Optimization of Radiating Fields and the Example of Null-Placement

Pattern synthesis of Antenna array has gained much attention over the last years as they constitute an important role in the modern communication systems. Unit circle-based techniques such as Schelkunoff null placement method have proved their effectiveness to synthesize uniformly spaced linear arrays. Nonuniformly spaced antenna array pattern synthesis has been investigated and interesting results have been obtained. In this work, the unit circle representation approach is applied to synthesize nonuniformly spaced and nonuniformly excited linear arrays. The objective is to accurately place nulls in the desired directions while achieving the least possible sidelobe level. The problem is cast as an optimization problem that is solved using the Teaching Learning Based Optimization (TLBO). Examples are dealt with to prove the design approach effectiveness and flexibility for modern communication system applications.

Download Full-text

NULL PLACEMENT AND SIDELOBE SUPPRESSION IN FAILED ARRAY USING SYMMETRICAL ELEMENT FAILURE TECHNIQUE AND HYBRID HEURISTIC COMPUTATION

Progress In Electromagnetics Research B ◽

10.2528/pierb13032712 ◽

2013 ◽

Vol 52 ◽

pp. 165-184 ◽

Cited By ~ 17

Author(s):

Shafqat Ullah Khan ◽

Ijaz Mansoor Qureshi ◽

Fawad Zaman ◽

Aqdas Naveed

Keyword(s):

Sidelobe Suppression ◽

Hybrid Heuristic ◽

Element Failure ◽

Null Placement

Download Full-text

Antenna Design Optimization With Desired Null Placement Using Particle Swarm Optimization Algorithm

2018 International Conference on Advances in Computing, Communication Control and Networking (ICACCCN) ◽

10.1109/icacccn.2018.8748802 ◽

2018 ◽

Author(s):

Anuj Mathur ◽

T.A. Ajith ◽

Sanjeev Saxena

Keyword(s):

Particle Swarm Optimization ◽

Design Optimization ◽

Optimization Algorithm ◽

Particle Swarm Optimization Algorithm ◽

Particle Swarm ◽

Antenna Design ◽

Swarm Optimization ◽

Null Placement

Download Full-text

Cognitive null steering in frequency diverse array radars

International Journal of Microwave and Wireless Technologies ◽

10.1017/s1759078715001221 ◽

2015 ◽

Vol 9 (1) ◽

pp. 25-33 ◽

Cited By ~ 4

Author(s):

Sarah Saeed ◽

Ijaz Mansoor Qureshi ◽

Abdul Basit ◽

Ayesha Salman ◽

Waseem Khan

Keyword(s):

Feedback Loop ◽

Super Resolution ◽

Computation Time ◽

Frequency Offset ◽

Multiple Signal Classification ◽

Location Parameters ◽

Null Steering ◽

Frequency Diverse Array ◽

Null Placement ◽

Parametric Approximation

Null steering has been a challenge in radar communications for the past few decades. In this paper, a novel cognitive null steering technique in frequency diverse array radars using frequency offset selection is presented. The proposed system is a complete implementable framework that provides precise and deep null placement in the range and angle locations of the interference source. The proposed system is cognitive such that the transmitter and receiver are connected via a feedback loop. System extracts interference source location parameters from the radar scene using Multiple Signal Classification, a super resolution direction of arrival estimation technique. Neural networks known for minimum computation time, and good non-linear and non-parametric approximation have been utilized for prediction of next location of the interference source. Simulation results validate the proposed frequency offset selection by demonstrating precise and deep nulls at the desired locations.

Download Full-text