SWRA730 February   2022 CC1311P3 , CC1311R3 , CC1312R , CC1312R7 , CC1314R10 , CC1352P , CC1352P7 , CC1352R , CC1354P10 , CC1354R10

 

  1.   Trademarks
  2.   Acronyms
  3. 1Description of the PCB Antenna
    1. 1.1 Implementation of the PCB Meander Monopole Antenna
    2. 1.2 Matching Network
  4. 2Test Setup
    1. 2.1 Radiation Pattern
  5. 3Unmatched Results
    1. 3.1 Smith Chart – Natural Impedance without Antenna Match Components
    2. 3.2 Smith Chart – Impedance with external component Z64
      1. 3.2.1 433 MHz Unmatched
      2. 3.2.2 470 MHz Unmatched
      3. 3.2.3 490 MHz Unmatched
      4. 3.2.4 510 MHz Unmatched
      5. 3.2.5 868/915 MHz Unmatched
  6. 4Single-Band Matching and Result
    1. 4.1 433-MHz Smith chart, SWR, Bandwidth, and Efficiency
    2. 4.2 470-MHz Smith chart, SWR, Bandwidth, and Efficiency
    3. 4.3 490-MHz Smith Chart, SWR, Bandwidth, and Efficiency
    4. 4.4 510-MHz Smith Chart, SWR, Bandwidth, and Efficiency
    5. 4.5 868/915-MHz Smith Chart, SWR, Bandwidth, and Efficiency
  7. 5Dual Band Matching and Results
    1. 5.1 433-MHz and 2440-MHz Smith Chart, SWR, Bandwidth, and Efficiency
    2. 5.2 470-MHz and 2440-MHz Smith Chart, SWR, Bandwidth and Efficiency
    3. 5.3 490 MHz and 2440 MHz Smith Chart, SWR, Bandwidth and Efficiency
    4. 5.4 510-MHz and 2440-MHz Smith Chart, SWR, Bandwidth, and Efficiency
    5. 5.5 868/915 and 2440-MHz Smith Chart, SWR, Bandwidth, and Efficiency
  8. 6Summary - Bill of Materials and Results
  9. 7Conclusion
  10. 8References

1.1 Implementation of the PCB Meander Monopole Antenna

To obtain optimum performance, it is important to make an exact copy of the antenna dimensions. The antenna was implemented on a 1.6-mm thick FR4 substrate. Since there is no ground plane beneath the antenna, the PCB thickness is not critical. If a different thickness is used then it could be necessary to change the matching network to obtain optimum performance.

One approach to implement the antenna in a PCB CAD tool is to import the antenna layout from a Gerber file. Refer to files included in the LAUNCHXL-CC1352P-4 Reference Design.

If the antenna is implemented on a PCB that is wider than the antenna it is important to avoid placing components or having a ground plane close to each side of the antenna. If the CAD tool being used does not support import of Gerber files, Figure 1-1 and Table 1-1 can be used.

GUID-20220119-SS0I-VSNC-4CBZ-DH6GKGGVTNCW-low.pngFigure 1-1 LAUNCHXL-CC1352P-4
Table 1-1 Antenna Dimensions
L116.0 mmL5

7.0 mm

L22.0 mmL6

1.4 mm

L324.0 mmL73.0 mm
L438.0 mmW2.0 mm

The last antenna segment's optimum length will always be dependent on the geometry of the ground plane. For ground plane sizes smaller than the LAUNCHXL-CC1352P-4 (less than a quarterwave), the optimum length of the last segment could be increased or the antenna match re-calculated for the new ground plane size.