scholarly journals A Capacitively-Fed Inverted-F Antenna for Displacement Detection in Structural Health Monitoring

Sensors ◽  
2020 ◽  
Vol 20 (18) ◽  
pp. 5310
Author(s):  
Songtao Xue ◽  
Zhiquan Zheng ◽  
Shuai Guan ◽  
Liyu Xie ◽  
Guochun Wan ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Resonant Frequency ◽  
Current Distribution ◽  
Health Monitoring ◽  
High Frequency ◽  
Relative Displacement ◽  
Displacement Sensor ◽  
First Order ◽  
High Frequency Structure Simulator ◽  
Dimensional Parameters

This paper presents a capacitive displacement sensor based on a capacitively fed inverted-F antenna (CFIFA) for displacement detection. The sensor is composed of a grounded L-shape patch and a rectangular upper patch, forming a capacitor between them. The asymmetric dipole model is adopted to explain the frequency shift and current distribution of the proposed antenna sensor at its first-order resonance. The numerical simulation of the CFIFA using the Ansoft high-frequency structure simulator (HFSS) software is carried out to optimize the dimensional parameters, allowing the antenna to perform better. Two sets of CFIFAs are fabricated and tested for verification. Results show that the CFIFA has a good linear relationship between its first resonant frequency and the relative displacement, and is capable of a long range of displacement measuring.

scholarly journals A Displacement Sensor Based on a Normal Mode Helical Antenna

Sensors ◽  
2019 ◽  
Vol 19 (17) ◽  
pp. 3767 ◽  
Author(s):  
Xue ◽  
Yi ◽  
Xie ◽  
Wan ◽  
Ding
Keyword(s):  
Resonant Frequency ◽  
Normal Mode ◽  
High Frequency ◽  
Displacement Sensor ◽  
Helical Antenna ◽  
Frequency Shifts ◽  
High Frequency Structure Simulator ◽  
Resonant Frequency Shift ◽  
Gradient Change ◽  
Applied Displacement

This paper presents a passive displacement sensor based on a normal mode helical antenna. The sensor consists of an external helical antenna and an inserting dielectric rod. First, the perturbation theory is adopted to demonstrate that both the electric intensity and magnetic intensity have a noticeable gradient change within the in-and-out entrance of the helical antenna, which will cause the sensor to experience a resonant frequency shift. This phenomenon was further verified by numerical simulation using the Ansoft high frequency structure simulator (HFSS), and results show the linear correlation between the retrieved resonant frequency and the displacement. Two sets of proposed sensors were fabricated. The experiments validated that the resonant frequency shifts are linearly proportional to the applied displacement, and the sensing range can be adjusted to accommodate the user’s needs.

scholarly journals A Square Patch with L and Inverted L shaped slotted AMC structure for Wi-Fi Applications

2020 ◽  
Vol 9 (1) ◽  
pp. 1722-1725
Keyword(s):  
Resonant Frequency ◽  
Patch Antenna ◽  
High Frequency ◽  
Return Loss ◽  
Band Width ◽  
Magnetic Conductor ◽  
Radiation Characteristics ◽  
Artificial Magnetic Conductor ◽  
High Frequency Structure Simulator ◽  
Phase Reflection

To improve the antenna characteristics in terms of bandwidth, gain and its radiation characteristics without providing any phase reflections, Artificial Magnetic Conductor (AMC) are used in antenna designing. This paper initially designed AMC structure for 2.4GHz frequency. The proposed AMC structure consists of three L shaped and inverted L shaped slots and provides zero degrees phase reflection at 2.4GHz resonant frequency. This proposed AMC structure is incorporated on conventional micro strip square patch antenna and results are simulated in High Frequency Structure Simulator (HFSS) software. The Proposed AMC incorporated patch antenna, return loss is improved from -16.16dB to -31.75dB, VSWR is from 1.42 to 1.05, the band width is increased from 16.5 MHz to 348.1 MHz This design resonates at a frequency of 2.4GHz and applicable to Wi-Fi applications.

scholarly journals Long-Range Displacement Meters Based on Chipped Circular Patch Antenna

Sensors ◽  
2020 ◽  
Vol 20 (17) ◽  
pp. 4884
Author(s):  
Songtao Xue ◽  
Kang Jiang ◽  
Shuai Guan ◽  
Liyu Xie ◽  
Guochun Wan ◽  
...  
Keyword(s):  
Long Range ◽  
Patch Antenna ◽  
High Frequency ◽  
Current Flow ◽  
Displacement Sensor ◽  
Circular Patch ◽  
High Frequency Structure Simulator ◽  
Circular Patch Antenna ◽  
Ground Plate ◽  
Stress Damage

This paper presents a passive wireless long-range displacement sensor that is based on the circular patch antenna, and the detecting range of the sensor can be customized. The sensor consists of a chipped circular antenna with two opened rectangular windows, a substrate, and a ground plate with a sloping channel. No bonding between the antenna and the ground plate allows for the chipped antenna to slide along the sloping channel. The channel will drive the current flow on the plate once the chip is activated, increasing the effective electrical length and, consequently, decreasing the resonant frequency of the circular antenna. The sensing mechanism equates the measuring displacement to the relative movement of the antenna with respect to the ground that achieves the measurement of long-range displacement and, thus, the proposed sensor can avoid stress damage to the antenna due to excessive deformation. Three different range sensors were simulated in the the Ansoft high frequency structure simulator (HFSS). The results show that the resonance frequency of the antenna has a linear relationship with the varying chute depth beneath the chip. Three sensors were fabricated, and the experimental results also validated that the sensitivity of the sensor can be adjusted.

THE EFFECTS OF STRUCTURAL-INDUCED DEFORMATION ON THE RESONANCE OF PATCH ANTENNAS

2021 ◽  
Author(s):  
KELVIN NICHOLSON ◽  
JOHN WANG ◽  
ROWAN HEALEY ◽  
TAYLOR LYNCH ◽  
JOEL PATNIOTIS ◽  
...  
Keyword(s):  
Resonant Frequency ◽  
Patch Antenna ◽  
High Frequency ◽  
Aerodynamic Performance ◽  
Patch Antennas ◽  
Direct Integration ◽  
Structural Efficiency ◽  
High Frequency Structure Simulator ◽  
Resonant Behavior ◽  
Structural Loading

Conformal Loadbearing Antenna Structures (CLAS) take advantage of a combination of structural and electromagnetic functions. CLAS have been developed as an advanced replacement for conventional antennas (such as blades, wires and dishes) to improve the structural efficiency, as well as the electromagnetic and aerodynamic performance of a platform. The CLAS concept permits the direct integration of microwave radiating elements in the structural skin of a platform. Therefore, the antenna will be subjected to structural loading and will deform accordingly. The effects of these structural-induced deformations on the resonant frequency of the antenna will be reported in this paper. This paper will investigate the performance of a carbon veil patch antenna when it is subject to static in-plane. The work presented will include the effects of in-plane loading on the resonant behavior of the patch antenna when the carbon veil is fully bonded and when it is disbonded by the parent structure. This paper will also discuss the effects of substrate delamination on the RF response of the patch antenna. The RF characteristics of the antenna will be modelled using ANSYS High Frequency Structure Simulator (HFSS).

Study on Electronic Materials with Performance of Meander-Line Inverted-F Antenna

2014 ◽  
Vol 886 ◽  
pp. 386-389
Author(s):  
Jing Wei Wu ◽  
Wei He ◽  
Dan Su ◽  
Jing Mo
Keyword(s):  
Resonant Frequency ◽  
High Frequency ◽  
Electronic Materials ◽  
Performance Parameters ◽  
Resonance Point ◽  
Frequency Resonance ◽  
High Frequency Structure Simulator ◽  
Frequency Structure ◽  
Meander Line ◽  
Meander Lines

Inverted-F antenna loaded meander-line was studied by using High Frequency Structure Simulator V11(hereinafter referred to as HFSS V11). Research had focused on main performance parameters of Inverted-F antenna which loaded different number of meander-lines and different height of meander-lines. According to research, main performance parameters of inverted-F antenna, such as resonant frequency, resonance impedance and S11 parameter of resonance point could be adjusted effectively. Inverted-F antenna could be miniaturized effectively by selecting appropriate number and height of meander-lines. The technology of loaded meander-line is a kind of simple and effective way that can be applied to the RFID field and other areas that have high requirements for miniaturization of antenna.

scholarly journals Couplinator: A simple computational tool for synthesis of multi-section coupled-line filter based on MPCM-TLM technique

2021 ◽  
pp. 1-10
Author(s):  
E. Faghand ◽  
S. Karimian ◽  
E. Mehrshahi ◽  
N. Karimian
Keyword(s):  
Comparative Analysis ◽  
Transmission Line ◽  
High Frequency ◽  
Computational Tool ◽  
Cad Tools ◽  
Coupled Line ◽  
High Frequency Structure Simulator ◽  
Transmission Line Method ◽  
Set Up ◽  
Planar Circuit

Abstract A new simple computational tool is proposed for the synthesis of multi-section coupled-line filters based on combined modified planar circuit method (MPCM) and transmission line method (TLM) analysis, referred to as MPCM-TLM. Due to its fundamentally simple architecture, the presented tool offers significantly faster optimization of coupled-line filters – for exactly the same initial simulation set-up – than other costly commercially-available tools, giving equally reliable results. Validity and accuracy of the proposed tool have been verified through the design of 3rd, 5th, and 7th order coupled-line filters and comparative analysis between results obtained from the proposed approach and the high-frequency structure simulator. A remarkable 99% time reduction in the analysis is recorded in the case of 7th order filter using the proposed tool, for almost identical results to HFSS. Therefore, it can be confidently claimed that the proposed technique can be used as a reliable alternative to existing complex, costly, processor-intensive CAD tools.

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