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s pe - 12 - 8 - 012/d /zl page 1 of 13 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 13 1. introduction the fxp72 freedom 2.4ghz anten na 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 clearan ce 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 plas tic 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 condi tions. 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 slightly higher peak gain antenna than mentioned on the module specification to compensate for t his 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 can be assured you are meeting regulatory requirements for that module.
s pe - 12 - 8 - 012/d /zl page 3 of 13 for example, a mod ule 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 sl ightly higher free - space peak gain of 3dbi or more if available. once that antenna gets integrated into your device, performance will degrade below this 2dbi peak gain due to the effects of gnd plane, surrounding components, and device housing. to ensure a ntenna performance contact taoglas for testing services. choosing a taoglas antenna with a higher peak gain than what is specified by the module manufacturer and enlisting our help will ensure you are getting the best performance possible without exceeding the peak gain limits.
s pe - 12 - 8 - 012/d /zl page 4 of 13 2. specifications electrical communication system bluetooth wifi zigbee 2.4ghz 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 v swr 2.0:1 polarization linear power handled 5 w mechanical 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 color 53 mm, black environmental operation temperature - 40 oc ~ + 85 oc storage temperature - 40 oc ~ +85 oc rohs compliant yes adhesive 3m 467
s pe - 12 - 8 - 012/d /zl page 5 of 13 3. antenna characteristics 3.1. test setup 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 6 of 13 3.2. a ntenna 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. 3.3. return loss figure 3. return loss for the fxp72 antenna. 3.4. vswr figure 4. vswr for the fxp72 antenna.
s pe - 12 - 8 - 012/d /zl page 7 of 13 3.5. smith chart figure 5. smith chart for the fxp72 antenna. 3.6. gain figure 6. gain for the fxp72 antenna.
s pe - 12 - 8 - 012/d /zl page 8 of 13 3.7. efficiency figure 7. effici ency for the fxp72 antenna. 3.8. radiation pattern s figure 8. radiation pattern xz plane at 2.44 ghz, figure 1 as reference.
s pe - 12 - 8 - 012/d /zl page 9 of 13 figure 9. radiation pattern xy plane at 2.44 ghz, figure 1 as reference. figure 10. radiation pattern yz plane at 2.44 ghz, fi gure 1 as reference.
s pe - 12 - 8 - 012/d /zl page 10 of 13 4. mechanical drawings (unit: mm)
s pe - 12 - 8 - 012/d /zl page 11 of 13 5. 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 main 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 figure 12 is shown the minimum c learance 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. mounting guidelines.
s pe - 12 - 8 - 012/d /zl page 12 of 13 the size and s hape 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. 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.
s pe - 12 - 8 - 012/d /zl page 13 of 13 figure 14. ground plane test set up. taoglas makes no warranties based on the accuracy or completeness of the contents of this document and reserves the right to make changes to specifications and product descriptions at any time without notice. taoglas reserves all rights to this document and the information contained herein. reproduction, use or disclosure to third parties without express permission is strictly prohibited. copyright ? taoglas ltd.

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