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spe - 12 - 8 - 080/ b /rc page 1 of 11 specification part number : ila.02 product name : low p rofile and high efficient 868 mhz ism band loop a ntenna features : small size antenna, low profile and high efficiency 868 mhz i sm band 1 dbi peak gain 10x3.2x0.5 mm size smt compatible rohs compliant
spe - 12 - 8 - 080/ b /rc page 2 of 11 1. introduct ion the ila.0 2 has excellent stability and sensitivity to consistently provide high signal reception efficiency , 60% at centre frequency and 60 % at the edges. based on the loop effect this antenna works the best when placed on the centre of the edge of the board, working better than traditional linear polarized chip ant enna. the antenna at 10x3.2x0.5 mm is low profile and would be suitable for devices wi th space constr aints. the ila.02 is delivered on tape and reel and now allows m2m customers to use an omni - directional smt antenna in devices where orientation of the product is unknown. the ila.02 loop antenna can be used in automated meter reading, (amr), radio frequen cy identification (rfid), remote monitoring, healthcare, sensing and others. 2. specification electrical antenna ila.02 standard 868 mhz ism operation frequency (mhz) 868 - 870 mhz polarization linear impedance 50 ohms max vswr 1.5 :1 max return loss ( db) - 1 7 peak gain 1 dbi efficiency (%) 50 average gain (db) - 3 radiation properties omni - directional max input power 5 w * the ila01 antenna performance was measured with 80x40 mm ground plane. mechanical dimensions (mm) 10x3.2x0. 5 require d space (mm) 11x10.4 material ceramic evb connector sma - female
spe - 12 - 8 - 080/ b /rc page 3 of 11 environmental operation temperature - 40c to 85c storage temperature - 40c to 105c relative humidity 4 0% to 95 % rohs compliant yes 3. test set up figure 1. impedance m easurements (left hand) and peak gain, average gain, efficiency and radiation pa ttern measurements (right hand) y x z
spe - 12 - 8 - 080/ b /rc page 4 of 11 4. antenna parameters 4 .1. return loss figure 2. return loss of 868 mhz ism band antenna ila.02 4 .2. vswr figure 3. vswr of 868 mhz ism band antenna ila.02
spe - 12 - 8 - 080/ b /rc page 5 of 11 4 .3. efficiency figure 4. efficiency of 868 mhz ism band antenna ila.02 4 .4. peak gain figure 5. peak gain of 868 mhz ism band antenna ila.02
spe - 12 - 8 - 080/ b /rc page 6 of 11 4.5. average gain figure 6. average gain of 868 mhz ism band a ntenna ila.02 4.6 . radiation pattern figure 7. radiation pattern at 868 mhz of the ila.02 antenna
spe - 12 - 8 - 080/ b /rc page 7 of 11 5. mechanical drawing figure 8. mechanical drawing of the ila.02 antenna
spe - 12 - 8 - 080/ b /rc page 8 of 11 6. integration guide 6 .1. reference ground plane figure 9. test evaluati on board with antenna. top layer (left hand) and bottom layer (right hand) 6 .2. solder land pattern land pattern for soldering is shown in gray, the keep out area of ground plane is shown in green. figure 10. solder area and keep out area.
spe - 12 - 8 - 080/ b /rc page 9 of 11 6 .3. matching circuit the initial matching circuit is lc1= 8.0 pf, lc2= 0? and lc3=open circuit. unless the matching circuit might change depending on ground plane size - shape, pcb, enclosure - material proximity and others. we recommend contacting taoglas for tuning services. figure 11. recommended matching circuit. 6 .4. recommendations ? route the co - planar waveguide (cpw) with curvy turns. ? allocate the antenna on the longest side of the board. ? center the antenna at the edge of the board. ? the antenna must be at the limit o f the ground plane on the selected edge. ? keep the l distance maximum 3 times the width of the cpw signal track, from the edge of the cpw ground to the keep out area of the antenna. ? keep the matching circuit close to the antenna. ? keep the w distance as the width of that gnd pad. ? keep the antenna 1 mm away from the enclosure. ? the cpw dimensions will change depending on pcb. ? keep low profile components such as lumped, ic, etc, min 2 mm away from the edge of the keep out area or antenna, at top and bottom l ayers. ? keep high profile components such as batteries, connectors, etc, 5 mm away from the edge of the keep out area or antenna, at top and bottom layers.
spe - 12 - 8 - 080/ b /rc page 10 of 11 7. recommended reflow temperature profile the ila01 loop antenna can be assembled following either sn - pb or pb - free assembly processes. the recommended soldering temperatures are as follows:
spe - 12 - 8 - 080/ b /rc page 11 of 11 8 . pack ag ing the ila.02 antennas are delivered in tape and reel with eia 481 - b polystyrene with 6000 p ieces per reel. figure 12. tape description for the ila.02 . figure 13. tape dimensions for the ila.02 .

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