A periodic leaky-wave antenna (PLWA) can usually produce a narrow beam scanning in the backward and in the forward quadrants with frequency. However, a PLWA with a low permittivity may suffer from some stopbands (e.g....
A periodic leaky-wave antenna (PLWA) can usually produce a narrow beam scanning in the backward and in the forward quadrants with frequency. However, a PLWA with a low permittivity may suffer from some stopbands (e.g., open stopband and the next coming stopband) and unwanted grating lobe, as the main beam scans through broadside and in the forward quadrant. Besides, it may also suffer from an unwanted grating lobe, which limits its single-beam scanning range. This talk discusses recent advances in the research on the suppression of two stopbands (the open stopband and the next coming stopband) and unwanted grating lobe in PLWA.
A miniaturized dual-band dipole-based planar antenna for mobile satellite service (MSS) is presented. Four pairs of U-shaped arms are added at the end of the dipole, which can reduce the antenna area to 0.18 λ 0 ...
A miniaturized dual-band dipole-based planar antenna for mobile satellite service (MSS) is presented. Four pairs of U-shaped arms are added at the end of the dipole, which can reduce the antenna area to 0.18 λ 0 × 0.1 λ 0 . To improve impedance matching, a pair of trapezoidal structures are loaded at the feeding point. A prototype was designed, fabricated, and measured to verify the idea. Good agreement between the simulations and measurements is obtained. The measured 10-dB impedance bandwidths are 1.83% (1512-1540 MHz) and 1.69% (1647-1675 MHz), respectively, which can fully support the 7-MHz L-band MSS.
This work presents a decoupling method for aperture-coupled patch antenna arrays, especially for millimeter-wave applications since the method is simple in both principle and structure. There is no additional decoupli...
This work presents a decoupling method for aperture-coupled patch antenna arrays, especially for millimeter-wave applications since the method is simple in both principle and structure. There is no additional decoupling structure, and the decoupling is achieved by constructing a decoupling path between the feeding line of an element and the feeding aperture of the adjacent element to cancel the original mutual coupling. Although no decoupling operation is utilized between non-adjacent elements, the coupling between them is also reduced. Full-wave simulated results of an example working at 27.5 GHz are provided to verify the effectivity of the decoupling method, from impedance matching, coupling suppression, and radiation performance point of view.
In this paper, we explore the application of trellis-coded modulation (TCM) in long-haul optical fiber transmissions. We discuss the benefits of TCM in linear transmission as well as degradation in the nonlinear region.
In this paper, we explore the application of trellis-coded modulation (TCM) in long-haul optical fiber transmissions. We discuss the benefits of TCM in linear transmission as well as degradation in the nonlinear region.
The growth of Czochralski(CZ) monocrystalline silicon is a nonlinear dynamic time-varying system with complex physical changes and multi-field and multi-phase coupling. In order to meet the needs of information develo...
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A millimeter-wave dielectric cylindrical Luneburg Lens antenna is proposed, which is comprised of multiple concentric dielectric shells of the same thickness. The dielectric-constant distribution of the cylinder is co...
A millimeter-wave dielectric cylindrical Luneburg Lens antenna is proposed, which is comprised of multiple concentric dielectric shells of the same thickness. The dielectric-constant distribution of the cylinder is controlled by the volume fraction of air between dielectric shells. The measured gain of the proposed antenna varies from 9.86 to 11.80 dBi from 30 GHz to 40 GHz. A low side-lobe level of −18.35 dB is obtained from measured radiation patterns at 35 GHz.
Automatic parameter tuning methods for planning algorithms, which integrate pipeline approaches with learning-based techniques, are regarded as promising due to their stability and capability to handle highly constrai...
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This paper presents a novel microstrip magnetic dipole (MD) antenna with reconfigurable beamwidth. The proposed design is composed of a microstrip magnetic antenna and two metal planes. The angle of the metal planes i...
This paper presents a novel microstrip magnetic dipole (MD) antenna with reconfigurable beamwidth. The proposed design is composed of a microstrip magnetic antenna and two metal planes. The angle of the metal planes is adjustable, and the metal planes are used as a reconfigurable corner reflector. As the angle varies, the reflection coefficients in the operating band (5.67-5.91GHz) are retained below −10dB, and the E-plane half-power beamwidth (HPBW) varies from 37° to 142°. The maximum gain of 12.1 dBi is obtained when the beamwidth is 37°, and the minimum gain of 8.9 dBi is obtained when the beamwidth is 142°. The proposed design is a good candidate for base station applications to enhance traffic capacity.
The nonlinear distortion resulted from the Kerr effect in optical fibers limits the transmission capacity in long-haul optical fiber communications. In wavelength-division multiplexing (WDM) systems, the inter-channel...
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The contours of objects effectively represent essential 3D information such as shapes and boundaries. Existing contour detection methods mostly rely on thresholding or neural networks to classify points as edge or non...
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ISBN:
(数字)9798350349184
ISBN:
(纸本)9798350349191
The contours of objects effectively represent essential 3D information such as shapes and boundaries. Existing contour detection methods mostly rely on thresholding or neural networks to classify points as edge or non-edge points. However, these methods often lack generalization ability on datasets with different shapes, leading to issues such as missing contours and discontinuous distribution. To address this, we propose a 3D point cloud contour generation method based on the denoising diffusion probabilistic model (DDPM). Our method treats the complete point cloud as an explicit condition to guide the generation of contour from noise. Specifically, our method trains the DDPM to be a conditional generative network customized for contour generation tasks. In the network, we design the Conditional Feature Extraction (CFE) module that obtains multi-scale feature information, and the Conditional Feature Fusion (CFF) module embeds this information in the generation process to guide contour generation. The experimental results demonstrate the effectiveness of our method. The source code of our method is available at: https://***/djzgroup/ContourGeneration.
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