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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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RN171 датащи(PDF) 12 Page - Microchip Technology |
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RN171 датащи(HTML) 12 Page - Microchip Technology |
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12 / 30 page  RN171 DS70005171B-page 12 2014-2016 Microchip Technology Inc. FIGURE 3-2: RN171 APPLICATION SCHEMATIC – BATTERY BOOST POWER MODE FIGURE 3-3: IN-SYSTEM PROGRAMMING (ISP) HEADER 3.2 External Antenna Types The RN171 module has a 50Ω antenna connection on pin 24. Connect to an antenna through a host PCB micro-strip trace layout to an external connector, PCB trace antenna, or component (chip) antenna. This trace can be extended to include passive parts for antenna attenuation padding, impedance matching, or to pro- vide test ports. Other components, such as amplifiers and active drivers, are not considered part of the trace layout and may void the RN171’s modular certification. It is recommended that the trace layout from pin 24 to the external connector or antenna be as short as pos- sible for minimum loss and best impedance matching. If the trace layout is longer, it should be a 50Ω imped- ance microstrip or coplanar waveguide PCB trace. Adjacent ground pins 21-23 and 25-27 should be con- nected to a low-impedance ground plane on the host PCB. Modular certification of the RN171 module was per- formed with the external antenna types listed in Table 3-1. An antenna type comprises antennas having similar in-band and out-of-band radiation patterns. Refer to Section 4.0, Regulatory Approval for specific regulatory requirements by country. |
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