{"title":"IEEE Transactions on Antennas and Propagation Information for Authors","authors":"","doi":"10.1109/TAP.2026.3737349","DOIUrl":"https://doi.org/10.1109/TAP.2026.3737349","url":null,"abstract":"","PeriodicalId":13102,"journal":{"name":"IEEE Transactions on Antennas and Propagation","volume":"74 10","pages":"C3-C3"},"PeriodicalIF":5.9,"publicationDate":"2026-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11732239","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149131704","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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":"On the Unification of Deterministic and Stochastic Electromagnetic Information Theory via Symplectic Geometry","authors":"Marco Donald Migliore","doi":"10.1109/TAP.2026.3716533","DOIUrl":"https://doi.org/10.1109/TAP.2026.3716533","url":null,"abstract":"This article unifies deterministic and stochastic electromagnetic information theory (EIT) through symplectic geometry. For spatially incoherent sources, both formulations yield identical eigenvalues and spatial number of degrees of freedom (NDF). In the asymptotic regime and absence of losses, this equivalence is shown to be a structural necessity: the radiometric étendue, the Hamiltonian phase-space volume, and the NDF are the same symplectic invariant of the source–observer configuration. Liouville’s theorem guarantees conservation of the NDF under lossless propagation; Gromov’s nonsqueezing theorem establishes a minimum phase-space cell, setting a fundamental geometric bound on resolving power. The physical manifestation of this symplectic structure is the formation of <italic>spatial information flows</i> (SIFs) defined operationally as the spatial loci along which the spatial coherence (equivalently, the mutual information) decays at the minimum possible rate. Spatial information in electromagnetic fields is therefore governed by the geometry of the source–observer configuration, providing the foundation for a geometric theory of electromagnetic information.","PeriodicalId":13102,"journal":{"name":"IEEE Transactions on Antennas and Propagation","volume":"74 10","pages":"9675-9689"},"PeriodicalIF":5.9,"publicationDate":"2026-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149131440","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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":"Capacity-Driven Design of MIMO Systems Through Surface Current Engineering","authors":"Jiarun Hu;Said Mikki","doi":"10.1109/TAP.2026.3713197","DOIUrl":"https://doi.org/10.1109/TAP.2026.3713197","url":null,"abstract":"We present a general framework, valid for all electromagnetic (EM) MIMO communication systems, that exploits continuous surface current engineering to control information capacity. As proof-of-concept, we demonstrate the framework on capacitively loaded patch arrays via EMs-aware global optimization. The framework integrates an electromagnetically consistent Line-of-Sight (LoS) channel model (AEPs, infinitesimal dipole model (IDM), dyadic Green’s functions) with hardware-aware optimization treating capacitive loads as design variables, enabling capacity-driven singular value control via surface current-to-channel linking. Two design strategies are investigated: scenario-specific (near-field (NF) high-signal-to-noise ratio (SNR) or far-field low-SNR) and joint SNR-distance for robust performance. Results on a reconfigurable planar patch array show that the optimized loading configurations adaptively regulate the mutual coupling of the array to match different propagation conditions: under NF high-SNR scenarios, they promote a more balanced singular-value distribution for enhanced spatial multiplexing, whereas under far-field low-SNR scenarios, they reinforce dominant singular modes to improve noise resilience. Hardware preconditioning and digital processing are complementary; sensitivity analysis confirms robust capacity against <inline-formula> <tex-math>$Q$ </tex-math></inline-formula>-factor variations induced by both resistance and capacitance tolerances, with the load capacitance identified as a more influential parameter than resistance in determining the optimized channel structure. The proposed framework jointly optimizes channel capacity and realized gain, where the realized-gain objective accounts for reflection coefficient, radiation efficiency, and directivity, offering a novel pathway to harness EM resources for next-generation wireless systems.","PeriodicalId":13102,"journal":{"name":"IEEE Transactions on Antennas and Propagation","volume":"74 10","pages":"9531-9546"},"PeriodicalIF":5.9,"publicationDate":"2026-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149131507","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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":"Impedance Network-Based Design of a Metasurface for Polarization-Controlled Reflection and Transmission","authors":"Seyed Ehsan Hosseininejad;Mohsen Khalily;Rahim Tafazolli","doi":"10.1109/TAP.2026.3665972","DOIUrl":"https://doi.org/10.1109/TAP.2026.3665972","url":null,"abstract":"Designing metasurfaces capable of controlling both reflection and transmission under dual-polarization states at the same frequency remains a major challenge, primarily due to the reliance on computationally intensive full-wave simulations. Furthermore, a comprehensive theoretical design framework for such metasurfaces is still lacking. This article presents an efficient design methodology for polarization-controlled metasurfaces that manipulate both transmitted and reflected waves. The approach begins by developing an impedance network model for the unit cell, enabling the accurate prediction of reflection and transmission responses under dual-polarization states. The model’s accuracy is validated through the analysis of a unit cell with various loading conditions, including p-i-n diodes, capacitors, short circuits, and open circuits, demonstrating close agreement with full-wave simulations. Using this model, a unit cell is designed to achieve 2-bit phase coding in reflection for one polarization and 1-bit phase coding in transmission for the orthogonal polarization, both at the same frequency. The generalized Snell’s law is then extended to determine the spatial arrangement of unit cells for a demonstration scenario, which achieves far-field beam steering in reflection and near-field focusing in transmission. Theoretical, numerical, and experimental results verify the effectiveness of the proposed design approach.","PeriodicalId":13102,"journal":{"name":"IEEE Transactions on Antennas and Propagation","volume":"74 10","pages":"9212-9221"},"PeriodicalIF":5.9,"publicationDate":"2026-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149131734","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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":"Ultralow-Profile and High-Aperture-Efficiency Transmitarray Antenna Based on Combinational Modulation of Surface and Space Waves","authors":"Gu-Ying Deng;Huafeng Su;Huiping Yang;Yue Li;Xiu Yin Zhang","doi":"10.1109/TAP.2026.3707208","DOIUrl":"https://doi.org/10.1109/TAP.2026.3707208","url":null,"abstract":"This article presents an ultralow-profile transmitarray antenna (TA) with high aperture efficiency based on the combinational modulation of surface and space waves. The proposed antenna consists of a tensor impedance surface and a transmitarray plate. Different from conventional TAs and folded TAs (FTAs), whose profiles are constrained by the required spatial propagation path of electromagnetic waves, the proposed antenna exploits surface-wave propagation and modulation to design the aperture field for high aperture efficiency within an ultralow-profile configuration. The tensor impedance surface is used to modulate the surface wave excited by the feed source and redistribute the converted radiation field over the transmitarray aperture, thereby improving the taper and spillover efficiencies. The transmitarray plate further modulates the aperture phase distribution to improve the phase efficiency, thereby finally realizing high aperture efficiency. In addition, a systematic aperture-field design method is developed to facilitate the overall design. Finally, a TA operating at 26 GHz is designed, fabricated, and measured. It realizes a peak realized gain of 27.85 dBi, corresponding to an aperture efficiency of 57.12%. Its height-to-diameter (H/D) is merely 0.1, featuring both ultralow-profile and high-aperture-efficiency characteristics. The proposed method provides a feasible guideline for compact high-gain antenna systems in volume-constrained applications.","PeriodicalId":13102,"journal":{"name":"IEEE Transactions on Antennas and Propagation","volume":"74 10","pages":"9428-9437"},"PeriodicalIF":5.9,"publicationDate":"2026-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149131738","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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":"Dual-Polarized Magnetic-Dipole Antenna Array With High Aperture Efficiency and Port Isolation","authors":"Kai-Cheng Wang;Hang Wong","doi":"10.1109/TAP.2026.3706959","DOIUrl":"https://doi.org/10.1109/TAP.2026.3706959","url":null,"abstract":"This article presents a novel dual-polarized (DP) antenna element constructed using a cross slot, a cross loop, and four parasitic shorting patches. The cross loop, functioning as a magnetic dipole, is driven by two pairs of differential exciting pins (DEPs) located on opposite sides of the cross slot. Furthermore, the magnetic dipole excites four parasitic patches through magnetic coupling. This mechanism enables a uniform E-field distribution, enhancing both aperture efficiency and impedance matching bandwidth. The symmetric structure and the DEP contribute to high port isolation and consistency of performance in both polarizations. Consequently, the proposed DP antenna element achieves several advantages, including a wide bandwidth of 40% and a low profile of <inline-formula> <tex-math>$0.14~lambda _{mathbf {0}}$ </tex-math></inline-formula>. Building on this element, a <inline-formula> <tex-math>$4times 4$ </tex-math></inline-formula> DP antenna array with separate feeding networks is developed and fabricated. Measurements demonstrate a wide bandwidth of 34% (S<inline-formula> <tex-math>${}_{mathbf {11}} le -10$ </tex-math></inline-formula> dB) from 25.7 to 36.3 GHz, with peak gains of 21 and 21.3 dBi for the two polarizations. The measured aperture efficiency is about 84% at 30 GHz, and the port isolation exceeds 25 dB. This new antenna element and its array find potential applications for expanding the channel capacity and communication quality in millimeter-wave applications.","PeriodicalId":13102,"journal":{"name":"IEEE Transactions on Antennas and Propagation","volume":"74 10","pages":"9397-9405"},"PeriodicalIF":5.9,"publicationDate":"2026-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149133743","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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":"The Bragg Frequency Converter: A Meeting Between Spatial and Temporal Periodicities for Selective Parametric Frequency Translation","authors":"Sajjad Taravati","doi":"10.1109/TAP.2026.3709584","DOIUrl":"https://doi.org/10.1109/TAP.2026.3709584","url":null,"abstract":"This study introduces the Bragg frequency converter, a spatiotemporal-periodic grating concept that extends conventional Bragg gratings into the dynamic domain for pure parametric frequency conversion. By selectively time-modulating either the high-index or low-index layers of a quarter-wave stack, the structure achieves directional frequency conversion: high-index modulation yields efficient down-conversion, while low-index modulation produces up-conversion. This layer selectivity stems from the asymmetric Bloch mode distribution and associated phase-matching conditions. One practical realization, based on a silicon rib waveguide with periodic sidewall corrugations and selective doping of the high-index segments, is presented and analyzed. A coupled-mode theory is developed to explain the mechanism and validated through full-wave simulations. An experimental setup using optical pumping is also proposed for practical implementation. The theoretical and numerical results establish temporal Bragg gratings as a versatile, reconfigurable platform for spurious-free frequency conversion with applications in optical signal processing and integrated photonics.","PeriodicalId":13102,"journal":{"name":"IEEE Transactions on Antennas and Propagation","volume":"74 10","pages":"9612-9619"},"PeriodicalIF":5.9,"publicationDate":"2026-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149131138","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Zheng Xu Li;Hui Ran Zeng;Tong He;Yi Long Liu;Nan Nan Sun;Kai Li
{"title":"Theoretical Investigation of a Quartering Circular Loop Antenna in Ionospheric Plasmas","authors":"Zheng Xu Li;Hui Ran Zeng;Tong He;Yi Long Liu;Nan Nan Sun;Kai Li","doi":"10.1109/TAP.2025.3643992","DOIUrl":"https://doi.org/10.1109/TAP.2025.3643992","url":null,"abstract":"This article theoretically investigates a quartering circular loop antenna composed of four identical arc elements with independent feed sources, operating in ionospheric plasmas at very low frequencies (VLFs: 3–30 kHz). Based on Maxwell’s equations and the constitutive relation of the ionospheric plasmas, the integral equations with kernel functions are derived for the antenna. A set of phase-sequence voltages and currents is introduced to decouple the simultaneous integral equations into independent ones. By employing a six-term trial function for current distribution and numerical methods, the arc currents and input impedance are determined through the solution of the system of integral equations. The results show that the current along the arc exhibits a marked concentration around the feed point in the smaller loop radius. The sensitivity of input impedance to multiple parameters, including operating frequency, loop radius, and some ionospheric parameters, is analyzed by evaluating the impedance characteristics as a function of these parameters. The results for mutual impedance indicate that the mutual coupling effect can be neglected under certain conditions. Additionally, the quartering loop is also compared to a conventional loop in the previous work.","PeriodicalId":13102,"journal":{"name":"IEEE Transactions on Antennas and Propagation","volume":"74 10","pages":"9268-9279"},"PeriodicalIF":5.9,"publicationDate":"2026-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149131308","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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":"Hybrid Data- and Physics-Informed Electromagnetic Inversion for Nonuniform Plasma Diagnostics Using Antenna Reflection Coefficients","authors":"Jin-Gang Liu;Xiao-Wei Huang;Xin-Qing Sheng","doi":"10.1109/TAP.2026.3686675","DOIUrl":"https://doi.org/10.1109/TAP.2026.3686675","url":null,"abstract":"This article presents a hybrid data- and physics-informed network (HDPNet) for the electromagnetic inversion of nonuniform plasma parameters using antenna reflection coefficients. The network integrates an antenna decoupling network (ADNet) to transform measured antenna reflection coefficients into equivalent plane-wave reflection coefficients, thereby mitigating the modeling challenges associated with complex antenna structures. Meanwhile, an initial estimation network (IENet), trained on the same antenna reflection coefficients inputs, provides preliminary estimates of plasma parameters. The outputs of ADNet and IENet, serving as physical constraints and initialization, are jointly incorporated into a data-enhanced physics-informed neural network (DE-PINN). To address the performance degradation of PINN in high-frequency regimes, a composite enhancement strategy—combining phase factor separation with multiscale coordinate mapping—is proposed to improve the convergence and accuracy. The framework is validated through both full-wave simulations and ground-based experiments under uniform and nonuniform plasma conditions. Results demonstrate that HDPNet enables accurate, robust, and physically consistent plasma diagnostics, offering the solution for electromagnetic sensing in complex scenarios such as hypersonic flight.","PeriodicalId":13102,"journal":{"name":"IEEE Transactions on Antennas and Propagation","volume":"74 10","pages":"9136-9145"},"PeriodicalIF":5.9,"publicationDate":"2026-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149131408","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Si-Yu Wu;Peng-Fei Gu;Yu Qiao;Qian-Lei Zhuang;Lu Guo;Ahmed A. Kishk;Da-Zhi Ding
{"title":"Design Optimization of Hemispherical Conformal Phased Array Based on Partitioning and Hybrid Grouping Strategies","authors":"Si-Yu Wu;Peng-Fei Gu;Yu Qiao;Qian-Lei Zhuang;Lu Guo;Ahmed A. Kishk;Da-Zhi Ding","doi":"10.1109/TAP.2026.3710629","DOIUrl":"https://doi.org/10.1109/TAP.2026.3710629","url":null,"abstract":"This study addresses the challenge of balancing high hardware cost and radiation performance in a hemispherical circularly polarized conformal phased array by proposing an innovative optimization design method based on zoning and hybrid grouping strategies. The design employs a ten-layer concentric ring topology with a radius of <inline-formula> <tex-math>$3.2lambda _{0}$ </tex-math></inline-formula>, comprising 272 elements. By introducing the maximum local scan angle <inline-formula> <tex-math>$alpha _{max}$ </tex-math></inline-formula> as a dynamic partitioning criterion, the array is divided into a main excitation region (MER) containing high-activation-frequency elements with independently configured (transmit/receive) T/R modules, and a sub-excitation region (SER) containing low-activation-frequency elements with shared T/R modules. For the SER, two novel grouping strategies are proposed: the same-layer different-sector grouping method (applicable for <inline-formula> <tex-math>$alpha _{max} le 50^{circ }$ </tex-math></inline-formula>) and the layer-sector hybrid grouping method (effective up to <inline-formula> <tex-math>$alpha _{max} = 70^{circ }$ </tex-math></inline-formula>), achieving optimized antenna T/R module matching. Results demonstrate a 33% reduction in T/R modules (from 272 to 180) while maintaining a −20 dB sidelobe level (SLL). The layer-sector hybrid scheme achieves optimal performance at <inline-formula> <tex-math>$alpha _{max} = 65^{circ }$ </tex-math></inline-formula>, improving gain by 1.35 dBi compared to a conventional 180-element array. Fault analysis validates the design’s robustness, confirming stable sidelobe suppression even with up to 20% T/R module failures. This work provides a cost-effective methodology for wide-angle scanning systems, highlighting its potential in satellite radar and airborne communications.","PeriodicalId":13102,"journal":{"name":"IEEE Transactions on Antennas and Propagation","volume":"74 10","pages":"10067-10072"},"PeriodicalIF":5.9,"publicationDate":"2026-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149131691","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}