User's Manual

DFZM-E72xx
Data Sheet Sheet 31 of 40 Sep 16, 2013
Proprietary Information and Specifications are Subject to Change
6-2.Layout Guidelines
Figure 6-3: DFZM-E72xx module onboard antenna keep-out layout guidelines (in mm)
Notes:
1. All Dimensions are in mm. Tolerances shall be ±0.10 mm.
2. Absolutely no metal trace or ground layer underneath this area.
3. It is recommended not to run circuit traces underneath the module.
4. In performing SMT or manual soldering of the module to the base board, please align the two row of pins.
In addition to the guidelines in Figure 6-3, note the following suggestions:
DFZM-E72xx
• External Bypass capacitors for all module supplies should be as close as possible to the module pins.
• Never place the antenna very close to metallic objects.
• The external dipole antennas need a reasonable ground plane area for antenna efficiency.
DFZM-E7221; DFZM-E7211 onboard antenna specific
 The onboard antenna keep out area, as shown in Figure 6-3, must be adhered to. In addition it is
recommended to have clearance above and below the PCB trace antenna (Figure 6-4) for optimal range
performance.
Keep out area for onboard antenna. All layers on the
PCB must be clear.
(i.e. No GND, Power trace/plane, traces.)
Note: If guidelines are not followed, DFZM-E72xx
range with onboard antenna will be compromised.