ATSAM4S-WPIR-RD Atmel, ATSAM4S-WPIR-RD Datasheet - Page 24

• Manufacturer Part Number: ATSAM4S-WPIR-RD
• Description: Development Boards & Kits - ARM SAM4S16 W.PIR CAMERA REF. DESIGN
• Manufacturer: Atmel

Specifications of ATSAM4S-WPIR-RD

• Rohs: yes
• Product: Reference Designs
• Tool Is For Evaluation Of: ATSAM3S4BA
• Core: ARM Cortex M3
• Interface Type: JTAG, USB
• Operating Supply Voltage: 5 V
• Data Bus Width: 32 bit
• For Use With: RF231USB-RD

5.4.1
Figure 5-7. Board layout – matching circuit schematic.
Figure 5-8. Board layout – antenna dimension.
Antenna tuning
The behavior of a radiation device depends on the application environment. In this case the USB dongle was optimized
to be plugged directly into an USB port of a laptop. The fact that available laptops have different positions and numbers
on USB ports will be neglected.
For antenna measurement the balun was removed
to the balun unbalanced pin (pad 1) to interconnect the RF line with a network analyzer (NWA).
50Ohm
50Ohm
Matching network
i
i
L2
1.5nH
1.0mm
2.2nH
L3
n.b.
C41
3.0mm
3.08mm
Atmel AVR2030: ATRF231USB – Hardware User Manual [APPLICATION NOTE]
ANT1
2450AT43B100
GND
GND
Copper cut out area
Ground copper area
Ground vias
(Figure
1.03mm
5-9). Instead a rigid cable with SMA connector was soldered
42018A−AVR−08/2012
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