1,720,979 research outputs found
Differential interconnects with integrated equalization and common-mode filtering for broadband signal integrity enhancement in high-speed PAM-4 signaling
Full text linkIn high-speed differential interconnects on printed circuit boards, signal integrity (SI) issues arise when neglecting the inherent low-pass characteristic and ubiquitous presence of common-mode noise. This work proposes a novel open-circuited stub equalizer with integrated common-mode filter in order to compensate for the low-pass characteristic while simultaneously suppressing the transmission of unwanted common-mode noise to the receiver. A theoretical analysis of the open-circuited stub equalizer is conducted, and suitable approximations are derived to facilitate equalizer synthesis. Experimental validation is provided by a test structure consisting of a 20 cm microstrip serpentine delay line for which a 4 GHz equalizer is designed. Frequency-domain measurements show a 1-dB bandwidth up to 3.97 GHz with a passband ripple of 0.38 dB for the differential mode and a significant reduction in transmission for the common mode. The resulting SI enhancement increases the possible data rate from 6 Gbps to 20 Gbps using a PAM-4 (pulse amplitude modulation 4-level) modulation scheme
Accurate characterization of radiation from interconnects on interposer at mmWave frequencies
Full text linkAn electromagnetic interference (EMI) assessment of mmWave interposers becomes increasingly important as the need for heterogeneous systems increases. However, the small size and complexity of these platforms make it more difficult to accurately measure them and, thus, a dedicated set-up to isolate the interposer’s emission is required. In this contribution, we first show experimentally that at mmWave frequencies surface waves originating on the interposer test vehicles may interact with the larger measurement board and severely impact the radiation pattern and maximum electric field strength. Second, a simulation study into the exact origins confirms these surface waves indeed to be at the heart of this issue and calls for appropriate measures in interposer design to prevent any EMI complications when integrating this component in a larger system
Accurate Characterization of Radiation from Interconnects on Interposer at mmWave Frequencies
Full text linkCarbon-ink sensing patterns for a contactless smart diaper system
Full text linkTo keep up with the care needs of an increasing population in elderly nursing homes, smart incontinence materials promise to reduce care-taking workload, cut costs and increase user comfort. Therefore, we present two carbon-ink sensors designs that rely on a recently patented differential transmission measurement technique. The proposed sensors are low cost and mass producible, printed directly on the disposable diaper and they interface to the read-out electronics via a reusable flexible strip. In a simulation based on the square resistance of the carbon ink, both designs achieve a similar dynamic range, being most responsive to moisture resistances between 1 kΩ and 100 kΩ. In a practical test on two prototype smart diapers, the designed sensors show promising results by detecting a small volume of only 50 ml, with the two sensors designs being 58% and respectively 55% saturated after adding one litre of moisture
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Design, construction and evaluation of a non-metallic numerically-controlled Cartesian positioning platform for low-interference EMF measurements in 6G and beyond
No full textPackaged cost-effective millimeterwave air-filled SIW components for array feed networks
Full text linkIn this contribution, we investigate the implementation of air-filled substrate-integrated-waveguide (AFSIW) components based on the assembly of multiple standard manufactured single printed circuit boards (PCBs) as a cost-effective, low loss routing alternative for millimeterwave antenna arrays. To this end, a transition from grounded co-planar waveguide (GCPW) to AFSIW is designed, fabricated and measured for integration purposes with active electronics in the n257 5G band. The measured minimal insertion loss equals 0.7 dB around 27 GHz. To further validate our approach, a compact, fully shielded AFSIW filter, including the aforementioned transition, is designed and prototyped. It is shown that the component radiates less than 5% of its power, eliminating most of the spurious radiation from feed networks
Substrate integrated coaxial line millimeterwave components manufactured in standard PCB
Full text linkWe propose a packaging technique for the intricate routing networks in millimeterwave (mmWave) applications based on substrate integrated coaxial lines (SICLs), to eliminate spurious feed network radiation that may influence the antenna array's radiation pattern. Next to a thorough comparison with grounded co-planar waveguides (GCPWs), a coaxial via transition and a novel packaged hybrid coupler are designed, fabricated and measured in the 28 GHz 5G bands. The proposed shielded coaxial via transition from SICL to SICL exhibits a measured insertion loss smaller than 0.7 dB from 24 GHz to 30 GHz, while the measured amplitude imbalance of the hybrid coupler remains below 1 dB and the phase imbalance does not exceed 6
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
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