Wide-Band High-Frequency Antennas for Military Vehicles: Design and testing low-profile half-loop, inverted-L, and umbrella NVIS antennas.

2016 ◽  
Vol 58 (6) ◽  
pp. 64-74 ◽  
Author(s):  
Maxim Ignatenko ◽  
Saurabh A. Sanghai ◽  
Gregor Lasser ◽  
Bradley Allen ◽  
Richard Smith ◽  
...  
Keyword(s):  
High Frequency ◽  
Wide Band ◽  
Military Vehicles ◽  
Low Profile ◽  
Half Loop ◽  
Design And Testing

scholarly journals A Low-Profile HF Meandered Dipole Antenna with a Ferrite-Loaded Artificial Magnetic Conductor

2021 ◽  
Vol 11 (5) ◽  
pp. 2237
Author(s):  
Oh Heon Kwon ◽  
Won Bin Park ◽  
Juho Yun ◽  
Hong Jun Lim ◽  
Keum Cheol Hwang
Keyword(s):  
High Frequency ◽  
Dipole Antenna ◽  
Unit Cell ◽  
Operating Frequency ◽  
High Permeability ◽  
Magnetic Conductor ◽  
Artificial Magnetic Conductor ◽  
Low Profile ◽  
Compact Size ◽  
Binary Genetic Algorithm

In this paper, a low-profile HF (high-frequency) meandered dipole antenna with a ferrite-loaded artificial magnetic conductor (AMC) is proposed. To operate in the HF band while retaining a compact size, ferrite with high permeability is applied to the unit cell of the AMC. The operating frequency bandwidth of the designed unit cell of the AMC is 1.89:1 (19–36 MHz). Thereafter, a meandered dipole antenna is designed by implementing a binary genetic algorithm and is combined with the AMC. The overall size of the designed antenna is 0.06×0.06×0.002 λ3 at the lowest operating frequency. The proposed dipole antenna with a ferrite-loaded AMC is fabricated and measured. The measured VSWR bandwidth (<3) covers 20–30 MHz on the HF band. To confirm the performance of the antenna, a reference monopole antenna which operates on the HF band was selected, and the measured receiving power is compared with the result of the proposed antenna with the AMC.

scholarly journals Band notched self complementaryultra wideband antenna for wireless applications

2018 ◽  
Vol 7 (2.8) ◽  
pp. 529 ◽  
Author(s):  
Ch Ramakrishna ◽  
G A.E.Satish Kumar ◽  
P Chandra Sekhar Reddy
Keyword(s):  
High Frequency ◽  
Return Loss ◽  
Wide Band ◽  
Ultra Wideband ◽  
Impedance Bandwidth ◽  
Relative Dielectric Permittivity ◽  
Frequency Range ◽  
Ground Structure ◽  
Wireless Applications ◽  
Patch Edge

This paper presents a band notched WLAN self complementaryultra wide band antenna for wireless applications. The proposed antenna encounters a return loss (RL) less than -10dB for entire ultra wideband frequency range except band notched frequency. This paper proposes a hexagon shape patch, edge feeding, self complementary technique and defective ground structure. The antenna has an overall dimensionof 28.3mm × 40mm × 2mm, builton  substrate FR4 with a relative dielectric permittivity 4.4. And framework is simulated finite element method with help of high frequency structured simulator HFSSv17.2.the proposed antenna achieves a impedance bandwidth of 8.6GHz,  band rejected WLAN frequency range 5.6-6.5 GHz with  vswr is less than 2.

scholarly journals Research and Fabrication of High-Frequency Broadband and Omnidirectional Transmitting Transducer

Sensors ◽  
2018 ◽  
Vol 18 (7) ◽  
pp. 2347 ◽  
Author(s):  
Shaohua Hao ◽  
Hongwei Wang ◽  
Chao Zhong ◽  
Likun Wang ◽  
Hao Zhang
Keyword(s):  
Composite Material ◽  
High Frequency ◽  
Wide Band ◽  
Simulation Software ◽  
Piezoelectric Composite ◽  
Voltage Response ◽  
Forming Process ◽  
Composite Ring ◽  
Matching Layer ◽  
Acoustic Transducer

A wide-band cylindrical transducer was developed by using the wide band of the composite material and the matched matching layer for multimode coupling. Firstly, the structure size of the transducer’s sensitive component was designed by using ANSYS simulation software. Secondly, the piezoelectric composite ring-shaped sensitive component was fabricated by the piezoelectric composite curved-surface forming process, and the matching layer was coated on the periphery of the ring-shaped piezoelectric composite material. Finally, it was encapsulated and the electrodes were drawn out to make a high-frequency broadband horizontal omnidirectional water acoustic transducer prototype. After testing, the working frequency range of the transducer was 230–380 kHz, and the maximum transmission voltage response was 168 dB in the water.

scholarly journals Substrate-Integrated Waveguide Microwave Sensor for Water-in-Diesel Fuel Applications

2021 ◽  
Vol 11 (21) ◽  
pp. 10454
Author(s):  
Antonella Maria Loconsole ◽  
Vito Vincenzo Francione ◽  
Vincenza Portosi ◽  
Onofrio Losito ◽  
Michele Catalano ◽  
...  
Keyword(s):  
Diesel Fuel ◽  
Low Cost ◽  
Water Concentration ◽  
Wide Band ◽  
Coefficient Of Determination ◽  
Substrate Integrated Waveguide ◽  
Scattering Parameter ◽  
Low Profile ◽  
Waveguiding Structure ◽  
Microwave Sensor

A water-in-diesel microwave sensor based on a substrate integrated waveguide (SIW) microwave applicator is designed and characterized in this study. The interaction between the microwave electromagnetic field and the diesel fuel contaminated with small concentrations of water is obtained via suitable radiating slots placed on the top of an SIW waveguiding structure. The SIW applicator working frequency is chosen by observing the behavior of the complex dielectric permittivity of the fuel–water blend based on a preliminary wide band investigation. The performances of the SIW microwave sensor are evaluated in terms of scattering parameter modulus |S21| as a function of the water concentration in ppm. The best sensitivity Δ|S21|Δρ=1.42 mdB/ppm is obtained at a frequency of f=9.76 GHz, with a coefficient of determination R2=0.94. The sensor is low-cost, low profile and ensures a good sensitivity for constant and real-time monitoring.

A new high frequency wide band 180� differential power splitter

1996 ◽  
Vol 11 (3) ◽  
Author(s):  
Javier Gonzalez ◽  
Andres Guerrero ◽  
Isabelle Telliez
Keyword(s):  
High Frequency ◽  
Wide Band ◽  
Power Splitter

High Frequency Modeling of Smart Sensor for Precise Power Quality Assessment Using Fuzzy Logic

2016 ◽  
Vol 25 (06) ◽  
pp. 1650056 ◽  
Author(s):  
G. Sudha ◽  
K. R. Valluvan
Keyword(s):  
Fuzzy Logic ◽  
Quality Assessment ◽  
Power Quality ◽  
High Frequency ◽  
Wide Band ◽  
Electrical Equipment ◽  
Distribution Networks ◽  
Accurate Method ◽  
Energy Difference ◽  
Critical Issue

Power Quality Assessment (PQA) is a critical issue both in transmission and distribution networks. Therefore, it is necessary to precisely classify the disturbances in shortest possible time to prevent the malfunction or increase of losses in the electrical equipment through appropriate remedial techniques. This paper proposes a highly accurate method of PQA through data acquisition using smart sensors, the Rogowski coils (RCs). RCs with wide band width and linear characteristics allow faithful reproduction of high-frequency (HF) signals. In the proposed method, simulated disturbance signals are applied to RC. The output signals are subjected to multilevel wavelet decomposition and then computation of the energy difference in the detailed components between the disturbance signal and the pure sinusoidal waveform is performed to design a fuzzy logic Power Quality Classifier. The classifier is tested by varying the magnitude, frequency and duration of the disturbance and found to be accurate to 98.38%. The classification accuracy depends mainly on the performance of sensors at HFs. Thus, with RCs as sensors instead of conventional instrument transformers, it is found that the precision of power quality classification is greatly improved.

A New Design of Ka-Band Circularly-Polarized Antenna

2014 ◽  
Vol 631-632 ◽  
pp. 383-386
Author(s):  
Jiao Jiao Fan ◽  
Jian Li ◽  
Dan Song ◽  
Li Wu ◽  
Shu Sheng Peng
Keyword(s):  
High Frequency ◽  
Circular Waveguide ◽  
Ka Band ◽  
Circularly Polarized ◽  
Simulation And Optimization ◽  
Total Height ◽  
High Frequency Structure Simulator ◽  
Frequency Structure ◽  
Low Profile ◽  
Linearly Polarized

A new ka-band circularly-polarized antenna is presented in this paper, in which a linearly-polarized wave is conversed into a circularly-polarized wave with a circular waveguide polarizer. After simulation and optimization with HFSS (High Frequency Structure Simulator), a compact circularly-polarized antenna is designed with a total height less than 25mm. More simple and easier structure is adopted to achieve a low-profile circularly-polarized antenna.

Design and Testing of a High Frequency Thermoacoustic Combustion Experiment

AIAA Journal ◽  
2021 ◽  
pp. 1-17
Author(s):  
Vahid Sharifi ◽  
Christian Beck ◽  
Bertram Janus ◽  
Andreas M. Kempf
Keyword(s):  
High Frequency ◽  
Combustion Experiment ◽  
Design And Testing
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