John E. Grandfield
11Patents
5h-index
16Co-inventors
63Inventor score
Filing activity: Aug 1, 1986 → Jun 27, 2019
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US8629811B2 | Dual band electrically small tunable antenna | Electricity | 215 | Active |
| US5802452A | Multiple channel radio frequency repeater | Electricity | 18 | Expired |
| US4791377A | Direct frequency synthesizer | Electricity | 18 | Expired |
| US4757287A | Voltage tunable half wavelength microstrip filter | Electricity | 7 | Expired |
| US8922452B1 | Periodic spiral antennas | Electricity | 6 | Active |
| US9899746B2 | Electronically steerable single helix/spiral antenna | Electricity | 5 | Active |
| US10819321B1 | Switchable active balanced-to-unbalanced phase shifter | Electricity | 1 | Active |
| US10490897B1 | Frequency selective surface antenna element | Electricity | 1 | Active |
| US9337533B2 | Ground plane meandering in Z direction for spiral antenna | Electricity | 1 | Active |
| US9748642B2 | Low-profile loop antenna | Electricity | 0 | Active |
| US4727595A | Local oscillator feed for mixer array | Electricity | 0 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.