A fully-textile wideband AMC-backed antenna for wristband WiMAX and medical applications

2020 ◽  
pp. 1-10
Author(s):  
Mohamed El Atrash ◽  
Mahmoud A. Abdalla ◽  
Hadia M. Elhennawy
Keyword(s):  
Frequency Band ◽  
Integrated Design ◽  
Antenna Design ◽  
Human Model ◽  
Total Efficiency ◽  
Magnetic Conductor ◽  
Textile Materials ◽  
Low Profile ◽  
Measurement Results ◽  
Integrated Antenna

Abstract Proposed is a wideband, low profile, fully flexible, and all-textile-based slotted triangular antenna loaded with a 2 × 2 textile-inspired artificial magnetic conductor to be worn on the wrist. The integrated antenna design is designed to cover the frequency band from 3.1 to 6.5 GHz. The integrated design has two main resonances, where the first one is at 3.5 GHz, which can serve the WiMAX communication standard, while the second is at 5.8 GHz, which can serve the Industrial, Scientific and Medical (ISM)-band. The incorporated textile materials are composed of the conductive and dielectric fabrics that are realized by ShieldIt and Felt, respectively. When simulated against the human model wrist, the integrated antenna design displayed a realized gain of 6.71 dBi and radiation efficiency of 79.1%, at 3.5 GHz. Furthermore, at 5.8 GHz, it displayed a realized gain of 7.82 dBi and total efficiency performances of 66.1%. Moreover, it accomplished very low SAR levels within the antenna frequency band. Averaged over 1 g of tissue, it exhibited maximum SAR levels of 3.28 × 10−6 and 9.37 × 10−7 W/kg at 3.5 and 5.8 GHz, respectively. For the bent scenarios, the integrated antenna design displayed robustness when bent at an angle of 20 and 40°. Finally, measurement results are illustrated and analyzed. Based on the presented results, the suggested all-textile integrated antenna design might be designated for integration with the wristband to monitor the user health conditions through many possible frequency channels.

scholarly journals Compact Differential-Fed Planar Filtering Antennas

Electronics ◽  
2019 ◽  
Vol 8 (11) ◽  
pp. 1241
Author(s):  
Emadeldeen Hassan ◽  
Denys Martynenko ◽  
Eddie Wadbro ◽  
Gunter Fischer ◽  
Martin Berggren
Keyword(s):  
Frequency Band ◽  
Optimization Problem ◽  
Impedance Bandwidth ◽  
Cross Polarization ◽  
Planar Antennas ◽  
Good Match ◽  
Topology Optimization Problem ◽  
Low Profile ◽  
X Band ◽  
Measurement Results

This paper proposes novel low-profile differential-fed planar antennas with embedded sharp frequency selectively. The antennas are compact and easy to integrate with differential devices without matching baluns. The antenna design is formulated as a topology optimization problem, where requirements on impedance bandwidth, directivity, and filtering are used as the design objectives. The optimized antennas operate over the frequency band 6.0–8.5 GHz. The antennas have reflection coefficients below −15 dB, cross-polarization levels below −42 dB, a maximum gain of 6.0 ± 0.5 dB, and a uniform directivity over more than 130° beamwidth angle in the frequency band of interest. In addition, the antennas exhibit sharp roll-off between the operational band and frequencies around the 5.8 GHz WiFi band and the 10 GHz X-band. One antenna has been fabricated with a good match between simulation and measurement results.

scholarly journals A Low Profile Wideband Log Periodic Microstrip Antenna Design for C-Band Applications

2019 ◽  
Vol 8 (2) ◽  
pp. 48-52 ◽  
Author(s):  
M. Yerlikaya ◽  
S. S. Gültekin ◽  
D. Uzer
Keyword(s):  
Dielectric Constant ◽  
Microstrip Antenna ◽  
Microstrip Line ◽  
Ground Plane ◽  
Antenna Design ◽  
Tangent Loss ◽  
Low Profile ◽  
Measurement Results ◽  
Simulation Results ◽  
5 Ghz

In this study, a wideband low profile microstrip antenna design for C-band applications is presented. The proposed antenna consists of a monopol log periodic patch in the equilateral triangular dimensions with the microstrip line fed and a rectangular ground plane. The antenna has 9×19.8 mm2 overall size, thickness of 1.6 mm and 4.3 dielectric constant. According to the simulation results, the proposed antenna has a very wide bandwidth while operating in the frequency band of 4.25-7.95 GHz and 5 GHz resonance frequency. The proposed antenna was also prototyped on FR4 substrate with the 0.02 tangent loss and the measurement results were quite similar by the simulated results.

scholarly journals FULLY TRANSPARENT METAMATERIAL AMC BACKED CPW FED MONOPOLE ANTENNA FOR IOT APPLICATIONS

2021 ◽  
Vol 59 (5) ◽  
Author(s):  
Cong Danh Bui ◽  
Arpan Desai ◽  
Thi Thanh Kieu Nguyen ◽  
Truong Khang Nguyen
Keyword(s):  
Planar Waveguide ◽  
Monopole Antenna ◽  
Antenna Design ◽  
Impedance Bandwidth ◽  
Magnetic Conductor ◽  
Iot Applications ◽  
Antenna Performance ◽  
Measurement Results ◽  
Conductive Oxide ◽  
Peak Gain

In this paper, a fully transparent antenna comprising of an Artificial Magnetic Conductor (AMC) backed Co-planar Waveguide (CPW) fed dual-ring monopole is presented. The monopole antenna and AMC structure achieve transparency due to the use of AgHT-8 conductive oxide and Plexiglas substrate. Measured antenna performance shows an impedance bandwidth of 5.3 – 6 GHz (12.4%) in the U-NII-1 to U-NII-4 frequency band with a peak gain of 5.7 dBi which is approximately an increase of 4.5% and 3.9 dBi, respectively, as compared to the standalone antenna. The simulation and the measurement results agree well with each other which proves the validity of the proposed design. To the best of our knowledge, the proposed antenna is the first fully transparent antenna design combining a transparent radiator and a transparent AMC structure.

scholarly journals A New Design of a CPW-Fed Dual-Band Monopole Antenna for RFID Readers

2018 ◽  
Vol 8 (2) ◽  
pp. 1040
Author(s):  
Ahmed El Hamraoui ◽  
EL Hassane Abdelmounim ◽  
Jamal Zbitou ◽  
Hamid Bennis ◽  
Mohamed Latrach
Keyword(s):  
Low Cost ◽  
Coplanar Waveguide ◽  
Monopole Antenna ◽  
Antenna Design ◽  
Dual Band ◽  
Critical Parameters ◽  
Antenna Structure ◽  
Low Profile ◽  
Measurement Results ◽  
Rfid Readers

<p>This paper comes with a new dual-band planar monopole antenna fed by Coplanar Waveguide (CPW) line designed for RFID readers and it operates at 2.45 GHz, 5.80 GHz. This antenna is designed with reasonable gain, low profile and low cost production. The designed antenna based on theoretical equations is simulated and validated by using ADS from Agilent technologies and CST Microwave Studio electromagnetic solvers. A parametric study of the proposed antenna has been carried out by optimizing some critical parameters. The antenna has a total area of 35×38 mm2 and mounted on an FR4 substrate with dielectric permittivity constant 4.4 and thickness of 1.6 mm and loss tangent 0.025. The comparison between simulation and measurement results permits to validate the final achieved antenna structure in the desired RFID frequencies bands. Details of the proposed antenna design and both simulated and experimental results are described and discussed</p>

scholarly journals A Triple-Band Antenna Loaded with Reflector Surface for WLAN and 5G Applications

2020 ◽  
pp. 729-734
Author(s):  
Tengfei Hu ◽  
◽  
Zhenni Pan ◽  
Megumi Saitou ◽  
Jiang Liu ◽  
...  
Keyword(s):  
Base Stations ◽  
Antenna Design ◽  
Perfect Electric Conductor ◽  
Magnetic Conductor ◽  
Electric Conductor ◽  
Lower Band ◽  
Low Profile ◽  
Reflector Surface ◽  
Profile Characteristics ◽  
Triple Band

In this paper, a novel triple-band antenna with reflector surface which has the property of both artificial magnetic conductor (AMC) surface and perfect electric conductor (PEC) for WLAN and Sub-6G 5G applications is proposed. The presented antenna is composed of two parts: the AMC surface and the microstrip-fed printed dipole. Baluns are used to excite the dipoles. This antenna design combines the advantages of AMC and PEC. In lower band and middle band, the inserted board works as AMC surface. This AMC surface can help the antenna to achieve unidirectional radiation pattern and low-profile characteristics. While at upper band the antenna works as PEC surface. PEC surface increases the gain of the antenna in upper band. As a result, the proposed antenna can offer an impedance band from 2.39 GHz to 2.63 GHz and from 3.61 GHz to 3.72 GHz and from 5.61 GHz to 5.84 GHz when the S11 is less than - 10dB. Stable radiation patterns with peak gain of 5.6 dBi, 6.5 dBi and 9.6 dBi are obtained in lower band, middle band and upper band, respectively. The proposed antenna can be used for multiband base stations for WLAN and 5G applications.

A wideband, compact, high gain, low-profile, monopole antenna using wideband artificial magnetic conductor for off-body communications

2021 ◽  
pp. 1-10
Author(s):  
Bidisha Hazarika ◽  
Banani Basu ◽  
Arnab Nandi
Keyword(s):  
High Gain ◽  
Monopole Antenna ◽  
Impedance Bandwidth ◽  
Magnetic Conductor ◽  
Artificial Magnetic Conductor ◽  
Reflection Phase ◽  
Low Profile ◽  
Independent Behavior ◽  
Integrated Antenna ◽  
Body Loading

Abstract A wideband staircase pattern defected ground monopole antenna integrated with an artificial magnetic conductor (AMC) reflector has been proposed for C-band (4–8 GHz) and ITU band (8.01–8.5 GHz) applications. The integrated antenna consists of a staircase antenna at top, a 2 × 2 AMC reflector at the bottom and an air substrate as gap between them. The AMC offers 18.5% ± 90° reflection phase bandwidth from 6.10 to 7.32 GHz. The AMC layer has achieved mu-negative properties in the designated band. The AMC proffers polarization independent behavior in the respective frequency band depicting robustness in AMC reflection phase characteristics. The integrated antenna has offered a wide impedance bandwidth of 2.78 GHz (42.8% at 6.5 GHz and 34.1% at 8.15 GHz) due to the defected ground monopole. The integration of wideband AMC beneath the staircase monopole antenna alters the out of phase radiation to in-phase planer pattern which enhances the peak gain up to 9.7 dB. It reduces the 1-g averaged specific absorption rate to 0.223 and 0.324 W/kg at the two designated bands. The structure maintains almost similar bandwidth and gain due to artificial human body loading.

scholarly journals Small-Size Wide-Band Low-Profile “Pixel Antenna”: Comparison of Theoretical and Experimental Results in L Band

2019 ◽  
Vol 2019 ◽  
pp. 1-8 ◽  
Author(s):  
Mohamad Rammal ◽  
Mohamad Majed ◽  
Eric Arnaud ◽  
Joel Andrieu ◽  
Bernard Jecko
Keyword(s):  
Frequency Band ◽  
Wide Band ◽  
Experimental Results ◽  
Antenna Design ◽  
Antenna Performance ◽  
Low Profile ◽  
X Band ◽  
Working Principle ◽  
L Band ◽  
Large Frequency

This paper presents a small (≈λ/2 × λ/2) low-profile (λ/10) planar antenna built to work on a very large frequency band (≥40%) for applications in Telecom, Radar, IoT, etc. This antenna is called a “Pixel Antenna” because it was first used as a pixel in an agile beam radiating surface. In this paper, the pixel antenna is used alone to design multiband or wide-band antennas keeping the same radiation pattern and polarization throughout the band. The working principle used to design the Pixel Antenna is deduced from the well-known EBG (electromagnetic band gap) antenna in its low-profile version which already has a bandwidth close to ≈20%. The aim of this present work is to double this bandwidth by simultaneously feeding two modes of the original EBG material. The theoretical and experimental results are compared for an L band application, exhibiting bandwidth from 1 GHz to 1.52 GHz (41%). In addition, good radiation patterns of pixel antenna stay constant over the entire useful band without any degradation of the antenna performance. This proposed antenna design can be used to obtain wide bandwidth for any chosen frequency band (S band, X band, C band, etc.) using frequency scaling.

scholarly journals Broadband metasurfaces loaded with non-Foster elements

2021 ◽  
Vol 2015 (1) ◽  
pp. 012061
Author(s):  
Nikita Kalmykov ◽  
Bair Buiantuev ◽  
Dmitry Kholodnyak
Keyword(s):  
Frequency Band ◽  
Conversion Error ◽  
Magnetic Conductor ◽  
Bandwidth Extension ◽  
Artificial Magnetic Conductor ◽  
Low Profile ◽  
Low Profile Antennas ◽  
Unit Cells ◽  
Operational Frequency ◽  
Impedance Converter

Abstract Metasurfaces have been widely used to design low-profile antennas, thin absorbers, lenses etc. The operational frequency band of a metasurface is rather narrow due to its resonant nature. Loading metasurface unit cells with non-Foster elements allows for remarkable bandwidth extension. In this paper, design of a broadband metasurface to operate as an artificial magnetic conductor is considered. The main issues which influence the bandwidth extension such as implementation of the non-Foster load, minimization of conversion error of a negative impedance converter, and circuit stabilization are addressed.

A compact flexible textile artificial magnetic conductor-based wearable monopole antenna for low specific absorption rate wrist applications

2020 ◽  
pp. 1-7 ◽  
Author(s):  
Mohamed El Atrash ◽  
Mahmoud A. Abdalla ◽  
Hadia M. Elhennawy
Keyword(s):  
Absorption Rate ◽  
Specific Absorption Rate ◽  
Integrated Design ◽  
Monopole Antenna ◽  
Human Hand ◽  
Total Efficiency ◽  
Magnetic Conductor ◽  
Specific Absorption ◽  
Hand Model ◽  
Human Hand Model

Abstract A compact monopole antenna backed with a 1 × 2 textile-based artificial magnetic conductor (AMC) array is proposed. Textile was mainly selected for the AMC materials according to an investigation that took place between different AMC substrate materials, where it was settled that the textile one displayed the highest antenna gain and efficiency. The monopole antenna and the AMC, distanced apart by 5 mm, combined form the integrated design. It operates at 2.4 GHz, which was particularly selected as the resonant frequency for wirelessly sending the subject's symptoms data via Wi-Fi, with realized gain and total efficiency of 6.76 dBi and 88.4%, respectively, in free space. Separated by 3 mm from the specific anthropomorphic mannequin human hand model, it displays a realized gain and total efficiency of 4.06 dBi and 44.39%, respectively, in a flat condition. Furthermore, it exhibits a specific absorption rate (SAR) of 1.8 W/kg averaged over 10 g of tissue. When bent over the human hand model, it performs well and exhibits a maximum SAR of 0.521 and 0.406 W/kg, averaged over 1 and 10 g of tissues, respectively. As a result of such outcomes, the proposed integrated design can be nominated for wearable hand/wrist and Wi-Fi applications.

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