Inventor · disambiguated record
John E. Grandfield
Also filed as: GRANDFIELD JOHN · GRANDFIELD JOHN E
11 granted patents·338 citations·filing 1986–2019
90Inventor score
Files withCHARLES STARK DRAPER LABORATORY INC3GTE GOVERNMENT SYST3DRAPER LAB CHARLES S1GRANDFIELD JOHN E1GTE SERVICE CORP1
Top patents by PatentIndex Score
11 records- 0192US8629811B2Dual band electrically small tunable antennaGRANDFIELD JOHN E·Filed 2011·Granted Jan 14, 2014·218 cites·14 claims
- 0281US10819321B1Switchable active balanced-to-unbalanced phase shifterZAIDEN DAVID MANUEL·Filed 2019·Granted Oct 27, 2020·8 cites·19 claims
- 0381US9899746B2Electronically steerable single helix/spiral antennaCHARLES STARK DRAPER LABORATORY INC·Filed 2014·Granted Feb 20, 2018·9 cites·16 claims
- 0480US8922452B1Periodic spiral antennasO'BRIEN JONATHAN MICHAEL·Filed 2014·Granted Dec 30, 2014·9 cites·16 claims
- 0570US10490897B1Frequency selective surface antenna elementCHARLES STARK DRAPER LABORATORY INC·Filed 2016·Granted Nov 26, 2019·2 cites·24 claims
- 0669US4791377ADirect frequency synthesizerGTE GOVERNMENT SYST·Filed 1987·Granted Dec 13, 1988·32 cites·3 claims
- 0766US5802452AMultiple channel radio frequency repeaterGTE GOVERNMENT SYST·Filed 1996·Granted Sep 1, 1998·42 cites·4 claims
- 0863US4757287AVoltage tunable half wavelength microstrip filterGTE SERVICE CORP·Filed 1987·Granted Jul 12, 1988·17 cites·4 claims
- 0955US9337533B2Ground plane meandering in Z direction for spiral antennaDRAPER LAB CHARLES S·Filed 2014·Granted May 10, 2016·1 cites·9 claims
- 1049US9748642B2Low-profile loop antennaCHARLES STARK DRAPER LABORATORY INC·Filed 2015·Granted Aug 29, 2017·0 cites·20 claims
- 1127US4727595ALocal oscillator feed for mixer arrayGTE GOVERNMENT SYST·Filed 1986·Granted Feb 23, 1988·0 cites·2 claims
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