scholarly journals Topological Design of Planar Circularly Polarized Directional Antenna with Low Profile Using Particle Swarm Optimization

2017 ◽  
Vol 2017 ◽  
pp. 1-12 ◽  
Author(s):  
Xiaonan Zhao ◽  
Junping Geng ◽  
Ronghong Jin ◽  
Yao Jin ◽  
Xiang Liu ◽  
...  
Keyword(s):  
Particle Swarm Optimization ◽  
Impedance Matching ◽  
Particle Swarm ◽  
High Gain ◽  
Directional Pattern ◽  
Directional Antenna ◽  
Antenna Gain ◽  
Swarm Optimization ◽  
Circularly Polarized ◽  
Low Profile

A topological method for the design and optimization of planar circularly polarized (CP) directional antenna with low profile was presented. By inserting two parasitic layers, generated by particle swarm optimization, between the equiangular spiral antenna and the ground, a low-profile wideband CP antenna with directional radiation pattern and high gain is achieved. The optimized antenna shows an impedance matching band (S11<-10 dB) of 4–12 GHz with a whole-band stable directional pattern in 4–11.5 GHz, and the antenna gain peak is 8 dBi, which work well in the available band. Measured return loss, antenna gain, and far field patterns agree well with simulation results.

scholarly journals Simultaneous Design of Low-Pass Filter with Impedance Matching Transformer for SONAR Transducer Using Particle Swarm Optimization

Energies ◽  
2019 ◽  
Vol 12 (24) ◽  
pp. 4646
Author(s):  
Jae-Hyuk Choi ◽  
Hyung-Soo Mok
Keyword(s):  
Particle Swarm Optimization ◽  
Impedance Matching ◽  
Particle Swarm ◽  
Acoustic Signals ◽  
Design Methods ◽  
Swarm Optimization ◽  
Pass Filter ◽  
Low Pass Filter ◽  
Simultaneous Design ◽  
Low Pass

Sound navigation and ranging (SONAR) systems detect a target in the front direction by using acoustic signals. A switching-type power conversion system is used to improve power efficiency, and an impedance matching circuit is used to decrease reactive power. A low-pass filter is used to improve the quality of acoustic signals. To achieve the desired voltage level for a SONAR transducer, a transformer is connected in series with a low-pass filter. In conventional design methods, design value errors occur because the components are designed independently and later combined. Moreover, if parameters that considerably impact operating characteristics are ignored in the design process, these errors will increase. Hence, time and cost losses are incurred during refabrication because operational characteristics differ from design values. To solve this problem, this study proposes the simultaneous design of a low-pass filter and impedance matching circuit, which includes critical design parameters, utilizing the particle swarm optimization algorithm. Moreover, conventional design methods were examined, and the superiority of the proposed design method to conventional methods was verified through analyses and experiments in terms of overall impedance phase and filter blocking characteristics.

scholarly journals Feasible Optimal Solutions of Electromagnetic Cloaking Problems by Chaotic Accelerated Particle Swarm Optimization

Mathematics ◽  
2021 ◽  
Vol 9 (21) ◽  
pp. 2725
Author(s):  
Alkmini Michaloglou ◽  
Nikolaos L. Tsitsas
Keyword(s):  
Particle Swarm Optimization ◽  
Optimization Problem ◽  
Particle Swarm ◽  
Optimization Procedure ◽  
Optimal Designs ◽  
Swarm Optimization ◽  
The Core ◽  
Low Profile ◽  
Accelerated Particle Swarm Optimization ◽  
Spherical Core

The optimization problem of cloaking a perfectly electric conducting or dielectric spherical core is investigated. The primary excitation is due to an external magnetic dipole. The chaotic accelerated particle swarm optimization (CAPSO) algorithm is adjusted and applied to this optimization problem. The optimization variables are the radii, the permittivities and the permeabilities of a small number of spherical shells covering the core. Several feasible optimal designs are obtained, which exhibit perfect or almost perfect cloaking performance for all angles of observation. These optimal designs correspond to two, three or four spherical coating layers composed of ordinary materials. Detailed parametric investigations of the cloaking mechanism with respect to the type and radius of the core and the location of the primary dipole are carried out. The presented optimization procedure and the reported results are expected to be useful in applications like scattering and characterization of optical particles as well as in designing low-profile receiving antennas.

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