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[HDTV] Antenna T.h-eory

 
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MessagePosté le: Jeu 12 Mai - 08:36 (2016)    Sujet du message: [HDTV] Antenna T.h-eory Répondre en citant
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This....symbol....comes....from....the....Greek....alphabet....and....is....used....in....antenna....terminology....quite....oftenFriis..Transmission..Formula..is..the..most..fundamental..equation..of..antenna..theory55-59.I....do....not....think....this....approach....effectively....teaches....antenna....theoryAs....you....can....see....these....are....two....different....antenna....requirementsThe...introduction...to...antennas...continues...with...a...discussion...of...Field...RegionsPhase...can...be...constructive...or...destructive,...by...allowing...the...antenna...to...work...well...in...performance...or...be...destructive...where...it...severely...affects...the...antennas...performanceWhitepaper..Available..Complete..this..form..to..receive..the..Smart..Grid..Coverage..whitepaperDirectivity....is....fundamental....to....antennasItasca,...IL...60143...Created...and...Maintained...by...WSI...The....second....way-Example....(2)....shows....a....Directional....wave....where....the....wave....is....traveling....from....the....rock....to....the....shore....in....a....defined....directionTo..convert..the..way..the..antenna..radiates..this..energy..or..receives..it..to..a..form..which..we..can..understand..and..graph,..an..Anechoic..Chamber..is..typically..used..for..the..measurement..and..test..equipment..used..for..interpolationTypically...a...panel,...parabolic,...yagi,...or...log...periodic...style...antenna...that...has...the...ability...to...focus...the...radiated...energyIt..would..look..something..like..this..Fig..(8.)Now..apply..this..to..an..X,..Y..graph..as..viewed..in..Fig..(5.)..Very..simple!..Another..example..would..be..a..world..map..compared..to..a..globeOr,..the..network..design..may..require..that..an..antenna..be..placed..upon..a..water..tower..to..provide..coverage..of..a..small..patch..of..manufacturing..shops..with..the..additional..requirement..that..the..radiated..signal..not..go..outside..this..areaThe....Far....Field,....Near....Field....and....Fresnel....Regions....for....an....antenna....is....presentedContinuing..on..we..need..to..understand..what..an..Elevation..Pattern..isBeamwidths....and....Sidelobes....Friis...Transmission...Equation...Refer..to..Fig..(7.)..and..locate..the..elevation..label21-25Did..you..know..that..deliberately..mismatching..an..antenna..to..it's..feed..line..can..increase..its..SWR..bandwidth?..Here's..how..it..works59-63You...don't...have...to...know...how...an...antenna...works...to...use...one,...but...getting...a...handle...on...this...subject...can...deepen...your...understanding...of...radioThorndale..AveThis....will....be....part....one....of....a....two....part....series....white....paperAvoiding...unnecessary...complexity...is...a...lifelong...goal...of...mineFor...example,...the...network...design...may...require...that...an...antenna...be...placed...upon...a...water...tower...to...provide...coverage...close...in...or...at...a...moderate...distance...for...all...of...the...homes...around...the...towerHere....we....will....place....four....points....equally....along....this....lineThis...is...very...helpful...for...antenna...placement...as...mentioned...above...(constructive...or...destructive...phase)Seen...in...(Fig...4.)...and...the...antenna...uses...the...reflection...created...by...the...ground...plane...to...establish...good...performanceA..discussion..on..how..all..waveforms..in..the..universe..are..made..up..of..the..sum..of..sinusoids..(simple..waves)..This..helps..explains..why..in..antenna..theory..we..always..discuss..wavelength..and..frequency..no..matter..what..signal..(information)..we..want..to..transmit........Fig....(10.)....Here....the....elevation....pattern....is....plotted....and....gives....us....a....good....representation....of....the....vertical....radiation....from....the....antennaUK..Office..Tel:..(+44)..1543..459555..Fax:..(+44)..1543..459545..US..Office..&..Headquarters..Tel:..(+1)..847..671..6690..Tel:..(+1)..800..648..2800..More...Advanced...Frequency...Information...In....my....life,....I....have....found....that....once....I....thoroughly....understand....a....subject,....I....am....amazed....at....how....simple....it....seems,....despite....the....initial....complexity d6d2cc075d
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