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Table 2 Polynomial roots of the eight-order dual-band filter

From: Design of Micro-strip Symmetrical Dual-band Filter Based on Wireless Sensor Network Nodes

Functions

Transmission zeros, the roots of P(Ω′)

Reflection zeros, the roots of F(Ω′)

Transmitting or reflecting singularities, the roots of E(Ω′)

1

1.175j

0.5097j

− 0.0656 + 1.066j

2

0.4254j

− 0.9809j

− 0.0656 − 1.066j

3

− 0.4254j

0.9809j

− 0.1711 + 0.5115j

4

− 1.175j

− 0.5097j

− 0.2941 + 0.8791j

5

0

0.6078j

− 0.2941 − 0.8791j

6

0

− 0.6078j

− 0.0287 − 0.4673j

7

–

− 0.8227j

− 0.1711 − 0.5115j

8

–

0.8227j

− 0.0287 + 0.4673j