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MRF24J40MB
2.3
PCB Antenna
(www.ansoft.com) and tested in an anechoic room. The
The PCB antenna is fabricated on the top copper trace.
Figure 2-8 shows the trace dimensions. The layers
below the antenna have no copper traces. The ground
and power planes under the components serve as a
counterpoise to the PCB antenna. Additional ground
plane on the host PCB will substantially enhance the
performance of the module. For best performance,
place the module on the host PCB following the
recommendations in Section 1.2 “Mounting Details” .
The Printed Circuit Board (PCB) antenna was designed
and simulated using Ansoft Designer ? and HFSS? 3D
full-wave solver software by Ansoft Corporation
design goal was to create a compact, low-cost antenna
with the best radiation pattern. Figure 2-9 shows the
simulation drawing and Figure 2-10 and Figure 2-11
show the 2D and 3D radiation patterns, respectively. As
shown by the radiation patterns, the performance of the
antenna is dependant upon the orientation of the
module. Figure 2-12 shows the impedance simulation
and Figure 2-13 shows the SWR simulation. The
discrete matching circuitry matches the impedance of
the antenna with the MRF24J40 transceiver IC.
FIGURE 2-8:
PCB ANTENNA DIMENSIONS
1.0
8.6
6.0
22.0
1.3
4.2
5.3
0.85
2.0
3.8
1.54
0.5
3.82
9.6
4.3
1.0
6.6
1.2
1.2
1.0
2.0
1.0
1.0
6.6
0.72
Note 1:
Dimensions are in mm and tolerance is +/– 0.05 mm.
? 2009 Microchip Technology Inc.
Preliminary
DS70599B-page 15
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