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s pe - 11 - 8 - 040/ e /ss page 1 of 20 specification part no. : gla.01 product name : 2.5dbi 1575 .42m hz gps loop antenna feature : low profile smt antenna high performance magnetic field antenna rohs compliant antenna antenna on evb
s pe - 11 - 8 - 040/ e /ss page 2 of 20 1. introduction taoglas have developed a unique ceramic miniature loop antenna series for gps applications. at 5 .0* 3 .0*0.5 mm , the gla.01 gps loop antenna is a miniature edge mounted antenna, designed for small space requirements. the radiation pattern is more omni - directional than traditional pat ch antennas. the gla loop antenna series show at least three times the efficiency of traditional linear polarized 1575 .42mhz mhz antennas. efficiencies of 40% to 90% are achievable. peak gain of 2.5dbi places this antenna gain performance within the range of a much larger 15mm to 18mm patch antenna. mech anically, the gla.01 at only 0.5 mm in height has a very low profile, and with a footprint of 6 .0 x 5.5mm needs less space on the board, it does require clearance of 6 .0 x 5.5mm. based on the loop effect th is antenna works best when placed on the centre of the edge of the board, but can still work better than traditional linear polarized chip antennas even when placed at corners as substitute. the gla.01 is delivered on tape and reel and now allows m2m cust omers to use an omni - directional antenna in devices where orientation of the product is unknown. applications * n avigation or position tracking systems *hand - held devices when gps function is needed, e.g., s mart phone. pda,
s pe - 11 - 8 - 040/ e /ss page 3 of 20 2. 2. specification electrical c entre frequency 1575.42mhz 2mhz vswr 2 : 1 max polarization linear bandwidth 50mhz ( - 10db return l oss) peak gain 2.5dbi typ. efficiency 83% typ. impedance 50 w mechanical dimensions 5.0 x 3.0 x 0.5 mm material ceramic environmental operation t emperature - 40c to 85c storage temperature - 40c to 105c temperature coefficient ? ?? 20 ppm @ - 20oc to +80oc recommended reel storage condition 5c to 40c relative humidity 20% to 70% * electrical properties are measured with the antenna properly mounted on evb of 80 x 40mm.
s pe - 11 - 8 - 040/ e /ss page 4 of 20 3. s11 property 3.1. return loss
s pe - 11 - 8 - 040/ e /ss page 5 of 20 3.2. impedance 4. 2d radiation property @ 1575.42mhz gain table plane xz yz xy peak gain 2.9 2.4 0.3 average gain - 2.9 - 0.1 - 6.2
s pe - 11 - 8 - 040/ e /ss page 6 of 20 4.1. xy plane radiation
s pe - 11 - 8 - 040/ e /ss page 7 of 20 4.2. xz plane radiation
s pe - 11 - 8 - 040/ e /ss page 8 of 20 4.3. yz plane radiation
s pe - 11 - 8 - 040/ e /ss page 9 of 20 5. 3d gain pattern of gla.01 on different ground 5.1. 80 * 40mm evb frequency(mhz) 1560 1565 1570 1575 1580 1585 1590 efficiency (%) 82.8 83.8 83.0 83.1 83.6 83.0 82.0 gain (dbi) 2.7 2.8 2.8 2.8 2.8 2.7 2.7 average gain (db) - 0.8 - 0.8 - 0.8 - 0.8 - 0.8 - 0.8 - 0.9
s pe - 11 - 8 - 040/ e /ss page 10 of 20 5.2. centre top of 50 x 100mm pcb \ frequency(mhz) 1560 1565 1570 1575 15 80 1585 1590 efficiency (%) 40.2 47.8 53.9 58.0 58.1 53.8 47.0 peak gain (dbi) - 2.5 - 1.8 - 1.2 - 0.9 - 0.9 - 1.2 - 1.8 average gain (db) - 4.0 - 3.2 - 2.7 - 2.4 - 2.4 - 2.7 - 3.3
s pe - 11 - 8 - 040/ e /ss page 11 of 20 5.3. top left of 50 x 100mm pcb frequency(mhz) 1560 1565 1570 1575 1580 1585 1590 e fficiency (%) 50.8 58.5 63.9 67.0 66.8 62.6 56.0 gain (dbi) - 1.6 - 1.0 - 0.6 - 0.3 - 0.3 - 0.6 - 1.1 average gain (db) - 2.9 - 2.3 - 1.9 - 1.7 - 1.8 - 2.0 - 2.5
s pe - 11 - 8 - 040/ e /ss page 12 of 20 6. mechanical drawing
s pe - 11 - 8 - 040/ e /ss page 13 of 20 gla.01 on evb
s pe - 11 - 8 - 040/ e /ss page 14 of 20 close up on evb pictured with antenna faci ng up on component side of eval uation board
s pe - 11 - 8 - 040/ e /ss page 15 of 20 7. antenna layout guide 7.1. antenna position gla.01 should be mounted at the edge (preferably longer than 50mm) of the pcb. mounting antenna at the centre of the pcb edge and keep the ground area around the antenna as symmetric as possible tend to achieve higher antenna radiation efficiency. at least 5mm away from surrounding parts is required for the antenna to work. n ote that gla.01 has no orientation. i t has the same performance when mounting it left side right or bottom side up. no metal, including coppers on pcb and components , is allowed i n the top side, bottom side and board side of the antenna, as indicated by red arrows. if gla.01 cannot be mounted right at the edge, please make sure that there is board size clearance, i.e. no metal between gla.01 and pcb edge.
s pe - 11 - 8 - 040/ e /ss page 16 of 20 7.2. pcb layout footprint of gla.01 ( grey marking areas) is as shown below. both pad s indicated with g should be connected to the ground directly. all layers need to have the clearance for gla.01 to function correctly. the pink dots in the diagram are vias. via around the ground e dges and all across the ground are recommended as they can keep all ground layers well connected together and have the same reference voltage everywhere in the system. top pcb layer
s pe - 11 - 8 - 040/ e /ss page 17 of 20 bottom pcb layer t h e feed and the adjacent ground connection wit h gla.01 may look like creating a short circuit. but in terms of rf signal, gla.01 is guiding the electric current to flow in a loop and back to the starting point to create radiation.
s pe - 11 - 8 - 040/ e /ss page 18 of 20 7.3. matching circuit it is a good idea to reserve footprints for matching component in case they are needed later. the matching components should be 1~2mm away from gla.01. matching circuit position the most common matching arrangement is the pi matching as shown below. we have 2.2pf capacitor for component 3 and 0ohm resis ter for component 2 on evb.
s pe - 11 - 8 - 040/ e /ss page 19 of 20 7.4. re c ommended reflow profile
s pe - 11 - 8 - 040/ e /ss page 20 of 20 8. packing 6 000pcs/reel tape dimensions (unit: mm) feature specifications tolerances w 12 0.30 p 8 0.10 e 1.75 0.10 f 5.5 0.10 p2 2 0.10 d 1. 2 0.10 po 4 0.10 10po 40 0.20 pocket dimensions (unit: mm) feature specifications tolerances ao 3.25 0.10 bo 5.25 0.10 ko 0.90 0.10 t 0.30 0.05

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