scholarly journals Microstrip Patch Strain Sensor Miniaturization Using Sierpinski Curve Fractal Geometry

Sensors ◽  
2019 ◽  
Vol 19 (18) ◽  
pp. 3989 ◽  
Author(s):  
Michal Herbko ◽  
Przemyslaw Lopato
Keyword(s):  
Resonant Frequency ◽  
Fractal Geometry ◽  
Strain Sensor ◽  
Frequency Shifts ◽  
Good Convergence ◽  
Microstrip Patch ◽  
Resonant Frequency Shift ◽  
Sierpiński Curve ◽  
Sierpinski Curve ◽  
Curve Geometry

In this paper miniaturization of a microstrip patch strain sensor (MPSS) using fractal geometry was proposed and analyzed. For this purpose, the transducer of Sierpinski curve geometry was utilized and compared with the most commonly utilized rectangular resonator-based one. Both sensors were designed for the same resonant frequency value (2.725 GHz). This fact allows analysis of the influence of the patch (resonator) shape and size on the resonant frequency shift. This is very important as the sensors with the same resonator shape but designed on various operating frequencies have various resonant frequency shifts. Simulation and experimental analysis for all sensors were carried out. A good convergence between results of simulation and measurements was achieved. The obtained results proved the possibility of microstrip strain sensor dimensions reduction using Sierpinski curve fractal geometry. Additionally, an influence of microstrip line deformation for proposed sensors was studied.

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 Structural Health Monitoring Sensor based on A Flexible Microstrip Patch Antenna

2018 ◽  
Vol 10 (3) ◽  
pp. 917 ◽  
Author(s):  
Hamse Abdillahi Haji Omer ◽  
Saidatul Norlyana Azemi ◽  
Azremi Abdullah Al-Hadi ◽  
Ping Jack Soh ◽  
Mohd Faizal Jamlos
Keyword(s):  
Structural Health Monitoring ◽  
Resonant Frequency ◽  
Health Monitoring ◽  
Patch Antenna ◽  
Strain Sensor ◽  
Microstrip Patch Antenna ◽  
Structural Health ◽  
Microstrip Patch ◽  
Potential Applications ◽  
Health Monitoring Systems

<span>A microstrip patch antenna strain sensor operating at dual frequencies 1.8GHz and 2.4GHz have been designed based on the relation between the resonant frequency and the strain applied to it. Felt substrate with a height of 3mm and dielectric constant of 1.44 and shield conductor are used for the design of this antenna. Testing results show that the resonant frequency of the microstrip patch antenna is 1.78 GHz and 2.4 GHz, which agrees with the simulation. The resonant frequency of the microstrip patch antenna increases linearly with the increase of the applied strain. This microstrip patch antenna strain sensor can be integrated with other components easily and have a great potential applications in structural health monitoring systems.</span>

scholarly journals Intercomparison of Methods for Determination of Resonant Frequency Shift of a Microstrip Patch Antenna Loaded with Hevea Rubber Latex

2014 ◽  
Vol 2014 ◽  
pp. 1-9 ◽  
Author(s):  
Nor Zakiah Yahaya ◽  
Zulkifly Abbas ◽  
Borhanuddin Mohd Ali ◽  
Alif Ismail ◽  
Farizah Ansarudin
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Moisture Content ◽  
Resonant Frequency ◽  
Frequency Shift ◽  
The Finite Element Method ◽  
Rubber Latex ◽  
Microstrip Patch ◽  
Resonant Frequency Shift ◽  
Element Method

This paper presents an intercomparison between the finite element method, method of moment, and the variational method to determine the effect of moisture content on the resonant frequency shift of a microstrip patch loaded with wet material. The samples selected for this study were Hevea rubber latex with different percentages of moisture content from 35% to 85%. The results were compared with the measurement data in the frequency range between 1 GHz and 4 GHz. It was found that the finite element method is the most accurate among all the three computational techniques with 0.1 mean error when compared to the measured resonant frequency shift. A calibration equation was obtained to predict moisture content from the measured frequency shift with an accuracy of 2%.

Air Gap Tuning Effect on the Resonant Frequency and Half-power Bandwidth of Superconducting Microstrip Patch

PIERS Online ◽  
2009 ◽  
Vol 5 (4) ◽  
pp. 350-354 ◽  
Author(s):  
Tarek Fortaki ◽  
Siham Benkouda ◽  
Mounir Amir ◽  
Abdelmadjid Benghalia
Keyword(s):  
Resonant Frequency ◽  
Air Gap ◽  
Microstrip Patch ◽  
Half Power

scholarly journals Patch antenna sensor for wireless ice and frost detection

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Ryan Kozak ◽  
Kasra Khorsand ◽  
Telnaz Zarifi ◽  
Kevin Golovin ◽  
Mohammad H. Zarifi
Keyword(s):  
Resonant Frequency ◽  
Patch Antenna ◽  
Wide Band ◽  
Power Lines ◽  
Ice Thickness ◽  
Ice Accretion ◽  
Robust Method ◽  
Frequency Shifts ◽  
Resonant Amplitude ◽  
Recorded Data

AbstractA patch antenna sensor with T-shaped slots operating at 2.378 GHz was developed and investigated for wireless ice and frost detection applications. Detection was performed by monitoring the resonant amplitude and resonant frequency of the transmission coefficient between the antenna sensor and a wide band receiver. This sensor was capable of distinguishing between frost, ice, and water with total shifts in resonant frequency of 32 MHz and 36 MHz in the presence of frost and ice, respectively, when compared to the bare sensor. Additionally, the antenna was sensitive to both ice thickness and the surface area covered in ice displaying resonant frequency shifts of 2 MHz and 8 MHz respectively between 80 and 160 μL of ice. By fitting an exponential function to the recorded data, the freezing rate was also extracted. The analysis within this work distinguishes the antenna sensor as a highly accurate and robust method for wireless ice accretion detection and monitoring. This technology has applications in a variety of industries including the energy sector for detection of ice on wind turbines and power lines.

scholarly journals Microwave Wireless Power Transfer System Based on a Frequency Reconfigurable Microstrip Patch Antenna Array

Energies ◽  
2021 ◽  
Vol 14 (2) ◽  
pp. 415
Author(s):  
Haiyue Wang ◽  
Lianwen Deng ◽  
Heng Luo ◽  
Junsa Du ◽  
Daohan Zhou ◽  
...  
Keyword(s):  
Resonant Frequency ◽  
Antenna Array ◽  
Patch Antenna ◽  
Wireless Power Transfer ◽  
Microstrip Patch Antenna ◽  
Market Demand ◽  
Power Transfer ◽  
Wireless Power ◽  
Microstrip Patch ◽  
Wide Range

The microwave wireless power transfer (MWPT) technology has found a variety of applications in consumer electronics, medical implants and sensor networks. Here, instead of a magnetic resonant coupling wireless power transfer (MRCWPT) system, a novel MWPT system based on a frequency reconfigurable (covering the S-band and C-band) microstrip patch antenna array is proposed for the first time. By switching the bias voltage-dependent capacitance value of the varactor diode between the larger main microstrip patch and the smaller side microstrip patch, the working frequency band of the MWPT system can be switched between the S-band and the C-band. Specifically, the operated frequencies of the antenna array vary continuously within a wide range from 3.41 to 3.96 GHz and 5.7 to 6.3 GHz. For the adjustable range of frequencies, the return loss of the antenna array is less than −15 dB at the resonant frequency. The gain of the frequency reconfigurable antenna array is above 6 dBi at different working frequencies. Simulation results verified by experimental results have shown that power transfer efficiency (PTE) of the MWPT system stays above 20% at different frequencies. Also, when the antenna array works at the resonant frequency of 3.64 GHz, the PTE of the MWPT system is 25%, 20.5%, and 10.3% at the distances of 20 mm, 40 mm, and 80 mm, respectively. The MWPT system can be used to power the receiver at different frequencies, which has great application prospects and market demand opportunities.

Thermo-optical switches using coated microsphere resonators

2001 ◽  
Vol 694 ◽  
Author(s):  
C. Tapalian ◽  
J.-P. Laine ◽  
P. A. Lane
Keyword(s):  
Resonant Frequency ◽  
Frequency Shift ◽  
Conjugated Polymer ◽  
Optical Switching ◽  
Optical Switches ◽  
Whispering Gallery Modes ◽  
Pump Light ◽  
Silica Microsphere ◽  
Frequency Shifts ◽  
Whispering Gallery

AbstractWe report optical switching by a silica microsphere optical resonator coated by a conjugated polymer. Microspheres were fabricated by melting the tip of an optical fiber and coated by dipping in a 1 mg/ml toluene solution of poly(2,5-dioctyloxy-1,4-phenylenevinylene) (DOO-PPV). The resonator properties were characterized by evanescently coupling 1.55 µm light propagating along a stripline-pedestal anti-resonant reflecting optical waveguide into optical whispering gallery modes (WGMs). WGM linewidths less than 2 MHz were measured, corresponding to cavity Q > 108. WGM resonant frequency shifts as large as 3.2 GHz were observed when 405 nm pump light with a power density of ~100 mW/cm2 was incident on the microsphere. The time constant of the observed frequency shifts is approximately 0.165 seconds, leading us to attribute the frequency shift to thermo-optic effects. Such a system should be capable of thermo-optically switching at speeds on the order of 10 kHz.

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