Extended Composite Right/Left-Handed Transmission Line and Dual-Band Reactance Transformation

Figure 3

Mapping from normalized frequency of a prototype low-pass filter into actual filter frequency. (The solid line, plotted by Ω=𝑤/𝜔^𝑅−𝜔^𝐿/𝑤, is for the dual-band bandpass filter. The circle and dot lines describe the bandstop transformation with minus sign, Ω=−𝜔^𝐿/𝑤, and the bandpass transformation, Ω=𝑤/𝜔^𝑅, resp. Here, 𝑤=𝜔₀(𝜔/𝜔₀−𝜔₀/𝜔).)