Monolithically Integrated Time-Varying Transmission Line (TVTL) for RF Signal Processing

Speaker: Qianteng Wu
Affiliation: Ph.D. Candidate


In-Band jammer/interference that cannot be isolated by filter in today’s RF system could easily desensitize and saturate RF front-end. Performing RF signal processing like correlation directly at the RF front-end could reduce the in-band jammer/interference prior to the receiver to prevent the jamming, which enables the RF system has the ability to operate in the unpredicted and high interference environments and increases the dynamic range of the receiver. However, the implementation of the direct correlation is usually challenging due to the insertion loss of the mixer which could significant degrade sensitivity and signal to noise ratio of the system. Time-varying transmission line (TVTL), a novel RF circuit, which has capacitance periodically loaded on a transmission line and modulated by a carrier, provides unique property of low noise, low loss frequency conversion. Meanwhile, this circuit can be integrated in the modern  Monolithic Microwave Integrated Circuit  (MMIC). New time-varying transmission lines are designed and fabricated on MMIC and two types of correlators, open loop correlator and closed loop correlator, based on the time-varying transmission line are studied, implemented and verified. Both frequency and time domain correlation are tested and results demonstrate low noise, low loss, broadband and high power handling performance of the designed chip- scale RF correlator.


Qianteng Wu received his B.S. degree in Communication Engineering from Hangzhou Dianzi University, Hangzhou, China, in 2013 and the M.S. degree in Electrical Engineering from UC Davis, Davis, CA, USA, in 2015. He is currently pursuing the Ph.D. degree in Electrical and Computer Engineering as a Graduate Student Researcher at UCLA. His research interests include time-varying transmission line.

For more information, contact Prof. Yuanxun (Ethan) Wang ()

Date(s) - Nov 13, 2019
10:00 am - 12:00 pm

E-IV Maxwell Room #57-124
420 Westwood Plaza - 5th Flr. , Los Angeles CA 90095