- 标题
- 摘要
- 关键词
- 实验方案
- 产品
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Compact Beam Scanning Flat Array Based on Substrate Integrated Waveguide
摘要： A compact beam scanning flat antenna array with high gain based on the substrate integrated waveguide (SIW) is presented in this paper. The radiation elements are the continuous transverse stub (CTS) constructed by SIW, which are arrayed on the substrate. The SIW-CTS array has a 4 dB higher gain than the traditional CTS array with the metal parallel plate waveguide and is analyzed. A new compact the theoretical explanation corporate-feed network consisting of a SIW horn and a flat lens is also proposed. The flat lens could convert the cylindrical wave-front generated by the feed probe and the SIW-horn to a planar wave-front for feeding the CTS array. The Taylor distribution of the feed level made the array has a low sidelobe and high gain. The beam scanning of the array could be realized by simply moving the small SIW-horn along the line across the focal point. An 8-element array is designed, simulated and fabricated to verify the design. The measured results show that the scanning range is from -35° to 35° with the highest gain of being 20.6dBi and the side lobe level of -25.2dB at the broadside.
关键词： beam scanning,flat array,substrate integrated waveguide (SIW),Continuous transverse stub (CTS)
更新于2025-09-19 17:13:59
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Compact High Gain Leaky-Wave Antennas Based on Substrate Integrated Waveguide TE <sub/>220</sub> Mode
摘要： In this paper, novel compact high gain broadband leaky-wave antenna (LWA) using TE220 high-order mode is proposed. The high-order mode antenna not only possesses more compact structure with higher gain, but also simpli?es the feeding network of the antenna array and relaxes processing tolerance. The radiation element consists of an SIW cavity etched with 2 × 2 slot array on the top surface, which is excited by a microstrip-slot coupling structure. Microstrip spoof surface plasmon polariton (SPP) is worked as a slow-wave transmission line (TL) to increase the beam scanning range of a four elements periodic array antenna. The antenna was simulated, optimized and fabricated, which veri?ed theoretical analysis. Experimental results show that the linearly polarized (LP) beam scanning antenna has a bandwidth of 53.5% (from 12.6 GHz to 21.8 GHz) with beam scanning range from ?24? to +32? and gain in the range of 10.2 dBi to 12.4 dBi. Then a linear-to-circular polarization converter is loaded to implement a circular polarization (CP) beam scanning antenna. The proposed antenna has the features of compact size, low pro?le, high gain, large beam scanning range and ?exible polarization conversion.
关键词： high-order mode,high gain,spoof surface plasmon polariton,Beam scanning antenna
更新于2025-09-19 17:13:59
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[IEEE 2019 IEEE International Symposium on Antennas and Propagation and USNC-URSI Radio Science Meeting - Atlanta, GA, USA (2019.7.7-2019.7.12)] 2019 IEEE International Symposium on Antennas and Propagation and USNC-URSI Radio Science Meeting - 2D Physical Optics Analysis of the Focal Region of Parallel-Plate Waveguide Lenses
摘要： A physical optics (PO) method for computing the focal-region fields of a parallel-plate waveguide (PPW) lens is presented. A simplified delay line model is used to represent the delay section between inner and outer lens profile. The lens is analyzed by assuming a plane wave incident on the outer contour. For a given lens geometry, the resulting maximum field loci at different angles of incidence are reported. The close agreement with full-wave results by a commercial simulator validates the applicability of the underlying two-dimensional (2D) lens model. The developed tool is several orders of magnitude faster than the general purpose full-wave simulation and therefore presents an efficient auxiliary tool for the design of lens feed networks.
关键词： parallel-plate waveguide lens,quasi-optical antennas,physical optics,beam-scanning,focal-region fields
更新于2025-09-16 10:30:52
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[IEEE 2019 IEEE Photonics Conference (IPC) - San Antonio, TX, USA (2019.9.29-2019.10.3)] 2019 IEEE Photonics Conference (IPC) - Dually-Modulated Photonic-Crystal Lasers for Beam Scanning
摘要： Mechanical-free, high-power, high-beam quality two-dimensional beam scanning is strongly required for LiDAR systems for autonomous driving. Here, we propose and demonstrate a new, dually-modulated photonic crystal laser, with which we successfully emit a high-quality laser beam with watt-class power in any desired direction.
关键词： PCSEL (Photonic-Crystal Surface-Emitting Laser),Photonic Crystal,2D Beam Scanning
更新于2025-09-11 14:15:04
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Measurement and Evaluation of Local Surface Temperature Induced by Irradiation of Nanoscaled or Microscaled Electron Beams
摘要： Electron beams (e-beams) have been applied as detecting probes and clean energy sources in many applications. In this work, we investigated several approaches for measurement and estimation of the range and distribution of local temperatures on a subject surface under irradiation of nano-microscale e-beams. We showed that a high-intensity e-beam with current density of 105-6 A/cm2 could result in vaporization of solid Si and Au materials in seconds, with a local surface temperature higher than 3000 K. With a lower beam intensity to 103-4 A/cm2, e-beams could introduce local surface temperature in the range of 1000–2000 K shortly, causing local melting in metallic nanowires and Cr, Pt, and Pd thin films, and phase transition in metallic Mg-B films. We demonstrated that thin film thermocouples on a freestanding Si3N4 window were capable of detecting peaked local surface temperatures up to 2000 K and stable, and temperatures in a lower range with a high precision. We discussed the distribution of surface temperatures under e-beams, thermal dissipation of thick substrate, and a small converting ratio from the high kinetic energy of e-beam to the surface heat. The results may offer some clues for novel applications of e-beams.
关键词： Vaporization,Local temperature,Nanoscale thermometry,Transmission electron microscopy,Thin film thermocouple,Energy converting,Electron beam,Scanning electron microscopy,Melting point
更新于2025-09-11 14:15:04
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Eighth-mode SIW based compact high gain leaky-wave antenna
摘要： In this article, a novel electrically small eighth-mode substrate integrated waveguide (EMSIW) based leaky-wave antenna (LWA) in planar environment is presented. The proposed antenna uses 1/8th mode SIW resonator which helps to improve compactness of the design while maintaining high gain and increased scanning angle. The proposed SIW cavity is excited by a 50 Ω microstrip line feeding to resonate at dominant TE110 mode in X-band. The dimensions of the resonators are adjusted to keep resonant mode at same frequency. The fabricated prototype is approximately 5λ0 long. Measured results show that the proposed leaky-wave antenna is able to operate within frequency range of 8-10 GHz with beam scanning range of 51° and maximum gain of 13.31 dBi.
关键词： frequency beam scanning,eighth-mode substrate integrated waveguide,leaky-wave antenna
更新于2025-09-10 09:29:36
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Independent control of harmonic amplitudes and phases via a time-domain digital coding metasurface
摘要： Harmonic manipulations are important for applications such as wireless communications, radar detection and biological monitoring. A general approach to tailor the harmonics involves the use of additional amplifiers and phase shifters for the precise control of harmonic amplitudes and phases after the mixing process; however, this approach leads to issues of high cost and system integration. Metasurfaces composed of a periodic array of subwavelength resonators provide additional degrees of freedom to realize customized responses to incident light and highlight the possibility for nonlinear control by taking advantage of time-domain properties. Here, we designed and experimentally characterized a reflective time-domain digital coding metasurface, with independent control of the harmonic amplitude and phase. As the reflection coefficient is dynamically modulated in a predefined way, a large conversion rate is observed from the carrier signal to the harmonic components, with magnitudes and phases that can be accurately and separately engineered. In addition, by encoding the reflection phases of the meta-atoms, beam scanning for multiple harmonics can be implemented via different digital coding sequences, thus removing the need for intricate phase-shift networks. This work paves the way for efficient harmonic control for applications in communications, radar, and related areas.
关键词： time-domain digital coding metasurface,metasurfaces,radar detection,nonlinear control,harmonic manipulations,wireless communications,beam scanning,biological monitoring
更新于2025-09-10 09:29:36
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Integrated Beam Scanning Silicon Lens Antenna at Submillimeter Wavelengths
摘要： This paper presents a lens antenna that scans the beam using an integrated piezo-motor at submillimeter wave frequencies. The lens antenna is based on the concept presented in [1], a leaky wave waveguide feed in order to achieve wide angle scanning and seamless integration with the receiver. The lens is translated from the origin of the waveguide producing the scanning of the beam over a 50 deg Field of View (FoV) (or about 6.25 beamwidths) with a maximum scanning loss of 1 dB. The lens movement is achieved with a piezoelectric motor that is integrated within the antenna and receiver block. A prototype was built and measured at 550 GHz achieving scanning beam angles close to 20 degrees with only 0.6 dB of loss. The scanning of the 50 deg FoV, which corresponds to a lens displacement of approximately 2 mm, takes about 0.9 s achieving a scanning rate of 0.75 Hz of the FoV. The accuracy in continuous mode of the piezo actuator has been measured to be less than 28μm in the worse of cases for displacements of 2 mm, which corresponds to a beam steering of 0.76 deg, much smaller than the antenna half power beamdwith of 8 deg.
关键词： leaky-wave waveguide feed,piezo-motor,Beam-scanning,submillimeter-wave,silicon lens
更新于2025-09-09 09:28:46
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Wide-Angle Beam Scanning Leaky-Wave Antenna Using Spoof Surface Plasmon Polaritons Structure
摘要： This paper proposes a wide-angle beam scanning leaky-wave antenna (LWA) fed by a novel spoof surface plasmon polaritons (SSPP) transmission line (TL). In the proposed LWA, circular metallic patches are periodically loaded on both sides of the SSPP TL alternately, and convert guided waves into radiating waves. The transmission characteristics of the proposed SSPP TL are analyzed, and the transmission characteristics and radiation patterns of the proposed LWA are simulated and measured. The simulated and measured results show that the proposed LWA provides approximately 12.5 dBi of radiation gain within a frequency range of 8–24 GHz, and a beam scanning range of 90? from forward to backward continuously by increasing the feeding frequency. The proposed LWA, based on a novel SSPP TL, has advantages of single-layer conductor, continuous wide-angle beam scanning, and high gain especially at the broadside direction, which are dif?cult realize using conventional LWAs.
关键词： beam scanning,spoof surface plasmon polaritons (SSPP),wide-angle,leaky-wave antenna (LWA)
更新于2025-09-09 09:28:46
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[IEEE 2018 IEEE International Conference on Computer and Communication Engineering Technology (CCET) - Beijing, China (2018.8.18-2018.8.20)] 2018 IEEE International Conference on Computer and Communication Engineering Technology (CCET) - A Wideband U-Slot Microstrip Patch Antenna for Large-Angle Mmw Beam Scanning
摘要： A simple U-slot microstrip patch antenna for wide band mmW beam scanning is designed and presented. The patch antenna is very simple and simulated result shows that the antenna has a wide relative bandwidth of 21.92% in the mmWave frequency band from 23.15GHz to 28.85GHz. Moreover, the patch’s radiation pattern possesses a 100 (cid:101)(cid:101) beam width at 28GHz, providing the capability of large-angle beam scanning.
关键词： U-slot,wide band,large-angle beam scanning
更新于2025-09-04 15:30:14