Acronyms and Abbreviations Used by the RF/Microwave Industry

Frank Bashore
Microwave Journal Staff

This list represents most of the acronyms and abbreviations used in Microwave Journal technical articles and editorial features during the last five years. The ever-growing list has proven enormously useful to our staff and should prove equally helpful to our readers, who are continually bombarded with new and confusing abbreviations for the plethora of technical terms associated with the RF/microwave industry. Although it has always been our policy to define all but the most commonly used abbreviations within each article, a central reference list can be quite helpful to everyone. The original acronym and abbreviation list was first published in the February/March 1997 issues of Microwave Journal, and our staff has received many positive comments and continued requests for updates.

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

AFP automatic frequency planning

AGC automatic gain control

AICC autonomous intelligent cruise control

AM amplitude modulation

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

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

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

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 air traffic management

ATM asynchronous transfer mode

ATPC automatic transmit power control

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

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

BJT bipolar junction transistor

BLOS beyond line-of-sight

BOM bill of materials

BOR body of revolution

BPSK biphase-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/A clear and acquisition code (GPS)

C-AFM calibrated atomic force microscope

CAE computer-aided engineering

CALLUM combined analog locked-loop universal modulator

CATV community antenna television

CBCPS conductor-backed coplanar stripline

CCA circuit card assembly

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

CMOS complementary metal-oxide semiconductor

CMRF combined mode resonator filter

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 United States

COPS complex operations per second

COTS commercial off-the-shelf

CPCI compact protocol control information

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

CT cordless telephone

CT-2 cordless telephone-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

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

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 to 1900 MHz)

DECT Digital Enhanced Cordless Telephony (new name)

DESC Defense Electronic Supply Center

DF direction finding

DFB distributed feedback

DFD digital frequency discriminator

D-FET depletion-mode field-effect transistor

DFT discrete Fourier transform

DGPS Differential Global Positioning System

DHBT double-heterojunction bipolar transistor

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

DMSP Defense Meteorological Satellite Program

DMR dual-mode resonators

DMUX demultiplexer

DNL dynamic nonlinearity

DQPSK differential quadrature phase-shift keying

DPHEMT double heterojunction pseudomorphic high electron mobility transistor

DPLL digital phase-locked loop

DPSK differential phase-shift keying

DRFM digital radio frequency memory

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

DTF distance-to-fault

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

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

EEA EU and EFTA merge unit

EEC European Economic Community

EEPROM electrically erasable programmable read-only memory

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

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

ELINT electronic intelligence systems

EM electromagnetic

EMC electromagnetic compatibility

EMF electromotive force

EMI electromagnetic interference

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

FBW fractional bandwidth

FCA flip-chip assembly

FCC Federal Communications Commission

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

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

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)

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

GUI graphical user interface

HARM high speed anti-radiation missile

HBT heterojunction bipolar transistor

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

HSCSD high speed circuit switched data

HTS high temperature superconductor

IBIC interface bus interactive control

IBOC in-band on-channel

IBW instantaneous bandwidth

IC integrated circuit

IDECM integrated defense electronic countermeasures

IDFT inverse discrete Fourier transform

IDT interdigital transducer

IEC International Electrotechnical Commission

IEP ideal electric plane

IF intermediate frequency

IFB indirect feedback

IFF identification friend or foe

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

IP Internet Protocol

IPBO input power backoff

IPC Institute for Interconnecting and Packaging Electronic Circuits

IPS integrated power systems

IQ in-phase/quadrature

IR infrared

IRA impulse radiating antennas

IRM image reject mixer

IS-95 North American cellular standard

ISAR inverse synthetic-aperture radar

ISDN integrated services digital network

ISI intersymbol interference

ISM industrial, scientific and medical (frequency bands)

ISO International Standards Organization

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)

KGD known good die

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

LINC linear amplification with nonlinear components

LMCS local multipoint communications system

LMDS local multipoint distribution system

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 lowpass equivalent

LPF lowpass filter

LPI low probability of intercept

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

LTSA linear taper slot antenna

LTP long-term predictor

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

MBPA multi-beam phased array

MCE manufacturing cycle efficiency

MCF message communication function

MCL microstrip constrained lens

MCM multichip module

MCM-C multichip module with co-fired substrate

MCPA multicarrier power amplifier

MCPW microstrip coplanar waveguide

MCT metal-oxide semiconductor-controlled thyristor

MDS multipoint distribution system

MEADS medium extended air defense system

MEMS microelectromechanical system

MESFET metal-semiconductor field effect transistor

MEO medium earth orbit (satellite)

MIC microwave integrated circuit

MIC monolithic integrated circuit

MIDAS multiple integration and defense communications satellite network

MIM metal-insulator-metal (capacitor)

MIMIC Millimeter-wave and Microwave Integrated Circuit (R&D program)

MIPS million instructions per second

MIR microwave impulse radar

MLA microwave link analyzer

MLB multilayer board

MLC main lobe clutter

MLCM multilevel coded modulation

MLDD matched-line directional divider

MMC metal-matrix composite

MMCA microwave multichip assembly

MMDS multichannel multipoint 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

MoM method of moments

MOS metal-oxide semiconductor

MPEG Motion Picture Experts Group

MPIE mixed potential integral equation

MPM microwave power module

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

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 multipoint video distribution system

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

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 onboard unit

OCDMA orthogonal code division multiple access

OCPAR optically controlled phased-array radar

OCXO oven-controlled crystal oscillator

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

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

OSI open systems interconnection

OTDR optical time domain reflectometer

OTH over the horizon

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

PBG photonic bandgap

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

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

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 to 1905.15 MHz)

PHS personal handyphone system (Japan)

PHY physical layer (WLAN)

PIC photonic integrated circuit

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)

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

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

QIFM quadrature intermediate frequency mixer

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

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

RSSI received signal strength indicator

RSU roadside unit (auto toll collecting)

RTD resistance-temperature detector (probe)

RTD roundtrip 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

SCFL source-coupled field effect transistor logic

SCPI Standard Commands for Programmable Instruments

SCR semiconductor-controlled rectifier

SCSI small computer standard/system interface

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

SES severely errored seconds

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)

SIP single inline package

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

SOI silicon on insulator

SOIC small outline integrated circuit

SOLR short-open-line-reciprocal (calibration)

SOLT short-open-load-thru (calibration)

SONET synchronous optical network (US telecommunications)

SOT small outline transistor

SP3 third-order suppression

SPC statistical process control

SPI serial peripheral interface

SPRE satellite position reporting equipment

SPS standard positioning service (GPS)

SPUDT single-phased unidirectional transducer

SRAM static random access memory

SS spread spectrum

SSB single sideband

SSBW surface-skimming bulk wave

SSD simultaneous signal detection

SSG small-signal gain

SSI small-scale integration

SSOP shrink small outline package

SSOT shrink small outline transistor

SSPA solid-state power amplifier

SSPE single solid-phase epitaxy

SSR surface search radar

STALO stable local oscillator

STM synchronous transport module (1 STM = 155 Mbps)

STOVL short takeoff, vertical landing (aircraft)

STW surface transverse wave

SWAP shared wireless access protocol

SWR standing wave ratio

TAB tape-augmented bonding

TACAN tactical air navigation system

TACS Total Access Communications System

TAG technical advisory group

TARD towed active radar device

TBCCO thallium barium calcium copper oxide

TCAS Traffic Alert and Collision Avoidance System

TCC temperature coefficient of capacitance

TCE thermal coefficient of expansion

TCH traffic channel

TCM trellis-coded modulation

TCR temperature coefficient of resistance

TCXO temperature-compensated crystal oscillator

TDD time division duplex

TDD time domain duplex

TDMA time division multiple access

TDMQPSK time division multiplex quadrature phase-shift keying

TDWR terminal Doppler weather radar

TE transverse electric

TEC thermal electric cooler

TEM transverse electromagnetic

TETRA trans-European trunked radio (old name)

TETRA terrestrial trunked radio (new name)

TFT thin-film transistor/technology

TFTS terrestrial flight telephone system

TLM transmission line matrix

TM transverse magnetic

TMA thermomechanical analysis

TMN telecommunication management network

TOI third-order intercept (point)

T/R transmit/receive

TRAC Technical Regulations Application Committee (of ETSI)

TRAM transimpedance amplifier

TRP Technology Reinvestment Program (NIST)

TRL thru-reflect-line (calibration)

TRX transceiver

TS timeslot

TSA tapered-slot antenna

TSOP thin small outline package

TSS tangential signal sensitivity

TTD true time delay

TTL transistor-transistor logic

TVRO television receive only

TWTA traveling-wave-tube amplifier

TX transmit/transmitter

UAV unmanned aerial vehicles

UFMOP unintentional frequency modulation on pulse

UIM uniform impedance resonator

UM unintentional modulation

UMTS Universal Mobile Telecommunications System (Europe)

U-NII Unlicensed National Information Infrastructure

UPT universal personal telecommunications

URE user range error

USAT ultra-small aperture terminals

UTC Universal Time, Coordinated

UWB ultrawideband

VANA vector automatic network analyzer

VBW video bandwidth

VCO voltage-controlled oscillator

VDU video display unit

VHDL very high speed IC description language

VISA virtual instrument software architecture

VLR visitor location register

VLSI very large scale integration

VMEbus versa module Eurocard computer bus

VNA vector network analyzer

VPN virtual private networks

VSAT very small aperture terminal

VSB vestigial side band modulation

VSB VMEbus subsystem bus

VSWR voltage standing wave ratio

VVA voltage-variable attenuator

VXIbus VMEbus extension for instrumentation

WAAS wide area augmentation system (GPS ground based)

WADSP wideband acquisition/digital signal processing

WAN wide area network

WAP Wireless Application Protocol

WBMCS wireless broadband multimedia communications systems

W-CDMA wideband code division multiple access

WDM wavelength division multiplexing

WDDM wavelength division demultiplexing

WEP wired equivalent privacy

WLAN wireless local area network

WLL wireless local loop

XFCB extra-fast complementary bipolar

XPD cross-polarization discrimination

XPIC cross-polar interference canceller

XPOL cross-polarization level

YAG yttrium aluminum garnet

YBCO yttrium barium copper oxide

YIG yttrium iron garnet

YTO YIG-tuned oscillator

3G third generation

3GPP Third-generation Partnership Project