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RN4871 Datasheet(PDF) 17 Page - Microchip Technology |
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RN4871 Datasheet(HTML) 17 Page - Microchip Technology |
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17 / 48 page  2016 Microchip Technology Inc. DS50002489A-page 17 RN4870/71 4.3 RN4871 Module Figure 4-7 shows the physical dimensions of the RN4871 module. Figure 4-8 illustrates the recom- mended PCB layout, and Figure 4-9 shows the recom- mended mounting details. Ensure that there is no top copper layer near the test pin area, indicated by the shaded keep out areas, as shown in Figure 4-8. When laying out the host PCB, the areas under the antenna must not contain any top, inner layer, or bottom copper as shown in Figure 4-9. A low-impedance ground plane ensures the best radio performance (best range; lowest noise). Figure 4-9 also shows a space area around antenna section for best antenna performance. The ground plane can be extended beyond the minimum recommended as required for host PCB EMC noise reduction. For best range performance, keep all external metal at least 30 mm away from the ceramic chip antenna. FIGURE 4-7: RN4871 MODULE DIMENSIONS |
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