AC530 Fastrax, AC530 Datasheet - Page 30

• Manufacturer Part Number: AC530
• Description: GPS Development Tools Application Board for UC530
• Manufacturer: Fastrax

Specifications of AC530

• Rohs: yes
• Product: Application Boards
• Tool Is For Evaluation Of: UC530
• Frequency: 1.575 GHz
• Operating Supply Voltage: 3.3 V
• Interface Type: UART
• Description/function: Fastrax Application Board AC530 provides the UC530 connectivity to the Fastrax Evaluation Kit or to other evaluation purposes
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Operating Supply Current: 25 mA

Page 30 of 39
53mm width reduces signal levels by 2dB when compared to full 80x40mm ground plane dimensions. Radiation
pattern of the embedded GPS antenna is shown in the picture below (on 80x40mm ground plane).
Figure 16 Radiation pattern of the embedded antenna, 80x40mm ground plane
Avoid placement of the module at a corner of the mother board. This will reduce radiation efficiency and cause
frequency shifts. Optimal placement is at center of top edge; keep at least 10mm distance to nearest ground plane
corner.
Placement of tall nearby components (h>3mm) should keep minimum d=6mm distance to the embedded antenna.
Also any adjacent conductive metal plane should have d=6mm distance to the top edge of the module. Enclosure
or plastic cover should have minimum d=1.5mm distance to the antenna.
Placement near human body (or any biological tissue) is accepted by keeping minimum d=10mm distance between
mother board and the body. With smaller distances to the body, the radiation efficiency of the antenna will start
to reduce due to signal losses in biological tissue. E.g. d=5mm to biological tissue will reduce GPS signal levels by
about 6dB. Note also that the body will act also as a reflector and thus radiation pattern will point perpendicular
to the body.
2012-05-03
UC530_Datasheet