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[IEEE 2018 48th European Microwave Conference (EuMC) - Madrid, Spain (2018.9.23-2018.9.27)] 2018 48th European Microwave Conference (EuMC) - Fast Method to Optimize RF Bumper Transparency for Wide-Band Automotive Radar
摘要： This article describes novel methods to enhance the RF integration of wideband automotive radars. The first part of the paper is introducing the context and the considered scenario. Whereas the second part is focusing on two solutions to improve the radar integration in car chassis environment. The aim is to have good RF performances on wideband operation (76–81 GHz) and on a wide range of angle of incidence for the radar having wide field of view (e.g. Blind spot radar, Pedestrian detection,…).
关键词： transmission,metamaterial,reflection,radome,propagation,ACC radar
更新于2025-09-23 15:22:29
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Magnetoelectric uniaxial metamaterials as wide-angle polarization-insensitive matching layers
摘要： Antire?ection or impedance matching is a topic that has been extensively researched by the optical and microwave communities over the past century and until today. However, due to the diverging wave impedances of TE (s) and TM (p) polarizations with increasing incident angle, it is impossible to achieve perfect matching simultaneously for both polarizations at varying incidence angles with a single conventional isotropic matching layer. To achieve polarization-insensitive matching at an arbitrary incident angle, we propose a magnetoelectric uniaxial metamaterial layer (MEUML) that is inspired by the perfectly matched layer (PML) concept in computational electromagnetics. Similar to the PML, the MEUML requires speci?c uniaxial permittivity and permeability tensors. However, to simultaneously control both the transversal and longitudinal material parameters is not an easy task. To date, a true PML has not been realized with metamaterials. In this paper, we employ a simple and yet special metamaterial unit cell to achieve such control and synthesize a physical MEUML. The unit cell comprises two parallel metallic rings separated by a holey substrate. The transversal electric and magnetic dipole moments, and the longitudinal capacitive and diamagnetic coupling between the rings are judiciously controlled to achieve the required permittivity and permeability tensors. To aid the MEUML synthesis, we also introduce a technique that can extract the material parameter tensors at any incident angle. We ?rst demonstrate this concept by achieving polarization-insensitive matching of a high-index substrate at 45? with a single subwavelength-thick MEUML. We further adapt the concept to the microwave regime by developing a MEUML-based radome. Exceptional matching performance was obtained both in the simulations and measurements. The re?ectance remains below 5% from normal incidence (0?) to near grazing angle (85?) for both polarizations and over a wide bandwidth. With this unprecedented control of the material parameter tensors, the MEUML concept not only can be applied to impedance matching, but also can be utilized in many exotic applications that require extreme control of the material properties.
关键词： wide-angle,impedance matching,polarization-insensitive,radome,magnetoelectric uniaxial metamaterials
更新于2025-09-23 15:21:21
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[IEEE 2018 Cross Strait Quad-Regional Radio Science and Wireless Technology Conference (CSQRWC) - Xuzhou (2018.7.21-2018.7.24)] 2018 Cross Strait Quad-Regional Radio Science and Wireless Technology Conference (CSQRWC) - Active Frequency Selective Surface Based L-band Noise Rejection Conformal Radome
摘要： Active frequency selective surfaces have long been employed in the field of mutual coupling suppression and are receiving increasingly more attention due to its remarkable performances and flexibility. However, the frequency tunable range of the resonators is usually not wide enough, especially for the band-stop ones. Meanwhile, a tunable frequency selective surface usually requires a bias network, which makes the design even more difficult and limits the use of active frequency selective surfaces in building radomes. In this work, we make use of a previously designed broadband active frequency selective surface to realize a conformal tunable radome, the measured resonant frequency of which is tuned from 935MHz up to 2.405 GHz, and the designed structure is capable of suppressing narrow band noise effectively through the whole L-band.
关键词： active frequency selective surface,tunable frequency selective surface,radome,metamaterial
更新于2025-09-10 09:29:36
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[IEEE 2018 Cross Strait Quad-Regional Radio Science and Wireless Technology Conference (CSQRWC) - Xuzhou (2018.7.21-2018.7.24)] 2018 Cross Strait Quad-Regional Radio Science and Wireless Technology Conference (CSQRWC) - Specific Excitation Conditions Achieved by Near Field Source in EM Analysis
摘要： A simple preprocessing of providing specific incident conditions for the structures that work with antenna array is proposed in this paper. In lots of electromagnetic (EM) systems, such as antenna-radome system, antenna array always works with other structures. To figure out the EM performance of these kinds of structures, specific excitation condition is needed. Based on Huygens-Fresnel and superposition principles, instead of real-world antenna array modeling, near field source is used as the excitation source. Using this method, prescribed incident conditions can be achieved easily. Numerical results show that the strategy of the proposed preprocessing has a capability of good feasibility and the EM analysis efficiency can be improved.
关键词： large-scale antenna array,near field source,specific excitation condition,radome
更新于2025-09-10 09:29:36
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[IEEE 2018 International Conference on Microwave and Millimeter Wave Technology (ICMMT) - Chengdu, China (2018.5.7-2018.5.11)] 2018 International Conference on Microwave and Millimeter Wave Technology (ICMMT) - Metamaterial-Based 3-D Frequency-Selective Rasorber
摘要： A novel metamaterial-based 3-D frequency-selective rasorber (FSR) with wide low-insertion-loss passband and two-sided absorption bands is proposed. Two types of symmetric lossy split-ring resonators are employed in the unit cell of the periodic structure to produce the lower and upper absorption bands, respectively. It is shown through simulation that a low-insertion-loss (|S21|≥-1dB) passband can be obtained from 5.7 to 8GHz with the minimal insertion loss of 0.6dB around 6.5GHz and the fractional bandwidth for at least 10dB reflection reduction within the lower and upper frequency bands is 110% under normal incidence. Furthermore, by properly covering a pure PEC-backed dipole antenna by the proposed 3-D FSR array, a low-RCS antenna system is constructed, which exhibits a remarkable out-of-band radar cross section reduction (RCSR) and the enhanced radiation characteristics. It is expected that the proposed 3-D FSR design may be favorable for stealthy radome technologies.
关键词： stealthy radome technologies,two-sided absorption bands,metamaterial,low-insertion-loss passband,3-D frequency-selective rasorber
更新于2025-09-04 15:30:14
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[Institution of Engineering and Technology 12th European Conference on Antennas and Propagation (EuCAP 2018) - London, UK (9-13 April 2018)] 12th European Conference on Antennas and Propagation (EuCAP 2018) - Automotive Radar and Radome Calibration to Improve the Direction of Arrival Detection Performance
摘要： An assessment of the improvement in the Direction of Arrival (DoA) measurements in automotive radar sensor by joint calibration of the radar sensor plus the radome is presented. Nowadays, radar sensors are calibrated before the radome-emblem assembly. This makes radar sensors more vulnerable to the errors induced by the radome-emblems. This new approach is based on the idea of calibrating the radar sensor with the radome to improve the determination of the Direction of Arrival (DoA) and consequently reduce the angle error.
关键词： Calibration,Radar Sensor,Angle Error,Radome,Direction of Arrival,DoA
更新于2025-09-04 15:30:14
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[IEEE 2018 International Conference on Microwave and Millimeter Wave Technology (ICMMT) - Chengdu, China (2018.5.7-2018.5.11)] 2018 International Conference on Microwave and Millimeter Wave Technology (ICMMT) - A 120 GHz LTCC Packaged Horn Antenna with a Radome and Soft Surface Structure
摘要： A 120 GHz step-profiled horn antenna integrated in low-temperature co-fired ceramic (LTCC) packages with a radome is presented in this paper. As an antenna-in-package (AiP) design, the proposed hollow horn structure is constructed by the cavities with several surrounding fences of vertical metallic vias in multilayer LTCC substrates. In consideration of the practical application, co-design with a thick cylindrical radome attached to the surface of the antenna is also studied. A planar soft surface structure in electromagnetics around the horn antenna is introduced so as to suppress the propagation of surface waves inside the radome and thus improve the gain performance. The simulated results indicate that more than 9 GHz bandwidth of -10 dB return loss and a gain of 12.56 dBi in the radiation direction at 0θ= ? are obtained.
关键词： horn antenna,soft surface,Antenna-in-package (AiP),low-temperature co-fired ceramic (LTCC),radome
更新于2025-09-04 15:30:14