Collaborative beamforming (CBF) with a finite number of collaborating nodes (CNs) produces sidelobes that are highly dependent on the collaborating nodes' locations. The sidelobes cause interference and affect the communication rate of unintended receivers located within the transmission range. Nulling is not possible in an open-loop CBF since the collaborating nodes are unable to receive feedb...

This paper proposes a three-dimensional (3-D) amplitude tapering technique on volumetric random arrays to minimize array sidelobes and emulate phased operations mobile platforms. Our ultimate goal is realize wireless applications carried out by platforms; in this paper, we focus the development of collaborative beamforming algorithms. beamshaping mitigates discontinuity current distribution alo...

A teaching-learning-based optimization (TLBO) algorithm is a new population-based algorithm applied in some applications in the literature successfully. Moreover, a genetic algorithm (GA) is a popular tool employed widely in many disciplines of engineering. In this paper, a hybrid GA-TLBO algorithm is proposed for the capacitated three-stage supply chain network design (SCND) problem. The SCND ...

This article proposes a systematic approach for stacking uniform linear arrays (ULAs) of different sizes to reduce sidelobes and form nulls the radiated beam pattern. In sidelobe reduction, vertically stacked ULAs are aligned overall level (SLL). nulling, varying length configure null direction simultaneously sidelobes. Both approaches relaxed ensure feasibility implementation. The methods stud...

In this paper, a novel multi-layered waveguide-fed slotted cavity antenna array operating in the K-band (i.e., 18–27 GHz) is presented. The composed of 64 (8 × 8) groups 2 subarrays with low profile, and fed by 1–64 ways waveguide corporate-feed-network. order to obtain sidelobe level (SLL), Chebyshev power distribution introduced into feeding network accurately taper among subarrays. To realiz...

In this paper, a novel method to decrease the sidelobe level (SLL) of conformal leaky-wave antennas (CLWAs) which are synthesized based on holographic techniques is proposed. For purpose, relation modified by using modulation index as function spatial component corresponding propagation direction reference wave. order create fascinating impedance matching between launcher and radiative metasurf...

in this paper, we present an application of evolved neural networks using a real coded genetic algorithm for simulations of monthly groundwater levels in a coastal aquifer located in the shabestar plain, iran. after initializing the model with groundwater elevations observed at a given time, the developed hybrid genetic algorithm-back propagation (ga-bp) should be able to reproduce groundwater ...

A novel fractal antenna-array type is proposed. The design is based on the Sierpinski rectangular carpet concept. However, the generator is a circular ring area, filled with radiating elements, so the higher stages of the fractal development produce large arrays of circular rings which, besides the high directivity, have the advantage of the almost uniform azimuthal radiation pattern, attribute...

This work designs a 60 GHz rhombic patch array antenna with high gain, low sidelobe level (SLL), and reduced area. consists of eight linear serial arrays varying number patches. A slot-coupled center-fed structure substrate-integrated waveguide (SIW) is designed to simplify the complex feed network required for direct excitation planar reduce insertion loss. The configuration utilizes quantity ...