User's Manual
RLX2 Industrial Hotspot Series
Page182of208 ProSoftTechnology,Inc.
February5,2015
equalnarrowerbeamwidth.Theantennagainalsodependsonthenumberof
elements/length,wheremoreelementsproducehighergain.Typicalgainis5to10dBi.
Theantennapolarityislinear,orparalleltothelengthoftheantenna.
YagiArrayAntenna
Ayagiantennaiscomposedofanarrayoflinearelements,eachparalleltooneanother
andattachedperpendiculartoandalongthelengthofametalboom.Thefeedis
attachedtoonlyoneoftheelements.Elementsononesideofthefedelementare
longerandactasreflectors;elementsontheothersideareshorterandactasdir
ectors.
Thiscausestheantennatoradiateinabeamoutoftheendwiththeshorterelements.
Thepatterndependsontheoverallgeometry,includingthenumberofelements,
elementspacing,elementlength,andsoon.Sometimestheantennaisenclose
dina
protectivetubehidingtheactualantennageometry.
Theantennapattern(page178)isabeampointedalongtheboo mtowardtheendwith
theshorterelements.Thebeamwidthvarieswithantennageometrybutgenerallyis
proportionaltothelength(wherelongerlengthproducesanarrowerbeam).
Theantennagain(page180)varieswithante
nnageometrybutgenerallyisproportional
tothelength(wherelongerlengthproduceshighergain).Typicalvaluesare6to15dBi.
TheantennapolarityisLinear(paralleltotheelements,perpendicular totheboom).
RefertotheAntennaTypesoverviewsectionforothertypesofapprovedantennas
(page183).
ParabolicReflectorAntennas
Aparabolicreflectorantennaconsistsofaparabolicshapeddishandafeedantenna
locatedinfrontofthedish.Powerisradiatedfromthefeedantennatowardthe
reflector.Duetotheparabolicshape,thereflectorconcentratestheradiationintoa
narrowpattern,resultinginahigh‐gainbeam.