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FANS              future air navigation system

FAR                false alarm rate

FBAR             film bulk acoustic wave resonator

FBW               fractional bandwidth

FCA                flip-chip assembly

FCC                Federal Communications Commission

FCS                 frame check sequence

FDD                frequency-division duplexing

FDDI              fiber-distributed data interface

FDFD              finite difference frequency domain

FDM               frequency division multiplex

FDMA            frequency division multiple access

FDR                frequency domain reflectometry

FDTD              finite difference time domain

FEA                field emitter arrays

FEC                 forward error correction

FEM                finite element method

FEM                front-end modules

FEP                 fluoroethylene propylene

FEQ                frequency-domain equalizer

FER                 frame error rate

FET                 field effect transistor

FFI                  fixed frequency interleaving

FFO                 fixed-frequency oscillator

FFT                 fast Fourier transform

FGC                finite ground coplanar

FH                   frequency hopping

FHMA             frequency hop multiple access

FHSS              frequency-hopping spread spectrum

FIR                  finite-duration impulse response (filter)

FIT                  failures in time

FLC                 ferroelectric liquid crystals

FLOP              floating octal points

FLR                 forward looking radar

FM                  frequency modulation

FMC                fixed mobile convergence (service)

FMCW            frequency-modulated continuous wave (radar)

FO                   fiber-optic

FOBP              fractional out-of-band power

FPLMTS         Future Public Land Mobile Telecommunication Systems

FPGA              field-programmable gate array

FRA                fixed radio access

FS                    free space

FSCS               frequency-selective conducting surface

FSK                 frequency shift keying

FSS                 fixed satellite service

 FSS                 frequency-selective surface