A third-order harmonic radar design for mm-wave frequencies

Ashish Mishra, Changzhi Li

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

3 Scopus citations


The nonlinear properties of electronic devices, such as diodes and transistors, can generate nonlinear responses such as harmonic and intermodulation for clutter rejection purposes. The naturally occurring clutter objects are generally linear, or they possess very small nonlinearity. They can be distinguished from man-made targets containing the above-mentioned nonlinear devices by exploiting nonlinear responses. In this paper, this nonlinear property was utilized for generating a 3 rd -order harmonic response for clutter rejection purposes. Existing nonlinear radars generally exploit 2 nd -order harmonic responses for clutter rejection purposes owing to their high power levels among the harmonic responses. However, due to their proximity to the fundamental tone, these radars require bulky and expensive filters and diplexers with steep roll-off for maintaining the linearity of the transmitter and receiver section of the radar. As the 3rd -order harmonic response and the fundamental tone are widely separated in the frequency spectrum compared to the 2nd order harmonic response, better isolation between the fundamental and harmonic response can be achieved. This results in relaxed requirements for filters and diplexers for these 3rd order based harmonic radars. Apart from that, the receiver and tag size would be reduced since size and frequency are inversely proportional. In this paper, the 3 rd -order harmonic radar and a passive tag were designed and operated in millimeterwave frequency bands, i.e., 24/72 GHz. Experimental validations were performed to prove their clutter rejection ability.

Original languageEnglish
Title of host publicationRadar Sensor Technology XXV
EditorsKenneth I. Ranney, Ann M. Raynal
ISBN (Electronic)9781510643215
StatePublished - 2021
EventRadar Sensor Technology XXV 2021 - Virtual, Online, United States
Duration: Apr 12 2021Apr 16 2021

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X


ConferenceRadar Sensor Technology XXV 2021
Country/TerritoryUnited States
CityVirtual, Online


  • Doppler
  • clutter rejection
  • harmonic
  • mm-Wave
  • third-order


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