H01P 1/20
Frequency-selective devices
Official title: Frequency-selective devices, e.g. filters
H01P1/20 (Frequency-selective devices) appears on 5,032 US grants and 3,964 published applications in this corpus.
Search patents in H01P- Granted patents
- 5,032
- Published applications
- 3,964
- Assignees
- 1,348
- Inventors
- 7,135
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 16 | 0 |
| 1977 | 20 | 0 |
| 1978 | 23 | 0 |
| 1979 | 27 | 0 |
| 1980 | 26 | 0 |
| 1981 | 43 | 0 |
| 1982 | 20 | 0 |
| 1983 | 17 | 0 |
| 1984 | 40 | 0 |
| 1985 | 35 | 0 |
| 1986 | 41 | 0 |
| 1987 | 48 | 0 |
| 1988 | 52 | 0 |
| 1989 | 50 | 0 |
| 1990 | 39 | 0 |
| 1991 | 56 | 0 |
| 1992 | 56 | 0 |
| 1993 | 62 | 0 |
| 1994 | 68 | 0 |
| 1995 | 62 | 0 |
| 1996 | 77 | 0 |
| 1997 | 58 | 0 |
| 1998 | 106 | 0 |
| 1999 | 108 | 0 |
| 2000 | 135 | 0 |
| 2001 | 128 | 55 |
| 2002 | 148 | 189 |
| 2003 | 196 | 181 |
| 2004 | 161 | 162 |
| 2005 | 138 | 148 |
| 2006 | 106 | 119 |
| 2007 | 98 | 142 |
| 2008 | 105 | 131 |
| 2009 | 100 | 155 |
| 2010 | 109 | 175 |
| 2011 | 118 | 146 |
| 2012 | 135 | 164 |
| 2013 | 103 | 128 |
| 2014 | 150 | 151 |
| 2015 | 178 | 170 |
| 2016 | 157 | 166 |
| 2017 | 201 | 168 |
| 2018 | 184 | 188 |
| 2019 | 184 | 169 |
| 2020 | 186 | 190 |
| 2021 | 161 | 165 |
| 2022 | 157 | 200 |
| 2023 | 120 | 160 |
| 2024 | 151 | 152 |
| 2025 | 167 | 102 |
| 2026 | 106 | 88 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
- H01P 1/201Filters for transverse electromagnetic waves2,853
- H01P 1/207Hollow waveguide filters1,183
- H01P 1/213Combining or separating two or more different frequencies1,052
- H01P 1/2005Electromagnetic photonic bandgaps [epb], or photonic bandgaps [pbg]260
- H01P 1/2002Dielectric waveguide filters210
- H01P 1/215Using ferromagnetic material172
- H01P 1/2007Filtering devices for biasing networks or dc returns81
- H01P 1/212Suppressing or attenuating harmonic frequencies68
All 9 subgroupsShow fewer
Recent patents
- Waveguide element operable up to terahertz frequencies including a dielectric portion having periodic holes of a specified period formed therein and which is mounted on a support substrate6 Oct 2026US 12,756,080 B2NGK Insulators, Ltd.
- Filter6 Oct 2026US 12,756,081 B2Soshin Electric Co., Ltd.
- Notch filter6 Oct 2026US 12,756,082 B2Inter-University Research Institute Corporation National Institutes of Natural Sciences
- Waveguide device operable up to terahertz frequencies including a line substrate having periodic holes formed therein and which is mounted on a support substrate29 Sep 2026US 12,749,785 B2NGK Insulators, Ltd.
- Coaxial filter including bent high impedance segments and low impedance segments with bypass grooves29 Sep 2026US 12,749,786 B2Suzhou Luxshare Technology Co., Ltd.
- Cavity Filter and Communication Device1 Oct 2026US 2026/0302582 A1
- Frequency multiplexer suitable for quantum computing24 Sep 2026US 2026/0289370 A1QET Sweden AB
- Magnetostatic wave resonator based scanning filter24 Sep 2026US 2026/0291460 A1BAE Systems Information and Electronic Systems Integration Inc.
- Printed filter17 Sep 2026US 2026/0280508 A1Wnc Corporation
- Method and apparatus for supporting optimization of output power in communication system17 Sep 2026US 2026/0280592 A1Samsung Electronics Co., Ltd.
Most cited
By later US patents
- Electromagnetic transmission line elements having a boundary between materials of high and low dielectric constants634US 5,889,449 ASpace Systems/Loral, Inc. · 1999
- Magnetic coupling device and methods for use therewith475US 9,793,954 B2AT&T Intellectual Property I, L. P. · 2017
- Apparatus and methods for communicating utilizing an antenna array364US 10,148,016 B2AT&T Intellectual Property I, L. P. · 2018
- System and method for dual-band antenna matching340US 7,180,467 B2Kyocera Wireless Corp. · 2007
- High quality-factor tunable resonator296US 6,452,465 B1M-Squared Filters, LLC · 2002