scholarly journals Design and parametric evaluation of UWB antenna for array arrangement

2019 ◽  
Vol 8 (2) ◽  
pp. 644-652 ◽  
Author(s):  
Faraz Ahmed Shaikh ◽  
Sheroz Khan ◽  
A H. M. Zahirul Alam ◽  
Dominique Baillargeat ◽  
Mohamed Hadi Habaebi ◽  
...  
Keyword(s):  
Structural Design ◽  
Simulation Software ◽  
Single Element ◽  
Frequency Range ◽  
Uwb Antenna ◽  
Laminate Material ◽  
Array Configuration ◽  
Simulation Results ◽  
Vivaldi Antenna ◽  
Better Than

This paper has introduced the concept of UWB antenna in array arrangements. The four elements of Balance Antipodal Vivaldi Antenna (BAVA) has been used for planar and H-plane array configuration in this research. Each single element of BAVA Antenna is printed on the glass-reinforced epoxy laminate material (FR4) along an overall thickness of 1.57mm and εr=4.3 respectively. The optimized measurement of each particular element is 60.75mm x 66mm approximatel. Further the parametric evaluation of four BAVA elements in different planes has been observed in this paper. The placement of array elements has almost coverd entire UWB frequency range and appropriate reflection coefficient which is better than -10dB has been established in both combinations. According to simulation results, the array elements in planar arrangement presenting a suitable reflection and works well at 3.2GHz frequency while the arrangement in H-plane the array elements works well at 7GHz of frequency. In planar arrangement, the operating frequency of antenna elements is shifting as results of the distance among inter elements which increase in wavelength. In H-plane arrangement an antenna elements generate additional gain up to 10.2 dB with good radiation patterns as compared to the planar plane. The CSTMWS simulation software has been used for antenna structural design and parametric verification.

Closed Loop Resonator Based Compact UWB Antenna with Single Notched Band Varying between WLAN and X-band for UWB Applications

Frequenz ◽  
2020 ◽  
Vol 74 (5-6) ◽  
pp. 201-209
Author(s):  
Mohammad Ahmad Salamin ◽  
Sudipta Das ◽  
Asmaa Zugari
Keyword(s):  
Closed Loop ◽  
Ground Plane ◽  
Frequency Range ◽  
Uwb Antenna ◽  
Notched Band ◽  
X Band ◽  
Compact Size ◽  
Simulation Results ◽  
Uwb Applications ◽  
Good Agreement

AbstractIn this paper, a novel compact UWB antenna with variable notched band characteristics for UWB applications is presented. The designed antenna primarily consists of an adjusted elliptical shaped metallic patch and a partial ground plane. The proposed antenna has a compact size of only 17 × 17 mm2. The suggested antenna covers the frequency range from 3.1 GHz to 12 GHz. A single notched band has been achieved at 7.4 GHz with the aid of integrating a novel closed loop resonator at the back plane of the antenna. This notched band can be utilized to alleviate the interference impact with the downlink X-band applications. Besides, a square slot was cut in the loop in order to obtain a variable notched band. With the absence and the existence of this slot, the notched band can be varied to mitigate interference of the upper WLAN band (5.72–5.82 GHz) and X-band (7.25–7.75 GHz) with UWB applications. A good agreement between measurement and simulation results was achieved, which affirms the appropriateness of this antenna for UWB applications.

scholarly journals Comparative Study between Planar and Bent Antenna Characterization

2018 ◽  
Vol 152 ◽  
pp. 03002
Author(s):  
Lau Zheng Tung ◽  
Ghafour Amouzed Mahdiraji ◽  
Lee Chia Ping
Keyword(s):  
Computer Simulation ◽  
Resonant Frequency ◽  
Navigation System ◽  
Comparative Evaluation ◽  
Impedance Matching ◽  
Simulation Software ◽  
Planar Antenna ◽  
Frequency Range ◽  
Uwb Antenna ◽  
Different Characteristics

Smaller designs of antenna usually implemented on Wi-Fi modules or navigation system devices which requires smaller bandwidth such as Planar Antenna. There are some antenna application requires bent antenna such as wearable UWB antenna but the substrate used will have some defects after bending and crumpling from time to time. What if the planar antenna is designed that it can be bent and the bending affects the impedance matching and shift in resonant frequency? So, this research aims to achieve the limitation of the planar antenna to be bent at certain angle and given frequency range (1-8 GHz). The planar antenna is designed in the Computer Simulation Technology (CST) Software and the proposed antenna is then bend in the simulation software. The analysis of comparative evaluation for both planar and bent antenna is carried out on different characteristics such as evaluation between S-Parameters & Frequency and evaluation between Voltage Standing Wavelength Ratio (VSWR) & Frequency. The behaviour of radiation pattern for both antennas can also be obtained in the CST simulation.

Design and Simulation of K Band RF MEMS Tunable Combline Filter

2014 ◽  
Vol 875-877 ◽  
pp. 2219-2223 ◽  
Author(s):  
Zhong Liang Deng ◽  
Xing Jie Cao
Keyword(s):  
Mobile Communication ◽  
Communication Systems ◽  
Bandpass Filter ◽  
Rf Mems ◽  
Bandpass Filters ◽  
Simulation Software ◽  
Frequency Range ◽  
Mobile Communication Systems ◽  
Simulation Results ◽  
Tunable Frequency

Tunable bandpass filters are generally preferred and are used extensively in the mobile communication systems. In this paper, a design of the RF MEMS tunable combline bandpass filter is proposed. Firstly, the theory of the RF MEMS tunable combline bandpass filter is presented. Secondly, a combline bandpass filter which have a tunable frequency range from 18GHz to 27GHz is designed and simulated by using the EDA simulation software. Its bandwidth is about 1GHz in the tunable frequency range. From the simulation results, the designed filter is not only compact and effortless to fabricate but also relatively superior in some aspects.

scholarly journals Recognition of Metal Objects inside Wall using Antipodal Vivaldi Antenna

2018 ◽  
Vol 11 (1) ◽  
pp. 27 ◽  
Author(s):  
Faraz Ahmed Shaikh ◽  
Sheroz Khan ◽  
Zarimin Zaharudin ◽  
AHM Zahirul Alam ◽  
Farah Diyana Bt. Abdul Rahman ◽  
...  
Keyword(s):  
Detection System ◽  
Wide Band ◽  
Simulation Software ◽  
Uwb Antenna ◽  
Working Mechanism ◽  
Design And Optimization ◽  
Vivaldi Antenna ◽  
Inside Wall ◽  
Recognition Technique ◽  
Wall Imaging

This paper present a recognition technique of metal placed inside and between two walls. A unique scheme of recognition of metallic objects through Ultra Wide Band (UWB) Modified Antipodal Vivaldi Antenna (MAVA) frequency range of (3.1GHz to 10.6 GHz) is presented in this paper.The working mechanism of detection system based on Time Domain Reflectrometry (TDR) using through wall imaging (TWMI). A very small duration pulses generated by Vector Network Analyzer (VNA) which are used for illuminate the wall.The analysis of a system under UWB antenna probe array. The simulation results of MAVA have given an enormous potential of penetration, in order to recognize concealed metal objects with fine precision, proving a smart development in the detection system technology. The improvement of resolution in an image, special filters have been developed and implemented. The design and optimization progression is conceded out via CST simulation software for parametric performance assessment of return loss, radiation pattern and directivity.

scholarly journals Design and Performance of UWB Wide Slot Antenna to Detect the Breast Cancer in Women

2019 ◽  
Vol 8 (6) ◽  
pp. 3956-3963
Keyword(s):  
Breast Cancer ◽  
Patch Antenna ◽  
Normal Tissue ◽  
Specific Absorption Rate ◽  
Slot Antenna ◽  
Frequency Range ◽  
Uwb Antenna ◽  
And Performance ◽  
Stacked Patch Antenna ◽  
Better Than

Breast cancer is one of the fatal diseases that greatly contribute to the death of many women across the nations. Basically, breast cancer can be detected using a wide slot UWB antenna. In this paper the performance of both antennas like wide slot and stacked patch are used to compare the detection of breast cancer. The specific absorption rate of both antennas is calculated in a normal tissue and tumors tissue, the result is contrast. From this comparative study it’s clear that wide slot UWB antenna has outstanding performance in this UWB frequency range and the size of the antenna is three times smaller when compared to the size of the stacked patch antenna. The performances of both the antennas were analyzed and the result suggests that the wide slot antenna performs better than the further antenna.

scholarly journals Joint Estimation of DOA and Polarization with CLD Pair Cylindrical Array Based on Quaternion Model

2014 ◽  
Vol 2014 ◽  
pp. 1-7
Author(s):  
Guibao Wang ◽  
Haihong Tao ◽  
Lanmei Wang ◽  
Cao Zeng
Keyword(s):  
Closed Form ◽  
Joint Estimation ◽  
Eigenvalue Decomposition ◽  
Vector Method ◽  
Array Configuration ◽  
Conformal Array ◽  
Simulation Results ◽  
Esprit Algorithm ◽  
Cylindrical Array ◽  
Better Than

This paper proposes a quaternion-ESPRIT algorithm for closed-form estimation of direction of arrival (DOA) and polarization, using a cylindrical conformal array configuration. First, the array steering vector and the elevation are estimated using a quaternion eigenvalue decomposition of the data covariance matrix. Second, the azimuth is estimated. Finally, the polarization parameters are estimated using the relationships between the dipoles and the loops. These estimates are automatically matched. Simulation results show that the performance of quaternion method is obviously better than that of the long-vector method.

scholarly journals Design an Ultra- Wideband Modified Wilkinson Power Divider Fed-by Balanced Antipodal Vivaldi Antenna Array for Imaging Applications

2019 ◽  
Vol 9 (2) ◽  
pp. 4236-4241
Keyword(s):  
Low Cost ◽  
Impedance Matching ◽  
Simulation Software ◽  
Ultra Wideband ◽  
Power Divider ◽  
Power Splitting ◽  
Frequency Range ◽  
Radial Stub ◽  
Vivaldi Antenna ◽  
Wilkinson Power Divider

In this paper, design of compactand modified geometrical structure of 1-to-4 way ultra-wideband Wilkinson power divider used as a feeding network for 4-element of balanced antipodal Vivaldi antenna (BAVA) array has introduced. The proposed Wilkinson power divider has been designed and printed on low-cost Epoxy laminate substrate FR4 along with the thickness of 1.6mm and relative permittivity of ɛr =4.3 respectively. The transformation of power divider network which are based on bent corners as a replacement of sharp corners or edges used for the decrement in unintended radiation and employing a single radial stub on each branch to encounter the antenna-specifications. Further some adjustments in the dimension of stubs matching in order to increase the reflection of the power divider network. The design presents the model of a power divider and maintains an equal power splitting at different ports with practical insertion loss and conventional return loss below -10dB. The reasonable impedance matching has achieved at every single port with acceptable isolation performance values over the (3-to-10 GHz) frequency range. The divider as well as antenna elements design and its optimization are practicable via computer simulation technology (CST) simulation software. The experimental results are revealed to encounter the arrayspecifications under ultra-wideband frequency range..

Silicon Micromachined Ultrasonic Transducers

2000 ◽  
Author(s):  
Butrus T. Khuri-Yakub ◽  
Ching-Hsiang Cheng ◽  
Fahrettin-Levent Degertekin ◽  
Sanli Ergun ◽  
Sean Hansen ◽  
...  
Keyword(s):  
Integrated Circuit ◽  
Dynamic Range ◽  
Piezoelectric Transducers ◽  
Ultrasonic Transducers ◽  
Single Element ◽  
Frequency Range ◽  
Integrated Circuit Manufacturing ◽  
Ultrasound Applications ◽  
Better Than ◽  
Airborne Ultrasound

Abstract This paper reviews capacitor micromachined ultrasonic transducers (cMUTs). Transducers for air-borne and immersion applications are made from parallel-plate capacitors whose dimensions are controlled through traditional integrated circuit manufacturing methods. Transducers for airborne ultrasound applications have been operated in the frequency range of 0.1–11 MHz, while immersion transducers have been operated in the frequency range of 1–20 MHz. The Mason model is used to represent the cMUT and highlight the important parameters in the design of both airborne and immersion transducers. Theory is used to compare the dynamic range and the bandwidth of the cMUTs to piezoelectric transducers. It is seen that cMUTs perform at least as well if not better than piezoelectric transducers. Examples of single-element transducers, linear-array transducers, and two-dimensional arrays of transducers will be presented.

scholarly journals Simulation and Nonlinearity Optimization of a High-Pressure Sensor

Sensors ◽  
2020 ◽  
Vol 20 (16) ◽  
pp. 4419
Author(s):  
Ting Li ◽  
Haiping Shang ◽  
Weibing Wang
Keyword(s):  
High Pressure ◽  
Pressure Sensor ◽  
Pressure Sensors ◽  
Original Model ◽  
Ansys Software ◽  
Nonlinear Error ◽  
Sensor Model ◽  
Optimized Model ◽  
Simulation Results ◽  
Better Than

A pressure sensor in the range of 0–120 MPa with a square diaphragm was designed and fabricated, which was isolated by the oil-filled package. The nonlinearity of the device without circuit compensation is better than 0.4%, and the accuracy is 0.43%. This sensor model was simulated by ANSYS software. Based on this model, we simulated the output voltage and nonlinearity when piezoresistors locations change. The simulation results showed that as the stress of the longitudinal resistor (RL) was increased compared to the transverse resistor (RT), the nonlinear error of the pressure sensor would first decrease to about 0 and then increase. The theoretical calculation and mathematical fitting were given to this phenomenon. Based on this discovery, a method for optimizing the nonlinearity of high-pressure sensors while ensuring the maximum sensitivity was proposed. In the simulation, the output of the optimized model had a significant improvement over the original model, and the nonlinear error significantly decreased from 0.106% to 0.0000713%.

scholarly journals Injection-rolling nozzle in an imprint system with continuous injection direct rolling for ultra-thin microstructure guide light plate

2021 ◽  
Vol 13 (4) ◽  
pp. 168781402110112
Author(s):  
Yan Lou ◽  
Kewei Chen ◽  
Xiangwei Zhou ◽  
Yanfeng Feng
Keyword(s):  
Flow Velocity ◽  
Superior Performance ◽  
Light Transmittance ◽  
Velocity Difference ◽  
Orthogonal Experiments ◽  
Width Direction ◽  
Direct Rolling ◽  
Simulation Results ◽  
Continuous Injection ◽  
Better Than

A novel Injection-rolling Nozzle (IRN) in an imprint system with continuous injection direct rolling (CIDR) for ultra-thin microstructure polymer guide light plates was developed to achieve uniform flow velocity and temperature at the width direction of the cavity exit. A novel IRN cavity was designed. There are eight of feature parameters of cavity were optimized by orthogonal experiments and numerical simulation. Results show that the flow velocity at the width direction of the IRN outlet can reach uniformity, which is far better than that of traditional cavity. The smallest flow velocity difference and temperature difference was 0.6 mm/s and 0.24 K, respectively. The superior performance of the IRN was verified through a CIDR experiment. Several 0.35-mm thick, 340-mm wide, and 10-m long microstructural Polymethyl Methacrylate (PMMA) guide light plates were manufactured. The average filling rates of the microgrooves with the aspect ratio 1:3 reached above 93%. The average light transmittance is 88%.

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