Abstract
Dipole antennas have been well understood in the frequency domain and especially for time-harmonic excitations [1], [2]. However, time-modulated dipoles, with arbitrary modulation functions, have not been extensively studied in the time domain and there is a clear need to investigate this subject more deeply. In this talk, we will present our recent results about temporally modulated dynamic dipole antennas and scatterers. In the context of arbitrary time modulations, we clarify the concept of 'radiation resistance' and develop an analytical model (in the time domain) that describes the interaction of such dipoles with incident electromagnetic waves [3]. The dipoles have electric and magnetic response, and they are loaded with time-varying reactive elements such as inductance and capacitance. Proper choosing of time variations of those elements, we can engineer the radiation (scattering) of the dipoles in the receiving regime. This is due to the new possibilities to manipulate the electric current flowing through the load of the antenna. In the proposed model, the temporal modulation of reactive loads is not restricted by sinusoidal functions and we assume that the modulation can be any arbitrary function provided that the dipoles still remain electrically small in the frequency domain (the dipole approximation). We present a multitude of full-wave simulation results which confirm the validity of the proposed model. Additionally, we elaborate an analogy between the proposed model and the circuit theory, and explain how time varying reactive elements in circuits can bring new functionalities, allowing us to go beyond the theoretical limitations [4]. Finally, we uncover some intriguing applications of time-modulated dipole antennas.
Original language | English |
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Title of host publication | Proceedings of the 2019 21st International Conference on Electromagnetics in Advanced Applications, ICEAA 2019 |
Publisher | IEEE |
ISBN (Electronic) | 9781728105635 |
DOIs | |
Publication status | Published - 1 Sept 2019 |
MoE publication type | A4 Conference publication |
Event | International Conference on Electromagnetics in Advanced Applications - Granada, Spain Duration: 9 Sept 2019 → 13 Sept 2019 Conference number: 21 |
Conference
Conference | International Conference on Electromagnetics in Advanced Applications |
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Abbreviated title | ICEAA |
Country/Territory | Spain |
City | Granada |
Period | 09/09/2019 → 13/09/2019 |