The Experts below are selected from a list of 81 Experts worldwide ranked by ideXlab platform
Cyril Luxey - One of the best experts on this subject based on the ideXlab platform.
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chip to chip switched beam 60 ghz circular patch planar antenna array and pattern considerations
IEEE Transactions on Antennas and Propagation, 2018Co-Authors: Prabhat Baniya, Aimeric Bisognin, Kathleen L Melde, Cyril LuxeyAbstract:A 60 GHz switched beam chip-to-chip antenna array is introduced. The array consists of four center fed circular patch elements with side vias in a $2{\times} 2$ grid arrangement forming a planar array. The array is designed to fit on a typical multicore chip for reconfigurable interchip wireless communication. The array main beam is switched by changing the interelement phase shifts in the azimuth plane. The switching of the main beam is analyzed and verified through full-wave simulation. The design presented is an improvement over a previous design of a two-element antenna array. The Friis transmission Equation with polarization components taken into account is used to model the interchip wireless link. To verify the model, a transmission coefficient measurement is made between a pair of the two-element arrays separated by a 10 mm distance. Both simulated and measured radiation patterns of the two-element array are presented for use in the Friis Equation to calculate the transmission coefficients. Full-wave simulation of the array pair is also performed. The calculated results obtained from the Friis model agree well with both the measured and full-wave simulation results. The Friis model is used to calculate both signal and interference levels.
Lijun Chen - One of the best experts on this subject based on the ideXlab platform.
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placement of multiple rfid reader antennas to alleviate the negative effect of tag orientation
International Conference on Parallel and Distributed Systems, 2012Co-Authors: Jia Liu, Lijun ChenAbstract:One primary issue which hinders large-scale Radio Frequency Identification (RFID) applications is the imperfect read rate. According to Friis Equation and experiments, we find that the dipole tag's orientation plays a significant role in read performance both in theory and practice. In this paper, we consider how to deploy multiple reader antennas to alleviate the negative effect caused by uncontrollable tag orientations in item-level applications. Different from previous work, we expand the candidate antenna positions from the portal to real three dimensional space and establish two estimation functions based on sphere coverage models under different polarized environment. Meanwhile, we provide an improved enumeration scheme with leaping and layering search strategies based on sphere quadtree (SQT) model to find optimized deployment.
Prabhat Baniya - One of the best experts on this subject based on the ideXlab platform.
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chip to chip switched beam 60 ghz circular patch planar antenna array and pattern considerations
IEEE Transactions on Antennas and Propagation, 2018Co-Authors: Prabhat Baniya, Aimeric Bisognin, Kathleen L Melde, Cyril LuxeyAbstract:A 60 GHz switched beam chip-to-chip antenna array is introduced. The array consists of four center fed circular patch elements with side vias in a $2{\times} 2$ grid arrangement forming a planar array. The array is designed to fit on a typical multicore chip for reconfigurable interchip wireless communication. The array main beam is switched by changing the interelement phase shifts in the azimuth plane. The switching of the main beam is analyzed and verified through full-wave simulation. The design presented is an improvement over a previous design of a two-element antenna array. The Friis transmission Equation with polarization components taken into account is used to model the interchip wireless link. To verify the model, a transmission coefficient measurement is made between a pair of the two-element arrays separated by a 10 mm distance. Both simulated and measured radiation patterns of the two-element array are presented for use in the Friis Equation to calculate the transmission coefficients. Full-wave simulation of the array pair is also performed. The calculated results obtained from the Friis model agree well with both the measured and full-wave simulation results. The Friis model is used to calculate both signal and interference levels.
Woojin Byun - One of the best experts on this subject based on the ideXlab platform.
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generalized Friis transmission Equation for orbital angular momentum radios
IEEE Transactions on Antennas and Propagation, 2019Co-Authors: Yong Heui Cho, Woojin ByunAbstract:Generalization of a Friis transmission Equation for orbital angular momentum (OAM) radios is rigorously formulated using the Lorentz reciprocity theorem and a near-and-far-field convolution integral (NFCI). Based on the discretization of NFCIs, we computed the generalized Friis transmission Equation to obtain the power-receiving behaviors of practical helicoidal parabolic reflector antennas (HPRAs) with continuously deformed surfaces. A simplified Friis Equation is also used for computing the link budget and approximate Rayleigh length of discrete uniform circular arrays (UCAs) composed of $2\times 2$ dipole antennas. The transmission coefficients for the given OAM modes, represented by our Equations for the HPRA and UCA, agree very well with commercial numerical simulators. In addition, an $m$ th-order NFCI, which is an orthogonal convolution integral for the $m$ th OAM mode, is proposed to define a figure of merit for the OAM mode purity of transmitting and receiving antennas.
Jia Liu - One of the best experts on this subject based on the ideXlab platform.
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placement of multiple rfid reader antennas to alleviate the negative effect of tag orientation
International Conference on Parallel and Distributed Systems, 2012Co-Authors: Jia Liu, Lijun ChenAbstract:One primary issue which hinders large-scale Radio Frequency Identification (RFID) applications is the imperfect read rate. According to Friis Equation and experiments, we find that the dipole tag's orientation plays a significant role in read performance both in theory and practice. In this paper, we consider how to deploy multiple reader antennas to alleviate the negative effect caused by uncontrollable tag orientations in item-level applications. Different from previous work, we expand the candidate antenna positions from the portal to real three dimensional space and establish two estimation functions based on sphere coverage models under different polarized environment. Meanwhile, we provide an improved enumeration scheme with leaping and layering search strategies based on sphere quadtree (SQT) model to find optimized deployment.
