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| spe - 12 - 8 - 036 /b /wy page 1 of 16 specification model no. : ala.01 part no. : ala.01 .07.0095 a product name : 1575mhz ceramic active loop module features : 16db one stage pcb dims: 45*10 *2.3mm mm rohs compliant photo :
spe - 12 - 8 - 036 /b /wy page 2 of 16 1. introduction the activ e loop antenna ala.01 is best suited for applications where omni - directionality is important . th e average gain is similar to an 18mm active patch antenna but in a much narrower profile, only 2.3 mm at its highest point, allowing this antenna to be used perp endicular to the device main - board, or placed adjacent to the top or bottom of device main board. a one stage lna combined with a saw filter boosts the s/n (c/n) of the gps system and helps to overcome some noise effects from todays crowded device boards that passive antennas cannot resolve. the antenna can be placed in a plastic slot in the device housing. alternatively adhesive foam, hot - melt, or non - conductive screws could be used to mount the antenna. the core antenna design principle of loop current flow tends to lock - out a lot of surface noise from close circuitry from entering the antenna. 2. specification antenna parameter specification frequency 1575.42 1.023mhz bandwidth (10db return loss) 70mhz typical peak gain typ. 3.1dbi avg. gain - 2.2dbi polarization linear vswr 2 max (depends on the special environment) dimension 5*3*0.5mm spe - 12 - 8 - 036 /b /wy page 3 of 16 lna parameter specification frequency 1575.42 1.023mhz gain typ. 16db @ 3v typ. 17.8db @ 5v noise figure typ. 1.3db @ 3v filter (out of band attenu ation) saw filter (fo=1575.42mhz) 40db typ. fo 50mhz 45db min. fo 100mhz output vswr < 2.0 in put voltage dc = 2.6 ~ 5 .0 v current dc = 13ma at 3.0v cable *& connector parameter specification rf cable 95 ? 5 mm 1.13 coaxial cable connector ipex mhf(u.fl) total specification parameter specification frequency 1575.42 1.023mhz gain 16 4db @ 90 o output impedance 50 polarization linear output vswr max 2.0 operation temperature - 40 c to + 85 c storage temperature - 40 c to + 90 c humidity 10 to 95% input voltage min. 2. 6 v, typ. 3.0v, max. 5.0 v dimensions 45*10*2.3mm weight 1.35 0. 5g (typical) spe - 12 - 8 - 036 /b /wy page 4 of 16 3. performance measurement 3.1 block diagram 4. measurement method 4.1 chip a) reflection co - efficient measurement a. equipment: network analyzer (aglient e5071a)(fig.1) b. item s 11 log chart(return loss) s 11 smith chart (impedance) figure 1. network analyzer spe - 12 - 8 - 036 /b /wy page 5 of 16 b) pattern measurement a. equipment: anechoic chamber (fig. 2), network analyzer (aglient e8753es) b. item: gain pattern, axial ratio figure 2. quiet room figure 3. schematic of measurement set - up spe - 12 - 8 - 036 /b /wy page 6 of 16 4.2 lna a) parameter measurement a. equipment: network analy zer (aglient e5071b)(fig.4) b. s 11 , s 12 , s 21 , s 2 2 figure 4. network analyzer a) noise figure measurement a. equipment: noise meter (aglient e 4407b)(fig.5 ) b. environment: shielding room (fig. 6) c. item: n.f (noise figure) spe - 12 - 8 - 036 /b /wy page 7 of 16 5. measured values 5.1 chip 5.1.1 s 11 smith char t (impedance) spe - 12 - 8 - 036 /b /wy page 8 of 16 5.1.2 s 11 log chart (return loss): bandwidth s 11 < - 10db spe - 12 - 8 - 036 /b /wy page 9 of 16 5.1.3 s 11 vsr 5.1.4 radiation patterns (excluding lna) spe - 12 - 8 - 036 /b /wy page 10 of 16 plane xz yz xy average gain - 1.62 - 1.57 - 3.44 peak gain 4.92 1.89 2.75 spe - 12 - 8 - 036 /b /wy page 11 of 16 5.2 low noise amplifier (lna) 5.2.1 s 11 (network analyzer input power - 40db) spe - 12 - 8 - 036 /b /wy page 12 of 16 5.2.2 s 12 (network analyzer input power - 40db) spe - 12 - 8 - 036 /b /wy page 13 of 16 5.2.3 s 21 (gain) (network analyzer input power - 40db) spe - 12 - 8 - 036 /b /wy page 14 of 16 5.2.4 s 22 (gain) (network analyzer input power - 40db) spe - 12 - 8 - 036 /b /wy page 15 of 16 5.3 noise figure spe - 12 - 8 - 036 /b /wy page 16 of 16 6. drawing 1 chip antenna: 5*3*0.5mm 2 cable ?1.13 l=95 5mm 3 ipex mhfi(u.fl) 4 shielding case 5 pcb |
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