Table 1 x n is the short axis radius of the nth oval-ring, y n is the long axis radius of the nth oval-ring, p n is the distance between the nth and the n + 1th oval-ring centers.

From: Spoof Surface Plasmon Polaritons Power Divider with large Isolation

Rn

R1

R2

R3

R4

R5

R6

R7

R8

R9

R10

x n

0.7

0.75

0.8

0.85

0.9

0.95

1

1.05

1.1

1.1592

y n

1.15

1.555

1.96

2.365

2.77

3.175

3.58

3.985

4.39

4.795

P n

1.4

1.28

1.38

1.5

1.6

1.75

1.85

1.95

2.05

2.0184