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	Smith chart - Wikipedia, the free encyclopedia
		A Smith chart is a type of nomogram used in electrical engineering that shows how the complex impedance of a transmission line varies along its length.
		The chart itself occurs in the complex plane - the horizontal axis is the real (resistive) component of the impedance, while the vertical axis is the imaginary (reactive) component of the impedance.
		The perimeter of the chart corresponds to 100% reflection, and the angles printed around the perimeter indicate the phase of the reflection coefficient from zero to 180°, or half a wavelength.
	en.wikipedia.org /wiki/Smith_chart (463 words)

	Smith Chart (Site not responding. Last check: 2007-11-03)
		The Smith chart provides a graphical procedure for the solution of transmission line problems, such as the determination of the impedance or impedances and their placement position along a mismatched transmission line, in order to match that line.
		The advantages of using a Smith chart for the solution of transmission line and waveguide problems is the ease in arriving at a graphical solution over the alternative computational methods and the intuitive understanding of the effect that individual variables have on the final solution.
		In addition to the circles and arcs, the edge of the chart is marked with scales of the angle of the reflection coefficient (in degrees), and the distance (in wavelengths) along the line from either the source or the generator.
	aa.1asphost.com /tonyart/tonyt/Applets/Smith/Smith.html (2110 words)

	The Smith Chart
		The SMITH chart is presented in terms of dimensionless normalised impedance, where the actual impedance of interest is divided by the Zo of the particular line being used.
		The centre of the SMITH chart is at gamma = 0 which is where the transmission line is "matched", and where the normalised load impedance z=1+j0; that is, the resistive part of the load impedance equals the transmission line impedance, and the reactive part of the load impedance is zero.
		We remember that the SMITH chart is a polar plot of the complex reflection coefficient, which represents the ratio of the complex amplitudes of the backward and forward waves.
	www.antennex.com /preview/Folder03/Oct4/smith.htm (2390 words)

	REFLECTIONS AND STANDING WAVE RATIO
		This impedance is plotted on the Smith Chart at the intersection of the 0.5 resistance circle and the +1.0 reactance circle, as indicated in Fig 3.
		This is represented on the Smith Chart by drawing a 3:1 constant SWR circle (a circle with a radius of 3 on the resistance axis) as in Fig 5.
		This is plotted on the chart at the intersection of the 0.5 resistance and the +0.5 reactance circles, as in Fig 6.
	www.ycars.org /EFRA/Module%20C/TLSmith.htm (2711 words)

	Smith Chart Basics - Microwave Encyclopedia - Microwaves101.com (Site not responding. Last check: 2007-11-03)
		You can find books and articles describing how a Smith chart is a graphical representation of the transmission line equations and the mathematical reasons for the circles and arcs, but these things don't really matter when you need to get the job done.
		The "immittance" Smith chart simply has both the impedance and admittance grids on the same chart, which is useful for cascading series-connected with parallel-connected circuits.
		Place your pencil at the SC point on the chart and move clockwise toward the generator (at the other end of the stub) on the rim by an amount less than a quarter wavelength (180 degrees on the chart).
	www.microwaves101.com /encyclopedia/smithchart.cfm (2395 words)

	IEEEVM: The Smith Chart
		This simplified version of a Smith Chart shows both resistance in ohms (numbers on the horizontal axis that range from 0.2 to 10) and the angle of a quantity called the reflection coefficient, in degrees on the outer edge of the circle.
		Smith originally designed his chart to solve problems he encountered in transmitting radio waves along a special type of cable called a transmission line that conducts the waves from a radio transmitter to an antenna.
		Smith tried to graph the effects of these reflections on an early type of rectangular chart developed by J. Fleming for telephone lines, but he kept getting numbers that went off the top and bottom of the chart.
	www.ieee-virtual-museum.org /collection/event.php?taid=&id=3456988&lid=1 (474 words)

	Stub Matching Using the SMITH Chart (Site not responding. Last check: 2007-11-03)
		For navigational understanding on the SMITH chart, the distance out from the centre of the chart to the orange circle is 0.141 of the distance to the perimeter.
		Notice that as the coaxial cable is an unbalanced transmission line, and the dipole is a balanced antenna, we need a balun at the connection to the dipole to stop return current from flowing down the outside of the coaxial braid and contributing to the radiation and therefore affecting the impedance.
		Follow the circle of constant radius on the SMITH chart towards the generator until the locus crosses the r=1 circle.
	www.ee.surrey.ac.uk /Personal/D.Jefferies/antennexarticles/stub.htm (3121 words)

	Electronic Applications of the Smith Chart (Site not responding. Last check: 2007-11-03)
		This book describes how the Smith Chart is used for designing lumped element and transmission line circuits and includes tutorial material on transmission line theory and behavior, circuit representation on the chart, matching networks, network transformations and broadband matching.
		He first conceived the Smith Chart in the 1930s as an electrical engineer at Bell Labs, but the chart was slow to gain acceptance until 1940, when the M.I.T. Radiation Laboratory first recognized its value.
		Smith passed away in 1987 and was posthumously elected to the New Jersey Inventors Hall of Fame in 1994.
	www.wr6wr.com /newSite/products/books/easc.html (275 words)

	Smith Chart Graph (Site not responding. Last check: 2007-11-03)
		A smith chart maps part of the impedance plane (usually the right or positive real half) onto a unit circle.
		The center of the smith chart represents the normalizing impedance, typically 50 ohms.
		As you pass the cursor over a smith chart, the status bar at the bottom of the program displays the corresponding reflection coefficient under the cursor rather than impedance.
	www.ardentech.com /Eclipse/smithcht.htm (234 words)

	microwave
		The smith chart is not a phenomenon.This chart can very simply the calculations in microwave such as the impedance, admitance, and S parameters.
		Smith chart is nothing but transformation of cartesian coordinate system for positive real axe of impedance or reflexion coeficient plane in to diagram where zero and infinite values of real and imaginary axes are presented on single drawing.
		Smith chart is used generally for simplification of solving the transmition lines problems.
	www.edaboard.com /ftopic81568.html (1022 words)

	Impedance matching and the Smith chart - The fundamentals.
		The Smith chart is a polar plot of the complex reflection coefficient (also called gamma and symbolized by cap gamma).
		A Smith chart is developed by examining the load where the impedance must be matched.
		Since the Smith chart resolution technique is basically a graphical method, the precision of the solutions depends directly on the graph definitions.
	rfdesign.com /mag/radio_impedance_matching_smith/index.html (4380 words)

	The Smith chart: more vital after all these years - 3/18/1999 - EDN (Site not responding. Last check: 2007-11-03)
		Using the Smith chart, you can graphically illustrate the complex impedance, Z=R+jX, of a transmission line, antenna, amplifier, or any signal point in the RF range at which the simple resistive approximation is not sufficiently valid.
		Once you learn how to use the Smith chart to plot impedances, match sources and loads, and determine admittance (the inverse of complex impedance, which is useful for stub tuning), it becomes a powerful tool.
		Smith kept working on the problem, and by 1936 he developed a chart that used special polar coordinates, which could handle all impedance values.
	www.edn.com /article/CA56700.html (1389 words)

	[No title] (Site not responding. Last check: 2007-11-03)
		The upper half of the admittance chart represents negative susceptance (-jB) which is inductive and the lower half is of the admittance chart is positive susceptance (+jB) which is capacitive.
		This chart is a graphical illustration of the direction of travel along the impedance and admittance coordinates, which results when the particular type of component that is indicated is added to an existing impedance or admittance.
		Now plot these two values on the Smith Chart, as illustrated in Figure 4-44, where at point A, ZL is the normalized complex conjugate of the load impedance, and at point c, ZS* is the normalized complex conjugate of the source impedance.
	www.utdallas.edu /~goeckner/emag2_class/SmithCharts.doc (3173 words)

	[No title] (Site not responding. Last check: 2007-11-03)
		The Smith chart appeared in 1939 (Ref. 1) as a graph-based method of simplifying the complex math (that is, calculations involving variables of the form x + jy) needed to describe the characteristics of microwave components.
		Smith chart inventor Philip H. Smith explained in Ref. 1, “From the time I could operate a slide rule, I’ve been interested in graphical representations of mathematical relationships.” It’s the insights you can derive from the Smith chart’s graphical representations that keep the chart relevant for today’s instrumentation and design-automation applications.
		The Smith chart remains an invaluable aid for a variety of applications, from the design of impedance-matching networks to the determination of the feed-point impedance of an antenna based on a measurement taken at the input of a random length of transmission line (Ref. 7).
	www.web-ee.com /primers/files/SmithCharts/smith_charts.htm (2373 words)

	Smith Chart 3.0
		Smith Chart 3.0 is the newest version of our popular software for transmission line and impedance matching calculations.
		Smith Chart 3.0 is a Windows-compatible software package for the analysis and design of transmission line circuits, impedance matching problems, and transistor amplifier design.
		Smith Chart 3.0 is intended for use by RF and wireless engineers, students, and researchers who need quick and accurate solutions to transmission line, impedance matching, and amplifier design problems.
	www.antennadesignassociates.com /smith.htm (329 words)

	RF Cafe - Smith Chart for Excel (original and new version for entering complex impedances) (Site not responding. Last check: 2007-11-03)
		If a Smith Chart is included in a spreadsheet, it is usually an image pasted in from some other application.
		All that is required is an accurate graphic of a Smith Chart for use as the chart background image, and a rectangular‑to‑cylindrical coordinate conversion.
		Move the chart to a convenient place on the worksheet, and reshape it to as close to a square as possible.
	www.rfcafe.com /business/software/smith_chart_for_excel/smith_chart_for_excel.htm (1597 words)

	A Collection of Smith Chart Resources, page 2
		Phillip Hagar Smith was born in Lexington, Massachusetts on April 29, 1905, to George and Rose Whitney Smith of Scotch and English ancestry.
		Smith, Bell Telephone Laboratories." The footnote referred to a paragraph in the article which began, "There is another effective way for transforming line impedance by means of short line devices...." It was the first published report of Phil's work, work that ultimately led to the creation of the Smith Chart.
		In 1989, the 50th anniversary of the Smith Chart was celebrated at the MTT International Microwave Symposium in Dallas, Texas.
	www.sss-mag.com /smith01.html (2625 words)

	winSMITH: A computerized Smith chart
		The Smith chart is not used by land mobile radio technicians in performing their routine duties.
		Once the circle is placed over the origin of the Smith chart, the input impedance to the pi network will be 50V.
		Now, all we have to do is fine-tune the length of the stub until the circle is positioned directly over the origin on the Smith chart (see Figure 13 on page 29).
	mrtmag.com /mag/radio_winsmith_computerized_smith/index.html (2139 words)

	Family History, Smith Chart 0400 George Smith, Eleanor Ann Adams and ??? (Site not responding. Last check: 2007-11-03)
		This is the last person on ADAMS Chart 0500 that I had to find a marriage for, and I though I would have some problems with this one.
		The idea of these charts is to give the same information that appears in the research we have done and put together in various books.
		If a chart has a box with the standard background it means that as yet I have not put the Chart on the Web.
	web.ukonline.co.uk /the.nook/charts/smith400.htm (421 words)

	Transmission Line Stub Matching Applet (Site not responding. Last check: 2007-11-03)
		The net admittance is the open blue circle at the end of this line; this point should be at the center of the Smith chart for impedance matching.
		Smith chart uses the Smith chart to specify the load admittance.
		Drag the red square on the Smith chart to the point corresponding to the desired admittance.
	home3.netcarrier.com /~chan/EM/PROGRAMS/STUBMATCH (984 words)

	Agilent Technologies \| Educator's Corner - Resource Guide for Engineering Educators \| Smith Chart
		The Smith Chart has circles of constant resistance and arcs of constant reactance.
		The relationship between reflection coefficient and characteristic impedance is shown in the diagram.
		Notice that if you move the reflection coefficient anywhere on this circle, you can see from the waveform at the left that the SWR is the same, only its phase changes.
	www.educatorscorner.com /index.cgi?CONTENT_ID=2482 (720 words)

	Motivational Speaker, Leadership Speaker and Author: Greg Smith
		Greg Smith is the "Captain of the Ship" and CEO of Chart Your Course International, a management development firm that shows organizations how to design high performance organizations that hire, develop, and retain their talent.
		He is both a motivational speaker and organizational development consultant specializing in leadership, talent management, organizational change, employee retention, and teambuilding.
		Chart Your Course International helps organizations with employee retention programs to recruit, manage, retain, and develop the best workforce available by providing cutting-edge strategies, consulting, and training.
	www.chartcourse.com (597 words)

	The Smith Chart
		The resonant frequency of 546.8 MHz indicates that the dipole is cut at about 94% of the notional half wavelength for that frequency.
		There is some variability in the measurement produced by location of the reference plane at the junction of the feed and the dipole; this uncertainty is probably a bit more than the precision on the smith chart plot.
		We notice that at low frequencies (approaching zero) the SMITH chart plot starts from the open circuit point (large resistance and reactance), because the dipole is open-circuit to DC.
	www.eryptick.net /unisold/smith.html (1567 words)

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