scholarly journals Design of Window Grille Shape-Based Multiband Antenna for Mobile Terminals

2021 ◽  
Vol 2021 ◽  
pp. 1-14
Author(s):  
Zhen Yu ◽  
Yao Li ◽  
Ziheng Lin ◽  
Xiaoying Ran
Keyword(s):  
Microstrip Antenna ◽  
Mobile Terminal ◽  
Simulation Software ◽  
Navigation Systems ◽  
Test Results ◽  
Effective Current ◽  
Current Path ◽  
Plate Shape ◽  
Feed Mode ◽  
Ground Plate

Combined with the classic Chinese window grille structure, this paper proposes and designs a multiband microstrip antenna that can be used in wireless mobile terminal equipment. The antenna radiator adopts a rectangular bending structure with four loops, which increases the effective current path of the antenna radiator in a limited space, so that the overall antenna is miniaturized. The branch structure of the four-ring phase set increases the current path of the antenna, making the antenna multiband. The electromagnetic simulation software HFSS was used for antenna modeling and parameter optimization, and the influence of the feed structure, feed mode, and ground plate shape on the antenna was compared and analyzed. The test results show that the antenna can cover four bands, 0.85–1.1 GHz, 1.2–1.8 GHz, 2.40–2.7 GHz, and 5.05–6.3 GHz, and produce 6 main frequency points, 0.9 GHz, 1.3 GHz, 1.6 GHz, 2.55 GHz, 5.3 GHz, and 6.05 GHz. The antenna can cover various navigation systems, Bluetooth, WLAN, ISM frequency band, and 5G (5.725–5.825 GHz).

The Design of Ceramic Minkowski Fractal Antenna

2014 ◽  
Vol 1006-1007 ◽  
pp. 1010-1013
Author(s):  
Xiu Bin Ye ◽  
Guo Peng Kou ◽  
Yi Juan Ji
Keyword(s):  
Microstrip Antenna ◽  
High Performance ◽  
Fractal Structure ◽  
Fractal Antenna ◽  
Test Results ◽  
Antenna Performance ◽  
Rfid System ◽  
Ground Plate ◽  
Rfid Applications ◽  
Minkowski Fractal

Antennas play an important role in RFID system. As one of the key technology of RFID, the antenna design decides the RFID system performance. This paper designed a ceramic Minkowski fractal antenna used in RFID system. It used Minkowski fractal structure as the radiation patch and the high performance ceramic material to reduce the antenna size, then improve it with rectangular joint structure in the antenna's ground plate. In this paper, the antenna performance are analyzed in the simulation, In this paper, the antenna performance are analyzed in the simulation, it discussed the thickness of the medium plate and the effect of dielectric constant on the performance of microstrip antenna, finally make antenna samples for testing. The simulation and test results show the antenna designed meet the requirement of RFID applications.

Dual-layered polarization and frequency reconfigurable microstrip antenna by rotating breach-truncated circular radiator

2017 ◽  
Vol 9 (8) ◽  
pp. 1705-1712
Author(s):  
Haixiong Li ◽  
Yunlong Gong ◽  
Jiakai Zhang ◽  
Jun Ding ◽  
Chenjiang Guo
Keyword(s):  
Reflection Coefficient ◽  
Circular Polarization ◽  
Microstrip Antenna ◽  
Axial Ratio ◽  
Axial Rotation ◽  
Polarization Characteristic ◽  
The Novel ◽  
Test Results ◽  
Left Handed ◽  
Mechanical Rotation

In this study, a dual-layered polarization and frequency reconfigurable microstrip antenna is proposed based on sequential mechanical axial rotation of the circular metal radiator. The antenna can be reconfigured among three different polarized modes, including the linear polarization (LP), left-handed circular polarization and right-handed circular polarization in the band from 4.68 to 4.80 GHz (2.53%). The resonance frequency of the proposed antenna with the same LP mode could also be tuned in the range from 4.70 to 5.03 GHz by mechanical rotation of the breach-truncated circular metal radiator as well as the circular substrate. Furthermore, the polarization characteristic and frequency can be reconfigured, respectively, as the circular radiator is taken an axial rotation with an angle of 360°. The presented antenna in the four different states has been numerically simulated and fabricated for the experimental measurement, the investigated characteristics includes the port reflection coefficient, axial ratio, radiation pattern, gain, and the radiation efficiency. The simulated and test results agreed well with each other. This antenna enriches the novel mechanical reconfigurable method except for the popular electrical approach.

Transient Lift-Off Test Results for an Experimental Hybrid Bearing in Air, Simulating a Liquid Hydrogen Turbopump Start Transient

2016 ◽  
Author(s):  
Dara W. Childs ◽  
David Klooster ◽  
Henry Borchard ◽  
Dustin Pavelek ◽  
Stephen Phillips
Keyword(s):  
Rocket Engine ◽  
Transient Behavior ◽  
Simulation Software ◽  
Test Results ◽  
Unit Load ◽  
Ramp Rate ◽  
Fluid Medium ◽  
Supply Pressure ◽  
Lift Off ◽  
Point Of Departure

Start-transient testing of a hybrid (combined hydrostatic and hydrodynamic action) bearing supplied with air was completed, providing an indication of its performance while operating in a compressible fluid medium. The test start transients were modeled after Rocket Engine Transient Simulation Software (ROCETS) predictions for start-transient behavior of running speed ω(t) and bearing supply pressure Ps(t). The top test speed was 15 krpm. The ramp rate, supply pressure Ps values at 15 krpm, constant bearing unit load magnitude w0, and load orientation (load-on-recess LOR or load-on-land LOL) were varied. Five different load-case combinations were carried out (separately) for LOR and LOL load configurations with ramp rates varying from 2206 rpm/s to 8824 rpm/s. The target pressures at 15 krpm varied from 5.32 bars to 18.25 bars. The tested bearing dimensions were: L = D = 38.1 mm, and Cr =.0635 mm. Lift-off occurs due to the increase in Ps (ω dependent) and was defined as the point of departure towards the center of the bearing with increasing ω while the rotor remained 0.00254 mm (0.1 mils) above the bearing surface. This method is limited by the inability to accurately measure an established operating bearing clearance. Evaluation of the lift-off Ps versus applied unit load w0 supports the following conclusions: (1) Lift-off Ps is approximately a linear function of w0, (2) Changing the ramp rate while keeping constant the specified Ps at 15 krpm has no significant impact, (3) Lowering the limit Ps at 15 krpm may reduce the lift-off Ps value, and (4) The LOR start-transient cases required a higher lift-off speed and lift-off Ps values than the corresponding LOL start-transient cases.

scholarly journals Research and Application of Heavy-Equipment Parachute Rope Tension Sensor

2018 ◽  
Vol 2018 ◽  
pp. 1-10
Author(s):  
Min Yao ◽  
Yanhua Jin ◽  
Min Zhao ◽  
Shaohua Xu
Keyword(s):  
Particle Swarm Optimization Algorithm ◽  
Test System ◽  
Simulation Software ◽  
Support Vector ◽  
Test Results ◽  
Maximum Weight ◽  
Swarm Optimization ◽  
Ansys Simulation ◽  
Heavy Equipment ◽  
Tension Sensor

Heavy-equipment airdrops are mainly used to deliver relief supplies and heavy weapons. Given the heavy weight of the goods, the tension of the extraction and brake ropes of the parachute significantly affects the safety of the aircraft. On the basis of the measurement and installation characteristics of the parachute rope, this study designed the structure of a nondestructive pressure-type parachute rope tension sensor and set the location of the strain gauge patch using the ANSYS simulation software to obtain a high sensor sensitivity. The temperature error of the tension sensor is compensated, and the precision is improved using the LSSVM-PSO (Least Squares Support Vector Machine-Particle Swarm Optimization) algorithm. The developed tension sensor is applied to the extraction parachute test system to measure the traction of 2 and 8 m2 parachutes. Test results show that the maximum weight of the platform these two parachutes can draw and the effect of parachute opening can be calculated.

The Use of Auxiliary Airborne Sensor Data in SPACE-M Photogrammetric Block Adjustments

1984 ◽  
Vol 38 (1) ◽  
pp. 3-14
Author(s):  
J. A. R. Blais ◽  
M. A. Chapman
Keyword(s):  
Global Positioning System ◽  
Mathematical Formulation ◽  
Real Data ◽  
Sensor Data ◽  
Navigation Systems ◽  
Test Results ◽  
Inertial Navigation Systems ◽  
Adjustment Program ◽  
Global Positioning ◽  
Topographical Mapping

The mathematical formulation used in the photogrammetric block adjustment program SPACE-M has recently been extended to accommodate auxiliary airborne sensor data corresponding to the position and/or attitude of the aerial camera at the time of film exposure. Examples of such systems are statoscopes, laser profilometers, Inertial Navigation Systems (INS) and the Global Positioning System (GPS). The description of the use of these auxiliary data in SPACE-M is outlined and references are given to other related formulations. Test results with simulated and limited real data are presented with some analysis of the implications for topographical mapping and other applications.

scholarly journals Measuring the Lighting Quality in Academic Institutions: The UPM Faculty of Aerospace Engineering (Spain)

2020 ◽  
Vol 10 (23) ◽  
pp. 8345
Author(s):  
María Zamarreño-Suárez ◽  
Daniel Alcala-Gonzalez ◽  
Daniel Alfonso-Corcuera ◽  
Santiago Pindado
Keyword(s):  
Measured Data ◽  
Simulation Software ◽  
Aerospace Engineering ◽  
Fine Tuning ◽  
Current Status ◽  
Test Results ◽  
Wear And Tear ◽  
Lighting Simulation ◽  
Low Levels ◽  
Lighting Systems

This article analyzes the current status of the lighting quality at the Escuela Técnica Superior de Ingeniería Aeronáutica y del Espacio (ETSIAE), the aerospace engineering faculty at the Universidad Politécnica de Madrid (UPM), and evaluates possible improvement actions based on the use of DIALux® lighting simulation software together with measured data. The results show rather low levels of measured illuminance on classroom desks and blackboards in one of the buildings comprising the faculty. The improvements proposed (a new coat of paint on the walls and replacement of luminaires) were simulated in four individual classrooms representing all rooms in two of the ETSIAE buildings (where the lower illuminance levels were measured). In order to study these improvements, the current situation of the four selected classrooms was simulated using DIALux® and fine-tuning attenuation of the luminaires to take into account their wear and tear. The correlation between the DIALux® simulation and the test results was analyzed with quite good results. The results clearly reveal a need to fully replace the classroom lighting systems in ETSIAE building A (the oldest building, dating back to 1955). According to the results from the selected classrooms, the average lighting over the desks can be greatly improved by using LED technology in order to meet UNE 12464-1 standard (that is, 500 lx, from an initial situation with much lower illuminance values: 129 lx to 295 lx). This article represents an innovative way to perform lighting improvement projects as real measured lighting data is used as initial input for the lighting simulations.

Hysteresis Compensation Control Strategy for Pneumatic ABS System of Commercial Vehicle and HIL Test Validation

2013 ◽  
Vol 694-697 ◽  
pp. 1545-1548
Author(s):  
Jong Chol Han ◽  
Chang Fu Zong ◽  
Hong Yu Zheng
Keyword(s):  
Control Strategy ◽  
Test Bench ◽  
Commercial Vehicle ◽  
Simulation Software ◽  
Hardware In The Loop ◽  
Test Results ◽  
Hysteresis Compensation ◽  
Braking System ◽  
Vehicle Active Safety ◽  
Hysteresis Characteristics

A control strategy for pneumatic ABS(Anti-lock Braking System) of commercial vehicle has been developed and validated by combining with Trucksim simulation software and by using hardware-in-the-loop test bench for hysteresis characteristics compensation. The test results show that the ABS control strategy satisfies the control requirements for system hysteresis characteristics, and improve the performance of pneumatic ABS system for commercial vehicle effectively, thus vehicle active safety is increased.

scholarly journals Testing Computational Magnetohydrodynamics Algorithms with a Problem Having an Exact Solution

2020 ◽  
pp. 29-37
Author(s):  
В. А. Галкин ◽  
А. В. Гореликов ◽  
И. В. Бычин ◽  
А. О. Дубовик ◽  
А. В. Ряховский
Keyword(s):  
Exact Solution ◽  
Software Package ◽  
Numerical Solutions ◽  
Gpu Computing ◽  
Simulation Software ◽  
Computational Algorithms ◽  
Test Results ◽  
Magnetohydrodynamic Equations ◽  
Computing Systems ◽  
Magnetohydrodynamic Simulation

Представлены результаты тестирования разработанного пакета программ для численного моделирования задач магнитной гидродинамики. Программный комплекс создан с использованием технологии CUDA Fortran и ориентирован на вычислительные системы с графическими процессорами. Получено точное трехмерное решение системы уравнений магнитной гидродинамики, которое использовалось для тестирования реализованных вычислительных алгоритмов. Результаты тестовых расчетов демонстрируют корректность получаемых численных решений. The results of testing the magnetohydrodynamic simulation software package developed by the authors are presented. The software package was developed with CUDA Fortran and is intended for GPU computing systems. An exact 3D solution of the system of magnetohydrodynamic equations was obtained and applied to testing the computational algorithms. The test results demonstrate that the numerical solutions are valid.

scholarly journals Effects of dielectric substrate material microstrip antenna for limited band applications

2021 ◽  
Vol 2070 (1) ◽  
pp. 012124
Author(s):  
Ravi Shankar Saxena ◽  
S Kavitha ◽  
Ashish Singh ◽  
Anurag Mishra
Keyword(s):  
Radiation Pattern ◽  
Patch Antenna ◽  
Microstrip Antenna ◽  
Dielectric Substrate ◽  
Substrate Material ◽  
Microstrip Patch Antenna ◽  
Simulation Software ◽  
Dielectric Constants ◽  
Dual Frequency ◽  
Microstrip Patch

Abstract In this paper, an analysis of dual frequency resonance antenna is achieved by OM-shape microstrip patch antenna. The proposed antenna is analyzed using IE3D simulation software. The analysis of proposed structure is done by varying the dielectric constants and height of the substrate as well as gain and radiation pattern of the antenna is obtained. It observed that on varying the dielectric substrate the effect on proposed antenna is very effective.

scholarly journals NON-INTRUSIVE, VISUAL-LESS WEARABLE HAPTIC STIMULI NAVIGATIONAL ASSISTANCE FOR ELDERLY WITH DEMENTIA

2020 ◽  
Vol 20 (Special1) ◽  
pp. 128-137
Author(s):  
Rosalam CM ◽  
Faisul AA ◽  
Ruhaizin S ◽  
Khairul MK ◽  
Hassan A ◽  
...  
Keyword(s):  
Haptic Feedback ◽  
The Elderly ◽  
Navigation Systems ◽  
Test Results ◽  
Audio Signals ◽  
Haptic Modality ◽  
Potential Efficacy ◽  
Sensory Changes ◽  
Navigation Test ◽  
Signal Improvement

Age is typically affiliated with the decline of cognitive function and the probability to be diagnosed with neurodegenerative disease, namely dementia. Of all dementia-related deficits, the paper highlights on the decline of wayfinding ability, since it is interrelated with mobility, autonomy, caregiving burden and eventually institutionalization. The sense of directions in elderly is also affected by the sensory changes, while the most obvious sensory declines are both vision and hearing. Hence navigation systems that support mainly on visual and auditory may not be the best option for them. A concept of wearable navigational assistance that is non-intrusive and uses haptic stimuli instead of visual and/or audio signals is presented in this paper. A Usability Test (UT) was performed towards the elderly with dementia at a selected nursing home to investigate how they perceive haptic-feedback as a modality of navigation. The assessments involved three phases: (1) orientation or training, (2) navigation test and (3) further navigation test. Results indicate the potential efficacy of haptic modality as a navigation signal. Improvement on subjects’ navigational performance was shown especially during the further navigation test, signifying the familiarization of the intervention. Employing the haptic modality could be a beneficial substitute for navigational purpose when vision and audio are less appropriate. Nevertheless, as much as the encouraging outcomes from the results and analysis of the assessments are valuable, the constructive reviews attained are indeed important for the future development of the device system.

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