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Table 1 Polynomial roots of the four-order single-passband 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 − 1.5j − 0.9424j − 0.7964 + 1.020j
2 1.5j 0.9424j − 1.2310 + 0.1914j
3 − ∞ − 0.4299j 0.7964 + 1.020j
4 0.4299j 1.2310 + 0.1914j