scholarly journals Advantages and Disadvantages of Different Coupling Methods of Plasma Antennas

2021 ◽  
Author(s):  
Mostafa Hadaegh ◽  
Farzad Mohajeri
Keyword(s):  
Cost Structure ◽  
Capacitive Coupling ◽  
Sensitivity To Change ◽  
Implementation Cost ◽  
Antenna Structure ◽  
Advantages And Disadvantages ◽  
Coupling Methods ◽  
Coupling Structure ◽  
Pattern Shape ◽  
Rf Signal

Abstract One of the important challenges in plasma antennas, is the coupling of RF signal to the plasma column. RF signal coupling has a significant effect on antenna efficiency, antenna implementation cost, structure implementation complexity, antenna pattern shape, and final structure weight and volume. In this article, firstly the various methods of coupling were introduced. Then capacitive coupling, direct coupling and sleeve coupling were presented and their advantages and disadvantages were mentioned. As a sample, a plasma folded monopole antenna with sleeve coupling was fabricated and measured. By comparison of the different coupling methods and as a result, one can conclude that the sleeve coupling method is the most suitable method. This method has the least sensitivity to change the dimensions. It is also easy and cheap to implement. In this type of coupling, the efficiency of the Nesta antenna is suitable and the coupling structure adds small weight and volume to the antenna structure.

scholarly journals Low-Leakage Capacitive Coupling Structure for a-Si:H Gate Driver With Less Delay of Clock Signals Used in AMLCDs

2020 ◽  
Vol 8 ◽  
pp. 302-307
Author(s):  
Ming-Yang Deng ◽  
Wei-Sheng Liao ◽  
Sung-Chun Chen ◽  
Jui-Hung Chang ◽  
Chia-En Wu ◽  
...  
Keyword(s):  
Capacitive Coupling ◽  
Low Leakage ◽  
Coupling Structure ◽  
Gate Driver

scholarly journals A CMOS MEMS Humidity Sensor Enhanced by a Capacitive Coupling Structure

Micromachines ◽  
2016 ◽  
Vol 7 (5) ◽  
pp. 74 ◽  
Author(s):  
Jian-Qiu Huang ◽  
Baoye Li ◽  
Wenhao Chen
Keyword(s):  
Humidity Sensor ◽  
Capacitive Coupling ◽  
Coupling Structure ◽  
Cmos Mems

A 10 GHz multiphase LC VCO with a ring capacitive coupling structure

2012 ◽  
Vol 55 (11) ◽  
pp. 2656-2662 ◽  
Author(s):  
YingMei Chen ◽  
Hui Wang ◽  
ShuangChao Yan ◽  
Li Zhang
Keyword(s):  
Capacitive Coupling ◽  
Coupling Structure ◽  
Lc Vco

scholarly journals Design of capacitive coupling structure for position‐insensitive wireless charging

2020 ◽  
Vol 13 (10) ◽  
pp. 1946-1955
Author(s):  
Gao Han ◽  
Qian Li ◽  
Kai Xie ◽  
Yanming Liu ◽  
Jiangwen Song
Keyword(s):  
Capacitive Coupling ◽  
Wireless Charging ◽  
Coupling Structure

Cryogenic atomic force microscopy

1991 ◽  
Vol 49 ◽  
pp. 54-55
Author(s):  
K. A. Fisher ◽  
M. G. L. Gustafsson ◽  
M. B. Shattuck ◽  
J. Clarke
Keyword(s):  
Room Temperature ◽  
Rapid Freezing ◽  
Cryogenic Temperatures ◽  
Soft Or ◽  
Electrically Conductive ◽  
Force Microscopy ◽  
Flexible Molecules ◽  
Advantages And Disadvantages ◽  
Atomic Force ◽  
Chemical Perturbation

The atomic force microscope (AFM) is capable of imaging electrically conductive and non-conductive surfaces at atomic resolution. When used to image biological samples, however, lateral resolution is often limited to nanometer levels, due primarily to AFM tip/sample interactions. Several approaches to immobilize and stabilize soft or flexible molecules for AFM have been examined, notably, tethering coating, and freezing. Although each approach has its advantages and disadvantages, rapid freezing techniques have the special advantage of avoiding chemical perturbation, and minimizing physical disruption of the sample. Scanning with an AFM at cryogenic temperatures has the potential to image frozen biomolecules at high resolution. We have constructed a force microscope capable of operating immersed in liquid n-pentane and have tested its performance at room temperature with carbon and metal-coated samples, and at 143° K with uncoated ferritin and purple membrane (PM).

A conduction-cooled stage for high-resolution Cryo-SEM

1992 ◽  
Vol 50 (2) ◽  
pp. 1282-1283
Author(s):  
John G. Sheehan
Keyword(s):  
High Resolution ◽  
Liquid Nitrogen ◽  
Mechanical Stability ◽  
Cooling System ◽  
Cold Trap ◽  
Nitrogen Gas ◽  
Particulate Suspensions ◽  
Advantages And Disadvantages ◽  
Convection Cooling ◽  
Styrene Butadiene

The goal is to examine with high resolution cryo-SEM aqueous particulate suspensions used in coatings for printable paper. A metal-coating chamber for cryo-preparation of such suspensions was described previously. Here, a new conduction-cooling system for the stage and cold-trap in an SEM specimen chamber is described. Its advantages and disadvantages are compared to a convection-cooling system made by Hexland (model CT1000A) and its mechanical stability is demonstrated by examining a sample of styrene-butadiene latex.In recent high resolution cryo-SEM, some stages are cooled by conduction, others by convection. In the latter, heat is convected from the specimen stage by cold nitrogen gas from a liquid-nitrogen cooled evaporative heat exchanger. The advantage is the fast cooling: the Hexland CT1000A cools the stage from ambient temperature to 88 K in about 20 min. However it consumes huge amounts of liquid-nitrogen and nitrogen gas: about 1 ℓ/h of liquid-nitrogen and 400 gm/h of nitrogen gas. Its liquid-nitrogen vessel must be re-filled at least every 40 min.

Computer simulations for the TEM bend contour technique

1996 ◽  
Vol 54 ◽  
pp. 134-135
Author(s):  
Vladimir Yu. Kolosov ◽  
Anders R. Thölén
Keyword(s):  
Computer Simulations ◽  
Real Space ◽  
Advantages And Disadvantages ◽  
Short Overview ◽  
Diffraction Contrast ◽  
Beam Method ◽  
Convergent Beam ◽  
Contour Technique

In this paper we give a short overview of two TEM applications utilizing the extinction bend contour technique (BC) giving the advantages and disadvantages; especially we consider two areas in which the BC technique remains unique. Special attention is given to an approach including computer simulations of TEM micrographs.BC patterns are often observed in TEM studies but are rarely exploited in a serious way. However, this type of diffraction contrast was one of the first to be used for analysis of imperfections in crystalline foils, but since then only some groups have utilized the BC technique. The most extensive studies were performed by Steeds, Eades and colleagues. They were the first to demonstrate the unique possibilities of the BC method and named it real space crystallography, which developed later into the somewhat similar but more powerful convergent beam method. Maybe, due to the difficulties in analysis, BCs have seldom been used in TEM, and then mainly to visualize different imperfections and transformations.

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