scholarly journals Design and performance of two-sleeve low profile antenna for bio-medical applications

2017 ◽  
Vol 4 (1) ◽  
pp. 49-61 ◽  
Author(s):  
Shikha Sukhija ◽  
R.K. Sarin
Keyword(s):  
Medical Applications ◽  
Low Profile ◽  
And Performance

scholarly journals Design and Performance Analysis of a Compact Planar MIMO Antenna for IoT Applications

Sensors ◽  
2021 ◽  
Vol 21 (23) ◽  
pp. 7909
Author(s):  
Saminathan Thiruvenkadam ◽  
Eswaran Parthasarathy ◽  
Sandeep Kumar Palaniswamy ◽  
Sachin Kumar ◽  
Lulu Wang
Keyword(s):  
Multiple Input Multiple Output ◽  
Back Side ◽  
Mimo Antenna ◽  
Iot Applications ◽  
Quarter Wavelength ◽  
Low Profile ◽  
Compact Size ◽  
Communication Devices ◽  
Input Multiple Output ◽  
And Performance

This article presents a quad-band multiple-input-multiple-output (MIMO) antenna for the Internet of Things (IoT) applications. The proposed antenna consists of four quarter-wavelength asymmetrical meandered radiators, microstrip feed lines, and modified ground planes. The antenna elements are arranged in a chiral pattern to improve isolation between them, with two radiators and two ground planes placed on the front side of the substrate and the other two on the back side. The MIMO antenna has an operating bandwidth (S11 ≤ −10 dB) of 1.76–1.84 GHz, 2.37–2.56 GHz, 3.23–3.68 GHz, and 5.34–5.84 GHz, covering GSM, WLAN, WiMAX, and 5G frequency bands. The isolation between the radiating elements is greater than 18 dB in the operating bands. The peak gain of the antenna is 3.6 dBi, and the envelope correlation coefficient (ECC) is less than 0.04. Furthermore, the proposed antenna is validated for IoT-based smart home (SH) applications. The prototype MIMO antenna is integrated with a commercially available ZigBee device, and the measured values are found to be consistent with the expected results. The proposed MIMO antenna could be a good candidate for IoT systems/modules due to its low profile, compact size, lightweight, and easy integration with wireless communication devices.

The Effects of Diameter and Rotational Speed on the Aerodynamic Performance of Low Profile Miniature Radial Flow Fans

2007 ◽  
Author(s):  
R. Grimes ◽  
P. Walsh ◽  
E. Walsh ◽  
V. Egan
Keyword(s):  
Reynolds Number ◽  
Power Consumption ◽  
Flow Rate ◽  
Radial Flow ◽  
Pressure Rise ◽  
Reynolds Numbers ◽  
Aerodynamic Performance ◽  
Low Profile ◽  
And Performance ◽  
High Reynolds

Space constraints in many emerging electronic systems mean that there is a growing demand for heat sinks which are low in profile. As a result, small, low profile fans are necessary. In many instances Radial flow fans are best suited. An understanding of the design and performance of these fans is therefore necessary. For radial flow fans little work has been done to quantify the deviation of aerodynamic performance from that predicted by conventional fan laws. This paper aims to address this situation, by performing measurements of pressure rise, flow rate and power consumption for 3.5mm high radial flow fan rotors ranging in diameter from 20 to 35mm over a range of speeds. Measurements presented show variations of pressure rise and flow rate with Reynolds number to be largely in accordance with trends predicted by high Reynolds number theory, with the exception of flow rates at the lower range of Reynolds numbers which fell below the predicted values. Variations in power consumption show a similar trend to those of flow rate, with power consumption obeying the fan laws for the higher Reynolds numbers investigated, but showing a large increase at the lower Reynolds numbers.

scholarly journals Chiral Dielectric Metasurfaces for Highly Integrated, Broadband Circularly Polarized Antenna

Sensors ◽  
2021 ◽  
Vol 21 (6) ◽  
pp. 2071
Author(s):  
Bruno Ferreira-Gomes ◽  
Osvaldo N. Oliveira ◽  
Jorge Ricardo Mejía-Salazar
Keyword(s):  
Impedance Matching ◽  
Axial Ratio ◽  
Satellite Communications ◽  
High Gain ◽  
Circularly Polarized ◽  
Low Profile ◽  
Millimeter Wave Antenna ◽  
And Performance ◽  
Magnetic Resonances ◽  
Magnetic Pairing

We report on the design of a low-profile integrated millimeter-wave antenna for efficient and broadband circularly polarized electromagnetic radiation. The designed antenna comprises a chiral dielectric metasurface built with a 2×2 arrangement of dielectric cylinders with slanted-slots at the center. A broadbeam high-gain with wide axial ratio (AR)<3 dB bandwidth was reached by pairing the electric and magnetic resonances of the dielectric cylinders and the slanted slots when excited by an elliptically polarized driven-patch antenna. This electric-magnetic pairing can be tuned by varying the cylinders diameter and the tilting and rotation angles of the slanted slots. The simulation results indicate impedance-matching bandwidths up to 22.6% (25.3–31.6 GHz) with 3-dB AR bandwidths of 11.6% (26.9–30.2 GHz), which in terms of compactness (0.95λ0×0.95λ0) and performance are superior to previous antenna designs. Since the simulations were performed by assuming materials and geometries easily implementable experimentally, it is hoped that circularly polarized antennas based on chiral metasurfaces can be integrated into 5G and satellite communications.

Artificial Surfaces and Media for Electromagnetic Absorption and Interference Shielding

2021 ◽  
Author(s):  
Pai-Yen Chen ◽  
Mohamed Farhat ◽  
Zhilu Ye ◽  
Muhammad Amin ◽  
Hakan Bagci ◽  
...  
Keyword(s):  
Electromagnetic Interference ◽  
Electromagnetic Compatibility ◽  
Recent Progress ◽  
Performance Comparison ◽  
Emi Shielding ◽  
Low Profile ◽  
Artificial Surfaces ◽  
Negative Impacts ◽  
And Performance ◽  
Electromagnetic Pollution

The rapid advent of radio-frequency (RF) and microwave technologies and systems have given rise to serious electromagnetic pollution, interference and jamming for high-precision detection devices, and even threats to human health. To mitigate these negative impacts, electromagnetic interference (EMI) shielding materials and structures have been widely deployed to isolate sophisticated instruments or human settlements from potential EMI sources growing every day. We discuss recent advances in lightweight, low-profile electromagnetic absorbing media, such as metamaterials, metasurfaces, and nanomaterial-based solutions, which may provide a relatively easy solution for EMI shielding and suppressing unwanted RF and microwave noises. We present a general review of the recent progress on theories, designs, modeling techniques, fabrication, and performance comparison for these emerging EMI and electromagnetic compatibility (EMC) media.

Design and Performance Analysis of Vivaldi Antenna for Medical Applications

2020 ◽  
Author(s):  
Lakshmi Narayana Thalluri ◽  
Anji Reddy Nallapu ◽  
Ramakrishna Konda ◽  
S. Sai deep ◽  
Kata Naga Harsha
Keyword(s):  
Performance Analysis ◽  
Medical Applications ◽  
Vivaldi Antenna ◽  
And Performance
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