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spe - 13 - 8 - 079 / a /as page 1 of 11 specification part number: ri .01.26.1500 q product name : 915mhz road m arker antenna features : high performance antenna solution inside a standard road marker rohs compliant top bottom side profile
spe - 13 - 8 - 079 / a /as page 2 of 11 1. i ntroduction t aoglas usa has designed a range of e fficient antenna s inside us standard raised non reflective roadmarker s . th ese are designed for, and installed inside, the low profile botts dot s that can to be mounted directly on the pavement and road in the usa. th ese antenna s exhibit remarkably high efficiencies in such s mall package s and live in a very low profile enclosure. they are designed to be mounted directly on the road, pavement or manhole cover , just like a standard roadmarker. the se antenna s have been potte d with the epoxy that is tradi ti onal ly used to secure the roadmarker itself to the ground. there are no air gaps whatsoever inside the new type approved roadmarker with antenna, in order to maintain the mechanical integrity. it is presumed that th e standard black epoxy will also be used to install the roadmar ker in its final resting place on the ground.
spe - 13 - 8 - 079 / a /as page 3 of 11 2. specification electrical band 915 mhz ism frequency (mhz) 902 - 928 polarization linear impedance (ohms) 50 ohms peak gain (dbi) 3 .2 efficiency (%) 26 return loss (db) - 18 radiati on properties omni - directional max input power (watts) 10 mechanical dimensions height = 19 mm and diameter = 9 9mm cable belden 7805r coaxial cable connector smb (m) jack straight 50 ohms casing uv resistant abs sealant potting environmen tal protection ip67 corrosion 5% naci for 96hrs temperature range - 4 0 c to +85 c thermal shock 100 cycles - 4 0 c to +85 c humidity non - condensing 65 c 95% rh shock (drop test) 1m drop on concrete 6 axes cable pull 8 kgf
spe - 13 - 8 - 079 / a /as page 4 of 11 3. test set up figure 1. impe dance (left hand) and peak gain , efficiency and radiation pattern measurements (right hand).
spe - 13 - 8 - 079 / a /as page 5 of 11 4. antenna parame ters 4 .1. return loss f igure 2 . return loss 915mhz road marker in free space and on piece of road. 4.2 . efficiency f igure 3 . efficiency of the 915mhz road marker in free space and on piece of road.
spe - 13 - 8 - 079 / a /as page 6 of 1 1 4 .3 . peak gain f igure 4 . peak gain 915mhz road marker in fre e space and on piece of road
spe - 13 - 8 - 079 / a /as page 7 of 11 4 .4 . radiation pattern figure 5. road marker ism antenna radiation pattern at 900 mhz on piece of road. . figure 6. r adiation pattern at 915 mhz on a piece of road.
spe - 13 - 8 - 079 / a /as page 8 of 11 figure 7. radiation pattern at 930 mhz on a piece of road . . figure 8. radiation pattern at 900 mhz in free space.
spe - 13 - 8 - 079 / a /as page 9 of 11 . figure 9. r adiation pattern at 915 mhz in free space. figure 10. radiation pattern at 930 mhz in free space.
spe - 13 - 8 - 079 / a /as page 10 of 11 5. m echanical drawing
spe - 13 - 8 - 079 / a /as page 11 of 11

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