David Werbunat;Lukas Paulus;Julian Aguilar;Vinzenz Janoudi;Julian Kanz;Max Basler;Martin Vossiek;Christian Waldschmidt
{"title":"Coherent Radar Networks: Terminology, Synchronization, and Applications","authors":"David Werbunat;Lukas Paulus;Julian Aguilar;Vinzenz Janoudi;Julian Kanz;Max Basler;Martin Vossiek;Christian Waldschmidt","doi":"10.1109/JMW.2026.3689403","DOIUrl":"https://doi.org/10.1109/JMW.2026.3689403","url":null,"abstract":"In coherent radar networks, multiple radar sensors not only operate cooperatively but also facilitate coherent evaluation of signals from other spacially distant radar units. This overcomes the limitations of single radars, enabling extended apertures and new multistatic sensing geometries. Applications are manifold, ranging from network-based direction of arrival (DoA) estimation to bi-/multistatic synthetic aperture radar (SAR) and joint communication and sensing (JCAS). In recent years, this has led to significant research interest and the design of a wide range of radar networks and synchronization concepts. This paper introduces a unified terminology and a general signal model applicable to radar networks and bistatic radars. Building on this model, this work provides a detailed review of the main sources of synchronization errors and their impact on radar signal processing. The paper further surveys and categorizes synchronization strategies proposed in the literature to address these errors. It thereby enables both a structured comparison of current radar networks and the design of novel network and synchronization concepts for emerging applications. To illustrate the potential of these approaches, three applications are presented in detail: a novel DoA estimation strategy for distributed radar networks, UAV-borne bistatic SAR, and JCAS.","PeriodicalId":93296,"journal":{"name":"IEEE journal of microwaves","volume":"6 4","pages":"852-873"},"PeriodicalIF":4.5,"publicationDate":"2026-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11536065","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148452035","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"IEEE Journal of Microwaves Information for Authors","authors":"","doi":"10.1109/JMW.2026.3707669","DOIUrl":"https://doi.org/10.1109/JMW.2026.3707669","url":null,"abstract":"","PeriodicalId":93296,"journal":{"name":"IEEE journal of microwaves","volume":"6 4","pages":"C3-C3"},"PeriodicalIF":4.5,"publicationDate":"2026-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11611664","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148451999","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Adaptive Recursive Discretization AI-SI Algorithm for Electrical Performance Analysis of Radomes With Insulation Layers","authors":"Yongchao Wang;Ning Liu;Xianjun Shen;Ye Zhang","doi":"10.1109/JMW.2026.3698417","DOIUrl":"https://doi.org/10.1109/JMW.2026.3698417","url":null,"abstract":"This paper proposes an adaptive recursive discretization aperture-integration surface-integration (ARD AI-SI) method for the rapid analysis of the electrical performance of antenna-insulation-radome systems (AIRS). According to the equivalence principle, the antenna aperture and the insulation layer are treated as secondary radiation sources, effectively overcoming the analytical challenges posed by complex radome systems containing insulation layers. Furthermore, an adaptive recursive discretization strategy is employed to dynamically adjust the discretization granularity of the antenna aperture and equivalent sources based on far-field approximation conditions. This ensures strict adherence to computational accuracy while minimizing the computational load. Numerical results demonstrate that the proposed method achieves an optimal balance between accuracy and efficiency. Compared with the conventional AI-SI method, the proposed method drastically reduces the root mean square error (RMSE) of the boresight error (BSE) from 2.8723 mrad to 0.8500 mrad. In comparison with CST full-wave simulation results, the average relative error (ARE) of transmission efficiency is only 0.1110%, and the predicted variation trend of the boresight error exhibits high consistency with full-wave results. This method significantly enhances computational speed while providing high-precision analysis, making it highly suitable for the initial rapid design and optimization of radomes.","PeriodicalId":93296,"journal":{"name":"IEEE journal of microwaves","volume":"6 4","pages":"953-963"},"PeriodicalIF":4.5,"publicationDate":"2026-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11559265","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148451902","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Generalized Nonuniform Memory Polynomial Model for Digital Predistortion of RF Transmitters","authors":"Renlong Han;Falin Liu;Siping Gao","doi":"10.1109/JMW.2026.3705081","DOIUrl":"https://doi.org/10.1109/JMW.2026.3705081","url":null,"abstract":"A novel generalized nonuniform memory polynomial (GNMP) model is proposed for behavioral modeling and digital predistortion (DPD) of RF power amplifiers (PAs). The GNMP model uses a structure with simultaneous fading of memory depth and relative memory width. This paper proposes the concepts of “memory width” and “relative memory width” based on the close relationship between cross-terms and memory effect in Volterra basis functions. The memory width compensates for the shortcoming of using only the memory depth to describe the memory effect while avoiding the performance bottleneck caused by the fixed cross-term form. The even-order basis function is also introduced to improve the performance of the behavioral model with a further simplified form. The structural features of the GNMP model allow for more freedom in static nonlinearity and dynamic memory effect, making it superior in modeling and linearizing PAs with complex characteristics. Experimental tests on two different PAs show that the proposed GNMP model can achieve almost the same or better performance than the traditional model for the same complexity. More importantly, at an acceptable complexity, the GNMP model can further break the performance bottleneck of the traditional model by a few dB of typical metrics.","PeriodicalId":93296,"journal":{"name":"IEEE journal of microwaves","volume":"6 4","pages":"1087-1101"},"PeriodicalIF":4.5,"publicationDate":"2026-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11594848","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148451922","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"A W-Band 6-Bit 9 mW Active Phase Shifter With Phase Curve Reshaping Technique Based on High Performance PIVGA","authors":"Qijun Lu;Tao Rong;Dawei Han;Tao Zhang;Xiangkun Yin;Bei Liu;Zhangming Zhu","doi":"10.1109/JMW.2026.3690896","DOIUrl":"https://doi.org/10.1109/JMW.2026.3690896","url":null,"abstract":"This paper presents a W-band 6-bit active phase shifter based on power-domain vector summing technique and novel high-performance phase-inverting variable gain amplifiers (PIVGAs). It is composed of a power divider, two PIVGAs, and a quadrature hybrid coupler. The quadrature hybrid coupler is employed to accomplish power-domain vector summing, and the loading effects caused by the PIVGAs are effectively suppressed due to its high input port isolation. The gain and phase errors induced by the mismatches between the real and imaginary parts of the output impedance of PIVGAs are around 1% and 50% of that of the conventional current-combining structures. The proposed novel PIVGA incorporates a phase compensation capacitor to reshape its additional phase shift curve, and thus enhances the phase shift accuracy while simplifying the phase control process via half-quadrant control. Meanwhile, it exhibits minimized variations in its input and output impedances, reducing the mismatches in vector summing process. The proposed phase shifter is fabricated in 0.13 μm SiGe BiCMOS process with a core area of 585 × 400 μm<sup>2</sup>. The measurement results show that the proposed phase shifter consumes a DC power of 9 mW and achieves a peak average gain of 1.66 dB at 92 GHz, RMS gain error of 0.44∼0.78 dB, and RMS phase error of 1.06°∼2.5° within the operating band of 87.4∼101.2 GHz. In addition, the input 1-dB compression point is −4 dBm at 94 GHz.","PeriodicalId":93296,"journal":{"name":"IEEE journal of microwaves","volume":"6 4","pages":"1040-1054"},"PeriodicalIF":4.5,"publicationDate":"2026-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11535521","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148452151","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Advances in Large-Array Front-Ends for Millimeter-Wave and Terahertz Communication and Sensing Systems","authors":"Yasser Bigdeli;Pascal Burasa;Ke Wu","doi":"10.1109/JMW.2026.3703177","DOIUrl":"https://doi.org/10.1109/JMW.2026.3703177","url":null,"abstract":"Large-scale antenna arrays have become central to modern wireless communication and sensing systems, especially as technologies advance into the millimeter-wave (mmWave) and terahertz (THz) frequency regimes. Comprising hundreds or even thousands of radiating elements, these arrays enable high beamforming gain, spatial multiplexing, and improved signal-to-noise ratio—capabilities essential for emerging applications such as 5G/6G communications, automotive radar, satellite communications (SATCOM), and high-resolution imaging. Despite their immense potential, the realization of large arrays poses critical challenges in hardware design, including integration complexity, calibration precision, power efficiency, and system scalability. Addressing these challenges calls for innovations in RF front-end architectures, packaging and interconnect technologies, and intelligent control algorithms. This paper presents a comprehensive review of large-array hardware, organized around integration levels, RF front-end design approaches, and application domains. We examine state-of-the-art architectures with a focus on RF efficiency, beamforming accuracy, and calibration techniques. Key enabling technologies—such as antenna-in-package (AiP) solutions, photonic integration, and metasurface-based implementations—are discussed in depth. In addition, we highlight software-driven aspects, including adaptive beamforming and resource management strategies. The paper also surveys recent demonstrators and practical systems from both academia and industry. Finally, we identify open challenges and outline promising research directions toward the realization of cognitive integrated sensing and communication (ISAC) hardware platforms.","PeriodicalId":93296,"journal":{"name":"IEEE journal of microwaves","volume":"6 4","pages":"803-829"},"PeriodicalIF":4.5,"publicationDate":"2026-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11593935","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148454011","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"IEEE Microwave Theory and Technology Society Publication Information","authors":"","doi":"10.1109/JMW.2026.3685029","DOIUrl":"https://doi.org/10.1109/JMW.2026.3685029","url":null,"abstract":"","PeriodicalId":93296,"journal":{"name":"IEEE journal of microwaves","volume":"6 3","pages":"C2-C2"},"PeriodicalIF":4.9,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11513291","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147828855","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Dual-Mode Equilateral Triangular Resonator With Slit for Material Sensing","authors":"Hamidreza Laribi;Ali-Reza Moznebi;Kambiz Moez;Rashid Mirzavand","doi":"10.1109/JMW.2026.3679637","DOIUrl":"https://doi.org/10.1109/JMW.2026.3679637","url":null,"abstract":"This paper presents a dual-mode equilateral triangular resonator (DETR) sensor with a slit, which is theoretically analyzed and experimentally validated. In line with the theoretical analysis, the dual modes are the result of the rotation and superposition of the fundamental mode. A circuit model was developed tovalidate the theoretical analysis and good agreement was observed through a comprehensive comparison of results from full-wave simulations, theoretical calculations, and circuit model predictions. The proposed DETR operates in the industrial, scientific, and medical (ISM) band (902-928 MHz) and offers a unique communication link (or calibration) capability, making it a promising candidate for various applications. As a proof-of-concept, a prototype was designed, fabricated, and experimentally measured that confirmed the reliability of the sensor for material characterization. The results show that the higher frequency remains unaffected by distance changes between the sensor and receiver, whereas the lower frequency exhibits robust responses to various materials.","PeriodicalId":93296,"journal":{"name":"IEEE journal of microwaves","volume":"6 3","pages":"664-674"},"PeriodicalIF":4.9,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11483093","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147828956","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"IEEE Journal of Microwaves Information for Authors","authors":"","doi":"10.1109/JMW.2026.3685033","DOIUrl":"https://doi.org/10.1109/JMW.2026.3685033","url":null,"abstract":"","PeriodicalId":93296,"journal":{"name":"IEEE journal of microwaves","volume":"6 3","pages":"C3-C3"},"PeriodicalIF":4.9,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11513025","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147829010","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Shriniwas Kolpuke;Feras Abushakra;S. Prasad Gogineni;Mishal Thapa;Drew Taylor
{"title":"Airborne Dual-Polarized Ku-Band FMCW Synthetic Aperture Radar for Snow Measurements","authors":"Shriniwas Kolpuke;Feras Abushakra;S. Prasad Gogineni;Mishal Thapa;Drew Taylor","doi":"10.1109/JMW.2026.3651391","DOIUrl":"https://doi.org/10.1109/JMW.2026.3651391","url":null,"abstract":"We developed an ultra-wideband (UWB) dual-polarized Ku-band frequency-modulated continuous-wave (FMCW) airborne radar operating over the 13–18 GHz frequency range for measurements over snow and other targets. The radar uses a dual-polarized, shared-aperture Vivaldi antenna array and transmits 10 mW over a 180 μs sweep duration at a pulse repetition frequency of 5 kHz. In February 2023, we installed the system on a Twin Otter aircraft and performed measurements over snow in Grand Mesa, Colorado, USA. We collected data in nadir mode over a small transect to evaluate and optimize radar performance. Our results showed that the low-power airborne radar mapped snow-air and snow-land interfaces of 1.2–2.5 m thick snow.","PeriodicalId":93296,"journal":{"name":"IEEE journal of microwaves","volume":"6 2","pages":"350-359"},"PeriodicalIF":4.5,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11364520","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148509094","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}