arXiv subjects

Shiwen Yang

Publications and source records attributed to Shiwen Yang.

4 recordsLinked to original sources

arXiv2026

Edge Truncation Effect Suppression of Ultrawideband Phased Arrays for Radar Application

This letter presents a novel, effective method to suppress the edge truncation effect of ultrawideband tightly coupled dipole linear arrays. To restrain the edge truncation effect within an ultrawideband operating band, a new type of T-shaped metal strip with a resistor is further loaded on the array edges apart from extending the length of the overlapping patches. Besides, the excitation phase of the elements at the array edges is optimized. Full-wave simulation results show that the active standing wave standing ratio of the 2 x 16 tightly coupled dipole linear arrays using the proposed method is significantly optimized to less than 3.5 within a 5:1 [(1.2 to 6) GHz] bandwidth, while scanning up to +/-60{\deg} in the E-plane. The effectiveness of the proposed method is experimentally verified by a 2 x 16 linear array prototype.

physics.app-ph↗

arXiv2025

Wideband Low-Scattering Dual-Polarized Phased Array with Stepped Ground

This paper proposes a wideband dual-polarized phased array with ultra-wideband scattering cross section (SCS) reduction. The antenna elements are loaded on a bilateral stepped ground. This ground is carefully designed in terms of height difference, step number, and length to achieve phase cancellation near the normal direction. Wideband dipoles with vertical electric coupling are designed. The radiation frequency band covers the X-band (40%) under VSWR < 2.8. Array patterns are synthesized with the two subarrays, covering the scanning range from -45 to +45 degrees. The monostatic SCSs of the proposed 17 x 8 array prototype have been reduced within 3.6 - 30 GHz, with an averaged reduction of over 19.4/18.9 dB and an averaged in-band reduction of over 15.4/16.6 dB, under the normal x/y polarized incident waves respectively.

physics.optics↗

arXiv2025

Attractor-Based Coevolving Dot Product Random Graph Model

We introduce the attractor-based coevolving dot product random graph model (ABCDPRGM) to analyze time-series network data manifesting polarizing or flocking behavior. Graphs are generated based on latent positions under the random dot product graph regime. We assign group membership to each node. When evolving through time, the latent position of each node will change based on its current position and two attractors, which are defined to be the centers of the latent positions of all of its neighbors who share its group membership or who have different group membership than it. Parameters are assigned to the attractors to quantify the amount of influence that the attractors have on the trajectory of the latent position of each node. We developed estimators for the parameters, demonstrated their consistency, and established convergence rates under specific assumptions. Through the ABCDPRGM, we provided a novel framework for quantifying and understanding the underlying forces influencing the polarizing or flocking behaviors in dynamic network data.

stat.ME↗

arXiv2022

BlueTiSCH: A Multi-PHY Simulation of Low-Power 6TiSCH IoT Networks

Low-power wireless IoT networks have traditionally operated over a single physical layer (PHY) -- many based on the IEEE 802.15.4 standard. However, recent low-power wireless chipsets offer both the IEEE 802.15.4 and all four PHYs of the Bluetooth 5 (BT 5) standard. This introduces the intriguing possibility that IoT solutions might not necessarily be bound by the limits of a single PHY, and could actively or proactively adapt their PHY depending on RF or networking conditions (e.g., to offer a higher throughput or a longer radio range). Several recent studies have explored such use-cases. However, these studies lack comprehensive evaluation over various metrics (such as reliability, latency, and energy) with regards to scalability and the Radio Frequency (RF) environment. In this work we evaluate the performance of IEEE 802.15.4 and the four BT 5 2.4GHz PHY options for the recently completed IETF 6TiSCH low-power wireless standard. To the best of our knowledge, this is the first work to directly compare these PHYs in identical settings. Specifically, we use a recently released 6TiSCH simulator, TSCH-Sim, to compare these PHY options in networks of up to 250 nodes over different RF environments (home, industrial, and outdoor), and highlight from these results how different PHY options might be better suited to particular application use-cases.

cs.NI↗