A Self-Packaging Comb Spectrum Generator Based on Substrate Integrated Suspension Line

A comb spectrum generator based on the substrate integrated suspension line (SISL) is presented. The circuit is placed in an air cavity formed by the stacking of multilayer substrates. The spectrum generator has good structural stability, self-packaging, high electromagnetic shielding, and a small foot?print. Moreover, it can achieve high efficiency and rich harmonic signals output from the L- to K-band. The measured results demonstrate that the power of the 18th harmonic signal of the comb spectrum generator is higher than ?32 dBm under the input fundamental frequency range from 500 MHz to 1 GHz at 2 dBm.