A Novel Design of Frequency Multiplier Using Feedforward Technique and Defected Ground Structure

A novel design of frequency multiplier using a feedforward technique and a defected ground structure (DGS) is proposed. The feedforward loop in the proposed frequency multiplier suppresses the fundamental component (f₀) the dumb-bell or spiral shaped DGS diminish unwanted harmonics such as second, third, fourth. Due to the combination of the feedforward structure and the DGS, only the multiplied frequency component (2f₀, 3f₀, 4f₀ ) appears at the output port and the other unwanted components are suppressed excellently. The frequency multipliers are designed at 1 GHz of f₀, by the proposed technique and measured. The measured output power of2f₀, 3f₀, 4f₀ is -2.59 dBm, -5.36 dBm, -4.57 dBm, respectively, when the input power is 0 dBm