RN171 datasheet(13/30 Pages) MICROCHIP

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 2014-2016 Microchip Technology Inc.

DS70005171B-page 13

RN171

TABLE 3-1:

TESTED EXTERNAL

ANTENNA TYPES

3.2.1

PCB TRACE ANTENNA

Modular certification of the RN171 module was

performed with the PCB trace antenna shown in

Figure 3-4. The exact dimensions of the trace antenna

must be followed. Gerber files for the PCB trace

antenna are available on the RN171 product web page

on the Microchip web site at http://www.micro-

chip.com/rn171.

FIGURE 3-4:

PCB TRACE ANTENNA

3.2.2

CHIP ANTENNA

Modular certification of the RN171 module was pre-

formed with the fractus (http://www.fractus.com) chip

antenna part number FR05-S1-N-0-104. Peak gain

listed in the data sheet is 1.07 dBi. Any chip antenna

type may be used with the RN171 module provided the

gain is equal to or less than 1.07 dBi, and having similar

in-band and out-of-band radiation patterns as the frac-

tus antenna. For proper operation of the chip antenna,

refer to the data sheet for PCB footprint details and

mounting considerations.

3.2.3

WIRE ANTENNA

Modular certification of the RN171 module was per-

formed with the wire antenna shown in Figure 3-5.

FIGURE 3-5:

WIRE ANTENNA

The antenna is an 18-gauge wire with a length of 1 inch

± 0.25. For best performance, the wire antenna should

be perpendicular to a generous ground plane, prefera-

bly at least ¼ wavelength of 2.4 GHz (1.2 inches/30

mm).

3.2.4

WHIP ANTENNA

Modular certification of the RN171 module was per-

formed with a whip antenna with a peak gain of 2.2 dBi.

Any whip antenna type may be used with the RN171

module provided the gain is equal to or less than 2.2

dBi, and having similar in-band and out-of-band radia-

tion patterns. Connection to the whip antenna can be

by a U.FL. Figure 3-6 shows a suggested PCB layout

for a U.FL connector.

FIGURE 3-6:

U.FL CONNECTOR

Type

Gain

PCB Trace

0 dBi

Chip

1.07 dBi

Wire

0 dBi

Whip

2.2 dBi

Note 1:

An antenna type comprises antennas

having similar in-band and out-of-band

radiation patterns.

Dimensions are in inches.

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