scholarly journals USE OF AN ACTIVE PHASED ARRAY ANTENNA IN RADAR’S SIDE LOBES CANCELLATION SYSTEM

2019 ◽  
pp. 19-23
Author(s):  
E. S. Parshina ◽  
K. Yu. Cheredeev
Keyword(s):  
Iterative Method ◽  
Phased Array ◽  
Side Lobe ◽  
Array Antenna ◽  
Antenna Synthesis ◽  
Phased Array Antenna ◽  
Array Pattern ◽  
Channel Interference ◽  
Radar Antenna ◽  
Impulse Interference

The paper describes an example of designing the radar’s side lobes cancellation system. It is based on the scheme of one channel interference canceler. The analysis of the antennas, which are ussually used in radar’s side lobes cancellation systems, is done, and active phased array antenna is chosen as an antenna of the radar’s side lobes cancellation system. The array pattern was formed by using antenna synthesis iterative method in order to fulfill the radar’s side lobes cancellation system’s antenna requirements. The antenna modeling results and its’ analysis are presented. The radar’s side lobes cancellation system with active phased array antenna eliminates intentional noise or impulse interference from any side lobe directions of the radar antenna.

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.

Analysis of Phased Array Antenna’s Vibration Effects on the Performance of Shipborne MLS

2014 ◽  
Vol 687-691 ◽  
pp. 1080-1086
Author(s):  
Hong Sen Xie ◽  
Peng Zhou ◽  
Jun Gan Wei ◽  
Ding Wang
Keyword(s):  
Random Vibration ◽  
Phased Array ◽  
Array Antenna ◽  
Phased Array Antenna ◽  
Array Pattern ◽  
Calibration Algorithm ◽  
Navigation Error ◽  
Error Calibration ◽  
Flight Deck ◽  
Vibration Error

In order to provide precise guidance for the landing of carrier-based aircrafts, the phased array antenna and the principle of time reference scanning beam are used in the shipborne MLS. The phased array antenna is installed under the flight deck of the ship stern, so the vibration could change the relative position of antenna elements, which will cause the navigation error. In this paper, through the establishment of antenna array pattern and phased array antenna vibration error model, an error calibration algorithm is proposed after the simulation of phased array antenna’s random vibration effects on the guiding performance of shipborne MLS in three axes. Computer simulations show that the calibration algorithm could improve the guiding performance of shipborne MLS.

scholarly journals A 28 GHz 5G Phased Array Antenna with Air-Hole Slots for Beam Width Enhancement

2019 ◽  
Vol 9 (20) ◽  
pp. 4204 ◽  
Author(s):  
Hojoo Lee ◽  
Sungpeel Kim ◽  
Jaehoon Choi
Keyword(s):  
Phased Array ◽  
Cost Effective ◽  
Beam Width ◽  
Side Lobe ◽  
Array Antenna ◽  
Side Lobe Level ◽  
Phased Array Antenna ◽  
Half Power ◽  
Mobile Handset ◽  
Air Hole

In this paper, a 28 GHz fifth-generation (5G) phased array antenna with air-hole slots for beam width enhancement is proposed. The proposed antenna consists of eight dipole radiators on a mobile handset-sized ground with air-hole slots between the two adjacent elements for enhancing the half power beam width (HPBW) in the elevation plane. The dimensions of the proposed antenna are 130 mm × 42 mm × 0.127 mm. The proposed array antenna satisfies a −10 dB reflection coefficient in the frequency range from 27.2 to 29.2 GHz with a peak gain of 10.33 dBi and a side lobe level (SLL) of 13 dB. In addition to its good performance, the proposed antenna has a very wide HPBW (measured) in the elevation plane, up to 219 degree with a scan coverage of ±45 degree in the azimuth plane. The proposed antenna demonstrates excellent hemispheric beam coverage for 5G mobile handset devices and can enable cost-effective mass production.

Design of Active Phased Array Antenna in Wind Profiling Radar

2011 ◽  
Vol 418-420 ◽  
pp. 2161-2165
Author(s):  
Ming Bao Hu ◽  
Guo Guang Zheng ◽  
Hong Bing He
Keyword(s):  
Phased Array ◽  
High Efficiency ◽  
Transmission Loss ◽  
Side Lobe ◽  
High Ratio ◽  
Array Antenna ◽  
Phased Array Antenna ◽  
Power Dividers ◽  
Half Wave ◽  
Radiation Unit

The active phased array antenna is a direction of modern radar development. But it is expensive. So the key in meteorological radar design is to get high ratio of capability and cost. We used 400 cross-polarization half wave diploes as radiation unit to get a high efficiency and reliability antenna, it also has low side lobe by Taylor weighting. 20 transmit/receive(T/R) modules produced too little heat to disperse, so it can be cooled by nature wind. 40 power dividers which one is divided into twenty parts and 1 power combiner decreased transmission loss. This antenna is fit for the need of wind profiling radar.

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