Influence Analysis of Transmission Lines on a Stable Non-Foster-Loaded Electrically Small Dipole
| Autor: | Hu Yang, Taolin Liu, Zhixun Huang |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Physics
Article Subject 020208 electrical & electronic engineering Bandwidth (signal processing) 020206 networking & telecommunications 02 engineering and technology lcsh:HE9713-9715 law.invention Capacitor Dipole Electric power transmission law Control theory 0202 electrical engineering electronic engineering information engineering lcsh:Cellular telephone services industry. Wireless telephone industry lcsh:Electrical engineering. Electronics. Nuclear engineering Electrical and Electronic Engineering Reflection coefficient Electrical impedance lcsh:TK1-9971 Microwave Electronic circuit |
| Zdroj: | International Journal of Antennas and Propagation, Vol 2019 (2019) |
| ISSN: | 1687-5877 1687-5869 |
| Popis: | Non-Foster-loaded antennas have the advantages of compact size and large bandwidth. Meanwhile, they suffer from two issues: internal instability and simulation inaccuracy resulting from distribution parameters. The most commonly used stability analysis method for microwave circuits, Rollett’s criteria, is not suitable for negative impedance circuits. This paper has explained the reason and proposed an effective method for stability analysis. Transmission lines between lumped components are found to be a main reason of inaccurate simulations, which is analyzed in this paper, and it is concluded that their influence also exists at hundreds of megahertz. In order to solve this problem and improve simulation accuracy, circuit and electromagnetic cosimulation is conducted. Finally, a 320 mm dipole loading with a negative capacitor is fabricated to verify the analysis. Simulated and measured results indicate that the proposed stability analysis is effective and the simulation accuracy is significantly improved. The matched dipole achieves less than −10 dB reflection coefficient from 30 MHz to 580 MHz. Furthermore, a 14 dB gain improvement is obtained in electrically small condition. |
| Databáze: | OpenAIRE |
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