Radiation-Enhancement Properties of an X-Band Woodpile EBG and Its Application to a Planar Antenna

Table 2

Gain enhancement obtained by using a two-dimensional uniform array with 𝑁_𝑎 elements.

𝑁𝑎	Max spacing	Opt spacing	Area (cm^2)	ΔG (dB)
4	6.87𝜆	0.640𝜆	1.86×1.86	8.90
9	3.43𝜆	0.740𝜆	4.31×4.31	13.56
25	1.72𝜆	0.900𝜆	10.5×10.5	19.00
49	1.14𝜆	0.880𝜆	15.4×15.4	22.30
81	0.858𝜆	0.858𝜆	20.0×20.0	23.98