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spe - 12 - 8 - 012/a/zl page 1 of 12 specification part no. : fxp 7 2 .07.0053 a product name : fxp72 freedom 2.4ghz series ground coupled antenna feature : 4dbi gain ipex mhfi connector (u.fl compatible) 53 mm cable 31 x 31 x 0.1 mm rohs compliant
spe - 12 - 8 - 012/a/zl page 2 of 12 i. overview the fxp72 freedom 2.4 ghz antenna works on wifi, zigbee, bluetooth and ism band at 2.4ghz. this antenna has been designed with a specific characteristic of having a ground coupling effect in between the antenna and the devices board, suitable for those devices where there is n o clearance in between the enclosure and the board, keeping the antenna performance. the antenna can be placed above or below of the devices board, but leaving the radiated elements of the antenna free of metal. this design can work on different thickness and plastic materials. we have selected a piece of abs plastic with 1.5 mm of thickness for testing. ii. anten na characteristics parameter multi - standard communication system bluetooth wifi zigbee 2.4ghz ism 2401 - 2480 2412 - 2462 2410 - 2480 2400 - 2483.5 e fficiency 7 0 % gain 5 dbi free space peak gain - 0.5dbi return loss - 14 db impedance 50 ohms vswr 2.0:1 polarization linear power handled 5 w operation temperature - 40 oc ~ +85 oc storage temperature - 40 oc ~ +85 oc dimensions 31 x 31 x 0.08 mm w eight 1.2 g connector mhfi (u.fl compatible) cable standard mini - coax 1.13 mm cable length and color 53 mm, black rohs compliant yes adhesive 3m 467
spe - 12 - 8 - 012/a/zl page 3 of 12 iii. test set up a satimo sg24 3d scan system with anechoic chamber. figure 1 . satimo system. agilent 8753es vector network a nalyzer . figure 2 . network analyzer. y x z
spe - 12 - 8 - 012/a/zl page 4 of 12 iv. antenna parameters the next antenna parameter graphs like return loss, smith chart and vswr were measured in the agilent 8753es vector network analyzer. the gain, efficiency and rad iation patterns were measured in the reliable satimo 3d scan system. a. return loss data figure 3 . return loss for the fxp 72 antenna. b. vswr data figure 4 . vswr for the fxp72 antenna .
spe - 12 - 8 - 012/a/zl page 5 of 12
spe - 12 - 8 - 012/a/zl page 6 of 12 c. smith chart data figure 5 . smith chart f or the fxp72 antenna . d. gain data figure 6 . gain for the fxp72 antenna .
spe - 12 - 8 - 012/a/zl page 7 of 12 e. efficiency data figure 7 . efficiency for the fxp 72 antenna . f. radiation pattern data . figure 8 . radiation pattern xz plane at 2.44 ghz, figure 1 as reference.
spe - 12 - 8 - 012/a/zl page 8 of 12 figure 9. radiation pattern xy plane at 2.44 ghz, figure 1 as reference. figure 10 . radiation pattern y z plane at 2.44 ghz, figure 1 as reference.
spe - 12 - 8 - 012/a/zl page 9 of 12 v. mechanical drawing
spe - 12 - 8 - 012/a/zl page 10 of 12 vi. mounting guidelines this versatile antenna design is suitab le for cases where there is no t enough space for a thicker antenna. fxp72 can be right next to the device main board. this antenna use s the device main board as a ground plane thr ough a capacitive coupling effect and keeping antenna characteristics. the only restriction for this design is the radiated elements of the antenna must be free of metal. in the next figure 12 is shown the minimum clearance necessary for the antenna and on figure 13 the non - desired main board shape on the antenna section. the siz e of the ground plane used on the testing is 40x60 mm and was allocated as in figure 12. figure 12 . mounting guidelines. the size and shape of the ground plane can change. the only restrictions to get maximum performance are that the antenna must be allocated along the shortest edge of the device board, and the ground plane on that edge must have a flat shape horizontally, in order words the ground plane can not come around of the antenna sides on that section. the next figure 13 shows a non desired g round plane environment.
spe - 12 - 8 - 012/a/zl page 11 of 12 figure 13 . not recommend ground plane. the size of the ground plane used on the testing had a dimension of 40x60 mm, see next figure 14. the antenna was placed in the center of one shortest edge. the antenna was in between the abs plastic and ground plane, having a clearance of 8 mm. the antenna was tested into the satimo system chamber and with a network analyzer. the antenna was also tested on in free space, just the antenna stuck out on the abs plastic of 1.5 mm of thickness .
spe - 12 - 8 - 012/a/zl page 12 of 12 figure 14 . ground p lane test set up.

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