Radar Cross section Vs Reflection Coefficient

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Discussion Overview

The discussion centers around the relationship between the S11 parameter and radar cross-section (RCS) in the context of antenna design using HFSS. Participants explore the implications of modifying the S11 parameter on RCS and the rationale for calculating S11 for a unit cell before creating an array.

Discussion Character

  • Technical explanation, Conceptual clarification, Debate/contested

Main Points Raised

  • One participant questions the relationship between S11 and RCS, seeking to understand why S11 is calculated for the unit cell and whether modifying it would improve RCS.
  • Another participant inquires about the context of the question, specifically whether it pertains to schoolwork or professional projects.
  • A further response asks for additional details about the project, including the type of antenna and the frequency range of the HFSS signal, indicating a need for more context to provide relevant insights.

Areas of Agreement / Disagreement

The discussion does not present a consensus, as participants are exploring different aspects of the relationship between S11 and RCS without reaching a definitive conclusion.

Contextual Notes

Participants have not yet addressed specific assumptions or dependencies related to the definitions of S11 and RCS, nor have they resolved the implications of modifying S11 on RCS.

jackRF
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I am working on HFSS and designing Antennas for LOW RCS , in all previous works they calculate the S11 parameter for the unit cell then make an array form this unit cell and calculate the RCS , my question is what is the relation between S11 and RCS and why we calculate S11 for the unit cell only and if i modify the unit cell's S11 it will improve the RCS or not
 
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Welcome to the PF. :smile:

Is this question for schoolwork or for regular work?
 
regular work
 
Thanks. I'll move it to the EE forum. Can you say more about the project? Why are you concerned about the radar cross-section of the antenna? What type of antenna is it, and what is the frequency range of the HFSS signal?
 

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