| Autor: |
McCann, John F., Aberle, James T., Lai, Ying-Cheng |
| Zdroj: |
2013 IEEE MTT-S International Microwave Symposium Digest (MTT); 2013, p1-4, 4p |
| Abstrakt: |
Non-Foster networks have the potential to provide wideband matching to electrically-small antennas. Impedance data from a model of an electrically-small monopole provides the starting point of this work. A lumped-element model of the monopole is developed, and used to design a matching network using a shunt negative capacitor and L-section subnetwork. The resulting network provides a larger bandwidth than that with passive matching. Stability of the network is analyzed under the assumption of ideal negative capacitor, and it is demonstrated that a change in an antenna impedance can induce instability. Transient analysis using Agilent ADS software, calculations based on differential equations using MATLAB, and s-domain analysis are all employed. The network is similarly analyzed when the negative capacitor is replaced by an equivalent J-transform circuit section, allowing for the inclusion of a nonlinear negative resistance. Nonlinear differential equations are developed for general stability analysis of non-Foster networks. [ABSTRACT FROM PUBLISHER] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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