according to high costs of phase shifters in antenna arrays, new methods for beam steering without phase shifter were introduced. frequency diverse array (fda) concept is another approach to beam steering problem. in this structure, the subsequent antenna elements are fed with stepped discrete frequencies causing continuous scanning of space in time. so a range-angle dependent scanning is made ...

Received Jan 16, 2017 Revised Mar 18, 2017 Accepted Mar 30, 2017 5G technology is using millimeter-wave band to improve the wireless communication system. However, narrow transmitter and receiver beams have caused the beam coverage area to be limited. Due to propagation limitations of mm wave band, beam forming technology with multi-beam based communication system, has been focused to overcome ...

As part of the development of a new automotive bumper beam, a complete simulation of the entire forming process was carried out using LS-DYNA. The material for the beam was an ultra high strength steel presenting many challenges for the forming process. The sequence of forming operations was roll-forming (including forming a sweep in the initially straight roll-formed section), local annealing,...

In this paper, we consider a joint beam forming, power and channel allocation in a multi-user and multichannel underlay multiple input single output (MISO) cognitive radio network (CRN). In this system, primary users (PU’s) spectrum can be reused by the secondary user transmitters(SUTXs) to maximize the spectrum utilization while the intra-user interference is minimized by implementing bean for...

This paper gives a review for a new technique to give shape to metal by laser source is presented. Typically metal forming by Laser is contactless method in which laser beam is used as energy source and by inducing temperature induced stress in material, we can form material in various shapes. The main benefit of laser forming lies in its capability to form low ductility metal and with high acc...

-This paper discusses the deployment of Genetic algorithm optimization method for synthesis of antenna array radiation pattern in adaptive beam forming. The synthesis problem discussed is to find the weights of the antenna array elements that are optimum to provide the radiation pattern with maximum reduction in the side lobe level. This technique proved its effectiveness in improving the perfo...