Elektromagnetische Strahlung und Antennen

Zinke, Otto; Brunswig, Heinrich

doi:10.1007/978-3-642-57131-2_7

Cited by 3 publications

(3 citation statements)

References 38 publications

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“…where L line is the length, Z L is the characteristic impedance and γ is the propagation constant of the line [28], which are the same for both lines because of their identical geometry. Z 0 = 50 Ω is the reference impedance of the used measurement or simulation ports.…”

Section: B De-embedding Algorithmmentioning

confidence: 99%

On the influence of vias on a PCB power-bus

Heinrich

Dickmann

2008

2008 International Symposium on Electromagnetic Compatibility - EMC Europe

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In this paper, a method for the investigation of the influence of a through-hole via on a printed circuit board power-bus is presented. Therefore based on an introduced via model for a through-hole via its scattering parameters are extracted using a de-embedding algorithm. After the following calculation of the via model elements with the two-port theory, the extracted impedances are inserted in a known formula for the power-bus impedance. In addition, it is shown how the signal return current acts as an excitation source of the waveguide modes within the power-bus.

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Section: B De-embedding Algorithmmentioning

confidence: 99%

On the influence of vias on a PCB power-bus

Heinrich

Dickmann

2008

2008 International Symposium on Electromagnetic Compatibility - EMC Europe

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“…We therefore opted for a probe which operates like an exponential TML. It is possible to approximate exponential TMLs by a series of lumped LC-pi-sections [15,16]. We designed two different probes, each consisting of five pi-sections but with different centre frequencies f c and useful bandwidths Δf.…”

Section: Wideband Probementioning

confidence: 99%

A no-tune no-match wideband probe for nuclear quadrupole resonance spectroscopy in the VHF range

Scharfetter¹,

Petrovic²,

Eggenhofer³

et al. 2014

Meas. Sci. Technol.

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Nuclear quadrupole resonance (NQR) spectroscopy is a method for the characterization of chemical compounds containing so-called quadrupolar nuclei. Similar to nuclear magnetic resonance (NMR), the sample under investigation is irradiated with strong radiofrequency (RF) pulses, which stimulate the emission of weak RF signals from the quadrupolar nuclei. The signals are then amplified and Fourier transformed so as to obtain a spectrum. In principle, narrowband NQR spectra can be measured with NMR spectrometers. However, pure NQR signals require the absence of a static magnetic field and several special applications require the characterization of a substance over a large bandwidth, e.g. 50–100% of the central frequency, which is hardly possible with standard NMR equipment. Dedicated zero-field NQR equipment is not widespread and current concepts employ resonating probes which are tuned and matched over a wide range by using mechanical capacitors driven by stepper motors. While providing the highest signal to noise ratio (SNR) such probes are slow in operation and can only be operated from dedicated NMR consoles. We developed a low-cost NQR wideband probe without tuning and matching for applications in the very high frequency (VHF) range below 300 MHz. The probe coil was realized as part of a reactive network which approximates an exponential transmission line. The input reflection coefficient of the two developed prototype probe coils is ≤ 20 dB between 90–145 MHz and 74.5–99.5 MHz, respectively. Two wideband NQR spectra of published test substances were acquired with an SNR of better than 20 dB after sufficient averaging. The measured signals and the SNR correspond very well to the theoretically expected values and demonstrate the feasibility of the method. Because there is no need for tuning and matching, our probes can be operated easily from any available NMR console.

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“…They can be calculated with analytic formulas for the assumed quasi-TEM propagation on the microstrip lines in the frequency range of interest (Gupta, 1979), (Zinke, 2000).…”

Section: De-embedding Algorithmmentioning

confidence: 99%

Coupling between Vias and the PCB Power-Bus

Heinrich

Dickmann

2009

Adv. Radio Sci.

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Abstract. In this paper, a method for the extraction of data for a through-hole vertical interconnect access (via) on a printed circuit board (PCB) is presented. It uses a matrix de-embedding algorithm and two-port theory to extract the elements of an assumed lumped via model. After that the influence of the via on the power-bus impedance and the coupling between the via and the power-bus are described using this model.

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Elektromagnetische Strahlung und Antennen

Cited by 3 publications

References 38 publications

On the influence of vias on a PCB power-bus

On the influence of vias on a PCB power-bus

A no-tune no-match wideband probe for nuclear quadrupole resonance spectroscopy in the VHF range

Coupling between Vias and the PCB Power-Bus

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