Iet Microwaves Antennas & Propagation最新文献

{"title":"Design and Optimisation of Integrated Receiving Module for Segmented Guide Rail Dynamic Wireless Power Supply System","authors":"Jie Liu,&nbsp;Yanchang Zhang,&nbsp;Yunting Zhao,&nbsp;Tianwei Dang","doi":"10.1049/mia2.70113","DOIUrl":"https://doi.org/10.1049/mia2.70113","url":null,"abstract":"<p>Dynamic wireless power transfer technology has significant advantages in the power supply of mobile loads, achieving electrical isolation between the load and the charging line, and meeting the continuous work demand of the mobile load. The segmented guide dynamic wireless power transfer is the most widely used at present, but the uneven distribution of the magnetic field at the transmitting end of the system leads to power fluctuation during the whole operation cycle, which limits the further development of this technology. Based on this, the distribution characteristics of the dynamic coupling magnetic field of the segmented guide rail are analysed, and an integrated receiving module with a compensation structure is proposed. By compensating the transverse magnetic field component coupled by the receiving coil, the lack of coupling performance of the planar receiving coil in the transition state is made up, and the problem of low receiving power in the transition state is solved. Finally, the experimental platform of the segmented guide rail dynamic wireless power supply system is set up, and the effectiveness of the proposed scheme is verified by comparing the total power received by only planar receiving coil and adding compensation receiving coil.</p>","PeriodicalId":13374,"journal":{"name":"Iet Microwaves Antennas & Propagation","volume":"20 1","pages":""},"PeriodicalIF":1.3,"publicationDate":"2026-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/mia2.70113","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148282138","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Scattering of EM Waves From a Moving Sphere Under Uniform Acceleration: A Lorentz-Based Analytical and Numerical Investigation","authors":"Anis Darbandi,&nbsp;Ali Pourziad,&nbsp;Saeid Nikmehr","doi":"10.1049/mia2.70085","DOIUrl":"https://doi.org/10.1049/mia2.70085","url":null,"abstract":"<p>The scattering of electromagnetic waves from moving objects with intrinsic material losses is a critical phenomenon in high-frequency satellite and radar communications. This study presents a comprehensive analysis of wave scattering from a single lossy dielectric sphere subjected to an initial velocity and constant acceleration along the direction of the incident wave. The theoretical framework is formulated using Lorentz transformations, enabling accurate modelling of motion-induced effects. To incorporate acceleration, the time-dependent velocity parameter <span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 <mi>β</mi>\u0000 <mrow>\u0000 <mo>(</mo>\u0000 <mi>t</mi>\u0000 <mo>)</mo>\u0000 </mrow>\u0000 </mrow>\u0000 <annotation> $beta (t)$</annotation>\u0000 </semantics></math> is expanded via a Taylor-series approach, capturing the gradual evolution of relativistic corrections. Mie theory, combined with a complex refractive index, is employed to rigorously account for both scattering and absorption mechanisms. Numerical simulations implemented with coding in MATLAB provide time-resolved evaluations of the scattered field, including amplitude and phase distributions, transmission and attenuation coefficients, power density variations, and Radar Cross Section (RCS). The results demonstrate that acceleration significantly influences the temporal evolution of scattering signatures compared with the constant-velocity case, introducing frequency-dependent attenuation and phase modulation. These findings offer valuable physical insights into dynamic wave–object interactions and are directly applicable to the design of robust satellite communication links and advanced radar sensing systems operating in realistic time-varying propagation environments. This approach effectively bridges theoretical modelling with practical conditions, enhancing the accuracy of satellite link analysis under dynamic atmospheric scenarios.</p>","PeriodicalId":13374,"journal":{"name":"Iet Microwaves Antennas & Propagation","volume":"20 1","pages":""},"PeriodicalIF":1.2,"publicationDate":"2026-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/mia2.70085","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148173892","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A Frequency-Reconfigurable Dual-Band Nematic Liquid-Crystal Reflectarray Antenna With Angular Beam Separation for Satellite Communication","authors":"Hsi-Hsir Chou,&nbsp;Ping-Hsun Tsai,&nbsp;T. D. Wilkinson,&nbsp;Wing-Kit Choi","doi":"10.1049/mia2.70108","DOIUrl":"https://doi.org/10.1049/mia2.70108","url":null,"abstract":"<p>This paper presents a frequency-reconfigurable dual-band nematic liquid-crystal (LC) reflectarray antenna with angular beam separation for satellite communication. Dual-band operation at 12 and 28 GHz is achieved through voltage-controlled reconfiguration of the LC layer. In the proposed design, the reflectarray is illuminated by a feed antenna along boresight, and the reflected main beams are steered to 45° at 12 GHz and 30° at 28 GHz. This angular beam separation helps mitigate the inter-band interference issue commonly encountered in conventional dual-band reflectarray antennas. Simulated results demonstrate gains of 22.5 and 29.8 dBi at 12 and 28 GHz, respectively, with projected-aperture efficiencies of 43.3% and 35.2%. The corresponding sidelobe levels are 15 and 17 dB. To validate the design, a prototype was fabricated and experimentally characterised. The measured gains are 22.1 dBi at 12 GHz and 28.98 dBi at 28 GHz, corresponding to projected aperture efficiencies of 39.4% and 28.8%, respectively. The gain deviations from simulation are only 0.4 and 0.82 dB, mainly attributable to fabrication tolerances. The good agreement between simulation and measurement validates the proposed design and confirms its potential for dual-band satellite communication applications.</p>","PeriodicalId":13374,"journal":{"name":"Iet Microwaves Antennas & Propagation","volume":"20 1","pages":""},"PeriodicalIF":1.2,"publicationDate":"2026-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/mia2.70108","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148174709","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Dual-Band Circularly Polarised Filtering Antenna Based on the Characteristic Mode Analysis","authors":"Chenguang Guo,&nbsp;Zhan Zhang,&nbsp;Xiaona Fu,&nbsp;Junhong Wang","doi":"10.1049/mia2.70107","DOIUrl":"https://doi.org/10.1049/mia2.70107","url":null,"abstract":"<p>This paper presents a novel dual-band circularly polarised (CP) filtering antenna designed using electromagnetic coupling theory. First, characteristic mode analysis (CMA) is employed to verify that introducing different types of coupling between two adjacent patches significantly modifies the resonant frequencies of the inherent modes. Consequently, by applying specific coupling configurations between the patches, a desired modal distribution is achieved, enabling dual-band CP filtering performance across the two operational frequency bands. Subsequently, the analysis of the magnetic field distributions of the characteristic modes leads to the selection of slot-coupled feeding as the optimal excitation method to effectively activate the desired modes and achieve the intended functionality. Finally, to further enhance the filtering response without degrading the CP performance within the passbands, slots and open-circuit stubs are integrated into the feedline. This modification offers additional control over out-of-band suppression and improves selectivity. Following fabrication and measurement, the proposed antenna exhibits dual-band impedance bandwidths of 3.3–3.67 GHz (10.6%) and 4.74–5.28 GHz (10.7%). The corresponding axial ratio (AR) bandwidths are 1.4% (3.47–3.52 GHz) and 1.2% (4.86–4.92 GHz), respectively. These results validate the effectiveness of the synergistic integration between the guided patch coupling mechanism and the parasitic feedline elements. The proposed design approach enables the realisation of the multifunctional antenna structure, achieving dual-band operation, CP and intrinsic filtering characteristics within a single structure.</p>","PeriodicalId":13374,"journal":{"name":"Iet Microwaves Antennas & Propagation","volume":"20 1","pages":""},"PeriodicalIF":1.2,"publicationDate":"2026-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/mia2.70107","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148088676","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"","authors":"","doi":"","DOIUrl":"","url":null,"abstract":"","PeriodicalId":13374,"journal":{"name":"Iet Microwaves Antennas & Propagation","volume":"20 1","pages":""},"PeriodicalIF":1.2,"publicationDate":"2026-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148089175","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"","authors":"","doi":"","DOIUrl":"","url":null,"abstract":"","PeriodicalId":13374,"journal":{"name":"Iet Microwaves Antennas & Propagation","volume":"20 1","pages":""},"PeriodicalIF":1.2,"publicationDate":"2026-05-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148084495","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A Cylindrical Conformal Miniaturised Element Frequency Selective Surface With Unusual Resonance for Electromagnetic Shielding","authors":"Zhaoran Chen,&nbsp;Xiangyu Li,&nbsp;Junjie Hu,&nbsp;Xiayuan Yao","doi":"10.1049/mia2.70106","DOIUrl":"https://doi.org/10.1049/mia2.70106","url":null,"abstract":"<p>This paper introduces a Miniaturised Element Frequency Selective Surface (MEFSS) with unusual resonance characteristics that the longer loop determines the higher-frequency resonance, whereas the short loop supports the lower-frequency resonance, which provides electromagnetic shielding for the high-sensitivity Intermediate-Frequency (IF) receiver on the remote-sensing module of a radiometer and is transparent at the data-link frequency of 5.8 GHz. The MEFSS isolates the signals at 2.4 and 3.5 GHz, avoiding the crosstalk with IF signal. The longer metallic strip increases the equivalent inductance and improves resonance stability, as illustrated by an equivalent circuit model based on the field distribution. The planar and curved prototypes are fabricated and tested. The transmission coefficients of the planar Frequency Selective Surface (FSS) at different incident angles agree well with the simulation. In the test, MEFSS exceeds 17.3 dB in average shielding performance under normal incidence in two stopbands for both polarisations, with a maximum insertion loss of less than 1 dB over an incident angle range of 0°–70° in passband. The far-field patterns, gains, and insertion losses of conformal MEFSS are measured in Compact Antenna Test Range (CATR). The far-field patterns are consistent with the simulations. The measured insertion losses of conformal MEFSS in the passband are 0.60 and 0.47 dB under TE and TM polarisations.</p>","PeriodicalId":13374,"journal":{"name":"Iet Microwaves Antennas & Propagation","volume":"20 1","pages":""},"PeriodicalIF":1.2,"publicationDate":"2026-05-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/mia2.70106","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148083113","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Mask Based Array Pattern Synthesis via Subspace Relaxation and Levenberg–Marquardt Optimization","authors":"Kanglong Ye,&nbsp;Dike Ying,&nbsp;Yilun Chen,&nbsp;Zhiyu Wang,&nbsp;Jiarui Liu,&nbsp;Faxin Yu","doi":"10.1049/mia2.70104","DOIUrl":"https://doi.org/10.1049/mia2.70104","url":null,"abstract":"<p>Pattern synthesis based on complex masks remains challenging for optimization algorithms due to poor conditioning and slow convergence. To address this issue, this paper proposes SRLM, a novel pattern synthesis algorithm based on subspace relaxation and the Levenberg–Marquardt (LM) algorithm. The problem is formulated as a weighted nonlinear least-squares (LS) problem in the amplitude domain, where array excitations are represented in a reduced null space basis consistent with the mask. The resulting problem is solved using LM. A subspace relaxation mechanism progressively enlarges the solution space, enabling fast initial shaping and refined global optimization. Whitening is applied as a preconditioner to improve conditioning and computational efficiency during the LM iterations. Numerical experiments demonstrate that the proposed SRLM algorithm is competitive with representative state-of-the-art (SOTA) synthesis methods. In the low-dimensional case, it achieves comparable pattern control performance while maintaining efficient and stable convergence. For high-dimensional planar array synthesis, the algorithm exhibits robust performance across diverse scenarios, including stochastic constraints, irregular element layouts, and cases incorporating mutual coupling. Consequently, this study establishes a unified framework for high-fidelity radiation pattern synthesis.</p>","PeriodicalId":13374,"journal":{"name":"Iet Microwaves Antennas & Propagation","volume":"20 1","pages":""},"PeriodicalIF":1.2,"publicationDate":"2026-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/mia2.70104","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148068560","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"","authors":"","doi":"","DOIUrl":"","url":null,"abstract":"","PeriodicalId":13374,"journal":{"name":"Iet Microwaves Antennas & Propagation","volume":"20 1","pages":""},"PeriodicalIF":1.2,"publicationDate":"2026-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148067084","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A Phase-Only Hybrid Optimisation Method for Sparse Circularly Polarised Arrays","authors":"Yilun Chen,&nbsp;Fan Xiao,&nbsp;Dike Ying,&nbsp;Kanglong Ye,&nbsp;Yong Ni,&nbsp;Zhiyu Wang","doi":"10.1049/mia2.70103","DOIUrl":"https://doi.org/10.1049/mia2.70103","url":null,"abstract":"<p>A multiobjective phase-only design method, COMO-PHO (coevolutionary multiobjective with phase-only hybrid optimisation), is proposed for synthesising sparse circularly polarised phased arrays. The method introduces element rotation to improve circular polarisation and adopts a dual-population coevolutionary framework. This framework decomposes the high-dimensional optimisation—covering element selection, excitation phase and rotation angle—into coordinated placement and rotation optimisation, whilst jointly minimising sidelobe levels and axial ratio. A fast phase-only solver embedded in the evolutionary process quickly evaluates candidate layouts. Once the placement is fixed, a phase-only convex optimisation algorithm refines the phase distribution using the solver output as the initial solution, achieving precise beam steering and low sidelobes through controlled phase perturbation and linearised constraints. Simulations confirm that COMO-PHO balances multiple performance metrics for wide-angle scanning, offering a cost-effective solution for sparse circularly polarised phased array design. Furthermore, its effectiveness has been validated using measurements from an circularly polarised phased-array prototype, demonstrating the method's practical feasibility under real hardware conditions.</p>","PeriodicalId":13374,"journal":{"name":"Iet Microwaves Antennas & Propagation","volume":"20 1","pages":""},"PeriodicalIF":1.2,"publicationDate":"2026-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/mia2.70103","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148086935","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}