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	Inductive coupling - Wikipedia, the free encyclopedia
		The two devices may be physically contained in a single unit, as in the primary and secondary sides of a transformer, or may be separated as in the antennae on a transmitter and a receiver.
		An inductively coupled transponder comprises an electronic data carrying device, usually a single microchip, and a large coil that functions as an antenna.
		Inductively coupled transponders are almost always operated passively.
	en.wikipedia.org /wiki/Inductive_coupling (213 words)

	[No title] (Site not responding. Last check: 2007-10-18)
		The inductive coupling is proportional to the length of the bond wires, in which longer bond wires have greater inductive coupling.
		Thus, the inverted signals are coupled to the non-inverted inputs and the non-inverted signals are coupled to the inverted inputs.
		An apparatus as recited in claim 22 further comprising a pair of connectors coupled between the first device and the second device, wherein a second plurality of electrical conductors are coupled between the pair of connectors, and wherein alternating pairs of electrical conductors are reversed.
	www.wipo.int /cgi-pct/guest/getbykey5?KEY=01/97391.011220&ELEMENT_SET=DECL (3660 words)

	UofO Lewis Center for Neuroimaging
		Inductively coupled coils have several advantages over capacitively coupled coils, and are particularly useful in situations where making direct electrical connections to a coil is undesirable.
		Introduction: Inductive coupling is an RF probe design technique in which the probe consists of two coils coupled by their mutual inductance, without direct electrical connection between them.
		The coils included an inductively coupled coil with no detuning elements, an inductively coupled coil with crossed diodes for passive detuning, a capacitively coupled coil with pin diode detuning, and an actively detuned inductively coupled coil.
	lcni.uoregon.edu /InductiveCoupling.html (716 words)

	Tiresias - WGHI - Working Group on Visual Impairment
		When coupled to a hearing aid the acoustic coupling, for BTE aids at least, is far from being sealedand the deficiencies in the low frequencies is carried through to the response at the ear of the listener.
		When inductive coupling is used in association with additional receiving amplification clearly a hard of hearing telephone subscriber would experience considerable assistance, providing that the inductive input circuit can handle the large signals.
		Both acoustic and inductive coupling methods provide for a range of OLR that is wider than the OLR of the 1 metre acoustic path, with or without an aid, with the exception of the ITE aid coupled inductively.
	www.tiresias.org /wghi/audio.htm (4204 words)

	[No title] (Site not responding. Last check: 2007-10-18)
		Thus, an inductive coupling can be formed between the coil unit and the outer region of the coin selectively, and the coin validity can be tested by determining whether the inductive coupling has predetermined characteristics corresponding to distinctive characteristics for said outer region for a true coin.
		the coils is such that the inductive coupling between the coin and the coils is restricted substantially only to the second, outer region 22 of the coin 8, with no significant coupling occurring with the first inner region 21.
		A method according to claim 1 including forming the inductive coupling between the coil unit and the outer region of the coin, and determining whether the inductive coupling has predetermined characteristics corresponding to said distinctive characteristics for the outer region.
	www.wipo.int /cgi-pct/guest/getbykey5?KEY=99/23615.990514&ELEMENT_SET=DECL (4225 words)

	Tiresias - Guidelines
		Also, acoustic coupling to hearing aids is quite successful in many instances, albeit there is some degrading of the frequency response of the overall connection due to the characteristics of typical telephone earphones that are designed to work into a 'closed cavity', such as an ear.
		The inductive coupling input sensitivity (10 mA/m) is specified at a known air to air gain setting (40 dB) and a known output sound level (95 dB).
		Note: The sensitivity of the inductive input in the absence of shaping circuits is assumed to be proportional to frequency.
	www.tiresias.org /wghi/hearing.htm (3061 words)

	An Analysis of Inductive Coupling and Interference Issues (Site not responding. Last check: 2007-10-18)
		For telecoil users, it is thus very desirable for the inductive field originating in the telephone to be strong so that the telecoil can be less sensitive to EMI from undesired sources that may exist either in the environment or in other parts of the telephone.
		Requiring even stronger inductive fields than that required by Part 68 would greatly improve the usability even of phones that have sources of strong interference in the phone that are separate from the audio components.
		Inductive EMI/non-RF interference is generated by a continually changing or pulsating current anywhere in the phone.
	www.shhh.org /html/TC05.html (2382 words)

	[No title] (Site not responding. Last check: 2007-10-18)
		It was soon found that this inductive coupling facility could also be used to listen to the audio signals from a telephone earphone due to the presence of an alternating magnetic field around it and associated with the received signal.
		Inductive Coupling, Employing a Horizontal Induction Loop This loop is installed in the floor-surface before the window, or against the ceiling of the costumer hall.
		Inductive Coupling Employing a Loop in a Vertical Plane In this solution an induction coil in a pad of limited dimensions (30 X 20 cm) is used.
	www.stakes.fi /cost219/HAGUE93.DOC (17603 words)

	[No title]
		Frequently, such couplings are described as “inductive” or “capacitive”, a nomenclature referring to the sign of the coupling impedance type (positive for inductive, negative for capacitive).
		If the coupling between resonators is a resonant circuit, energy passing through the coupling will be phase-shifted and amplitude adjusted, depending on the resonant frequency and magnitude of the coupling.
		Of course, the coupling magnitude and the coupling phase are both affected by adjustment of the coupling resonant frequency.
	www.rsmicro.com /5-97tec.htm (666 words)

	Inductive couplings (Site not responding. Last check: 2007-10-18)
		is a user-defined identifier of the specified inductive coupling.
		for the coupling factor of the inductive coupling.
		Three terminals representing closed loops with a mutual inductive coupling inside the second loop and another one between the second and third loop may be specified as
	virtual.cvut.cz /dyn/manual/node86.html (127 words)

	Electromagnetic Interference - Siemon
		Capacitive coupling is represented in Figure 2 as a simplified, discrete model of distributed coupling.
		Inductive coupling occurs via the mutual inductance (Lmutual) between two or more circuits or channels as represented by the simplified model shown in Figure 3.
		In order to reduce the effect of inductive coupling between circuits, it is important to maintain cable geometry along the entire channel length and to keep adequate separation between circuits.
	www.siemon.com /uk/white_papers/02-03-22-emi.asp (1187 words)

	Contactless Rotary Electrical Couplings
		The rotary inductive coupling is shown in the lower half of the photograph.
		Figure 2 shows a simplified cross section of a typical inductive rotary coupling between a stationary circuit and a rotating circuit mounted on a motor-driven shaft.
		This Inductive Rotary Coupling resembles a conventional stationary transformer, except that one coil rotates with a shaft that passes through the middle, and the core is shaped to accommodate the rotating parts.
	www.nasatech.com /Briefs/Mar03/ARC12072.html (602 words)

	[No title]
		The proportion of coupling which is capacitive is dependent upon the diameters of the obstacles.
		In this case, the main coupling between inverted lines is essentially capacitive, and the lower stopband slope of the filter is emphasized, at the expense of the upper slope.
		The inductive elements are generally of high unloaded Q, with a value related to the distance below the cutoff frequency of what would be the dominant propagating mode in an unperturbed cross-section of waveguide shaped like the filter interior.
	www.rsmicro.com /2-97TEC.HTM (705 words)

	Metrotech - Glossary (Site not responding. Last check: 2007-10-18)
		Coupling of the signal from the transmitter to the receiver through the air rather than through the target line to be located.
		Air coupling may interfere with the signal from the line and cause a false indication of the location.
		Since direct connections or inductive clamps are not feasible, indirect inductive coupling at 82 kHz is chosen.
	www.metrotech.com /glossary.asp (2663 words)

	Biometrics Products Solutions
		Near-field coupling techniques are generally applied to RFID systems operating in the LF and HF bands with relatively short reading distances well within the radian sphere defined by l /2 p, while irradiative far-field coupling is applicable to potentially longer read range UHF and microwave RFID systems.
		The tag's coupling element is an inductor comprising a planar antenna coil and an on-chip tuning capacitor, which are connected together and designed to resonate at a particular reader system operating frequency such as 13.56Mhz or 915.2Mhz.
		Inductive coupling is a means to transmit RF energy via a magnetic field.
	www.itanswers.co.za /RFID.htm (802 words)

	Conductive coupling - Wikipedia, the free encyclopedia
		Conductive coupling: Energy transfer achieved by means of physical contact, i.e., coupling other than inductive or capacitive coupling.
		Note 1: Conductive coupling may be achieved by wire, resistor, or common terminal, such as a binding post or metallic bonding.
		Note 2: Conductive coupling passes the full spectrum of frequencies, including dc.
	en.wikipedia.org /wiki/Conductive_coupling (87 words)

	(EMC) The Hidden Schematic: EMC Threats in Medical Power Supplies (MEM archive, Sep 01)
		Capacitive and inductive coupling is a more significant factor in power supplies than on digital and analog circuit boards, because of the larger components standing off the board and because of the power-level currents and voltages.
		The inductive coupling paths are primarily magnetic field fringing from inductors and transformers, followed by coupling directly off the switched power-current lines.
		The principal capacitive coupling paths are the nodes connected to the high dv/dt elements, notably the switch and the bridge rectifier.
	www.devicelink.com /mem/archive/01/09/009.html (2453 words)

	Definition: inductive coupling
		inductive coupling: The transfer of energy from one circuit to another by virtue of the mutual inductance between the circuits.
		Note 1: Inductive coupling may be deliberate and desired (as in an antenna coupler) or may be undesired (as in power line inductive coupling into telephone lines).
		Note 2: Capacitive coupling favors transfer of higher frequency components, whereas inductive coupling favors transfer of lower frequency components.
	www.its.bldrdoc.gov /projects/devglossary/_inductive_coupling.html (83 words)

	Inductive Coupling of Tuned Circuits
		The coupling constant is concerned with how the lines of magnetic force produced by one coil interact with another coil, and hence the coupling constant between two air spaced coils depends only on their physical size and disposition in space.
		The mutual inductance coupling ensures that everything critical to the operation of the spark transmitter (or Tesla coil) is dependent on just about everything else, and that is why trying to find the global optimisation for a Tesla coil to give the biggest spark for a given input power is so very difficult.
		All of which goes to show how very complicated the inductively coupled spark transmitter (or Tesla coil) really is. It's a nice demonstration of the fact that there is not necessarily a direct correlation between the number of components in a circuit and its complexity of operation.
	home.freeuk.net /dunckx/wireless/inductive/inductive.html (1648 words)

	[No title]
		The latter consists of a coil coupled to the primary and placed in series with the secondary inductance; the secondary condenser is cut out of the circuit when the untuned secondary is used.
		The tickler is to be connected in series with the plate circuit of the audion and is coupled to the secondary at the short wave end of the secondary coil to provide sufficient coupling to the secondary on short waves.
		The poing of minimum coupling of this receiver is between 5 and 20 degrees on the coupling scale.
	www.mines.uidaho.edu /ftp/pub/Glowbugs/Manuals/SE1220/se1220.nro (4013 words)

	[No title]
		Inductive coupling, capacitive coupling, and conducted paths are described.
		From the graph it can be seen that, for this situation of inductive coupling, the magnitude of the voltage across an insulated joint is approximately the sum of the magnitudes of the rail-to-ground voltages on each side.
		It is not uncommon for the 60 Hz component of interference to couple through an inductive path from the transmission line while the 180 Hz component of interference couples conductively from the distribution line and the earth.
	www.arema.org /comm/c38/AC_Power_Interference-Railroad_Systems.doc (3734 words)

	Lesson 2- Signal Intergrity in Digital Circuits
		Inductive coupling is more difficult to visualise than mutual capacitance: there is no real "magnetic screen", but the designer can manage to avoid transformer-like structures, which exhibit high mutual inductance.
		Independent ground returns on pins close to signals, minimises the inductive coupling, while using the same pin for return currents from several signals creates nested loops with high mutual inductance, as shown in figure 2.10.
		Both the inductive and the capacitive terms of crosstalk have a duration shorter than 2 tP ; if the logic circuits are not sensitive to logic state changes with duration shorter than 2 tP, crosstalk pulse - even if present - is blocked before entering the logic devices.
	www.bolton.ac.uk /mind/corep/sig-int/sig-int-2/lesson2.html (1872 words)

	noisepage5
		Coupling comes from nearby sources producing magnetic or electric fields.
		The biggest source of inductive and capacitive coupling interference comes from the pulsed magnet producing a noise signal with a peak in the fournien transform near 40 Hz (see Magnetic Field Profile).
		Because our experiments are placed inside pulsed field magnets, this is always huge and one of the most difficult to overcome especially in the case of low resistance measurements.
	www.lanl.gov /mst/nhmfl/users/pages/noisepage5.htm (184 words)

	IM tutorial
		Today, the improvement of inductive modem technology provides a solution that is convenient, economical, reliable, and flexible; allowing up to 100 instruments to be positioned or repositioned at any depth (Figure 1).
		Inductive Modems or Inductively Coupled Modems because they employ transformers to couple data to the mooring cable.
		It allows a variety of serial instruments to be coupled inductively and addressed (polled) as one of up to 100 units on the mooring cable.
	www.seabird.com /technical_references/IMtutorialR2.htm (2615 words)

	THE EH ANALYZED
		The coupled coil configuration is the same as the "DLA" antenna that has been written up previously-the variable coupling curves are similar to the DLA data and it is hoped that the changes in the series of tuning curves versus coupling throws some light on the DLA operation.
		This makes sense since mutual coupling increases the voltage in the one and decreases the voltage in the other, as the Isotrons and coils are connected in opposite directions across the cable.
		The inductive coupling between Isotrons gives 3 or 4 chances to be matched, with different voltages between the cylinders or from the cylinders to ground.
	www.antennex.com /hws/ws1201/theeh.html (3058 words)

	ICC datasheet
		The ICC is used in applications where the plastic-jacketed wire termination is grounded to seawater (at a chain, for example).
		Surface Inductive Modem (SIM), housed in a buoy or on land.
		Inductive Cable Coupler (ICC), which links the underwater IM and the SIM for typical buoy applications.
	www.seabird.com /products/spec_sheets/ICCdata.htm (436 words)

	[No title] (Site not responding. Last check: 2007-10-18)
		Transfer of energy from the plate circuit to the grid circuit of a vacuum tube by means of induction.
		Transfer of energy from the output circuit to the input circuit of an amplifying device through an inductor, or by means of inductive coupling.
		] Effect arising from the characteristics and inductive relations of electric supply and communications systems of such character and magnitude as would prevent the communications circuits from rendering service satisfactorily and economically if methods of inductive coordination were not applied.
	www.accessscience.com /Dictionary/I/I8/DictI8.html (2559 words)

	Re: Inductive coupling (Site not responding. Last check: 2007-10-18)
		Thus, to get maximim coupling, the coils have to share the same axis, or stacked together as if wound on one form.
		There will be a position whereby the degree of the coupling is such that you could get an improvement by either moving the coils back towards each other, or having them side-by-side, like binoculars.
		Keep in mind that the tighter the coupling, the more of a loading the tuned circuits have, and this broadens their tuning curve, or lowers their Q rating.
	www.midnightscience.com /_web/000018bb.htm (197 words)

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