Synthesising multiple‐pattern sparse linear array with accurate sidelobe control by the extended reweighted L1‐norm minimisation

Abstract

Improving the structural stability and the electron/ion diffusion rate across whole electrode particles is crucial for transition metal oxides as next-generation anodic materials in lithium ion batteries. Herein, we report a novel structure of double carbon coated Co3O4 cross-linked composite, where Co3O4 nanoparticle is in-situ covered by nitrogen-doped carbon and further connected by carbon nanotubes (Co3O4 NP@NC@CNTs). This double carbon coated Co3O4 NP@NC@CNTs framework not only endows a porous structure that can effectively accommodate the volume changes of Co3O4, but also provides multidimensional pathways for electronic/ionic diffusion in and among the Co3O4 nanoparticles. As expected, the Co3O4 NP@NC@CNTs electrode exhibits unprecedented lithium storage performance, with high reversible capacity of 1017 mAh g-1 after 500 cycles at 1 A g-1 , and very good capacity retention of 75%, even after 5000 cycles at 15 A g-1. The lithiation/delithiation process of Co3O4 NP@NC@CNTs is dominated by pesudocapacitive behavior, resulting in excellent rate performance and durable cycle stabiltiy. Electrochemical kinetics further reveals a decreased energy barrier for electron/ion transport, synergistically, contributes to its excellent lithium storage performance.

Diversely polarised sparse array design with minimum interelement spacing constraint for polarised pattern synthesis

“…More specifically, the radiated power in the sidelobe angle region S is desired to be lower than a certain level SLL, i.e. E(u s ) 2 2 ≤ SSL for ∀u s [ S. While for the mainlobe in the direction u 0 , we want to obtain normalised spatial power and desired polarisation status, i.e. E(u 0 ) = j(a 0 , b 0 ).…”

“…Introduction: The problem of sparse array design for the synthesis of desired radiation patterns with minimum radiating antennas is of great interest in radar, remote sensing and wireless communication, owing to the potential reduction of weight, cost and feeding network complexity [1,2]. To improve the capacity of the communication system or to capture the polarimetric information of radar target, diversely polarised sparse array synthesis for polarised beampattern has attracted more and more attention in recent years [3].…”

“…Compressive sensing (CS) based methods have shown great advantages in solving these problems, for the reason that when certain conditions are met, the array element locations, along with their excitations, can be simultaneously determined by solving some convex optimisation problems [1,2,4].…”

Research on Side Lobe Suppression of Time-Modulated Sparse Linear Array Based on Particle Swarm Optimization

“…According to the mathematical formula mentioned in [22], the array factor without noise interference can be obtained as…”

“…2009.0042, and DOI: 10.1109/LAWP.2014.2299285. ese prior studies (and datasets) are cited at relevant places within the text as references [22], [23], [21], and [24].…”