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SS12-TPCT-ND bảng dữ liệu(PDF) 8 Page - Microchip Technology |
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SS12-TPCT-ND bảng dữ liệu(HTML) 8 Page - Microchip Technology |
8 / 16 page www.rovingnetworks.com Version 3.21 10/2/2012 8 RN -17 1 DESIGN CONCERNS The following sections provide information on designing with the RN-171 module, including antenna design, solder reflow, boost regulator, etc. Antenna Design The RN-171 supports several antenna designs, including a PCB trace antenna, chip antenna, wire antenna, and U.FL connector. PCB Trace Antenna Figure 6 shows Roving Networks’ recommended PCB trace antenna pattern. The antenna ground should be connected to the ground plane and/or ground polygon on both the top and bottom layers with at least 2 vias. The ground plane should come close to the antenna, exactly as shown in Figure 6; the distance is critical. There should be no ground place/trace under the antenna under any circumstances. The antenna feed goes through the polygon on a 50-ohm impedance trace to the source of the signal. Unless the antenna trace is exactly 50 ohms and the source has a 50-ohm output impedance, you should use a matching PI filter (2 capacitors and an inductor). The left side of the antenna should be placed on the PCB edge. If that is not possible, leave at least 1 inch of clearance from any trace or ground plane. The top and bottom of the antenna (the shorter side) should be placed on the PCB edge or should have at least 1-inch clearance from any trace or ground plane. To control the impedance of the antenna feed the board should be 4 layers with a dedicated ground plane and a thickness of around 8 - 14 mils between the ground plane and the top layer (where the antenna feed is routed). A 2-layer board would not be thin enough to obtain the desired impedance using an acceptable trace width. Figure 6. PCB Trace Antenna Pattern Antenna Feed Antenna Ground |
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Mô tả tương tự - SS12-TPCT-ND |
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