H03F 1/56
Modifications of input or output impedances, not otherwise provided for
H03F1/56 (Modifications of input or output impedances, not otherwise provided for) appears on 3,640 US grants and 4,070 published applications in this corpus.
Search patents in H03F- Granted patents
- 3,640
- Published applications
- 4,070
- Assignees
- 858
- Inventors
- 4,960
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 5 | 0 |
| 1977 | 4 | 0 |
| 1978 | 1 | 0 |
| 1979 | 1 | 0 |
| 1980 | 4 | 0 |
| 1981 | 7 | 0 |
| 1982 | 6 | 0 |
| 1983 | 6 | 0 |
| 1984 | 4 | 0 |
| 1985 | 12 | 0 |
| 1986 | 5 | 0 |
| 1987 | 4 | 0 |
| 1988 | 6 | 0 |
| 1989 | 10 | 0 |
| 1990 | 7 | 0 |
| 1991 | 7 | 0 |
| 1992 | 5 | 0 |
| 1993 | 7 | 0 |
| 1994 | 13 | 0 |
| 1995 | 8 | 0 |
| 1996 | 5 | 0 |
| 1997 | 3 | 0 |
| 1998 | 8 | 0 |
| 1999 | 21 | 0 |
| 2000 | 23 | 0 |
| 2001 | 32 | 7 |
| 2002 | 26 | 61 |
| 2003 | 25 | 31 |
| 2004 | 50 | 42 |
| 2005 | 42 | 61 |
| 2006 | 48 | 42 |
| 2007 | 40 | 61 |
| 2008 | 51 | 99 |
| 2009 | 60 | 74 |
| 2010 | 70 | 78 |
| 2011 | 77 | 101 |
| 2012 | 101 | 116 |
| 2013 | 123 | 120 |
| 2014 | 109 | 158 |
| 2015 | 147 | 199 |
| 2016 | 194 | 232 |
| 2017 | 242 | 238 |
| 2018 | 257 | 266 |
| 2019 | 288 | 265 |
| 2020 | 241 | 283 |
| 2021 | 216 | 285 |
| 2022 | 227 | 265 |
| 2023 | 181 | 288 |
| 2024 | 210 | 281 |
| 2025 | 222 | 229 |
| 2026 | 179 | 188 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Data storage device with BiCMOS impedance-matched amplifier with transducer-bias6 Oct 2026US 12,755,754 B1Western Digital Technologies, Inc.
- Matching network for a power amplifier6 Oct 2026US 12,756,366 B2QUALCOMM Incorporated
- Power amplifier and radio frequency module6 Oct 2026US 12,756,368 B2Mitsubishi Electric Corporation
- Tunable transconductor6 Oct 2026US 12,756,369 B2Texas Instruments Incorporated
- Fully integrated CMOS multiple MOSFET-stacked double push-pull RF power amplifier29 Sep 2026US 12,750,012 B2Shanghai WUQI Microelectronics Co., Ltd.
- Doherty power amplifiers with controllable capacitor for tuning harmonic termination and inverter8 Oct 2026US 2026/0312543 A1Skyworks Solutions, Inc.
- Load impedance circuit for amplifier8 Oct 2026US 2026/0312545 A1STMicroelectronics International N. V.
- Power amplifier systems with load control8 Oct 2026US 2026/0312548 A1Skyworks Solutions, Inc.
- Stability circuits and methods for power amplifiers8 Oct 2026US 2026/0312549 A1Skyworks Solutions, Inc.
- Rfic with substrate partition8 Oct 2026US 2026/0312551 A1Taiwan Semiconductor Manufacturing Company.Ltd
Most cited
By later US patents
- System and method for dual-band antenna matching340US 7,180,467 B2Kyocera Wireless Corp. · 2007
- Power feeding apparatus, power receiving apparatus, wireless power feeding system and method for wireless transfer of power274US 9,006,934 B2Sony Corporation · 2015
- Tunable horn antenna238US 6,867,744 B2Kyocera Wireless Corp. · 2005
- Apparatus and methods for envelope tracking202US 8,718,188 B2Skyworks Solutions, Inc. · 2014
- Method and apparatus for linear amplification of a radio frequency signal198US 6,449,465 B1Motorola, Inc. · 2002