SWRA730 February 2022 CC1311P3 , CC1311R3 , CC1312R , CC1312R7 , CC1314R10 , CC1352P , CC1352P7 , CC1352R , CC1354P10 , CC1354R10
Figure 3-11 and Figure 3-12 shows the Smith chart and SWR after placing 2 pF capacitor on Z64 to support the 868/915 MHz frequency (keeping Z60–Z63 unchanged). Since the bandwidth of the antenna is great enough to support both 868 and 915 MHz the resonance of the antenna was tuned for ((915+896) / 2 ≈) 892 MHz.