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s pe - 12 - 8 - 012/ d /zl page 1 of 12 specification part no. : fxp7 2 .07.0053a 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
s pe - 12 - 8 - 012/ d /zl page 2 of 12 1. overview the fxp72 freedom 2.4g hz 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 no 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. many module manufacturers specify peak gain limits for any antennas that are to be connected to that module. those peak gain limits are based on free - space conditions. in practice, the peak gain of an antenna tested in free - space can degrade by at least 1 or 2dbi when put inside a device. so ideally you should go for a slightl y higher peak gain antenna than mentioned on the module specification to compensate for this effect, giving you better performance. upon testing of any of our antennas with your device and a selection of appropriate layout, integration technique, or cable , taoglas can make sure any of our antennas peak gain will be below the peak gain limits. taoglas can then issue a specification and/or report for the selected antenna in your device that will clearly show it complying with the peak gain limits, so you ca n be assured you are meeting regulatory requirements for that module. for example, a module manufacturer may state that the antenna must have less than 2dbi peak gain, but you dont need to select an embedded antenna that has a peak gain of less than 2dbi in free - space. this will give you a less optimized solution. it is better to go for a slightly higher free - space peak gain of 3dbi or more if available. once that antenna gets integrated into your device, performance will degrade below this
s pe - 12 - 8 - 012/ d /zl page 3 of 12 2dbi peak gain due to the effects of gnd plane, surrounding components, and device housing. if you want to be absolutely sure, contact taoglas and we will test. choosing a taoglas antenna with a higher peak gain than what is specified by the module manufacturer and enli sting our help will ensure you are getting the best performance possible without exceeding the peak gain limits. 2. antenna characteristics parameter multi - standard communication system bluetooth wifi zigbee 2.4gh z ism 2401 - 2480 2412 - 2462 2410 - 2480 2400 - 2483.5 efficiency 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 weight 1.2 g connector mhfi (u.fl compatible) cable standard mini - coax 1.13 mm cable length and col or 53 mm, black rohs compliant yes adhesive 3m 467
s pe - 12 - 8 - 012/ d /zl page 4 of 12 3. test set up a satimo sg24 3d scan system with anechoic chamber. figure 1. satimo system. agilent 8753es vector network analyzer. figure 2. network analyzer. y x z
s pe - 12 - 8 - 012/ d /zl page 5 of 12 4. 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 radiation patterns were measured in the reliable satimo 3d scan system. 4.1 . return loss data figure 3. return loss for the fxp72 antenna. 4.2 . vswr data figure 4. vswr for the fxp72 antenna.
s pe - 12 - 8 - 012/ d /zl page 6 of 12 4.3 . smith chart data figure 5. smith chart for the fxp72 antenna. 4.4 . gain data figure 6. gain for the fxp72 antenna.
s pe - 12 - 8 - 012/ d /zl page 7 of 12 4.5 . efficiency data figure 7. efficiency for the fxp72 antenna. 4.6 . radiation pattern data . figure 8. radiation pattern xz plane at 2.44 ghz, figure 1 as reference.
s pe - 12 - 8 - 012/ d /zl page 8 of 12 figure 9. radiation pattern xy plane at 2.44 ghz, figure 1 as reference. figure 10. ra diation pattern yz plane at 2.44 ghz, figure 1 as reference.
s pe - 12 - 8 - 012/ d /zl page 9 of 12 5. mechanical drawing
s pe - 12 - 8 - 012/ d /zl page 10 of 12 6. mounting guidelines this versatile antenna design is suitable for cases where there is no t enough space for a thicker antenna. fxp72 can be right next to the device mai n board. this antenna use s the device main board as a ground plane through 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 f igure 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 size of the ground plane used on the testing is 40x60 mm and was allocated as in figure 12. figure 12. mountin g guidelines.
s pe - 12 - 8 - 012/ d /zl page 11 of 12 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 ground plane environment. figure 13. not recommend ground plane.
s pe - 12 - 8 - 012/ d /zl page 12 of 12 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 chamb er 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. figure 14. ground plane test set up.

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