A Novel Ultrawideband Planar Inverted-F Antenna with Capacitive Ground Plane

Figure 3

Parametric analyses of the effect of capacitive ground plane on the return loss of the PIFA. (a) Period 𝑎 effect (ℎ=3.5 mm, 𝜀_𝑟=4.4, and 𝑡=2.0 mm), (b) radiating patch height ℎ effect (𝑎=3.0 mm, 𝜀_𝑟=4.4, and 𝑡=2.0 mm), (c) substrate permittivity 𝜀_𝑟 effect (𝑎=3.0 mm, ℎ=3.5 mm, and 𝑡=2.0 mm), and (d) substrate thickness ℎ effect (𝑎=3.0 mm, 𝜀_𝑟=4.4, and ℎ=3.5 mm). The 𝑆₁₁ of the conventional PIFA with a solid ground plane is also given in (a).

(a)

(b)

(c)

(d)