Datasheet

RN171
DS70005171A-page 12  2014 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 50 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 50 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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