scholarly journals Control of the Radiation Patterns Using Homogeneous and Isotropic Impedance Metasurface

2015 ◽  
Vol 2015 ◽  
pp. 1-7 ◽  
Author(s):  
Fan Yang ◽  
Zhong Lei Mei ◽  
Tie Jun Cui
Keyword(s):  
Point Source ◽  
Surface Impedance ◽  
High Selectivity ◽  
Two Dimensional ◽  
Radiation Patterns ◽  
Wave Simulation ◽  
Full Wave ◽  
Low Profile ◽  
Simulation Results

We propose to control the radiation patterns of a two-dimensional (2D) point source by using impedance metasurfaces. We show that the radiation patterns can be manipulated by altering the surface impedance of the metasurface. Full-wave simulation results are provided to validate the theoretical derivations. The proposed design enjoys novel properties of isotropy, homogeneity, low profile, and high selectivity of frequency, making it potentially applicable in many applications. We also point out that this design can be implemented with active metasurfaces and the surface impedance can be tuned by modulating the value of loaded elements, like resistors, inductors, and capacitors.

scholarly journals Ultrawideband Low-Profile and Miniaturized Spoof Plasmonic Vivaldi Antenna for Base Station

2020 ◽  
Vol 10 (7) ◽  
pp. 2429 ◽  
Author(s):  
Li Hui Dai ◽  
Chong Tan ◽  
Yong Jin Zhou
Keyword(s):  
Radiation Pattern ◽  
Frequency Band ◽  
High Gain ◽  
Base Station ◽  
Ultra Wideband ◽  
Radiation Patterns ◽  
Low Profile ◽  
Simulation Results ◽  
Vivaldi Antenna ◽  
Good Agreement

Stable radiation pattern, high gain, and miniaturization are necessary for the ultra-wideband antennas in the 2G/3G/4G/5G base station applications. Here, an ultrawideband and miniaturized spoof plasmonic antipodal Vivaldi antenna (AVA) is proposed, which is composed of the AVA and the loaded periodic grooves. The designed operating frequency band is from 1.8 GHz to 6 GHz, and the average gain is 7.24 dBi. Furthermore, the measured results show that the radiation patterns of the plasmonic AVA are stable. The measured results are in good agreement with the simulation results.

scholarly journals Low-Cost Dielectric Substrate for Designing Low Profile Multiband Monopole Microstrip Antenna

2014 ◽  
Vol 2014 ◽  
pp. 1-10 ◽  
Author(s):  
M. R. Ahsan ◽  
M. T. Islam ◽  
M. Habib Ullah ◽  
H. Arshad ◽  
M. F. Mansor
Keyword(s):  
Microstrip Antenna ◽  
Dielectric Material ◽  
Low Cost ◽  
Cost Effective ◽  
Dielectric Substrate ◽  
The Finite Element Method ◽  
Radiation Patterns ◽  
Polymer Resin ◽  
Full Wave ◽  
Low Profile

This paper proposes a small sized, low-cost multiband monopole antenna which can cover the WiMAX bands and C-band. The proposed antenna of 20 × 20 mm2radiating patch is printed on cost effective 1.6 mm thick fiberglass polymer resin dielectric material substrate and fed by 4 mm long microstrip line. The finite element method based, full wave electromagnetic simulator HFSS is efficiently utilized for designing and analyzing the proposed antenna and the antenna parameters are measured in a standard far-field anechoic chamber. The experimental results show that the prototype of the antenna has achieved operating bandwidths (voltage stand wave ratio (VSWR) less than 2) 360 MHz (2.53–2.89 GHz) and 440 MHz (3.47–3.91 GHz) for WiMAX and 1550 MHz (6.28–7.83 GHz) for C-band. The simulated and measured results for VSWR, radiation patterns, and gain are well matched. Nearly omnidirectional radiation patterns are achieved and the peak gains are of 3.62 dBi, 3.67 dBi, and 5.7 dBi at 2.66 GHz, 3.65 GHz, and 6.58 GHz, respectively.

scholarly journals A Miniaturized Transmitting LPDA Design for 2 MHz–30 MHz Uses

Sensors ◽  
2021 ◽  
Vol 21 (18) ◽  
pp. 6034
Author(s):  
Wenjun Zhu ◽  
Lixin Guo
Keyword(s):  
High Frequency ◽  
Optimization Methods ◽  
Directional Pattern ◽  
Electrical Performance ◽  
Impedance Bandwidth ◽  
Gain Bandwidth ◽  
Wave Simulation ◽  
Full Wave ◽  
Coefficient Optimization ◽  
Simulation Results

A miniaturized horizontal polarized high frequency transmitting LPDA is presented. In use of the dipole transformation and antenna coefficient optimization methods, a 65% reduction in the size was achieved with the electrical performance kept in a competitive level. Full-wave simulation results showed a stable directional pattern and lower VSWR over the impedance bandwidth of 2 to 30 MHz. The gain bandwidth can reach the range of 4–30 MHz, meanwhile, there is only minor degradation on gain in frequencies under 4 MHz.

scholarly journals A Miniaturized Dual-Mode Bandpass Filter Using Slot Spurline Technique

2013 ◽  
Vol 2013 ◽  
pp. 1-6 ◽  
Author(s):  
Haiwen Liu ◽  
Jiuhuai Lei ◽  
Jing Wan ◽  
Yan Wang ◽  
Feng Yang ◽  
...  
Keyword(s):  
Elliptic Function ◽  
Bandpass Filter ◽  
Dual Mode ◽  
Wave Simulation ◽  
Full Wave ◽  
Filter Characteristic ◽  
Simulation Results ◽  
Degenerate Modes ◽  
Good Agreement

A miniaturized dual-mode bandpass filter (BPF) with elliptic function response using slot spurline is designed in this paper. The slot spurline can not only splits the degenerate modes but also determine the type of filter characteristic (Chebyshev or elliptic). To miniaturize the resonator, four sagittate stubs are proposed. For demonstration purpose, a BPF operating at 5.75 GHz for WLAN application was designed, fabricated, and measured. The measured results are in good agreement with the full-wave simulation results.

Tunable High-Q TSV Inductor Packaging with MEMS

2015 ◽  
Vol 2015 (1) ◽  
pp. 000062-000066 ◽  
Author(s):  
Bruce Kim ◽  
Saikat Mondal ◽  
Sang-Bock Cho
Keyword(s):  
Mechanical Systems ◽  
Micro Electro Mechanical Systems ◽  
Frequency Bands ◽  
High Isolation ◽  
High Q ◽  
Wave Simulation ◽  
Full Wave ◽  
Leakage Resistance ◽  
Simulation Results ◽  
Tunable Inductor

In this paper, we present a Through-Silicon-Via (TSV)-based 3D tunable inductor implementation for RF applications. The proposed inductor structure uses MEMS (Micro Electro-Mechanical Systems) switches to vary inductance by activating and deactivating the switches. MEMS-based switches are used to offer high isolation in the off state. The tunable inductor is tested within an LNA circuit for variation in off-state leakage resistance. Detailed 3D full wave simulation results are presented for different cellular frequency bands.

scholarly journals Two-dimensional full-wave simulation of microwave reflectometry on Alcator C-Mod

2001 ◽  
Vol 72 (1) ◽  
pp. 344-347 ◽  
Author(s):  
Y. Lin ◽  
J. H. Irby ◽  
R. Nazikian ◽  
E. S. Marmar ◽  
A. Mazurenko
Keyword(s):  
Two Dimensional ◽  
Wave Simulation ◽  
Full Wave

scholarly journals Analysis and Design of Ultra-Wideband 3-Way Bagley Power Divider Using Tapered Lines Transformers

2012 ◽  
Vol 2012 ◽  
pp. 1-6 ◽  
Author(s):  
Khair Al Shamaileh ◽  
Abdullah Qaroot ◽  
Nihad Dib ◽  
Abdelfattah Sheta ◽  
Majeed A. Alkanhal
Keyword(s):  
Design Procedure ◽  
Ultra Wideband ◽  
Power Divider ◽  
Frequency Range ◽  
Analysis And Design ◽  
Wave Simulation ◽  
Full Wave ◽  
Quarter Wave ◽  
Simulation Results

An ultra-wideband (UWB) modified 3-way Bagley polygon power divider (BPD) that operates over a frequency range of 2–16 GHz is presented. To achieve the UWB operation, the conventional quarter-wave transformers in the BPD are substituted by two tapered line transformers. For verification purposes, the proposed divider is simulated, fabricated, and measured. The agreement between the full-wave simulation results and the measurement ones validates the design procedure.

scholarly journals Tailoring the scattering properties of coding metamaterials based on machine learning

2021 ◽  
Vol 8 ◽  
pp. 15
Author(s):  
Shuai Yang ◽  
Kuang Zhang ◽  
Xumin Ding ◽  
Guohui Yang ◽  
Qun Wu
Keyword(s):  
Machine Learning ◽  
Genetic Algorithm ◽  
Pattern Analysis ◽  
Analytical Calculation ◽  
Scattering Pattern ◽  
Wave Simulation ◽  
Full Wave ◽  
Binary Coding ◽  
Calculation Results ◽  
Simulation Results

Diverse electromagnetic (EM) responses of coding metamaterials have been investigated, and the general research method is to use full-wave simulation. But if we only care its scattering properties, it is not necessary to perform full-wave simulation, which is usually time-consuming. Machine learning has significantly impelled the development of automatic design and optimize coding matrix. Based on metamaterial particle that has multiple response and genetic algorithm which is coupled with the scattering pattern analysis, we can optimize the coding matrix quickly to tailor the scattering properties without conducting full-wave simulation a lot of times for optimization. Since the coding matrix control of each particle allow modulation of EM wave, various EM phenomena can be achieved easier. In this paper, we proposed two reflective unitcells with different reflection phase, and then a semi-analytical model is built up for unitcells. To tailor the scattering properties, genetic algorithm normally based on binary coding, is coupled with the scattering pattern analysis in order to optimize the coding matrix. Finally, simulation results are compared with the semi-analytical calculation results and it is found that the simulation results agree very well with the theoretical values.

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