| F | Fahrenheit or Farad | Temperature scale named after a dead Deutsche guy (not a Dutch guy, thanks Laurens!), or a unit of capacitance named after a dead Brit who is a member of our Microwave Hall of Fame! |
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| FB | feedback | -- |
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| FBMC | filter bank multi carrier | -- |
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| FCC | Federal Communications Commission | -- |
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| FDD | frequency division duplex | -- |
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| FDMA | frequency division multiple access | -- |
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| FDSOI | fully depleted silicon-on-insulator | A method of isolating silicon circuits from silicon body of an integrated circuit. |
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| FDTD | finite difference time domain | A computational electromagnetics approach for solving realistic EM problems, popularized by Prof. Allen Taflove of Northwestern University. |
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| FEA | finite element analysis | Used in simulating electromagnetic fields. |
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| FER | Front end receiver OR frame error rate, depending on the context. | A semiconductor device. |
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| FET | field-effect transistor | A semiconductor device. |
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| FF | femto-farad | A unit of capacitance, 10E-15 farads. |
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| FF | Far field | A type of antenna measurement |
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| FFS | final frontside | MMIC wafers often have DC data measured prior to flipping the wafer for backside processing. |
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| FFT | fast Fourier transform | The Fourier transform is what allows you to go between frequency and time domains. |
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| FGCPW | finite groundplane coplanar waveguide | Coplanar waveguide, with narrow ground strips. Not the same thing as CBCPW! |
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| FIR | finite impulse response (filter) | -- |
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| FIT | finite integration technique | -- |
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| FM | frequency modulation | Transferring information by varying the carrier frequency. The broadcast radio band with "no static at all". |
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| FMAX | maximum frequency | The maximum frequency at which you can get power gain from a transistor. |
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| FMCW | frequency modulated continuous wave | A type of radar waveform. |
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| FMIN | minimum noise figure of a device | Used in low noise amplifier design. |
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| FOD | foreign object/debris | Unwanted stuff that accidentally finds its way into hardware during manufacturing. Food, tools, ty-wraps... things that could cause a disaster after delivery to your customer. |
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| FP | Field plate | Used in GaN HEMTs to reduce peak electric field in channel |
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| FR-4 | fire-retardant 4 | A glass-resin PWB material. |
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| FS | field strength | Magnitude of an electromagnetic field. |
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| FSK | frequency shift keying | -- |
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| FSR | full sheet resonance | A method for measuring dielectric constant of a circuit board. |
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| FSS | frequency-selective surface | A substrate with a metal pattern that passes energy at one frequency but blocks it at another. |
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| FT | feet | Unit of length used by Yankees. |
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| FT | transition frequency | The frequency at which the gain of a transistor is 0dB. |
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| FTP | file transfer protocol | -- |
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| FUBAR | f***ed up beyond all repair | One of the two excellent acronyms that are the legacy of the greatest generation (see snafu) |
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