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ACRONYNMS
Common and Useful Acronyms, Courtesy of Microwave Journal
ACRONYMS & ABBREVIATIONS
AACI alternative adjacent channel interference
AC asynchronous connectionless
ACA anisotropic conductive adhesive
ACC adaptive cruise control
ACIR adjacent channel interference ratio
ACLR adjacent channel leakage ratio
ACMPA aperture-coupled microstrip patch antenna
ACP adjacent channel power
ACPR adjacent channel power rejection
ACPR adjacent channel protection ratio
ACPW asymmetrical coplanar waveguide
ACW autonomous collision warning (system)
ADC analog-to-digital converter
ADEOS advanced Earth observation satellite
ADPCM adaptive differential pulse-code modulation
ADS automatic debiting system (auto toll collecting)
ADSL asymmetric digital subscriber loop
AEGIS airborne early warning ground integration system
AFH adaptive frequency hopping
AFP automatic frequency planning
AGC automatic gain control
AICC autonomous intelligent cruise control
AM amplitude modulation
AM analog metal
AME average model error
AMF automated module fabrication
AML amplitude modulated link
AMPS Advanced Mobile Phone Service
AMR adaptive multirate codex
ANA automatic network analyzer
ANSI American National Standards Institute
AO acoustic-optical
AP access points
APC American Personal Communications system
API application programming interface
APL airport pseudolites
AR axial ratio
ARBF adaptive radial basis function
ARM antiradiation missile
ARMA autoregressive moving average
ARDIS Advanced Radio Information Service
ARFCN absolute radio frequency channel number
ARO active resonator oscillator
ARQ automatic repeat request
ASAP Airborne Shared Aperture Program
ASCII American National Standard Code for Information Interchange
ASIC application specific integrated circuit
ASH amplifier-sequenced hybrid
ASK amplitude shift keying
ASM antenna switch module
ASTM American Society for Testing and Materials
ASV advanced safety vehicle (system)
ATC air traffic control
ATDE adaptive time domain equalizer
ATE automatic test equipment
ATM asynchronous transfer mode
ATM air traffic management
ATPC automatic transmit power control
ATR antenna test range
AUC authentication center
AVI automatic vehicle identification
AVL automatic vehicle location
AVLN automatic vehicle location and navigation system
AWG arbitrary waveform generator
AWG American Wire Gauge (standard)
AWGN additive white Gaussian noise
AWNV all weather and night vision system
BAW bulk acoustic wave
BCB benzo-cyclobutene
BCD binary-coded decimal
BCH broadcast channel
BCM block-coded modulation
BER bit error rate
BERT bit error rate tester
BEM boundary element method
BFL buffered field-effect transistor logic
BFN beam-forming network
BiCMOS bipolar complementary metal-oxide semiconductor
BIFODEL binary fiber-optic delay line
BIST built-in self test
BJT bipolar junction transistor
BLOS beyond line-of-sight
BNC Bayonet Navy Connector
BNC Bayonet N-type Connector
BOM bill of materials
BOR body of revolution
BPSK bi-phase shift keying or binary phase shift keying
BSC base station controller
BSS base station system
BSS broadcast satellite service
BT bandwidth-time product
BTS base transceiver station
BZ Brillouin zone
C-AFM calibrated atomic force microscope
C/A clear and acquisition code (GPS)
CAE computer-aided engineering
CALLUM combined analog locked loop universal modulator
CATV community antenna television
CBCPS conductor-backed coplanar stripline
CB-CPW conductor-backed coplanar waveguide
CBS cavity-backed slot
CCA circuit card assembly
CCA clear channel assessment
CCD charge-coupled device
CCDF complementary cumulative distribution function
CCK complementary code keying
CCMT computer-controlled microwave tuner
CCPR co-channel power ratio
CDF cumulative distribution function
CDMA code-division multiple access
CDPD cellular digital packet data
CE Conformite Europeene (European EMC standard)
CEPT Conference on European Posts and Telecommunications administrations
CFC chloroflourocarbon
CFR Code of Federal Regulations
C/I carrier-to-interference ratio
C/I carrier-to-intermodulation ratio
CIC controller in charge
CIM computer integrated manufacturing
CIR carrier-to-interference ratio
CMOS complementary metal-oxide semiconductor
CMP chemical-mechanical polishing
CMRF combined mode resonator filter
CMRR common mode rejection ratio
CMS combined symbol matching
C/N carrier-to-noise ratio
CNC computerized numerical control
CNR carrier-to-noise ratio
CNS/ATM Communication and Surveillance/Air Traffic Management
COFDM coded orthogonal frequency division multiplex
COHO coherent oscillator
COM Component Object Model
COMINT communications intelligence
CONUS continental/contiguous United States
COPS complex operations per second
COTS commercial off-the-shelf
CP cyclic prefixes
CPCI compact protocol control information
CPE customer premises equipment
CPFSK continuous phase frequency shift keying
CPM continuous phase modulation
CPS coplanar stripline
CPU central processing unit
CPW coplanar waveguide
CQFP ceramic quad flat pack
CRC cyclic redundancy check
CREAM cosmic radiation effects and activation monitors
CRTSSDA cascaded reactively terminated single-stage distributed amplifier
CSL coupled-slot antenna
CSM combined symbol matching
CSMA/CD carrier sense multiple access/collision detection
CSO composite second order
CSP chip scale package
CSSDA cascade single stage distributed amplifier
CT cordless telephone
CT-2 cordless telephones-second generation
CTB composite triple beat
CTE coefficient of thermal expansion
CTM conformal transformation method
CTR common technical regulations
CVD chemical vapor deposition
CVDL continuously variable delay line
CVSD continuously variable slope delta
CW continuous wave
CWSA constant width slot antenna
DAB digital audio broadcast
DAC digital-to-analog converter
DAMA demand-assigned multiple access
D-AMPS Digital Advanced Mobile Phone Service
DAQ data acquisition
DAWS Digital Advanced Wireless Service
DBF digital beamforming
DBS direct broadcast service
DBS direct broadcast satellite
DCFL direct-coupled field-effect transistor logic
DCOM Distributed Component Object Model
DCR downconverting receiver
DCR direct conversion receiver
DCS1800 digital communication system at 1800 MHz
DCXO digitally compensated crystal oscillator
DDS direct digital synthesis
DEBS dynamic electronic bias system
DECT Digital European Cordless Telecommunications (1880 to1900 MHz)
DECT Digital Enhanced Cordless Telephony (new name)
DESC Defense Electronic Supply Center
DEVM differential error vector magnitude
DF direction finding
DFB distributed feedback
DFD digital frequency discriminator
DF dissipation factor
D-FET depletion-mode field-effect transistor
DFN dual flat no-lead (package)
DFT design for test
DFT discrete Fourier transform
DGPS Differential Global Positioning System
DGS defected ground structure
DHBT double-heterojunction bipolar transistor
DIFM digital instantaneous frequency measurement
DIMM dual in-line memory module
DIN Deutsche Industrial Norms (German standards agency)
DLRU decoy launch/recovery unit
DLVA detector log video amplifier
DMO direct mode operation
DMOS diffused metal-oxide semiconductor
DMR dual-mode resonators
DMSP Defense Meteorological Satellite Program
DMT digital multiplexed trunk
DMUX demultiplexer
DNL dynamic nonlinearity
DoA direction of arrival
DPCCH dedicated physical control channel
DPDCH dedicated physical data channel
DPHEMT double heterojunction pseudomorphic high electron mobility transistor
DPLL digital phase-locked loop
DPSK differential phase shift keying
DQPSK differential quadrature phase-shift keying
DRFM digital radio frequency memory
DRA dielectric resonator antenna
DRO dielectric resonator oscillator
DRRS digital radio relay system
DS direct sequence
DSC differential scanning calorimetry
DSO digital storage oscilloscope
DSP digital signal processing
DSSS direct sequence spread spectrum
DTCXO digital temperature-compensated crystal oscillator
DTF distance-to-fault
DTH direct to home
DTMF dual-tone multiple frequency
DTO digital test oscilloscope
DTO digitally tuned oscillator
DTX discontinuous transmission
DUT device under test
DVB digital video broadcasting
DWC digital wireless communications
DWDM dense wavelength division multiplexing
EBG electromagnetic bandgap
EBL electron beam lithography
EBSD electron backscatter diffraction
EC European Community
ECB enhanced cellular base station
ECC error correction code
ECC embedded communication channel
ECL emitter-coupled logic
ECM electronic countermeasures
ECSD enhanced circuit switched data
ED electrodeposited
E/D enhancement/depletion (mode)
EDA electronic design automation
EDFA erbium-doped fiber amplifier
EDGE Enhanced Data Rate for GSM Evolution
EDM electronic discharge machining
EDR enhanced data rate
EEA EU and EFTA merge unit
EEC European Economic Community
EEPROM electrically erasable programmable read-only memory
EER envelope elimination and restoration
E-FET enhancement-mode field-effect transistor
EFIE electric field integral equation
EFTA European Free Trade Area (Austria, Finland, Liechtenstein, Norway, Sweden and Switzerland)
EGI embedded global positioning satellite inertial navigation system
EGP effective ground path
EGPRS Enhanced General Packet Radio System
EGSM European Digital Extended Group Special Mobile
EHF extremely high frequency (30 to 300 GHz)
EHTPS extra high tension power supply
EIA/TIA Electronics Industry Association/Telecommunications Industry
Association
EIN equivalent input noise
EIR equipment identity register
EIRP effective isotropic radiated power
EIS effective isotropic sensitivity
ELINT electronic intelligence systems
EM electromagnetic
EMC electromagnetic compatibility
EMF electromotive force
EMI electromagnetic interference
EML electroabsorption-modulated laser
EMR electromagnetic radiation
EN European Norm (EMI regulations)
ENG electronic news gathering
ENR excess noise ratio
EPFD equivalent power-flux density
EPROM erasable programmable read-only memory
ERMES European radio message system
ERP effective radiated power
ESD electrostatic discharge
ESL equivalent series inductance
ESM electronic support measure
ESMR extended specialized mobile radio
ESR electron spin resonance
ESR equivalent series resistance
ETACS Extended Total Access Communications System (British cellular)
ETC electronic toll collecting
ETL embedded transmission line
ETRF electronically tuned RF (filter)
ETS European Telecommunications Standard
ETSI European Telecommunications Standard Institute
ETTM electronic toll and traffic management
EU European Union
EUT equipment under test
EUTELSAT European Telecommunications Satellite
EUV extreme-ultraviolet
EVM error vector magnitude
EW electronic warfare
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
FEP fluoroethylene propylene
FER frame error rate
FET field effect transistor
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
GAM Global Positioning System-aided munitions
GBAS ground-based augmentation systems
GBR ground-based radar
GCPW grounded coplanar waveguide
GEO geostationary earth orbit
GFSK Gaussian frequency shift keying
GLONASS Global Navigation Satellite System (Russian)
GMDSS Global Maritime Distress Signal System
GMSK Gaussian minimum shift keying
GNSS Global Navigation Satellite System (US)
GOT gate oxide transistor
GPIB general purpose interface bus
GPR ground penetrating radar
GPRS General Packet Radio Service
GPS Global Positioning System/Satellite
GSM Global System for Mobile Communications
GSM-900 Group Speciale Mobile (European GSM)
GSO geostationary orbit
G/T receive antenna gain divided by noise temperature
GTEM Gigahertz Transverse Electromagnetic Mode (cell)
GTRD generalized transverse resonance diffraction
GUI graphical user interface
HARM high speed anti-radiation missile
HBT heterojunction bipolar transistor
HDI high density interconnect
HDSL high-bit-rate digital subscriber line
HDTV high definition television
HEMT high electron mobility transistor
HEO high elliptical orbit (satellite)
HFC hybrid fiber/coax
HFET heterostructure field-effect transistor
HFSS high frequency structure simulator
HGA high gain antenna
HIPERLAN high performance local area network
HJFET heterojunction field-effect transistor
HLR home location register
HMIC hybrid microwave integrated circuit
HPA high power amplifier
HPBW half power beam width
HPSK hybrid phase shift keying
HSCSD high speed circuit switched data
HSDPA high speed downlink packet access
HTS,HTSC high temperature superconductor
IBIC interface bus interactive control
IBOC in-band on-channel
IBW instantaneous bandwidth
IC integrated circuit
ICI intercarrier interference
ICIR intrinsic carrier-to-interference ratio
ICSP in circuit serial programming (interface)
ICW interrupted continuous wave
IDECM integrated defense electronic countermeasures
IDFT inverse discrete Fourier transform
IDL inductive loop detectors
IDT interdigital transducer
IEC International Electrotechnical Commission
IEP ideal electric plane
IF intermediate frequency
IFB indirect feedback
IFF identification friend or foe
IFFT inverse fast Fourier transform
IFM instantaneous frequency measurement
IGBT insulated gate bipolar transistor
IGFET insulated gate field effect transistor
IIR infinite impulse response (filter)
ILA injection-locked amplifier
ILO injection-locked oscillator
IM intermodulation
IMD intermodulation distortion
IMDN Intelligent Mobile Data Network
IMEI international mobile equipment identity
IMFET internally matched field-effect transistor
IMP intermodulation products
IMPATT impact avalanche and transit time
IMR intermodulation rejection
IMSI international mobile subscriber identity
INMARSAT International Maritime Satellite consortium, London
INS inertial navigation system
INTELSAT International Telecommunication Satellite consortium, Washington
IOR input-output ratio
IP Internet Protocol
IPBO input power backoff
IPC Institute for Interconnecting and Packaging Electronic Circuits
IPD integrated passive device
IPS integrated power systems
IQ in-phase/quadrature
IR infrared
IR insulation resistance
IRA impulse radiating antennas
IRM image reject mixer
IS-95 North American cellular standard
ISAR inverse synthetic-aperture radar
ISDN integrated services digital network
ISF impulse sensitivity function
ISI intersymbol interference
ISM industrial, scientific and medical (frequency bands)
ISO International Standards Organization
ITR interrogator
ITS intelligent transportation systems
ITM-2000 International Mobile Telecommunication 2000
ITU International Telecommunication Union
ITU-R ITU Radio Communications Sector
IVHS Intelligent Vehicle Highway System
JDC Japanese Digital Cellular system
JEDEC Joint Electron Device Engineering Council
JFET junction field effect transistor
JPEG Joint Picture Expert Group (compression standard)
JTAG joint test action group
KGD known good die
KSIR Kirchhoff’s surface integral representation
LAN local area network
LAAS local area augmentation systems
LAO LaAlO3 (substrate)
LBC linked boundary condition
LC inductor/capacitor
LCC leadless chip carrier
LCD liquid crystal display
LD laser diode
LDMOS laterally diffused metal oxide semiconductor
LEC liquid encapsulated Czochralski (semi-insulating substrates)
LEO low earth orbit (satellite)
LEP lumped element prototype
LHCP left-hand circular polarization
LIDAR light direction and ranging
LIGA Lithographie, Galvanoformung und Abformung (German: lithography, electroplating and molding)
LINC linear amplification with nonlinear components
LMCS local multi-point communications system
LMDS local multi-point distribution system
LMS least mean square
LMS location and monitoring services
LNA low noise amplifier
LNB low noise block
LNBF low noise block feed
LO local oscillator
LOS line of sight
LPE low pass equivalent
LPF low pass filter
LPI low probability of intercept
LQI link quality indication
LRL line-reflect-line (calibration)
LRRM line-reflect-reflect-match (calibration)
LSB least significant bit
LSG large signal gain
LSI large scale integration
LTCC low temperature co-fired ceramic
LTCC-M low temperature co-fired ceramic on metal core
LTI linear time invariant
LTP long term predictor
LTS long training symbol
LTSA linear taper slot antenna
LUT look-up table
LVDS low voltage differential signal
MAC medium access control
MAFET Microwave and Analog Front End Technology project
MBA multi-beam antenna
MBE molecular beam epitaxy
MBOA Multiband OFDM Alliance
MBPA multi-beam phased array
MCE manufacturing cycle efficiency
MCF message communication function
MCL microstrip constrained lens
MCM multi-carrier modulation
MCM multi-chip module
MCM-C multi-chip module with co-fired substrate
MCM-D multi-chip module with deposited substrate
MCPA multi-carrier power amplifier
MCPW microstrip coplanar waveguide
MCSSS multi-coupled suspended substrate stripline
MCT metal-oxide semiconductor-controlled thyristor
MDS multi-point distribution system
MEADS medium extended air defense system
MEMS microelectromechanical system
MESFET metal-semiconductor field effect transistor
MEO medium earth orbit (satellite)
MFGC micromachined finite ground coplanar
MIC microwave integrated circuit
MIC monolithic integrated circuit
MID molded interconnect device
MIDAS multiple integration and defense communications satellite network
MIM metal-insulator-metal (capacitor)
MIMIC Millimeter-wave and Microwave Integrated Circuit (R&D program)
MIMO multiple input multiple output
MIPS million instructions per second
MIR microwave impulse radar
MLA microwave link analyzer
MLB multi-layer board
MLC main lobe clutter
MLCM multilevel coded modulation
MLDD matched-line directional divider
MMC metal-matrix composite
MMCA microwave multi-chip assembly
MMDS multi-channel multi-point distribution system
MMI man-machine interface
MMI multimedia interface
MMIC microwave monolithic integrated circuit
MMW millimeter wave
MOCVD metal-organic chemical vapor deposition
MOCT multi-order cancellation technique
MODEM modulator/demodulator
MODFET modulation-doped field effect transistor
MoM method of moments
MOS metal-oxide semiconductor
MPA microstrip patch antenna
MPE maximum permissible exposure
MPEG Motion Picture Experts Group
MPIE mixed potential integral equation
MPM microwave power module
MPSK multiple phase-shift keying
MQAM M-order quadrature amplitude modulation
MQW multi-quantum well
MQW-FP multi-quantum well Fabry-Perot optical transmitter
MS mobile station
MSB most significant bit
MSBVW magneto-static backward volume waves
MSC mobile switching center
MSFVW magneto-static forward volume waves
MSG maximum stable gain
MSI medium scale integration
MSK minimum shift keying
MSMT micro surface-mount technology
MSOP mini(micro) small outline package
MSS mobile satellite system (service)
MSSW magneto-static surface waves
MSW magnetostatic wave
MTA microwave transition analyzer
MTBF mean time between failures
MTD moving target detection
MTI moving target indicator
MTTF mean time to failure
MTTR mean time to repair
MU minimum stability factor
MUNDI multiplexed network for distributed and interactive
services (UK)
MUX multiplexer
MVDS multi-point video distribution system
MWBIST millimeterwave built-in self test
NADC North American Dual-Mode (or Digital) Cellular
NA numerical aperture
N-AMPS Narrowband Advanced Mobile Phone System
NAVSTAR Navigational Satellite Timing and Ranging system
NEC numerical electromagnetic code
NEMA National Electrical Manufacturers Association
NEMS nanoelectromechanical systems
NFA noiseless feedback amplifier
NGA noise gain analyzer
NGSO nongeostationary orbit
NIC network interface card (WLAN)
NIST National Institute of Standards and Technology
NMC network management center
NMOS n-channel metal-oxide semiconductor
NMR nuclear magnetic resonance
NMSE normalized mean square error
NMT Nordic Mobile Telephone system
NODS near obstacle detection system
NPR noise power ratio
NPRM notice of proposed rule making
NQR nuclear quadruple resonance
NRZ nonreturn to zero
NSA normalized site attenuation
NSOM near-field scanning optical microscopy
NSSN National Standards System Network
NTSC National Television Systems Committee
OAD optical admittance diagram
OATS open area test site
OBU on board unit
OCDMA orthogonal code-division multiple access
OCPAR optically controlled phased-array radar
OCXO oven-controlled crystal oscillator
ODU outdoor unit (wireless)
OEIC optoelectronic integrated circuit
OEM original equipment manufacturer
OFDM orthogonal frequency-division multiplex
OFHC oxygen free high conductivity (copper)
OFS operational fixed service
OHI one horn interferometer
OMC operations and maintenance center
OMI optical modulation index
OMT orthogonal mode transducer
OOK on-off keying
OPBO output power backoff
OPIP output power intercept point
OPLL optical phase locked loop
OQPSK offset quadrature phase-shift keying
ORFS output RF spectrum
OSI open systems interconnection
OTDR optical time domain reflectometer
OTH over the horizon
OVSF orthogonal variable spreading factor
PA power amplifier
PAA phased-array antenna
PABX private automatic branch exchange
PAC perceptual audio coder
PACS personal access communications system (US version of PHS)
pACT personal air communications technology
PAE power-added efficiency
PAL programmable array logic
PAL phase-alternation line (video)
PAM pulse amplitude modulation
PAMR Public Access Mobile Radio
PAN public access network
PAPR peak-to-average power ratio
PAR peak-to-average ratio
PBG photonic band-gap
PBX private branch exchange
PCI peripheral component interconnect (bus)
PCIA Personal Communication Industry Association
PCM pulse code modulation
PCM process control monitor
PCMCIA Personal Computer Memory Card International Association
PCN personal communications network
PCS personal communication service
PCU power conditioning unit
PD predistortion
PD pulsed Doppler
PDA personal digital assistant (portable computing)
PDC personal digital cellular
PDF probability distribution function
PDH plesiochronous-digital hierarchy
PDIP plastic dual-in-line package
PDO packet data optimized
PDR polarization discrimination ratio
PDS power density spectrum
PEBB power electronic building blocks
PEC perfect electrical conducting
PECL positive/pseudo emitter-coupled logic
PECVD plasma-enhanced chemical vapor deposition
PEEC partial element equivalent circuit
PEI phase equal insertable
PEM plastic encapsulated microcircuits
PEP primary entry point
PEP peak envelope power
PFD phase/frequency discriminator
PHEMT pseudomorphic high electron mobility transistor
PHP personal handyphone, JPHP (Japan,1895.15-1905.15 MHz)
PHS personal handyphone system (Japan)
PHY physical layer (WLAN)
PIC photonic integrated circuit
PIC programmable integrated circuit
PIFA planar inverted-F antenna
PIM passive intermodulation
PIN positive-intrinsic-negative (diode junction)
PLCC plastic leaded chip carrier (molded plastic)
PLD programmable logic device
PLD pulsed laser deposition
PLF polarization loss factor
PLL phase-locked loop
PLMN private land mobile network
PM phase modulation
PM polarization-maintaining (optical fiber)
PMC perfect magnetic conducting
PMD polarization mode dispersion
PML perfectly matched layer
PMOS positive metal oxide semiconductor
PMR Private Mobile Radio
PN pseudorandom noise
PNF planar near-field (range)
PON passive optical network
POCSAG Post Office Code Standardization Advisory Group (paging)
POF plastic optical fiber
POFS private operational fixed service
POS Post Office Protocol
POTS plain old telephone service
PPM periodic permanent magnet (focused)
PPM pulse position modulation
PPS precise positioning service (GPS)
PPV perturbation projection vector
PQFP plastic quad flat pack
PR pseudorange
PRBS pseudorandom binary or bit sequence
PRF pulse repetition frequency
PRN pseudorandom noise
PROM programmable read-only memory
PRT planar resistor technology
PSA polysilicon self-aligned (bipolar transistor)
PSD power spectral density
PSK phase shift keying
PSMM pilot strength measurement message
PSTN public switched telephone network
PTFE polytetrafluoroethylene
PTH plated-through hole
PTMA planar printed triangular monopole antenna
PTO public telecommunications operator
PTT post, telephone and telegraph (Europe)
PWM pulse width modulation
P1dB power 1 dB compression point
QAM quadrature (quaternary) amplitude modulation
QFN quad flat no-lead (package)
QIFM quadrature intermediate frequency mixer
QoS quality of service
QPSK quadrature phase shift keying
QRNS quadratic residue number system
QSOP quality small outline package
QWIP quantum well infrared photodetector
QWR quarter wave rule
RACH random access channel
RADAR radio detection and ranging
RAIM receiver autonomous integrity monitoring (GPS)
RAM radar-absorbing material
RAM random access memory
RAP radar-absorbing paint
RAS radio astronomy synthesis
RBC radiation boundary conditions
RBER residual bit error ratio
RBS radio base station
RBW resolution bandwidth
RCS radar cross section
RDS radio data system
RELP residually excited linear predictive coder
RF radio frequency
RFID radio frequency identification
RFMU radio frequency monitoring unit
RFS radio frequency simulator
RHCP right-hand circular polarization
RIE reactive ion etch
RIN relative intensity noise
RISC reduced instruction set computing
RL rotating linear (antenna pattern)
RLL radio local loop
RMS root mean square
RNSS radio navigation satellite service
ROTHR relocatable over-the-horizon radar
RP range processor
RRC raised-root cosine
RRE radar range equation
RSL received signal level
RSR responder
RSSI received signal strength indicator
RSU roadside unit (auto toll collecting)
RTD resistance-temperature detector (probe)
RTD round trip delay
RwoH reliability without hermeticity
RWR radar warning receiver
RX receiver/receive
RZ return to zero
SA selective availability (GPS error introduction/correction)
SAR synthetic-aperture radar
SAR search and rescue
SAR specific absorption rate
SAT supervisory audio tone
SATCOM satellite communications
(Satellite Communications Agency, Department of Defense)
SAW surface acoustic wave
SBAS satellite-based augmentation system
SBN single sideband phase noise
SCCM single channel carrier modulation
SCFL source-coupled field-effect transistor logic
SCO synchronous connection orientated
SCPI Standard Commands for Programmable Instruments
SCR semiconductor-controlled rectifier
SCSI small computer standard/system interface
SDARS Satellite Digital Audio Radio Services
SDD symbolically defined device
SDH synchronous digital hierarchy (European telecommunication)
SDLA successive detection log amplifier
SDMA spatial-division multiple access
SDR software-defined radio
SDRAM synchronous dynamic random access memory
SEAD suppression of enemy air defenses
SEM scanning electron microscope
SEM singularity expansion method (radar)
SES severely errored seconds
SFD start of frame delimiter
SFDR spur-free dynamic range
SGLS space ground link system
SHF super high frequency
SI semi-insulating
SIC selectively implanted collector
SIG Special Interest Group
SIGINT signal intelligence
SIM subscriber identity module
SINAD signal-to-noise and distortion (ratio)
SINR signal to interference plus noise ratio
SIP single inline package
SIR signal to interference ratio
SIR stepped impedance resonator
SIS signal in space
SLE satellite link emulator
SLM spatial light modulator
SMI sample matrix inversion
SMP subminiature push-on (connector)
SMP surface-mount package
SMR specialized mobile radio
SMS short message service
SMT surface mount technology
SNA scalar network analyzer
SNIR signal-to-signal plus interference ratio
SNR signal-to-noise ratio
SOA safe operating area
SOC silicon on ceramic
SoC &