MRF24WN0MB datasheet(16/36 Pages) MICROCHIP

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MRF24WN0MA/MB

DS50002410A-page 16

Advance Information

 2015 Microchip Technology Inc.

3.2

Integral PCB Trace Antenna

For the MRF24WN0MA, the PCB antenna is fabricated

on the top copper layer and covered in solder mask.

The layers below the antenna do not have copper

trace.

It is recommended that the module is mounted on the

edge of the host PCB. It is permitted for PCB material

to be below the antenna structure of the module as long

as no copper traces or planes are on the host PCB in

that area. For best performance, place the module on

the host PCB according to the details shown in

Figure 1-6.

The antenna patterns plotted in Figure 3-2 through

Figure 3-5 are the simulated results of the PCB

antenna.

Figure 3-2 illustrates the simulation drawing. The two-

dimensional (2D) radiation pattern is illustrated in

Figure 3-3, whereas Figure 3-4 and Figure 3-5 shows

the three-dimensional (3D) radiation patterns.

The calculated average of the radiated field is shown in

Figure 3-3. The radiation pattern for the XZ plane is

shown in red, whereas the YZ plane is shown in violet.

The most powerful radiation occurs in the XZ plane as

represented by the red pattern.

Figure 3-4 shows the relative position of the 3D radia-

tion “donut” with reference to the module orientation.

This is a very useful guide for placement of the module

to obtain the maximum range.

Figure 3-5 shows the 3D radiation pattern with the col-

ored distribution of the radiation magnitude. The values

range from -9 dB to +0.3 dB. This is very useful in inter-

preting the 2D radiation pattern.

FIGURE 3-2:

PCB ANTENNA SIMULATION DRAWING

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