Matches in DBpedia 2015-10 for { <http://dbpedia.org/resource/Microwave> ?p ?o }
- Microwave abstract "Microwaves are a form of electromagnetic radiation with wavelengths ranging from as long as one meter to as short as one millimeter; with frequencies between 300 MHz (100 cm) and 300 GHz (0.1 cm). This broad definition includes both UHF and EHF (millimeter waves), and various sources use different boundaries. In all cases, microwave includes the entire SHF band (3 to 30 GHz, or 10 to 1 cm) at minimum, with RF engineering often restricting the range between 1 and 100 GHz (300 and 3 mm).The prefix micro- in microwave is not meant to suggest a wavelength in the micrometer range. It indicates that microwaves are "small", compared to waves used in typical radio broadcasting, in that they have shorter wavelengths. The boundaries between far infrared, terahertz radiation, microwaves, and ultra-high-frequency radio waves are fairly arbitrary and are used variously between different fields of study.Beginning at about 40 GHz, the atmosphere becomes less transparent to microwaves, at lower frequencies to absorption from water vapor and at higher frequencies from oxygen. A spectral band structure causes absorption peaks at specific frequencies (see graph at right). Above 100 GHz, the absorption of electromagnetic radiation by Earth's atmosphere is so great that it is in effect opaque, until the atmosphere becomes transparent again in the so-called infrared and optical window frequency ranges.The term microwave also has a more technical meaning in electromagnetics and circuit theory. Apparatus and techniques may be described qualitatively as "microwave" when the frequencies used are high enough that wavelengths of signals are roughly the same as the dimensions of the equipment, so that lumped-element circuit theory is inaccurate. As a consequence, practical microwave technique tends to move away from the discrete resistors, capacitors, and inductors used with lower-frequency radio waves. Instead, distributed circuit elements and transmission-line theory are more useful methods for design and analysis. Open-wire and coaxial transmission lines used at lower frequencies are replaced by waveguides and stripline, and lumped-element tuned circuits are replaced by cavity resonators or resonant lines. In turn, at even higher frequencies, where the wavelength of the electromagnetic waves becomes small in comparison to the size of the structures used to process them, microwave techniques become inadequate, and the methods of optics are used.".
- Microwave thumbnail Frazier_Peak,_tower_and_Honda_Element.jpg?width=300.
- Microwave wikiPageExternalLink waveguide-dimensions.
- Microwave wikiPageExternalLink www.emtalk.com.
- Microwave wikiPageExternalLink microwaves.
- Microwave wikiPageID "20097".
- Microwave wikiPageLength "33871".
- Microwave wikiPageOutDegree "274".
- Microwave wikiPageRevisionID "683781307".
- Microwave wikiPageWikiLink 802.11.
- Microwave wikiPageWikiLink 802.11a.
- Microwave wikiPageWikiLink AT&T_Communications.
- Microwave wikiPageWikiLink AT&T_Long_Lines.
- Microwave wikiPageWikiLink Absorption_(electromagnetic_radiation).
- Microwave wikiPageWikiLink Absorption_wavemeter.
- Microwave wikiPageWikiLink Active_Denial_System.
- Microwave wikiPageWikiLink Active_denial_system.
- Microwave wikiPageWikiLink Air_traffic_control.
- Microwave wikiPageWikiLink Americas.
- Microwave wikiPageWikiLink Atacama_Large_Millimeter_Array.
- Microwave wikiPageWikiLink Bandwidth_(signal_processing).
- Microwave wikiPageWikiLink BeiDou_Navigation_Satellite_System.
- Microwave wikiPageWikiLink Beidou_navigation_system.
- Microwave wikiPageWikiLink Bel_(unit).
- Microwave wikiPageWikiLink Big_Bang.
- Microwave wikiPageWikiLink Bit_rate.
- Microwave wikiPageWikiLink Black-body_radiation.
- Microwave wikiPageWikiLink Block_upconverter.
- Microwave wikiPageWikiLink Blood_vessel.
- Microwave wikiPageWikiLink Bluetooth.
- Microwave wikiPageWikiLink Broadcast_auxiliary_service.
- Microwave wikiPageWikiLink Broadcasting.
- Microwave wikiPageWikiLink Burn.
- Microwave wikiPageWikiLink C_band.
- Microwave wikiPageWikiLink Capacitor.
- Microwave wikiPageWikiLink Carcinogen.
- Microwave wikiPageWikiLink Cassiopeia_A.
- Microwave wikiPageWikiLink Cataract.
- Microwave wikiPageWikiLink Category:Electromagnetic_spectrum.
- Microwave wikiPageWikiLink Category:Microwave_technology.
- Microwave wikiPageWikiLink Category:Radio_technology.
- Microwave wikiPageWikiLink Category:Wireless.
- Microwave wikiPageWikiLink Cavity_magnetron.
- Microwave wikiPageWikiLink Cellular_network.
- Microwave wikiPageWikiLink Chemical_vapor_deposition.
- Microwave wikiPageWikiLink Circuit_theory.
- Microwave wikiPageWikiLink Communications_protocol.
- Microwave wikiPageWikiLink Communications_satellite.
- Microwave wikiPageWikiLink Cornea.
- Microwave wikiPageWikiLink Cosmic_microwave_background.
- Microwave wikiPageWikiLink Cosmic_microwave_background_radiation.
- Microwave wikiPageWikiLink Curing_(chemistry).
- Microwave wikiPageWikiLink DVB-SH.
- Microwave wikiPageWikiLink D_band.
- Microwave wikiPageWikiLink Data_transmission_rate.
- Microwave wikiPageWikiLink Decibel.
- Microwave wikiPageWikiLink Denaturation_(biochemistry).
- Microwave wikiPageWikiLink Density.
- Microwave wikiPageWikiLink Dielectric_heating.
- Microwave wikiPageWikiLink Digital_Audio_Radio_Service.
- Microwave wikiPageWikiLink Direct-broadcast_satellite.
- Microwave wikiPageWikiLink Directional_antenna.
- Microwave wikiPageWikiLink Distributed_element_model.
- Microwave wikiPageWikiLink Egg_white.
- Microwave wikiPageWikiLink Eleanor_R._Adair.
- Microwave wikiPageWikiLink Electric_current.
- Microwave wikiPageWikiLink Electrochemistry.
- Microwave wikiPageWikiLink Electromagnetic_induction.
- Microwave wikiPageWikiLink Electromagnetic_radiation.
- Microwave wikiPageWikiLink Electromagnetic_spectrum.
- Microwave wikiPageWikiLink Electromagnetic_wave.
- Microwave wikiPageWikiLink Electromagnetics.
- Microwave wikiPageWikiLink Electromagnetism.
- Microwave wikiPageWikiLink Electron.
- Microwave wikiPageWikiLink Electron_cyclotron_resonance.
- Microwave wikiPageWikiLink Electron_paramagnetic_resonance.
- Microwave wikiPageWikiLink Electronvolt.
- Microwave wikiPageWikiLink Energy.
- Microwave wikiPageWikiLink Exa-.
- Microwave wikiPageWikiLink Extremely_high_frequency.
- Microwave wikiPageWikiLink Extremely_low_frequency.
- Microwave wikiPageWikiLink F_band.
- Microwave wikiPageWikiLink Fabrication_(semiconductor).
- Microwave wikiPageWikiLink Far_infrared.
- Microwave wikiPageWikiLink Femto-.
- Microwave wikiPageWikiLink Fiber-optic.
- Microwave wikiPageWikiLink Field-effect_transistor.
- Microwave wikiPageWikiLink Fixed-satellite_service.
- Microwave wikiPageWikiLink Fixed_satellite_service.
- Microwave wikiPageWikiLink Free_radical.
- Microwave wikiPageWikiLink Frequency.
- Microwave wikiPageWikiLink Frequency-division_multiplexing.
- Microwave wikiPageWikiLink Frequency_counter.
- Microwave wikiPageWikiLink Frequency_division_multiplex.
- Microwave wikiPageWikiLink Frequency_reuse.
- Microwave wikiPageWikiLink GLONASS.
- Microwave wikiPageWikiLink GSM.
- Microwave wikiPageWikiLink Gamma_ray.
- Microwave wikiPageWikiLink Global_Navigation_Satellite_System.
- Microwave wikiPageWikiLink Global_Positioning_System.