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RN-171-DS Datasheet(PDF) 11 Page - Microchip Technology |
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RN-171-DS Datasheet(HTML) 11 Page - Microchip Technology |
11 / 16 page www.rovingnetworks.com Version 3.21 10/2/2012 11 RN -17 1 The feed connecting the antenna to the RF pad must be 50 ohm in impedance. If this feed is shorter than 0.2" the board can be 2 layers and the thickness of the feed is the same as described in the manufacturer’s data sheet. If the trace is longer, you need a 4-layer board with controlled impedance, i.e., a ground plane directly under the top layer. The thickness should be calculated accordingly. Wire Antenna To implement a wire antenna, drill a hole through the board on the RF pad (pin 24) to place the wire antenna. To provide 50 ohms of impedance matching, the RF path from the RF pad (Pin 24) to the location of the wire antenna should be 12 mils thick on a 4-layer PCB. See Figure 11. Roving Networks recommends that you use an 18-gauge wire with a length of 1 inch ± 0.25. For best performance, the wire antenna should be perpendicular to the ground plane. NOTE: There should be no thermal relief connectors on GND for RF path and on the ground plane. Figure 11. Wire Antenna Location U.FL Connector Figure 12 shows one option for implementing a U.FL connector. The trace from the RF pad to the U.FL connector should be 12 mils thick to achieve 50 ohms of impedance matching on a 4-layer board. The part number of the U.FL connector used for certification of the module is U.FL-R-SM from Hirose. 28 29 30 31 32 21 22 23 24 25 26 27 20 19 18 17 16 A1 |
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