Lehrbuch der Hochfrequenztechnik

Zinke, Otto; Brunswig, Heinrich

doi:10.1007/978-3-662-00476-0

Cited by 27 publications

(8 citation statements)

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“…This does not however mean that the contribution of higher order multipoles to the radiated power is significant. As demonstrated by Harrington in [7] and later reproduced by Zinke and Brunswig in [9], upon expanding the field radiated by an arbitrary antenna in spherical coordinates, the contribution of higher-order multipoles to the overall radiated power remains negligible. Field strengths arising from higher expansion terms mainly contribute to the reactive power for normal gain antennas.…”

Section: Decomposition Of the Radiated Field Into Radiations From Elementioning

confidence: 95%

“…3. The resonant character of the antenna permits considering only contributions from dipoles, since higher order multipoles do not play a major role [7][8][9]. In fact, for normal-gain radiators the contribution of higher order multipoles to the radiating power is negligibly small, less than 1% [8].…”

Section: Decomposition Of the Radiated Field Into Radiations From Elementioning

confidence: 99%

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Description of Electrically Small Resonant Antennas by Electric and Magnetic Dipoles

Pouhè¹,

Kamga²,

Moenich³

2011

PIER B

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Abstract-A new kind of field representation on the far field sphere is presented. This representation is based upon the polarisation states of the field. Polarisation states can easily be obtained upon determining the peculiar loci in the field. Depending on the polarisation state of the field, it is demonstrated that, either one of the magnetic or the electric dipole moments is dominant. Subsequently, criteria which may be applied to determine which dipole moment is responsible for the main radiation are derived. This characterization scheme which is a good figure of merit for an antenna designer may be useful in mobile communications especially in identifying possible adverse effects of RF fields on human health. The approach is also helpful for EMC engineers seeking to characterize and identify radiation sources of equipment under test.

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Section: Decomposition Of the Radiated Field Into Radiations From Elementioning

confidence: 95%

Section: Decomposition Of the Radiated Field Into Radiations From Elementioning

confidence: 99%

Description of Electrically Small Resonant Antennas by Electric and Magnetic Dipoles

Pouhè¹,

Kamga²,

Moenich³

2011

PIER B

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“…Winding Pack Measurements were performed at frequencies of 50 Hz to 30 kHz using an RLC-meter at amplitude of 5 V. Magnitude and M phase angle of the measured impedance are compared with calculated results from an equivalent circuit. We modeled the impedance of a winding pack by a parallel resonance circuit, where a capacitance is in parallel to an inductance in series with a resistance, where the impedance is given by [5] . ) (…”

Section: Impedance Spectrum Testmentioning

confidence: 99%

Comparative Analysis of Impulse and Impedance Tests to Detect Short Circuits Within the W7-X Magnets

Ehmler

Fillunger

Baldzuhn

et al. 2006

IEEE Trans. Appl. Supercond.

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Abstract-The magnet system of the Wendelstein 7-X stellarator (W7-X) consists of 50 non-planar and 20 planar coils. In particular, the winding packs of the non-planar coils are densely packed and compressed in the area of inter-layer joints and coil terminations, which brings some risk of inter-turn and inter-layer short circuits.The paper describes methods deducted from impulse and ac tests performed on the coils, which enable demonstrating the absence of short circuits and weak points of low inter-layer insulation resistance. In the impulse test, frequency and damping are compared for coils with and without short circuits and coils with an external low resistance bypass. With ac voltage, a drastically reduced impedance clearly indicates a short circuit. Therefore both tests represent excellent QA (quality assurance) tools for checking the uniformity of the electromagnetic performance of a serial production of magnet coils.

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“…Diese Vorgehensweise ist zulässig, sofern der Abstand AI zwischen Deckel und Leitung mindestens viermal größer als die Substratdicke h ist, also AI > 4-A [3]. Der Eingangsleitwert an der Speisestelle ist Y cia -Y a + Y,f.…”

Section: Impedanzberechnungunclassified

Numerische Analyse aperturgekoppelter Streifenleitungsantennen mit MAFIA

Henze¹,

Shtrikman²,

Früchting³

1998

Frequenz

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ÜbersichtStreifenleitungs-und Planarantennen werden für Radar-und Mobilfunkanwendungen weitverbreitet eingesetzt.genaue Berechnung der Antenneneigenschaften ist nur mit effizienten numerischen Verfahren möglich, die ein wertvolles Werkzeug bei der Antennenentwicklung darstellen. Bne aperturgekoppelte Streifenleitungsantenne für das X-Band (9,6 GHz) wurde mit dem Programmpaket MAFIA, basierend auf dem FIT-Algorithmus (Finite /ntegration Technique), simuliert. Die Ergebnisse wurden mit einer Berechnung nach der Integralgleichungs-und Momentenmethode verglichen. Die Simulationsergebnisse zeigen eine sehr gute Übereinstimmung mit den Messungen des Reflexionsfaktors und des Femfeldes der Antenne, sowie mit Ergebnissen aus der kombinierten Integralgleichungs-und Momentenmethode. AbstractMicrostrip and planar antennas are widely used in the field of mobile communication and radar applications. For an accurate calculation of the antenna properties efficient numerical techniques are used. These are very valuable design tools. An aperture coupled microstrip antenna for applications in the X-Band (9.6 GHz) is simulated by means of MAFIA using the FIT-Algorithm (Finite Integration Technique). The results are compared with a simulation based on a combination of the integral equation method and the method of moments. The simulation results show very good agreement both with measurements of the reflection coefficient and the farfield of the antenna, and with results from the combined method of integral equation and method of moments. Für die Dokumentation Streifenleitungsantennen / MAFIA / Finite Integration Technique / Antennensimulation Frequenz 52(1998) 1-2

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Lehrbuch der Hochfrequenztechnik

Cited by 27 publications

References 0 publications

Description of Electrically Small Resonant Antennas by Electric and Magnetic Dipoles

Description of Electrically Small Resonant Antennas by Electric and Magnetic Dipoles

Comparative Analysis of Impulse and Impedance Tests to Detect Short Circuits Within the W7-X Magnets

Numerische Analyse aperturgekoppelter Streifenleitungsantennen mit MAFIA

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