Range-Angle Dependent Radiation by Using Non-uniform Period Time Modulated Arrays

Kanbaz, Ihsan; Yeşilyurt, Uğur; Aksoy, Ertuğrul

doi:10.1109/mttw53539.2021.9607243

Cited by 2 publications

(1 citation statement)

References 27 publications

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“…On the other hand, time modulation has also been applied to antenna arrays [28], in which a predetermined periodic sequence can achieve side lobe reduction for the fundamental frequency pattern [29]. Moreover, generated harmonic components can be leveraged to provide physical layer security in wireless communication as well as enable radar detection [30][31][32][33][34][35][36][37][38][39][40][41][42]. Nevertheless, for conventional time modulated antenna arrays, pin diodes are usually employed as RF switches that decrease the power efficiency due to power dissipation in their off state [43].…”

Section: Introductionmentioning

confidence: 99%

Programming nonreciprocity and harmonic beam steering via a digitally space-time-coded metamaterial antenna

Vosoughitabar¹,

Wu²

2023

Preprint

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Recent advancement in digital coding metasurfaces incorporating spatial and temporal modulation has enabled simultaneous control of electromagnetic (EM) waves in both space and frequency domains by manipulating incident EM waves in a transmissive or reflective fashion, resulting in time-reversal asymmetry. Here we show in theory and experiment that a digitally space-time-coded metamaterial (MTM) antenna with spatiotemporal modulation at its unit cell level can be regarded as a radiating counterpart of such digital metasurface, which will enable nonreciprocal EM wave transmission and reception via surface-to-leaky-wave transformation and harmonic frequency generation. Operating in the fast wave (radiation) region, the space-time-coded MTM antenna is tailored in a way such that the propagation constant of each programmable unit cell embedded with varactor diodes can toggle between positive and negative phases, which is done through providing digital sequences by using a field-programmable gate array (FPGA). Owing to the time-varying coding sequence, harmonic frequencies are generated with different main beam directions. Furthermore, the space time modulation of the digitally coded MTM antenna allows for nonreciprocal transmission and reception of EM waves by breaking the time-reversal symmetry, which may enable many applications, such as simultaneous transmit and receive, unidirectional transmission, radar sensing, and multiple-input and multiple-output (MIMO) beamformer.

show abstract

Section: Introductionmentioning

confidence: 99%

Programming nonreciprocity and harmonic beam steering via a digitally space-time-coded metamaterial antenna

Vosoughitabar¹,

Wu²

2023

Preprint

View full text Add to dashboard Cite

show abstract

Programming nonreciprocity and harmonic beam steering via a digitally space-time-coded metamaterial antenna

Vosoughitabar

2023

Sci Rep

View full text Add to dashboard Cite

Recent advancement in digital coding metasurfaces incorporating spatial and temporal modulation has enabled simultaneous control of electromagnetic (EM) waves in both space and frequency domains by manipulating incident EM waves in a transmissive or reflective fashion, resulting in time-reversal asymmetry. Here we show in theory and experiment that a digitally space-time-coded metamaterial (MTM) antenna with spatiotemporal modulation at its unit cell level can be regarded as a radiating counterpart of such digital metasurface, which will enable nonreciprocal EM wave transmission and reception via surface-to-leaky-wave transformation and harmonic frequency generation. Operating in the fast wave (radiation) region, the space-time-coded MTM antenna is tailored in a way such that the propagation constant of each programmable unit cell embedded with varactor diodes can toggle between positive and negative phases, which is done through providing digital sequences by using a field-programmable gate array (FPGA). Owing to the time-varying coding sequence, harmonic frequencies are generated with different main beam directions. Furthermore, the space time modulation of the digitally coded MTM antenna allows for nonreciprocal transmission and reception of EM waves by breaking the time-reversal symmetry, which may enable many applications, such as simultaneous transmitting and receiving, unidirectional transmission, radar sensing, and multiple-input and multiple-output (MIMO) beamformer.

show abstract

Range-Angle Dependent Radiation by Using Non-uniform Period Time Modulated Arrays

Cited by 2 publications

References 27 publications

Programming nonreciprocity and harmonic beam steering via a digitally space-time-coded metamaterial antenna

Programming nonreciprocity and harmonic beam steering via a digitally space-time-coded metamaterial antenna

Programming nonreciprocity and harmonic beam steering via a digitally space-time-coded metamaterial antenna

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