MRF24J40MB-I/RM Microchip Technology, MRF24J40MB-I/RM Datasheet - Page 17

• Manufacturer Part Number: MRF24J40MB-I/RM
• Description: IC TXRX 2.4GHZ 802.15.4
• Manufacturer: Microchip Technology

Specifications of MRF24J40MB-I/RM

• Frequency: 2.4GHz
• Data Rate - Maximum: 250kbps
• Modulation Or Protocol: 802.15.4
• Applications: ISM
• Power - Output: 20dBm
• Sensitivity: -102dBm
• Voltage - Supply: 2.4V ~ 3.6V
• Current - Receiving: 25mA
• Current - Transmitting: 130mA
• Data Interface: PCB, Surface Mount
• Antenna Connector: On-Board, Trace
• Operating Temperature: -40°C ~ 85°C
• Package / Case: Module
• Wireless Frequency: 2.405 GHz to 2.475 GHz
• Interface Type: SPI
• Security: 128 bit AES
• Operating Voltage: 3.3 V
• Output Power: + 20 dBm
• Antenna: PCB Trace
• Operating Temperature Range: - 40 C to + 85 C
• Modulation Type: O-QPSK
• Data Rate Max: 250Kbps
• Module Interface: SPI, 4-Wire
• Supply Voltage Range: 2.4V To 3.6V
• Sensitivity (dbm): -102dBm
• Supply Current: 130mA
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Memory Size: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

2.3
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
full-wave solver software by Ansoft Corporation
FIGURE 2-8:
 2009 Microchip Technology Inc.
Note 1:
PCB Antenna
1.0
Dimensions are in mm and tolerance is +/– 0.05 mm.
PCB ANTENNA DIMENSIONS
8.6
®
and HFSS™ 3D
5.3
1.2
0.85
Preliminary
0.72
1.0
(www.ansoft.com) and tested in an anechoic room. The
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.
6.0
2.0
3.8
1.54
22.0
1.0
0.5
1.3
MRF24J40MB
1.0
3.82
9.6
4.2
6.6
1.2
4.3
DS70599B-page 15
1.0
6.6