Reconfigurable antenna
[2] In order to provide a dynamic response, reconfigurable antennas integrate an inner mechanism (such as RF switches, varactors, mechanical actuators or tunable materials) that enable the intentional redistribution of the RF currents over the antenna surface and produce reversible modifications of its properties.Frequency reconfiguration is generally achieved by physical or electrical modifications to the antenna dimensions using RF-switches,[4] impedance loading[5] or tunable materials.[9][10][11] In the last 10 years, metamaterial-based reconfigurable antennas have gained attention due their small form factor, wide beam steering range and wireless applications.[17] Compound reconfiguration is the capability of simultaneously tuning several antenna parameters, for instance frequency and radiation pattern.The most common application of compound reconfiguration is the combination of frequency agility and beam-scanning to provide improved spectral efficiencies.
AntennasCommon typesDipoleFractalMonopoleSatellite dishTelevisionBlock upconverterCoaxial cableCounterpoise (ground system)Feed lineLow-noise block downconverterPassive radiatorReceiverRotatorTransmitterTwin-leadAntenna farmAmateur radioCellular networkHotspotMunicipal wireless networkRadio masts and towersWirelessWireless device radiation and healthWireless electronic devices and healthInternational Telecommunication UnionRadio RegulationsWorld Radiocommunication ConferenceBoresightFocal cloudGround planeMain lobeNear and far fieldSide lobeVertical planeArray gainDirectivityEfficiencyElectrical lengthEquivalent radiusFactorFriis transmission equationHeightRadiation patternRadiation resistanceRadio propagationRadio spectrumSignal-to-noise ratioSpurious emissionBeam steeringBeam tiltBeamformingSmall cellBell Laboratories LayeredSpace-Time (BLAST)Multiple-input multiple-output (MIMO)Spread spectrumWideband Space DivisionMultiple Access (WSDMA)antennaRF switchesvaractorsmechanical actuatorstunable materialssmart antennasfrequency of operationpolarizationparasiticmetamaterial-basedPlasma antennasRF-MEMSPIN diodesAntenna (radio)RF MEMSSmart antennaBibcodeHarrington, R.F.Applied Physics LettersJournal of Applied PhysicsIsotropicIsotropic radiatorOmnidirectionalBatwing antennaBiconical antennaCage aerialCoaxial antennaCrossed field antennaDielectric resonator antennaDipole antennaDiscone antennaFolded unipole antennaG5RV antennaHalo antennaHelical antennaInverted-F antennaInverted vee antennaJ-pole antennaMast radiatorMonopole antennaRandom wire antennaRubber ducky antennaSloper antennaTurnstile antennaT2FD antennaT-antennaUmbrella antennaWhip antennaDirectionalAdcock antennaAWX antennaBeverage antennaCantennaCassegrain antennaChoke ring antennaCollinear antenna arrayConformal antennaCorner reflector antennaCurtain arrayFolded inverted conformal antennaFractal antennaGizmotchyHorn antennaLog-periodic antennaLoop antennaMicrostrip antennaMoxon antennaOffset dish antenna