User's Manual

HF-A21-SMT Embedded WiFi Module User Manual
Shanghai High-Flying Electronics Technology Co., Ltd
www.hi-flying.com
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1.2.2. Mechanical Size
HF-A21-SMT modules physical size as follows:
Figure 3. HF-A21-SMT Mechanical Dimension
1.2.3. On-board Chip Antenna
HF-A21-SMT module support internal ob-board chip antenna option. When costomer select
internal antenna, you shall comply with following antenna design rules and module location
suggestions:
 For customer PCB, RED color region (7.5x25mm) can‟t put componet or paste GND net;
 Antenna must away from metal or high components at least 10mm;
 Antenna can‟t be shieldedby any meal enclosure; All cover, include plastic, shall away
from antenna at least 10mm;
Figure 4. HF-A21-SMT Chip Antenna Keep Out Region
High-Flying suggest HF-A21-SMT module better locate in following region at customer board,
which to reduce the effect to antenna and wireless signal, and better consult High-Flying technical
people when you structure your module placement and PCB layout.