| Autor: |
Mostafa Bakry, Ludger Klinkenbusch |
| Rok vydání: |
2019 |
| Předmět: |
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| Zdroj: |
Advances in Radio Science, Vol 17, Pp 65-70 (2019) |
| ISSN: |
1684-9973 |
| Popis: |
The internally stored electric energy (Q-energy) of a disk monopole antenna increases as compared to a monopole antenna without a top disk. Recently it was shown that the Q-energy can be significantly reduced and the bandwidth increased by shielding the disk monopole antenna using a thin magnetic material. In the present paper we consider the same structure to explain another method to increase the bandwidth by using a shield made of dispersive magnetic material. We apply the Kramers-Kronig transforms to derive physically correct real and imaginary parts of the dispersive magnetic material. We do not aim at a reduction of the internal energy but at a compensation of the electric by a magnetic stored energy for a wide frequency range. Disk monopole antennas with shells consisting of such dispersive permeability are finally numerically evaluated by means of a commercial frequency-domain field simulator. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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