Wyniki wyszukiwania - BazTech

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Bezprzewodowe (OTA) testowanie modułów AiP : wyzwania i możliwości

Dąbrowiecki Krzysztof

Elektronika : konstrukcje, technologie, zastosowania

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2021

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Vol. 62, nr 8

31--37

PL

W artykule przedstawiono tendencje i prognozy w rozwoju pakietów antenowych przeznaczonych dla technologii 5G. Omówiono wyzwania i możliwości dotyczące testowania modułów AiP (Antenna in Package). Przedstawiono koncepcję i prototyp testowania układów antenowych wykorzystujące linie transmisyjne umieszczone w reaktywnym bliskim zakresie promieniowania dla częstotliwości 5,8 GHz. Linie transmisyjne badanego promiennika są tak zaprojektowane, aby uniknąć rozstrojenia impedancji punktu zasilania anteny. Niepożądane sprzężenie z sąsiednimi antenami jest tłumione o więcej niż 10 dB, dlatego możliwe staje się testowanie równocześnie kilku anten. Ponadto artykuł przedstawia prototypowe rozwiązanie testowania modułu antenowego (AiP) o częstotliwości 28 GHz z wykorzystaniem systemu ATE V93000 Wave Scale Millimeter CardCage.

EN

The article presents trends and forecasts in the development of antenna packages for 5G technology. The challenges and opportunities for testing AiP (Antenna in Package) modules were discussed. The concept and prototype of testing antenna systems using transmission lines located in the reactive nearfield for the frequency of 5.8 GHz are presented. The transmission line probes are designed to avoid de-tuning of the antenna feed-point impedance. Unwanted coupling to neighboring antennas is suppressed by more than 10 dB therefore it becomes possible to test several antennas simultaneously. In addition, the article presents a solution for testing a 28 GHz AiP module using the ATE V93000 Wave Scale Millimeter Card Cage system.

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The influence of the frequency‑dependent spherical‑wave effect on the near‑surface attenuation estimation

Ji Yongzhen, Wang Shangxu, Yuan Sanyi, Yan Binpeng

Acta Geophysica

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2019

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Vol. 67, no. 2

577--587

EN

The knowledge of Q is desirable for improving seismic resolution, facilitating amplitude analysis and seismic interpretation. The most commonly used methods for Q estimation are the frequency-spectrum-based methods. Generally, these methods are based on the plane wave theory assuming that the transmission/reflection loss is frequency independent. This assumption is reasonable in the far-field situation and makes the transmission/reflection coefficient irrelevant with the Q estimation result. However, in the near-surface context, this assumption is invalid because the seismic wave propagates in the form of spherical wave in the real seismic surveys and the spherical-wave transmission/reflection coefficient is frequency dependent. As a result, deviation will exist. In this paper, the influence of the spherical-wave effect on the Q estimation in the near-surface context was proved in both synthetic data and field data for the first time, and it was found that the deviation due to the sphericalwave effect is of order comparable to the intrinsic attenuation. The compensation method based on the forward modeling is then proposed to correct this deviation, and the effectiveness of the proposed method is proved by the reasonable estimated results of both synthetic data and field data example. These results raise caution for the interpretation of the extracted Q in the near-surface context if they do not account for the spherical-wave effect and point to the necessity of incorporating a frequency-dependent term in the frequency-spectrum-based method when applied to the Q estimation in the near surface.

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Numerical simulations of blast loads from near-field ground explosions in ai

Dobrociński S., Flis L.

Studia Geotechnica et Mechanica

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2015

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Vol. 37, nr 4

11--17

EN

Numerical simulations of air blast loading in the near-field acting on the ground have been performed. A simplified blast model based on empirical blast loading data representing spherical and hemispherical explosive shapes has been simulated. Conwep is an implementation of the empirical blast models presented by Kingery and Bulmash, which is also implemented in the commercial code LS-DYNA based on work done by Rahnders-Pehrson and Bannister. This makes it possible to simulate blast loads acting on structures representing spherical and hemispherical explosive shapes of TNT with reasonable computational effort as an alternative to the SPH and Eulerian model. The CPU time for the simplified blast model is however considerably shorter and may still be useful in time consuming concept studies. Reasonable numerical results using reasonable model sizes can be achieved not only for modelling near-field explosions in air but most areas of geotechnical. Calculation was compared with blast SPH and Eulerian model.

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Influence of surface plasmon wave interference on near-field imaging on metal nanostructures with apertured probe

Yang Y., Sun Z.

Optica Applicata

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2013

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Vol. 43, nr 3

615--626

EN

We numerically studied artifact issues on near-field imaging of field intensity on metal nanostruc-tures (isolated ridges and slits in a continuous film) with an apertured probe. It is shown for the latter case that the interaction between neighboring slits via propagating surface plasmon waves (e.g., surface plasmon wave interferences) makes the probe-imaged field intensity highly condi-tional in reflection of the unperturbed field. As surface plasmon behaviors and probe imaging processes are polarization-sensitive and the field components are correlated, a model analysis of the partial field components elucidates their relations, which can help to derive the unperturbed near-field image from the probed one.

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Pomiary charakterystyk anten w strefie bliskiej

Pyszak S., Wnuk M.

Elektronika : konstrukcje, technologie, zastosowania

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2007

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Vol. 48, nr 12

80-85

PL

Przedstawiono podstawy teoretyczne pomiarów anten w strefie bliskiej. Omówiono zaprojektowane, zestawione i uruchomione stanowisko do pomiaru anten w polu bliskim metodą planarną, kartezjańską z wykorzystaniem komory bezodbiciowej. Uzyskane dane pomiarowe przeliczono w specjalnie opracowanym w środowisku Matlab programie matematycznym. Obliczone wartości pola w strefie dalekiej zostały przekształcone do postaci umożliwiającej prezentację w formie przekroju przestrzennej charakterystyki promieniowania anteny. Wyliczone charakterystyki promieniowania zostały porównane do wyników pomiarów przeprowadzonych w polu dalekim. Uzyskano dużą zgodność wyników.

EN

The paper presents the theory basis of antenna radiation pattern measurements in the near-field. The designed and implemented in ane-choic chamber laboratory stand for antenna pattern measurements in the near field is described. For antenna pattern calculation the "planar" and cartesian method is used. The obtained measurements results are recalculated using Matlab specialized software. The calculated field values in the far field are converted into sectional view of three-dimensional antenna pattern form. The calculated antenna patterns basing on measurements in near-field are compared with the result of antenna pattern measurements in far-field. The big correlation of results is obtained.