High Gain Compact Strip and Slot UWB Sinuous Antennas

Table 1

Material parameters.

Shell	0 (inner)	1	2	3	4	5	6	7 (outer)
𝜀𝑟	1	1	1.3	2.3	3.8	6.5	10.9	18.36
tanδ	0.5	0.5	0.5	0.5	0.5	0.5	0.5	0.5