Optimization of time delay laws for focusing with phased arrays

1997 ◽  
Vol 102 (5) ◽  
pp. 3083-3083 ◽  
Author(s):  
Didier Cassereau
Keyword(s):  
Time Delay ◽  
Phased Arrays

scholarly journals Design of True Time Delay Millimeter Wave Beamformers for 5G Multibeam Phased Arrays

Electronics ◽  
2020 ◽  
Vol 9 (8) ◽  
pp. 1331 ◽  
Author(s):  
Dimitrios I. Lialios ◽  
Nikolaos Ntetsikas ◽  
Konstantinos D. Paschaloudis ◽  
Constantinos L. Zekios ◽  
Stavros V. Georgakopoulos ◽  
...  
Keyword(s):  
Time Delay ◽  
Millimeter Wave ◽  
Communication Systems ◽  
Phased Arrays ◽  
High Capacity ◽  
Wireless Systems ◽  
Base Stations ◽  
Small Cells ◽  
True Time Delay ◽  
True Time

Millimeter wave (mm-Wave) technology is likely the key enabler of 5G and early 6G wireless systems. The high throughput, high capacity, and low latency that can be achieved, when mm-Waves are utilized, makes them the most promising backhaul as well as fronthaul solutions for the communication between small cells and base stations or between base stations and the gateway. Depending on the channel properties different communication systems (e.g., beamforming and MIMO) can accordingly offer the best solution. In this work, our goal is to design millimeter wave beamformers for switched beam phased arrays as hybrid beamforming stages. Specifically, three different analog beamforming techniques for the frequency range of 27–33 GHz are presented. First, a novel compact multilayer Blass matrix is proposed. Second, a modified dummy-ports free, highly efficient Rotman lens is introduced. Finally, a three-layer true-time-delay tree topology inspired by microwave photonics is presented.

Implement of Lamb Wave Using PZT Phased Arrays for Structural Health Monitoring

2013 ◽  
Vol 347-350 ◽  
pp. 36-39 ◽  
Author(s):  
Ya Jie Sun ◽  
Yong Hong Zhang ◽  
Cheng Shan Qian
Keyword(s):  
Time Delay ◽  
Structural Health Monitoring ◽  
Health Monitoring ◽  
Lamb Wave ◽  
Phased Array ◽  
Phased Arrays ◽  
Wave Beam ◽  
Beam Steering ◽  
Damage Localization ◽  
Localization Method

Phased array theory is analyzed. The PZT phased array is applied in SHM for the Al plate to identify the hole in the structure. The Lamb wave beam steering is controlled by adding the time delay to the signals. The structure can be scanned in half plane by using the phased array theory to control the Lamb wave beam steering. The damage in the structure can be recognized and localized by the phased array method. The identification result is shown on mapped image. The phased array damage localization method is verified by the experiment and the result shows that the method is effective to recognize the hole damage in the structure.

True Time Delay in Phased Arrays

2016 ◽  
Vol 104 (3) ◽  
pp. 504-518 ◽  
Author(s):  
Ruth Rotman ◽  
Moshe Tur ◽  
Lior Yaron
Keyword(s):  
Time Delay ◽  
Phased Arrays ◽  
True Time Delay ◽  
True Time
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