Design of a broadband quadruple-frequency amplitude-stabilized source module applied to THz imaging system

Abstract

THz imaging technology requires high frequency and stabilized source signal, but direct generation of high frequency and pure signal is difficult, so frequency multiplier technology is important to meet Various requirements. A broadband quadruple-frequency amplitude-stabilized source module is presented in this paper. The quadruple-frequency source module has the characteristics of good amplitude-stability, broad working frequency band, high-purity signal, small size and light weight, etc. Its working band is very broad, output frequency band is 12.8GHz∼18.4GHz. Broadband inter-digital bandpass filters with sharp falling edges are designed to ensure purity of quadruple-frequency signal. Tested results show that fundamental suppression is better than 60dBc and other harmonic suppression is better than 45dBc in whole frequency band. The source module has high stability and anti-interference characteristic, and output power remains constant when input signal power fluctuates. This quadruple-frequency module has been successfully applied to active THz imaging system as a front-stage amplitude-stabilized signal source.