mrf24j40 Microchip Technology Inc., mrf24j40 Datasheet - Page 51

• Manufacturer Part Number: mrf24j40
• Description: Ieee 802.15.4? 2.4 Ghz Rf Transceiver
• Manufacturer: Microchip Technology Inc.

FIGURE A-5:
The most critical part of maintaining proper impedance
is adhering to the specified dimensions of the printed
circuit board antenna (see Figure A-6). The antenna
dimensions, if altered, will change the specified imped-
ance. As an example, a 1 mm variance will shift the
impedance by 5-10 MHz.
FIGURE A-6:
© 2006 Microchip Technology Inc.
1.0
IMPEDANCE OF THE PCB ANTENNA WITH VOLTAGE STANDING WAVE RATIO
PRINTED CIRCUIT BOARD ANTENNA DIMENSIONS
8.6
5.3
Advance Information
1.2
0.85
0.72
1.0
6.0
Note:
3.8
1.54
22.0
1.0
This part has been simulated using a
HFSS™ simulator provided by Ansoft
Corporation.
0.5
1.3
1.0
3.82
4.2
MRF24J40
1.2
4.3
DS39776A-page 49
1.0
6.6