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

4.2 470-MHz Smith chart, SWR, Bandwidth, and Efficiency

Figure 4-5 shows the theoretical Smith chart for matching the antenna for single-band 470 MHz with a theoretical SWR of 1.025

GUID-20211124-SS0I-VHPW-CJQQ-MNVJ4C9KSKZW-low.pngFigure 4-5 Theoretical Smith Chart for Single-Band 470-MHz Matching

Further tuning of the resonance of the antenna was needed after realizing the theoretical match. Figure 4-6 and Figure 4-7 shows the resulting impedance and SWR which at 1.074 is less than the threshold for a good match of SWR < 2.0. Table 4-2 shows the BOM with components used to relies the matching network given in Figure 1-2.

The bandwidth of the antenna defined by SWR < 2.0 can be seen in Figure 4-7 to be 490-465 = 25 MHz.

Table 4-2 Matching Network BOM for 470-MHz Single-Band Operations
Ref. DesignatorMurata Part NumberValue
Z600 Ω
Z61

DNM

Z62GRM0335C1H5R1CA015.1 pF
Z63LQP03TN6N2B026.2 nH
Z64LQP03TN39NH0239 nH
Figure 4-6 Smith Chart of Antenna Matched for 470-MHz Single Band.
Figure 4-7 SWR Measurement of 470 MHz and Bandwidth at SWR < 2

Figure 4-8 shows the radiation pattern of the antenna matched for 470 MHz radiating at 13 dBm 470 MHz. The figure shows a TRP of 8.06 dBm, this with a measured conducted output power of 12.65 dBm gives us an efficiency of 34.8%.

Figure 4-8 Radiation Pattern of the Antenna Matched for 470-MHz Radiating with 13 dBm 470-MHz Setting