Research on Low-Spurious and High-Threshold Limiter

In this paper, a low-spurious and high-threshold limiter is proposed for C-band applications, where power dividers and phase shifters are used to improve the threshold and reduce the spurious response, respectively. Through the principles of multipath synthesis and phase cancellation, the enhancement of fundamental frequency signals and the suppression of harmonic spurs are achieved. The simulated and measured results demonstrate that the presented design can realize a harmonic suppression ratio (HSR) of more than 38.0 dB in the frequency band of 2.6–3.1 GHz. The threshold of the limiter is improved by 3.0 dB, the maximum insertion loss is less than 1.0 dB, and the return loss is more than 13.0 dB.