Texas Instruments Chipcon CC2400DBK, Руководство пользователя, Страница: 5 / 31

SWRU048 Page 5 of 30
quarter wavelength (
λ
/4). A reduction of the antenna height (H) will in general decrease the
antenna bandwidth. Please see figure 3 for the antenna dimensions.
Figure 2: Antenna dimensions
The height of the antenna is defined as the distance from the ground plane to the parallel
section, and the length is from the end of the antenna parallel section to the feed point.
Length: L = (26.19 mm – 9.19 mm + 1.22 mm x ½) = 17.61 mm
Height: H = (6.17 mm + 0.97 mm - 1.19 mm x ½) = 6.55 mm
Quarter wavelength:
λ
/4 = (L + H) = 17.61 mm + 6.55 mm = 24.16 mm
The physical size of the antenna is decreased somewhat compared to the theoretical length,
(
λ
= c/4*f = 3x10
8
/ 4x2.45x10
9
) = 30.61 mm