Texas Instruments SimpleLink CC3220MOD Series Manual page 70

CC3220MOD, CC3220MODA
SWRS206E – MARCH 2017 – REVISED MAY 2021
10.3.2.1 Antenna Placement and Routing
The antenna is the element used to convert the guided waves on the PCB traces to the free space
electromagnetic radiation. The placement and layout of the antenna are the keys to increased range and data
rates. Table 10-2 provides a summary of the recommended antennas to use with the CC3220MODx module.
SR NO.
1
2
3
4
5
6
7
8
9
Table 10-3 lists the recommended antennas to use with the CC3220MODx module. Other antennas may be
available for use with the CC3220MODx modules. See the
CHOICE PART NUMBER
1 AH316M245001-T
10.3.2.2 Transmission Line Considerations
The RF signal from the module is routed to the antenna using a Coplanar Waveguide with ground (CPW-G)
structure. CPW-G structure offers the maximum amount of isolation and the best possible shielding to the
RF lines. In addition to the ground on the L1 layer, placing GND vias along the line also provides additional
shielding.
Figure 10-4 shows a cross section of the coplanar waveguide with the critical dimensions.
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Table 10-2. Antenna Guidelines
Place the antenna on an edge or corner of the PCB.
Ensure that no signals are routed across the antenna elements on all the layers of the
PCB.
Most antennas, including the chip antenna used on the LaunchPad
clearance on all the layers of the PCB. Ensure that the ground is cleared on inner layers
as well.
Ensure that there is provision to place matching components for the antenna. These
must be tuned for best return loss when the complete board is assembled. Any plastics
or casing must also be mounted while tuning the antenna because this can impact the
impedance.
Ensure that the antenna impedance is 50 Ω because the module is rated to work only
with a 50-Ω system.
In case of printed antenna, ensure that the simulation is performed with the solder mask
in consideration.
Ensure that the antenna has a near omnidirectional pattern.
The feed point of the antenna is required to be grounded. This is only for the antenna
type used on the CC3220MODx Launchpad. See the specific antenna data sheets for
the recommendations.
To use the FCC certification of the module, refer to the
Certifications wiki page on CC3220MODx Radio certification
Table 10-3. Recommended Components
MANUFACTURER
Figure 10-4. Coplanar Waveguide (Cross Section)
Product Folder Links:
GUIDELINES
CC3120 and CC3220 Radio
CC3120 and CC3220 Radio Certifications
Can be placed on edge of the PCB and uses much
Taiyo Yuden
less PCB space
CC3220MOD CC3220MODA
www.ti.com
™ , require ground
wiki page.
NOTES
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