Comparison of circular, square cell and hexagonal cell artificial magnetic conductors for broadband staggered dipole arrays with low profile

2017 ◽  
Author(s):  
Halim Boutayeb ◽  
Paul Watson
Keyword(s):  
Hexagonal Cell ◽  
Low Profile ◽  
Artificial Magnetic Conductors ◽  
Square Cell

scholarly journals Low Profile EBG Resonator Antennas

2009 ◽  
Vol 2009 ◽  
pp. 1-7 ◽  
Author(s):  
R. Chantalat ◽  
L. Moustafa ◽  
M. Thevenot ◽  
T. Monediere ◽  
B. Jecko
Keyword(s):  
Frequency Selective Surface ◽  
Theory Approach ◽  
High Impedance ◽  
Full Wave ◽  
Half Wavelength ◽  
Low Profile ◽  
Artificial Magnetic Conductors ◽  
Full Wave Analysis ◽  
Small Antenna ◽  
High Impedance Surface

An Electromagnetic Band Gap (EBG) antenna is a planar structure which is composed of a cavity and an EBG material. In most applications, the height of the EBG antenna is half wavelength. We present in this paper the conditions to reduce the profile of an EBG antenna to subwavelength values. It could be achieved by using a cavity upper interface which exhibits negative reflection phase. Frequency Selective Surface (FSS) based on Babinet principle, that satisfies this condition, will be described using full wave analysis. These periodic metallic arrays are employed in the design of a low profile EBG antenna which has a directivity of 10 dBi. As this EBG antenna design is similar to a small antenna over an Artificial Magnetic Conductors (AMC) surfaces or High Impedance Surface (HIS), the EBG antenna principle could be a new theory approach for the AMC or HIS. This point is discussed in this paper.

scholarly journals Sievenpiper HIS and its influence on antenna correlation

2008 ◽  
Vol 6 ◽  
pp. 39-44 ◽  
Author(s):  
S. K. Hampel ◽  
O. Schmitz ◽  
I. Rolfes
Keyword(s):  
Antenna Arrays ◽  
Performance Criteria ◽  
Electromagnetic Analysis ◽  
Planar Antenna ◽  
High Impedance ◽  
Full Wave ◽  
Low Profile ◽  
Artificial Magnetic Conductors ◽  
Low Profile Antennas ◽  
Antenna Correlation

Abstract. \\label{sec:abstract} This paper deals with the influence of artificial magnetic conductors (AMC), so-called Sievenpiper High Impedance Surfaces (HIS), on the MIMO and Diversity performance of a planar linear-polarized 2×2 dipole array in the ISM-band at 2.45 GHz. The characteristic performance criteria such as envelope correlation coefficient, spectral efficiency, Mean Effective Gain (MEG) and Diversity gain of a coupled 2×2 dipole array are investigated. By means of full-wave electromagnetic analysis as well as Monte-Carlo simulations applying statistical channel models the characteristic antenna pattern just as the MIMO and Diversity analysis is performed, respectively. The obtained results show that the application of Sievenpiper High Impedance Surfaces to planar antenna arrays enables good MIMO and Diversity performance compared to ideal configurations in free-space while offering the design of low profile antennas with simultaneously enhanced characteristics.

scholarly journals Resonant waves and localization phenomena in lattices

2019 ◽  
Vol 377 (2156) ◽  
pp. 20190110
Author(s):  
Sagdulla A. Abdukadirov ◽  
Mark V. Ayzenberg-Stepanenko ◽  
Gregory G. Osharovich
Keyword(s):  
Three Dimensional ◽  
Wave Processes ◽  
Theme Issue ◽  
Hexagonal Cell ◽  
Transient Wave ◽  
Structured Media ◽  
Different Types ◽  
Mass Spring ◽  
Square Cell ◽  
Dynamic Phenomena

Transient wave processes in mass-spring lattices excited by point oscillating sources are studied. Dispersion properties of uniform periodic three-dimensional (3D) square-cell and two-dimensional (2D) hexagonal-cell lattices including revealed star-shaped localization phenomena are analysed. The resonant-like waves and localization-like patterns in non-uniform lattices possessing predetermined and randomly distributed defects are numerically examined in order to identify the sensitivity of star-shape forms to different types of defects. This article is part of the theme issue ‘Modelling of dynamic phenomena and localization in structured media (part 1)’.

6F Low-Profile Stents zur Anlage eines TIPSS – ein Widerspruch?

2008 ◽  
Vol 180 (S 1) ◽  
Author(s):  
J Wiskirchen ◽  
K Brechtel ◽  
A Fischmann ◽  
G Tepe ◽  
S Miller ◽  
...  
Keyword(s):  
Low Profile

A New Fixed-wire, ‘Stent-on-a-wire’, Very-low-profile Stent Delivery System – Rationale, Design and Update

2010 ◽  
Vol 5 (1) ◽  
pp. 20 ◽  
Author(s):  
Tim A Fischell ◽  
Keyword(s):  
Delivery System ◽  
Cost Savings ◽  
Coronary Stenting ◽  
Bleeding Complications ◽  
Need For Closure ◽  
Procedural Cost ◽  
Low Profile ◽  
Direct Stenting ◽  
Coronary Artery Stenting ◽  
Time Required

Coronary artery stenting has evolved substantially since the first use of coronary stenting as an adjunct to balloon angioplasty in the early 1990s. The performance (and particularly the deliverability) of coronary stents has improved such that coronary stenting is now the primary mode of revascularisation for percutaneous coronary interventions (PCIs) in more than 95% of cases. The new Svelte™ stent-on-a-wire (SOAW) delivery system represents one of the first substantive innovations in stent delivery systems (SDS) in more than a decade. This SDS uses a shapeable ‘fixed wire’ as an integral part of the SDS. This allows a significant reduction in SDS profile (~0.029 inches) compared with conventional monorail or over-the-wire SDS. This SOAW SDS is intended to facilitate direct stenting. It has the potential to provide substantial procedural cost savings by eliminating the need for a coronary guidewire and balloon pre-dilatation and/or post-dilatation, and by reducing contrast use and the time required to complete the procedure. The SOAW system is compatible with 5Fr guiding catheters, and may reduce the need for closure devices, facilitate stenting via the radial approach and (potentially) reduce bleeding risks. In conclusion, the Svelte SOAW SDS represents a new very-low-profile balloon-expandable SDS that should promote direct stenting in PCIs. The efficiency and small profile of this SDS may allow procedural cost savings, a reduction in procedure time and a reduced risk of bleeding complications. These theoretical advantages will need to be demonstrated in clinical trials.

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