Journal ArticleDOI
Ultra-low sidelobes from time-modulated arrays
TLDR
In this paper, the authors presented an antenna pattern with ultra-low sidelobes for an experimental receiving array designed with time-modulated slot radiators using on-off RF switches which are programmed in a predetermined sequence to produce the desired pattern.Abstract:
Antenna patterns with ultra-low sidelobes have been obtained for an experimental receiving array designed with time-modulated slot radiators. The technique utilizes on-off RF switches which are programmed in a predetermined sequence to produce the desired pattern. The results of tests on an experimental eight-element slot array designed for sidelobe reduction are presented. Two examples are considered: 1) an initial static pattern with 30-db sidelobes which are reduced to about 40 db by sequential switching and 2) an initial static pattern with 13-db sidelobes which are reduced directly to about 40 db by a different sequence of switching. Measured patterns illustrating the sidelobe reduction are included. The applicability of the sidelobe reduction technique to large electronically steerable phased arrays is considered briefly and it is concluded that it is compatible with such systems.read more
Citations
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Journal ArticleDOI
Space-time-coding digital metasurfaces
Lei Zhang,Xiao Qing Chen,Shuo Liu,Qian Zhang,Jie Zhao,Jun Yan Dai,Guo Dong Bai,Xiang Wan,Qiang Cheng,Giuseppe Castaldi,Vincenzo Galdi,Tie Jun Cui +11 more
TL;DR: A general theory of space-time modulated digital coding metasurfaces is proposed to obtain simultaneous manipulations of EM waves in both space and frequency domains, i.e., to control the propagation direction and harmonic power distribution simultaneously.
Journal ArticleDOI
Directional Modulation Technique for Phased Arrays
TL;DR: In this article, a directional modulation (DM) technique using a phased array to produce the modulation is presented, where the desired amplitude and phase of each symbol in a digital modulation scheme can be produced in a given direction with data rates determined by the switching speed of the phase shifters.
Journal ArticleDOI
Sideband suppression in time-modulated linear arrays by the differential evolution algorithm
TL;DR: In this article, a differential evolution (DE) based approach is proposed to suppress the sideband radiation patterns in time modulated linear antenna arrays by rearranging the static excitation amplitudes and switch-on time intervals of each element.
Journal ArticleDOI
Unconventional Phased Array Architectures and Design Methodologies—A Review
TL;DR: This paper reviews and highlights some of the most recent advances in this field, including clustered, thinned, sparse, and time-modulated arrays, and their proposed design methodologies.
Proceedings ArticleDOI
Frequency Diverse Array Antenna with Periodic Time Modulated Pattern in Range and Angle
TL;DR: In this article, a general analysis of a frequency diverse transmit array antenna with a periodic modulated pattern in range, angle and time is presented, which makes a continuous scanning in range and angle without using any phase shifters.
References
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Journal ArticleDOI
Four-dimensional electromagnetic radiators
H. E. Shanks,R. W. Bickmore +1 more
TL;DR: In this article, the authors describe an entirely new and fundamental technique which has wide application to many fields of the antenna art as well as important system implications, and the essence of this philosophy is described.