K- and W-Band Free-Space Characterizations of Highly Conductive Radar Absorbing Materials
| Autor: | Nagma Vohra, Magda El-Shenawee |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Permittivity
Materials science business.industry 020208 electrical & electronic engineering 02 engineering and technology Network analyzer (electrical) Optics W band Transmission line Electromagnetic shielding 0202 electrical engineering electronic engineering information engineering Return loss Scattering parameters Electrical and Electronic Engineering business Instrumentation Beam (structure) |
| Zdroj: | IEEE Transactions on Instrumentation and Measurement. 70:1-10 |
| ISSN: | 1557-9662 0018-9456 |
| Popis: | This work presents a characterization technique of highly conductive material in the K- and $W$ -bands. The transmission line theory model is modified to adapt to the phase challenges observed in the measured S-parameters at high frequency. The S-parameters measurements are obtained using the nondestructive focused beam free-space system connected with the network analyzer and the millimeter-wave frequency extenders. The system provides measurements in a frequency range from 5.8 to 110 GHz, and it includes focused beam horn lens antennas to minimize sample edge reflection. The thru-reflect-line (TRL) calibration and the time-gated feature of the network analyzer are used. Good agreement between the measured and calculated S-parameters in the transmission mode is achieved using the extraction algorithm. The measured S-parameters are further used to obtain the electromagnetic shield effectiveness parameters and the percentage of power absorbed in the material. In addition, the return loss of the metal-backed material is calculated using the extracted permittivity to obtain the maximum absorption at the desired frequencies. |
| Databáze: | OpenAIRE |
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