# First SIMO Harmonic Radar Based on the SFCW Concept and the HR Transfer Function
## 7 Conclusions  
A new SIMO radar based upon the harmonic radar (HR) principle and stepped continuous wave frequency method was presented in this paper. The SIMO HR system operates in the 2.45 GHz ISM band for transmitting the scene illumination signal and receives the return signal at twice the bandwidth at a frequency band centered around 4.9 GHz. A novel harmonic transponder matrix, in which the individual tags forming individual propagation path cells can be activated and disabled via a DC voltage using a bias controller, was also developed and presented for the first time. The theoretical basis of this special system was presented in more detail and first measurements were shown. Other researchers in the field of signal evaluation will be provided with further detailed measurement series for evaluation based on traditional radar imaging techniques as well as machine learning approaches for object classification and feature extraction. For this purpose, the necessary information on the HR and the SIMO measurement setup was published in detail in this paper. In addition, it was explained why this new SIMO HR is a very interesting solution compared to the existing systems for RF measurements in production technology and other monitoring applications. In addition, the novel HR transfer function, which is a basis for the material analysis or imaging generation, was presented and metrologically verified in an easily traceable coaxial setup. **Author Contributions:** Conceptualization, methodology, formal analysis, investigation, writing--original draft preparation: all authors. Validation, software: TH. and T.C. Supervision, project administration, internal funding acquisition, writing--review and editing: H.H. All authors have read and agreed to the published version of the manuscript. **Funding:** His research received no external funding. **Institutional Review Board Statement:** Not applicable. **Informed Consent Statement:** Not applicable. \begin{table}
\begin{tabular}{c c c c c c c c c} \hline \hline  & \(\overline{P_{\text{Meas}}^{II}}\) & \(\Delta\overline{P^{II}}\) & \(\overline{P_{\text{Meas}}^{II}}\) & \(\Delta\overline{P^{II}}\) & \(\overline{P_{\text{Meas}}^{II}}\) & \(\Delta\overline{P^{II}}\) & \(\overline{P_{\text{Meas}}^{II}}\) & \(\Delta\overline{P^{II}}\) \\  & \(\mathbf{\#1}\) & \(\mathbf{\#1}\) & \(\mathbf{\#2}\) & \(\mathbf{\#2}\) & \(\mathbf{\#3}\) & \(\mathbf{\#3}\) & \(\mathbf{\#4}\) & \(\mathbf{\#4}\) \\  & \(\mathbf{\text{in dBm}}\) & \(\mathbf{\text{in dB}}\) & \(\mathbf{\text{in dBm}}\) & \(\mathbf{\text{in dB}}\) & \(\mathbf{\text{in dBm}}\) & \(\mathbf{\text{in dB}}\) & \(\mathbf{\text{in dBm}}\) & \(\mathbf{\text{in dB}}\) \\ \hline Ref. Meas. & \(-87.32\) & N/A & \(-87.38\) & N/A & \(-87.35\) & N/A & \(-87.39\) & N/A \\ \hline
3 dB Att. (A) & \(-96.85\) & \(-9.53\) & \(-96.42\) & \(-9.04\) & \(-96.43\) & \(-9.08\) & \(-96.42\) & \(-9.03\) \\ \hline
6 dB Att. (B) & \(-104.17\) & \(-16.85\) & \(-104.17\) & \(-16.79\) & \(-104.20\) & \(-16.85\) & \(-104.17\) & \(-16.78\) \\ \hline
10 dB Att. (C) & \(-116.95\) & \(-29.32\) & \(-116.93\) & \(-29.55\) & \(-116.89\) & \(-29.54\) & \(-116.96\) & \(-29.57\) \\ \hline
20 dB Att. (D) & \(-147.61\) & \(-60.29\) & \(-147.37\) & \(-59.99\) & \(-147.55\) & \(-60.20\) & \(-147.69\) & \(-60.3\) \\ \hline \hline \end{tabular}
\end{table} 
Table 1: Measured mean harmonic power \(\overline{P_{\text{Meas}}^{II}}\) in the harmonic frequency band H2 = \(5800\ldots 5880\) MHz for four different devices-under-test obtained in four different measurement runs using the experimental setup shown in Figures 16 and 17. Data Availability Statement:[[https://www.researchgate.net/project/Mixed-frequency-S-parameter-measurements](https://www.researchgate.net/project/Mixed-frequency-S-parameter-measurements)]([https://www.researchgate.net/project/Mixed-frequency-S-parameter-measurements](https://www.researchgate.net/project/Mixed-frequency-S-parameter-measurements)) from August 2022.