scholarly journals A Dual-Band Conformal Antenna Based on Highly Conductive Graphene-Assembled Films for 5G WLAN Applications

Materials ◽  
2021 ◽  
Vol 14 (17) ◽  
pp. 5087
Author(s):  
Zelong Hu ◽  
Zhuohua Xiao ◽  
Shaoqiu Jiang ◽  
Rongguo Song ◽  
Daping He
Keyword(s):  
Spectral Power ◽  
Signal To Noise Ratio ◽  
Split Ring Resonator ◽  
Open Circuit ◽  
Dual Band ◽  
Conformal Antenna ◽  
Half Wavelength ◽  
Low Profile ◽  
Rf Electronics ◽  
The Internet Of Things

Flexible electronic devices are widely used in the Internet of Things, smart home and wearable devices, especially in carriers with irregular curved surfaces. Light weight, flexible and corrosion-resistant carbon-based materials have been extensively investigated in RF electronics. However, the insufficient electrical conductivity limits their further application. In this work, a flexible and low-profile dual-band Vivaldi antenna based on highly conductive graphene-assembled films (GAF) is proposed for 5G Wi-Fi applications. The proposed GAF antenna with the profile of 0.548 mm comprises a split ring resonator and open circuit half wavelength resonator to implement the dual band-notched characteristic. The operating frequency of the flexible GAF antenna covers the Wi-Fi 6e band, 2.4–2.45 GHz and 5.15–7.1 GHz. Different conformal applications are simulated by attaching the antenna to the surface of cylinders with different radii. The measured results show that the working frequency bands and the radiation patterns of the GAF antenna are relatively stable, with a bending angle of 180°. For demonstration of practical application, the GAF antennas are conformed to a commercial router. The spectral power of the GAF antenna router is greater than the copper antenna router, which means a higher signal-to-noise ratio and a longer transmission range can be achieved. All results indicate that the proposed GAF antenna has broad application prospects in next generation Wi-Fi.

Design of Multiband Conformal Loop Antenna for Telemetry Applications

2020 ◽  
pp. 85-88
Author(s):  
Rajeswari P ◽  
Gobinath A ◽  
Deebiga B ◽  
Gnanasundari S
Keyword(s):  
Real Time ◽  
Human Body ◽  
Biological Information ◽  
Dual Band ◽  
Communication Link ◽  
Reliable Communication ◽  
Communication Performance ◽  
Conformal Antenna ◽  
Half Wavelength ◽  
Inner Surface

The conformal antenna consisting two loop elements is presented at 2.45 GHz industrial, scientific and medical band. The two elements are attached on the inner surface of the capsule, so that inner capsule space is saved to its maximum extent. Additionally, by orthogonally placing the two elements at bottom and side of the capsule, different polarization directions are achieved; therefore, resulting in good isolation without introducing additional decoupling structures. This system has the potential to provide real-time biological information from within the human body via a radio frequency link. Furthermore, communication link of the conformal antenna with outside dipole is evaluated, revealing reliable communication performance. The performance of the communication link between the implanted antenna and external half-wavelength dual-band dipole is also examined.

Low-profile, extremely wideband, dual-band-notched MIMO antenna for UWB applications

2019 ◽  
Vol 11 (7) ◽  
pp. 719-728 ◽  
Author(s):  
Ankan Bhattacharya ◽  
Bappadittya Roy ◽  
Rafael F. S. Caldeirinha ◽  
Anup K. Bhattacharjee
Keyword(s):  
Coupling Effect ◽  
Ground Plane ◽  
Multiple Input Multiple Output ◽  
Split Ring Resonator ◽  
Fine Tuning ◽  
Dual Band ◽  
Center Frequency ◽  
Impedance Bandwidth ◽  
Mimo Antenna ◽  
Low Profile

AbstractIn this article, an extremely wideband, isolation-enhanced, low-profile “Multiple-Input-Multiple-Output” (MIMO) antenna along with dual-band-notched features has been investigated. The antenna proposed herein, possesses two mutually orthogonal staircase-etched radiators for achieving a wide bandwidth. The radiating elements are placed mutually perpendicular in order to achieve polarization diversity and high isolation, i.e. for minimization of mutual coupling effect between adjacent radiating elements. The antenna exhibits an extremely wide frequency bandwidth covering 1.2–19.4 GHz except two frequency band notches centered at 3.5 and 5.5 GHz, respectively, originated due to the incorporation of a “Rectangular Complementary Split Ring Resonator (RCSRR)” structure and by etching dual “L-shaped” slits in the ground plane. The center frequency of the notched bands is adjusted by fine tuning of the dimensions of the incorporated band-notching structures. Isolation level (S21) better than −20 dB has been obtained due to the insertion of a “T-shaped” parasitic element as a decoupling structure. A prototype of the proposed antenna having dimension of 20 mm × 20 mm (0.08 λo × 0.08 λo) is fabricated and the antenna responses have been measured. Obtained results show that the miniaturized MIMO diversity antenna is undoubtedly a capable contender for communications supporting an extremely wide impedance bandwidth along with band-notched features for WLAN and WiMAX.

A Novel Pentagonal Shaped Planar Inverted-F Antenna for Defense Applications

2019 ◽  
Vol 12 (2) ◽  
pp. 95-100
Author(s):  
Purnima Sharma ◽  
Akshi Kotecha ◽  
Rama Choudhary ◽  
Partha Pratim Bhattacharya
Keyword(s):  
Mobile Communication ◽  
Satellite Communication ◽  
Dual Band ◽  
Vehicular Communication ◽  
Radio Frequency Field ◽  
Wireless Applications ◽  
High Frequency Structure Simulator ◽  
Low Profile ◽  
Radar Satellite ◽  
5 Ghz

Background: The Planar Inverted-F Antenna (PIFA) is most widely used for wireless communication applications due to its unique properties as low Specific Absorption Rate, low profile geometry and easy fabrication. In literature a number of multiband PIFA designs are available that support various wireless applications in mobile communication, satellite communication and radio frequency field. Methods: In this paper, a miniature sized planar inverted-F antenna has been proposed for dual-band operation. The antenna consists of an asymmetrical pentagonal shaped patch over an FR4 substrate. The overall antenna dimension is 10 × 10 × 3 mm3 and resonates at 5.7 GHz frequency. A modification is done in the patch structure by introducing an asymmetrical pentagon slot. Results: The proposed pentagonal antenna resonates at 5.7 GHz frequency. Further, modified antenna resonates at two bands. The lower band resonates at 5 GHz and having a bandwidth of 1.5 GHz. This band corresponds to C-band, which is suitable for satellite communication. The upper band is at 7.9 GHz with a bandwidth of 500 MHz. Performance parameters such as return loss, VSWR, input impedance and radiation pattern are obtained and analysed using ANSYS High- Frequency Structure Simulator. The radiation patterns obtained are directional, which are suitable for mobile communication. Conclusion: The antenna is compact in size and suitable for radar, satellite and vehicular communication.

Dual Band Low Profile Antenna for Body Centric Communications

2013 ◽  
Vol 61 (4) ◽  
pp. 2282-2285 ◽  
Author(s):  
Zhen Guo Liu ◽  
Yong Xin Guo
Keyword(s):  
Dual Band ◽  
Low Profile

A thin and optically transparent infrared-radar compatible stealth structure with low emissivity and broadband absorption

2021 ◽  
Author(s):  
Xiaoxue Tan ◽  
Juan Chen ◽  
Jianxing Li
Keyword(s):  
Dual Band ◽  
Center Frequency ◽  
Infrared Emissivity ◽  
Infrared Band ◽  
Functional Layer ◽  
Resistive Film ◽  
Broadband Absorption ◽  
Low Profile ◽  
Optically Transparent ◽  
Transparent Composite

Abstract In this paper, an optically transparent structure that combines broadband absorption and low infrared emissivity for dual-band stealth is proposed. The whole structure includes two functional layers. The periodic resistive film of the upper functional layer acts on infrared stealth. Its emissivity in the infrared band of 8-14μm is lower than 0.3. Another functional layer achieves greater than 90% wide absorption from 6 to 18.5 GHz. The whole optically transparent composite structure has a low profile of 0.141λ0, where λ0 is the wavelength of free space at the center frequency. It has an absorptivity that greater than 90% in the region of 5.7-16.5 GHz and has wide angular stability. Measured result is consistent with the simulation which verify the performance of the proposal. The infrared-radar compatible stealth structure proposed in this paper has potential application in the field of multi-spectrum compatible stealth.

Dual-Band and Low-Profile Differentially Fed Slot Antenna for Wide-Angle Scanning Phased Array

2018 ◽  
Vol 17 (2) ◽  
pp. 259-262 ◽  
Author(s):  
Jiajia Guo ◽  
Shaoqiu Xiao ◽  
Shaowei Liao ◽  
Bingzhong Wang ◽  
Quan Xue
Keyword(s):  
Phased Array ◽  
Dual Band ◽  
Slot Antenna ◽  
Wide Angle ◽  
Low Profile
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