Two-region model for harmonic radar transponders

A. Lavrenko; J. Cavers

Two-region model for harmonic radar transponders

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Author(s): A. Lavrenko¹ and J. Cavers²
- Affiliations: 1: Scion , NZ Forest Research Institute , Christchurch , New Zealand ;
  2: Wireless Research Centre , University of Canterbury , Christchurch , New Zealand
Source: Volume 56, Issue 16, 06 August 2020, p. 835 – 838
DOI: 10.1049/el.2020.0779 , Print ISSN 0013-5194, Online ISSN 1350-911X

Received 02/04/2020, Published 02/06/2020

Harmonic radar transponders are passive RF tags that produce a harmonic response when illuminated with an RF signal. With a Schottky diode as the main component, the tag current is usually modelled as an exponential function of antenna voltage, resulting in an approximate polynomial function for small signals. The authors introduce the Lambert function that accounts for the resistive load and leads to a two-region tag model: a power series representation for small signals and an asymptotic linear large-signal model. Furthermore, they provide the relationship between the modulated bandpass signals at the input and output of the tag in the two regions by expressing the tag signals with complex envelopes. The derived expressions offer deeper insight of the transponder's impact on the operation of harmonic radar systems.

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Two-region model for harmonic radar transponders

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