Array antenna and electromagnetic wave device
US-2026005446-A1 · Jan 1, 2026 · US
Waffle-iron filters; Corrugated structures
Waffle-iron filters; Corrugated structures · Cooperative Patent Classification (CPC)
Electric circuits, power, telecommunications, and semiconductors.
Related technology areas
Mapped technology topics for this CPC code.
| Metric | Value |
|---|---|
| CPC code | H01P1/211 |
| Official title | Waffle-iron filters; Corrugated structures |
| Display label | Waffle-iron filters; Corrugated structures |
| Total patents | 43 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is rapidly declining.
| Year | Patents |
|---|---|
| 2015 | 2 |
| 2016 | 1 |
| 2017 | 4 |
| 2018 | 5 |
| 2019 | 3 |
| 2020 | 3 |
| 2021 | 5 |
| 2022 | 10 |
| 2023 | 5 |
| 2024 | 2 |
| 2025 | 2 |
| 2026 | 1 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
RF source protection
US-12414221-B2 · Sep 9, 2025 · US
Waffle iron filter arrangement for high-frequency signals
US-12347913-B2 · Jul 1, 2025 · US
Waveguide filters
US-12166257-B2 · Dec 10, 2024 · US
Heatpipe to help reduce radio frequency interference
US-12160216-B2 · Dec 3, 2024 · US
Waffle Iron Filter Arrangement For High-Frequency Signals
US-2023395961-A1 · Dec 7, 2023 · US
Rf source protection
US-2023380049-A1 · Nov 23, 2023 · US
High-frequency module
US-11749873-B2 · Sep 5, 2023 · US
Microwave or millimeter wave passive components or devices
US-2023109939-A1 · Apr 13, 2023 · US
Ridge gap waveguide and multilayer antenna array including the same
US-11626652-B2 · Apr 11, 2023 · US
Multi-mode resonator and quantum computing element including the same
US-2022271212-A1 · Aug 25, 2022 · US
Waveguide filters
US-2022263210-A1 · Aug 18, 2022 · US
Dielectric filter, array antenna device
US-11394095-B2 · Jul 19, 2022 · US
Hybrid-harmonic waveguide filter including corrugations coupled by ridge interconnects and having sloped transformer sections
US-11374298-B1 · Jun 28, 2022 · US
Tunable microwave system
US-11335985-B2 · May 17, 2022 · US
Multipaction-proof waveguide filter
US-11289784-B2 · Mar 29, 2022 · US
Additively manufactured radio frequency filter
US-11283143-B2 · Mar 22, 2022 · US
High-Frequency Module
US-2022029259-A1 · Jan 27, 2022 · US
Multipaction-proof waveguide filter
US-2022013878-A1 · Jan 13, 2022 · US
Waveguide filter
US-11223095-B2 · Jan 11, 2022 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC H01P1/211?
- CPC H01P1/211 is the Cooperative Patent Classification code for “Waffle-iron filters; Corrugated structures.”
- How many patents are filed under CPC H01P1/211 (Waffle-iron filters; Corrugated structures)?
- Our database includes 43 publications tagged with this CPC code.
- Is patent activity under CPC H01P1/211 growing?
- Publication counts under this code: 2 in 2024 vs 2 in 2025 (latest complete years).