Time-modulated dipoles

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

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 languageEnglish
Title of host publicationProceedings of the 2019 21st International Conference on Electromagnetics in Advanced Applications, ICEAA 2019
PublisherIEEE
ISBN (Electronic)9781728105635
DOIs
Publication statusPublished - 1 Sep 2019
MoE publication typeA4 Article in a conference publication
EventInternational Conference on Electromagnetics in Advanced Applications - Granada, Spain
Duration: 9 Sep 201913 Sep 2019
Conference number: 21

Conference

ConferenceInternational Conference on Electromagnetics in Advanced Applications
Abbreviated titleICEAA
CountrySpain
CityGranada
Period09/09/201913/09/2019

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