arXiv subjects

Wenquan Che

Publications and source records attributed to Wenquan Che.

4 recordsLinked to original sources

arXiv2025

A Novel Class-F 2.45/5.8 GHz Dual-Band Rectifier for Wireless Power Transmission

This letter proposes a high-efficiency dual-band class-F rectifier for wireless power transmission (WPT). The rectifier comprises a dual-band harmonic termination network, a dual-band matching network, a single Schottky diode, and a dc pass filter. A theoretical analysis of the harmonic termination network is performed to improve the rectifying efficiency. The network exhibits good class-F operation by controlling the second and third harmonics in dual bands. A rectifier operating at 2.45 and 5.8 GHz was designed, fabricated, and measured for validation. The measurements show maximum RF-dc conversion efficiencies of 74.9% and 61.9% with 200 and 500{\Omega} loads at 2.45 and 5.8 GHz, respectively. The proposed rectifier achieves dual-band harmonic control with high efficiency.

physics.app-ph↗

arXiv2025

Tri-band Aperture-shared Antenna Array Using Scalable FSS-based Electromagnetic Transparent Structure

In a tri-band aperture-shared array (TBA), the low-band (LB) dipole often deteriorates the radiation patterns of the middle-band (MB) and high-band (HB) antennas due to shielding effects. To address this issue, a novel dual-band electromagnetic transparent structure (DBTS) is firstly proposed and used to realize a TBA. The DBTS achieves two tunable electromagnetic transparent frequency bands by periodically loading capacitive patches and meander lines to an inductive strip. Meanwhile, the DBTS features flexible frequency band scalability by loading additional serial L-C tanks. Then the DBTS is utilized to construct the LB dipole of a TBA, with its electromagnetic transparent bands allocated at MB and HB simultaneously. The proposed array realizes an aperture-shared operation within the frequency ranges covering 0.65-0.88 GHz (LB), 1.92-2.18 GHz (MB) and 3.3-3.8 GHz (HB). The LB dipole induces minimal shielding to the MB and HB antennas, resulting in their restored radiation performance with broadside gain deviation of less than 0.6 dB.

physics.app-ph↗

arXiv2025

Capacity Enhancement Analysis and Implementation of a 3D Array Based on Miniaturized Dipole Antennas

Theoretically, the three-dimensional (3D) array architecture provides a higher communication degree of freedom (DoF) compared to the planar arrays, allowing for greater capacity potential in multiple-input multiple-output (MIMO) systems. However, in practical implementations, the upper elements of 3D arrays significantly degrade the performance of the lower elements, leading to increased inter-element correlation and reduced array efficiency. As a result, the expected enhancement in MIMO performance is often suboptimal. To address this issue, this work employs a miniaturized antenna element to reduce the inter-element correlation and thus enhance the DoF of the 3D array. Moreover, to mitigate the efficiency degradation of the lower elements caused by the upper ones, the structures of lower elements are modified to achieve wideband impedance matching. The influence of upper element profile distribution on DoF and element efficiency is investigated, and the scalability of the proposed 3D array is theoretically analyzed. Finally, the MIMO performance of the proposed 3D array is evaluated under 3GPP scenarios, demonstrating a 16% higher capacity than conventional 2D arrays under the same SNR of 20 dB and a physical aperture area of 6.26 {\lambda}02. These results indicate that 3D arrays of appropriately arranged miniaturized elements offer a promising approach to enhancing MIMO system performance.

physics.app-ph↗

arXiv2025

Wide-angle Scanning Heterogeneous Element-Based Phased Array Using Novel Scanning Envelope Synthesis Method

Two novel methods, including the scanning envelope synthesis (SES) method and the active reflection self-cancellation (ARC) method, are proposed to design wide-angle scanning heterogeneous element phased arrays. Heterogeneous strategy is efficient to extend scanning range but quantitatively characterization of the effect is critically needed to guide design for achieving desired performance. The proposed SES method derives theoretically the relationship between scanning range and the 3dB-beamwidth of the pattern envelope of one phased array, which is linear superposition of active radiation pattern (AEP) magnitude of each element. Therefore, the contribution of each kind of heterogeneity can be quantitatively analyzed for further enhancing the scanning range. As we see, a high active reflection coefficient of the phased array can directly reduce the realized gain. In this way, one ARC method is proposed to reduce the active reflection coefficient by counteracting the reflection component of active reflection coefficient with its transmission component, thereby keeping the realized gain efficiently even when the array scans at large angels. For verification, one 24.5-29.5GHz 4x4 phased array scanning in E-plane is designed and fabricated. Benefiting from the proposed SES method, the scanning range of the prototype is extended up to $\pm74\deg$, around 10{\deg} improvement over one traditional heterogeneous array. Meanwhile, the active reflection coefficient is reduced from -4dB to lower than -7.5dB by applying the ARC method.

physics.app-ph↗