scholarly journals Tunable Graphene-based Metasurface for Ultra-low Sidelobe Terahertz Phased Array Antenna

2021 ◽  
Author(s):  
Yu Wang ◽  
Yue Wang ◽  
Qingyan Li ◽  
Yu Zhang ◽  
shiyu yan ◽  
...  
Keyword(s):  
Phased Array ◽  
Array Antenna ◽  
Phased Array Antenna ◽  
Low Sidelobe

Technology Research about Beamforming of Multiple-Beam Array Antenna

2014 ◽  
Vol 568-570 ◽  
pp. 1336-1339
Author(s):  
Gao Feng Pan ◽  
Sheng Liang ◽  
Hao Xue ◽  
Guang Ming Xu ◽  
Xing Yuan Xu
Keyword(s):  
Theoretical Basis ◽  
Phased Array ◽  
Array Antenna ◽  
Engineering Practice ◽  
Technology Research ◽  
Phased Array Antenna ◽  
Key Technology ◽  
Beam Array ◽  
Low Sidelobe ◽  
Beamforming Algorithm

Active phased array antenna (APAA) can realize multi-object tracking and the beamforming is the key technology. Multi-area array and the implement method of its beamforming are introduced in this paper. Coordinated transformation formula is offered based on engineering practice and beams are synthesized by beamforming algorithm of low sidelobe. Following simulation shows results about beam coverage, those provide theoretical basis for the further research.

scholarly journals Shape and Weighting Optimization of a Subarray for an mm-Wave Phased Array Antenna

2021 ◽  
Vol 11 (15) ◽  
pp. 6803
Author(s):  
Taeyong Jeong ◽  
Juho Yun ◽  
Kyunghyun Oh ◽  
Jihyung Kim ◽  
Dae Woong Woo ◽  
...  
Keyword(s):  
Objective Function ◽  
Phased Array ◽  
Quadratic Function ◽  
Array Antenna ◽  
Phased Array Antenna ◽  
Array Pattern ◽  
Full Wave ◽  
Array Antennas ◽  
Low Sidelobe ◽  
Half Power

This paper discusses how to optimize the weighting of individual subarrays to derive the low sidelobe level (SLL) based on quadratic programming (QP) and how to derive QP parameters to ensure that the objective function is composed of the quadratic function form, with the actual number identical to the standard objective function of QP. Next, in order to analyze the SLL, a 24 × 24 phased array antenna was compared with 96 transmit–receive modules (TRMs) attached only to the subarray stage and a phased array antenna with 576 TRMs attached to all radiating elements without a subarray. Optimized weighting was applied to the array antennas with a subarray, and Taylor weighting was applied to the array antennas without a subarray. The number of TRMs used in the phased array antenna with the optimized weighting was reduced by 83.3% compared to the phased array antenna in which TRMs were attached to all radiating elements. The SLL and the half-power beamwidths (HPBWs) of the two antennas were practically identical in a narrow beam-scanning environment. Finally, an array pattern (AP) in which mutual coupling between the radiating elements was considered was calculated to verify the optimized weighting. Moreover, the optimized weighting was applied to CST Microwave Studio (an EM full-wave simulation) to compare the results from the AP calculation and a simulation. It was confirmed that the two results above are largely indistinguishable. The analysis found that the HPBW is 3.6∘× 3.6∘ and the SLL is −26.18 dB from AP calculations in the boresight direction. When each 5∘ beam was scanned at the azimuth and elevation, the corresponding HPBW values were 3.7∘× 3.7∘ and 3.7∘× 3.7∘ and the SLLs were −22.70 dB and −24.44 dB according to the AP calculations.

scholarly journals Technique for spatial interference reduction and its application in monopulse radar with active phased array antenna

2021 ◽  
pp. 17-22
Author(s):  
E. S. Parshina
Keyword(s):  
Phased Array ◽  
Pattern Generation ◽  
Array Antenna ◽  
Phased Array Antenna ◽  
Pattern Synthesis ◽  
Interference Reduction ◽  
Low Sidelobe ◽  
Spatial Interference ◽  
Aperture Distribution ◽  
Difference Pattern

The paper describes monopulse radar with sidelobe-blanking system. The antenna of the sidelobe-blanking system is one subarray of the radar’s active phased array antenna. The elements of the subarray is also used for sum and difference pattern generation. It is shown that if aperture distribution required to produce low-sidelobe sum pattern is used, the pattern of one subarray will satisfy the requrements for antenna of the sidelobe-blanking system. An example of designing the monopulse radar with sidelobe-blanking system is presented. Sum pattern of the radar anettena is produced with different low-sidelobe pattern synthesis procedures. The analysis of monopulse radar parameters and sidelobe-blanking system performance is done.

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