mrf89xam8a Microchip Technology Inc., mrf89xam8a Datasheet - Page 16

• Manufacturer Part Number: mrf89xam8a
• Description: 868 Mhz Ultra-low Power Sub-ghz Transceiver Module
• Manufacturer: Microchip Technology Inc.

MRF89XAM8A
FIGURE 2-9:
2.3
The PCB antenna is fabricated on the top copper trace.
Figure 2-10
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 by following the
recommendations given in the
Details.
The PCB antenna was designed and simulated using
Ansoft Designer
software by ANSYS Inc. (www.ansoft.com). The goal of
the design was to create a compact, low-cost antenna
with the best radiation pattern.
the
Figure 2-13
patterns. As shown by the radiation patterns, the
performance of the antenna is dependant upon the
orientation of the module.
impedance simulation and
simulated PCB antenna VSWR. The discrete matching
circuitry matches the impedance of the antenna with
the SAW filter and MRF89XA transceiver IC.
DS70651A-page 14
simulation
PCB Antenna
illustrates the trace dimensions. The layers
illustrates the 2D and 3D radiation
®
drawing
and HFSS™ 3D full-wave solver
PCB LAYER STACK UP
± 0.005”
0.032”
Figure 2-14
Figure 2-15
and
Section 1.2, Mounting
Figure 2-11
Figure 2-12
1/2 oz. Copper
1/2 oz. Copper
1/2 oz. Copper
1/2 oz. Copper
illustrates the
illustrates the
12 mil FR4
8 mil FR4
8 mil FR4
illustrates
and
Preliminary
FIGURE 2-10:
2.5mm
8.4mm
Top Copper
Ground Plane
Power Plane
Bottom Copper
PCB ANTENNA
DIMENSIONS
16.8mm
© 2010 Microchip Technology Inc.
1.0mm
1.1mm
0.5mm