Welcome to YODA – Open Digital Archive for CSEM
The YODA archive gives access to CSEM's publications, such as its annual reports and brochures. For technical papers such as scientific publications, bibliographic information is provided, along with the full paper where this is possible.
This comprehensive database is part of CSEM's Open Access Publishing policy. For further information refer to the YODA support guide or contact repository@csem.ch.
Recent Submissions
Item Plug-in Plug-Out Multibeam Dielectric Rod Antenna for Target Dedicated mm-Wave RF-WPT Applications(2024-03-17)his paper introduces a beam-adjustable multibeam dielectric rod antenna for mm-wave RF-WPT applications. The unique multibeam setup allows the generation of several ad- justable beams simultaneously. This is conceptualized by utilizing three and five rods to create a beam coverage between −30◦ to 30◦ in the azimuth plane. In the proposed configuration, the peak gain value of each generated beam is 13 dBi at 23.8 GHz. A gain value above 12 dBi is maintained between 20 GHz and 24 GHz. The Rexolite rod is fed through an annular slot fabricated on a Rogers RO4003 substrate. The adjustable nature of this configuration makes the solution agile, with the possibility of adaptation to different scenarios either by altering the number of unit elements employed or their orientation. This capability, together with the low cost of the proposed solution, makes it a promising power delivery solution for Internet of Things (IoT).Item Human physical condition RF sensing at THz range(2016-08-16)The skin response to high radio frequency has been associated with the human physical condition and most prominently with the stress. The objective of this study is to investigate the possibility to detect mental and light physical stress through the measurement of skin reflectance in the mm- wave/sub-THz band. Two frequency bands have been considered, 75-110 GHz (Band-I) and 325-500 GHz (Band-II), while the measurements have been performed in the three different locations, the arm, the dorsal side of the hand and the fingertip. The measurement setup is discussed in detail and the reflectance spectrum is demonstrated. The results illustrate a difference in skin reflectance under rest and stress in Band-II which ranges from 3.5 dB at the finger to 7 dB at the hand. The outcomes of this study indicate the feasibility of stress detection through skin reflectance measurement and serve as a suggestion for deeper exploration of higher frequency bands.Item Novel 2-D Beamsteerable Rectenna with Improved Power Receptivity for mm-Wave RF-WPT Applications(2025-03-30)This paper introduces a novel 2-D beam-steerable rectenna designed for mm-wave RF wireless power transfer (RF-WPT) applications. The 2-D beamsteering capability of the proposed rectenna is achieved by integrating an on-chip 4 × 4 Butler matrix, which is co-integrated with a rectifier array in a 22 nm FD-SOI CMOS, and a leaky wave antenna array. The proposed solution incorporates dual rectifier units simultaneously to enhance the receiver’s power receptivity. In this manner, the rectenna is capable of receiving power from the same direction while taking advantage of frequency diversity. This is accomplished using the novel integration scheme of the single leaky wave array antenna with two rectifier units. The proposed solution maintains the system’s compactness and reduces the overall cost while offering a fully passive 2-D beam scanning for the receiver unit. These merits make the proposed solution promising for RF-WPT applications in the Internet of Things (IoT) ecosystem.Item Feasibility of Remote Vital Signs Sensing with a mm-Wave CW Reflectometer(2018-04-24)Remote monitoring of vital signs (VS) is an emerging technology with a vast number of possible uses from hospital care to the automotive industry and assisting living environments. Radio-frequency (RF) sensing enables the remote and unobtrusive measurement of VS without the need to wear any special device or clothing and under any lighting conditions. A demonstrator of RF vital signs sensing was designed and prototyped based on a continuous wave reflectometer implemented on a Software Defined Radio platform. The sensor operates at 110 GHz. The feasibility of remote respiration and heart rate (HR) monitoring was investigated. The breathing pattern was found to affect significantly the reliability of the HR estimation. The potential of remote VS sensing at distances up to 10 m was theoretically explored and confirmed.Item Hedgehog Shell: Multibeam DRA with 2-D Beamsteering for mm-Wave Applications(2025-03-30)This paper investigates a low-cost method to form a multibeam antenna with 2-D beamsteering capability. The simple feeding method employed in this solution enables the dielectric rod antennas to generate multiple beams in the intended direction simultaneously. In this manner, a multi-fixed-beam system is created without the need for a beamforming unit, which reduces the complexity of the final system architecture. Furthermore, a sensitivity analysis of the dielectric rod is performed, taking into account variations in critical design parameters and the per- mittivity of the rod. Different fabrication methods and low-loss materials that can be used for rod manufacturing are introduced, and the permittivity of these materials is characterized using the Nicolson-Ross-Weir (NRW) method. By doing so, our study not only presents a practical multibeam antenna formulation strat- egy but also reports appropriate materials and manufacturing processes that can be employed in the manufacturing of rod antennas.
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