating two-section filter |
Oct. 2, 1990 |
| 4881050 |
Thin-film microwave filter |
Nov. 14, 1989 |
| 4794353 |
Dissipative low-pass filter |
Dec. 27, 1988 |
| 4737744 |
Integrated capacitors for forming components of bandpass filters |
Apr. 12, 1988 |
| 4733205 |
Electrical filter |
Mar. 22, 1988 |
| 4714905 |
SMC filter and method of manufacture thereof |
Dec. 22, 1987 |
| 4672337 |
VLF/HF EMI filter |
Jun. 9, 1987 |
| 4667173 |
Line filter |
May. 19, 1987 |
| 4622522 |
Track circuit for AC electrified railways |
Nov. 11, 1986 |
| 4542524 |
Model and filter circuit for modeling an acoustic sound channel, uses of the model, and speech synthesizer applying the model |
Sep. 17, 1985 |
| 4507725 |
Digital filter overflow sensor |
Mar. 26, 1985 |
| 4437075 |
Self-corrected electric filters |
Mar. 13, 1984 |
| 4423396 |
Bandpass filter for UHF band |
Dec. 27, 1983 |
| 4409569 |
Filter circuits having transformers as filter elements |
Oct. 11, 1983 |
| 4395688 |
Linear phase filter with self-equalized group delay |
Jul. 26, 1983 |
| 4363009 |
L-C Filter with impedance transformers |
Dec. 7, 1982 |
| 4272743 |
Method for tuning a filter circuit |
Jun. 9, 1981 |
| 4118678 |
Coil retaining case |
Oct. 3, 1978 |
| 4074212 |
Multisection filter using inflected amplitude change function to sharpen its band-edge responses |
Feb. 14, 1978 |
| 4068311 |
Discrete transform systems using permuter memories |
Jan. 10, 1978 |
| 4063201 |
Printed circuit with inductively coupled printed coil elements and a printed element forming a mutual inductance therewith |
Dec. 13, 1977 |
| 4057771 |
Frequency-response corrective network |
Nov. 8, 1977 |
| 4048593 |
Electrical component for providing integrated inductive-capacitive networks |
Sep. 13, 1977 |
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