Antenna bandwidth engineering through time-varying resistance
The operational bandwidth of resonant circuits is limited by the resonator's size, which is known as the Chu limit. This limit restricts miniaturization of antennas, as the antenna bandwidth is inversely proportional to its size. Here, we propose slow time modulation of resistive elements to en...
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| Veröffentlicht in: | Applied physics letters 2023-04, Vol.122 (17) |
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| container_title | Applied physics letters |
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| creator | Mostafa, M. H. Ha-Van, N. Jayathurathnage, P. Wang, X. Ptitcyn, G. Tretyakov, S. A. |
| description | The operational bandwidth of resonant circuits is limited by the resonator's size, which is known as the Chu limit. This limit restricts miniaturization of antennas, as the antenna bandwidth is inversely proportional to its size. Here, we propose slow time modulation of resistive elements to engineer bandwidth of small antennas. The temporal modulation of resistance induces virtual impedance that is fully controlled by the modulation parameters. We show how the virtual impedance can be used to optimize the frequency response of a resonant circuit, leading to enhanced matching at multiple frequencies simultaneously. We experimentally verify the proposed technique, demonstrating enhancement of radiation of a broadband modulated signal radiated by a small antenna. |
| doi_str_mv | 10.1063/5.0133016 |
| format | Article |
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| ispartof | Applied physics letters, 2023-04, Vol.122 (17) |
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| language | eng |
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| source | AIP Journals Complete; Alma/SFX Local Collection |
| subjects | Antennas Applied physics Bandwidths Broadband Circuits Frequency response Impedance Modulation |
| title | Antenna bandwidth engineering through time-varying resistance |
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