Journal ArticleDOI
A Study on Linear Frequency Modulation Signal Transmission by 4-D Antenna Arrays
TLDR
In this paper, a study on linear frequency modulation (LFM) pulsed signal transmission by four-dimensional (4D) antenna arrays is presented, where the influence brought by the periodic time modulation is analyzed.Abstract:
This paper presents a study on linear frequency modulation (LFM) pulsed signal transmission by four-dimensional (4-D) antenna arrays. LFM pulse is used as the input of 4-D antenna arrays and the influence brought by the periodic time modulation is analyzed. The relationship among pulse duration, chirp rate, sample frequency, time-modulation frequency, and propagation direction is analyzed and the restrictions to these parameters are highlighted. The transmitting and receiving structures are introduced and relevant signal processing steps are described. Numerical examples with several different time schemes, including the pulse shifting (PS) scheme and binary phase center motion (BPCM) scheme, are presented to demonstrate the effectiveness of the LFM signal transmission by 4-D arrays. Simulation results validate that original chirp signal can be correctly recovered and low sidelobe power patterns can be simultaneously achieved by 4-D antenna arrays, as long as the proposed limitations are satisfied.read more
Citations
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Journal ArticleDOI
Time-modulated array antennas – theory, techniques, and applications
TL;DR: An up-to-date overview of the state-of-the-art about time-modulated arrays (TMAs) is presented and the most popular techniques for synthesizing TMAs are revised.
Journal ArticleDOI
LPI Beamforming Based on 4-D Antenna Arrays With Pseudorandom Time Modulation
TL;DR: A novel beamforming approach based on 4-D antenna arrays with pseudorandom time modulation with good agreement with the numerical results is obtained, thus validating the effectiveness of the proposed approach.
Journal ArticleDOI
4-D Retro-Directive Antenna Arrays for Secure Communication Based on Improved Directional Modulation
TL;DR: The numerical and experimental results demonstrate that the proposed transmitter architecture of 4-D retro-directive arrays provides an effective way to achieve wireless secure communication in the scenario with multiple legitimate receivers and under multipath environment.
Journal ArticleDOI
Direction Finding of Linear Frequency Modulation Signal With Time-Modulated Array
Jingfeng Chen,Xianling Liang,Chong He,Anjie Cao,Lin Bai,Weiren Zhu,Junping Geng,Ronghong Jin +7 more
TL;DR: In this article, the authors proposed a method for finding the direction of the linear frequency modulation (LFM) signal, which has a bandwidth that is much larger than that of the modulated frequency, based on the TMA.
References
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Journal ArticleDOI
Ultra-low sidelobes from time-modulated arrays
TL;DR: 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.
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
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.
Journal ArticleDOI
Harmonic Beamforming in Time-Modulated Linear Arrays
TL;DR: The synthesis of simultaneous broadside sum and difference patterns, flat-top and narrow beam patterns, and steered multibeams is enabled as assessed by a set of selected results reported and discussed to show the potentialities of the proposed method.
Journal ArticleDOI
A Two-Element Time-Modulated Array With Direction-Finding Properties
Alan Tennant,Barry Chambers +1 more
TL;DR: In this article, a two-element time-modulated array system which can be configured to provide active electronic null scanning is presented, where the received signal from each element of the array is time switched and combined to provide a phase modulated output in which the depth of modulation is dependent on the angle of arrival of received signal.