scholarly journals Antipodal Vivaldi Antenna for Water Pipe Sensor and Telemetry

2012 ◽  
Vol 2012 ◽  
pp. 1-8 ◽  
Author(s):  
Giuseppe Ruvio ◽  
Domenico Gaetano ◽  
Max J. Ammann ◽  
Patrick McEvoy
Keyword(s):  
Remote Monitoring ◽  
Figure Of Merit ◽  
Dynamic Range ◽  
Impedance Matching ◽  
Water Levels ◽  
Radiation Efficiency ◽  
Ultra Wideband ◽  
Water Pipe ◽  
Antenna Impedance ◽  
Vivaldi Antenna

An antipodal Vivaldi antenna operates simultaneously for telemetry and sensing when placed conformally onto PVC pipes. Good radiation efficiency is realised and the antenna impedance matching remains stable when a pipe is empty or contains water. The fidelity factor performance based on an input Ultra-Wideband Gaussian pulse is a suitable figure of merit to detect water presence. Different water levels and pipe conditions correspond to fidelity factors between 90% and 96%, which are a suitable dynamic range for sensing and the appropriate quality for pulse communications for remote monitoring.

Improved Characteristics of Antipodal Vivaldi Antenna for UWBRADAR Applications

2019 ◽  
Vol 9 (2) ◽  
pp. 287-294
Author(s):  
Djalal Ziani Kerarti ◽  
Fatima Zahra Marouf
Keyword(s):  
Return Loss ◽  
Impedance Matching ◽  
Ultra Wideband ◽  
Simple Design ◽  
Compact Dimension ◽  
Radar Applications ◽  
Flat Gain ◽  
Vivaldi Antenna ◽  
Wideband Radar ◽  
Improved Characteristics

Background & Objective: In this paper, a simple design of antipodal Vivaldi antenna for ultra-wideband Radar applications is presented. Methods: The antenna provided to operate across the entire UWB spectrum sins it covers a very wide frequency band from 2.43 up to 13 GHz with better return loss characteristics. In addition, the antenna offers high and flat gain in this band. The numerical designs of the antennas have been performed by using the commercially available software CST MW, which it’s printed on Taconic substrate with a dielectric constant of 4.5 and thickness 1.6 mm. Results and Conclusion: The antenna has a compact dimension of 40 × 50 mm2 achieve satisfactory impedance matching and radiation efficiency.

scholarly journals Many-Objective Automated Optimization of a Four-Band Antenna for Multiband Wireless Sensor Networks

Sensors ◽  
2018 ◽  
Vol 18 (10) ◽  
pp. 3309 ◽  
Author(s):  
Łukasz Januszkiewicz ◽  
Paolo Di Barba ◽  
Łukasz Jopek ◽  
Sławomir Hausman
Keyword(s):  
Wireless Sensor Networks ◽  
Sensor Networks ◽  
Impedance Matching ◽  
Radiation Efficiency ◽  
Ultra Wideband ◽  
Wireless Sensor ◽  
Initial Design ◽  
Antenna Performance ◽  
Final Design ◽  
Automated Optimization

This paper describes a new design and an optimization framework for a four-band antenna to be used in wireless sensor networks. The antenna is designed to operate effectively in two open frequency bands (ISM—Industrial, Scientific, Medical), 2.4 GHz and 5.8 GHz, as well as in two bands allocated for the fifth-generation (5G) cellular networks, 0.7 GHz and 3.5 GHz. Our initial design was developed using the trial and error approach, modifying a circular disc monopole antenna widely used in ultra wideband (UWB) systems. This initial design covered the three upper bands, but impedance matching within the 700 MHz band was unsatisfactory. The antenna performance was then improved significantly using an optimization algorithm that applies a bi-objective fully-Paretian approach to its nine-parameter geometry. The optimization criteria were impedance matching and radiation efficiency. The final design exhibits good impedance matching in all four desired bands with the Voltage Standing Wave Ratio (VSWR) value below 2 and radiation efficiency of 88%. The simulated antenna performance was verified experimentally.

scholarly journals Compact Dual-Polarized Vivaldi Antenna with High Gain and High Polarization Purity for GPR Applications

Sensors ◽  
2021 ◽  
Vol 21 (2) ◽  
pp. 503
Author(s):  
Hai-Han Sun ◽  
Yee Hui Lee ◽  
Wenhao Luo ◽  
Lai Fern Ow ◽  
Mohamed Lokman Mohd Yusof ◽  
...  
Keyword(s):  
Impedance Matching ◽  
High Gain ◽  
Ultra Wideband ◽  
Compact Antenna ◽  
Oblique Position ◽  
Vivaldi Antenna ◽  
Dual Polarized ◽  
Ground Penetrating ◽  
Low Dispersion ◽  
Polarized Radiation

A compact ultra-wideband dual-polarized Vivaldi antenna is proposed for full polarimetric ground-penetrating radar (GPR) applications. A shared-aperture configuration comprising four Vivaldi elements for orthogonal polarizations is designed to reduce the low-end operating frequency and improve the port isolation with a compact antenna size. The directivity of the antenna is enhanced by the oblique position of the radiators and the implementation of a square loop reflector. Experimental results demonstrate that the antenna has very good impedance matching, port isolation, and dual-polarized radiation performance, with low dispersion characteristics across band of interest from 0.4 GHz to 3.0 GHz. GPR measurements with the designed antenna show that the antenna maintains good detection capability even for objects buried in a highly conductive soil.

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..

Selectivity and in-band impedance enhancement of a compact slot antenna with defected ground structures

2019 ◽  
Vol 11 (10) ◽  
pp. 1010-1016
Author(s):  
Hailong Yang ◽  
Xiaoli Xi ◽  
Lili Wang ◽  
Yuchen Zhao ◽  
Xiaomin Shi
Keyword(s):  
Reflection Coefficient ◽  
Impedance Matching ◽  
Ultra Wideband ◽  
Band Edge ◽  
Slot Antenna ◽  
Defected Ground Structure ◽  
Pass Filter ◽  
Low Pass Filter ◽  
Uwb Antennas ◽  
Low Pass

AbstractIn this study, a new ultra-wideband (UWB) band-edge selectivity antenna with a modified radiation slot using defected ground structure (DGS) is presented to obtain bandpass filtering reflection coefficient and gain performance. The well-designed DGS is designed on backside metallic of the substrate and can be seen as a low-pass filter that provides a good roll-off at a higher frequency. By connecting the DGS and the stepped slot and making them merge with each other, good cut-off property in the upper passband and better in-band impedance characteristics are obtained. Measured results show that the proposed design not only shows good band-edge selectivity in reflection coefficient and gain performance but also has a good impedance matching of −13.5 dB reflection coefficients and a good radiation efficiency of 90% in the operating frequencies. The measured bandwidth defined with the reflection coefficient less than −10 dB is from 3.1–11.2 GHz. Furthermore, the size of the filtering UWB antenna is 22 mm × 12 mm, which is smaller than many individual UWB antennas and UWB filters.

Modified antipodal Vivaldi antenna for ultra‐wideband communications

2016 ◽  
Vol 10 (4) ◽  
pp. 401-405 ◽  
Author(s):  
Rajesh Natarajan ◽  
Jithila V. George ◽  
Malathi Kanagasabai ◽  
Livya Lawrance ◽  
Balaji Moorthy ◽  
...  
Keyword(s):  
Ultra Wideband ◽  
Wideband Communications ◽  
Vivaldi Antenna

scholarly journals Compact Liquid Crystal Based Tunable Band-Stop Filter with an Ultra-Wide Stopband by Using Wave Interference Technique

2017 ◽  
Vol 2017 ◽  
pp. 1-11 ◽  
Author(s):  
Longzhu Cai ◽  
Huan Xu ◽  
Daping Chu
Keyword(s):  
Liquid Crystal ◽  
Impedance Matching ◽  
Wide Frequency Range ◽  
Ultra Wideband ◽  
New Wave ◽  
Wave Interference ◽  
Rejection Level ◽  
Band Stop Filter ◽  
The Individual ◽  
Uwb Applications

A wave interference filtering section that consists of three stubs of different lengths, each with an individual stopband of its own central frequency, is reported here for the design of band-stop filters (BSFs) with ultra-wide and sharp stopbands as well as large attenuation characteristics. The superposition of the individual stopbands provides the coverage over an ultra-wide frequency range. Equations and guidelines are presented for the application of a new wave interference technique to adjust the rejection level and width of its stopband. Based on that, an electrically tunable ultra-wide stopband BSF using a liquid crystal (LC) material for ultra-wideband (UWB) applications is designed. Careful treatment of the bent stubs, including impedance matching of the main microstrip line and bent stubs together with that of the SMA connectors and impedance adaptors, was carried out for the compactness and minimum insertion and reflection losses. The experimental results of the fabricated device agree very well with that of the simulation. The centre rejection frequency as measured can be tuned between 4.434 and 4.814 GHz when a biased voltage of 0–20 Vrms is used. The 3 dB and 25 dB stopband bandwidths were 4.86 GHz and 2.51 GHz, respectively, which are larger than that of other recently reported LC based tunable BSFs.

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