A pre-processing blind muhiuser detection algorithms based on the least squares constant modulus （P-LSCMA） using antenna array is proposed in this paper. It first uses the signals received from every antenna to corr...A pre-processing blind muhiuser detection algorithms based on the least squares constant modulus （P-LSCMA） using antenna array is proposed in this paper. It first uses the signals received from every antenna to correlate with the conjugation of the DoA vector of the expected user, and then applies the pre-processed signals to the LSCMA. We simulate and compare the proposed algorithm with the conventional LSCMA. Simulation results show that the proposed algorithm is superior to LSCMA.展开更多
多输入多输出(Multiple-Input Multiple-Output,MIMO)雷达在阵元故障时虚拟阵列输出数据矩阵会出现大量的整行数据丢失,由于阵列接收数据矩阵的不完整而导致对波达方向(Direction of Arrival,DOA)的估计性能恶化。大多数低秩矩阵填充算...多输入多输出(Multiple-Input Multiple-Output,MIMO)雷达在阵元故障时虚拟阵列输出数据矩阵会出现大量的整行数据丢失,由于阵列接收数据矩阵的不完整而导致对波达方向(Direction of Arrival,DOA)的估计性能恶化。大多数低秩矩阵填充算法要求缺失数据随机分布于不完整的矩阵中,无法适用于整行缺失数据的恢复问题。为此,提出了一种基于低秩块Hankel矩阵正则化的阵元故障MIMO雷达DOA估计方法。首先,通过奇异值分解(Singular Value Decomposition,SVD)降低虚拟阵列输出矩阵的维度,以减少计算复杂度。然后,对降维数据矩阵建立基于块Hankel矩阵正则化的低秩矩阵填充模型,在该模型中将MIMO雷达降维数据矩阵排列成块Hankel矩阵并施加Schatten-p范数作为正则项。最后,结合交替方向乘子法(Alternate Direction Multiplier Method,ADMM)求解该模型,获得完整的MIMO雷达降维数据矩阵。仿真结果表明,所提方法能够有效恢复降维数据矩阵中的整行数据缺失,具有较高的DOA估计精度和实时性,在阵元故障率低于50.0%时DOA估计精度优于现有方法。展开更多
设计了一种P波段的宽带端射天线。该天线以传统八木天线为基础,将振子尺寸缩小为原来的一半,并将振子放置在金属平板上,进而对天线的反射器和引向器进行改进,并通过对天线参数的仿真优化,最终将天线的带宽扩展到了38.4%,并保证了频带内...设计了一种P波段的宽带端射天线。该天线以传统八木天线为基础,将振子尺寸缩小为原来的一半,并将振子放置在金属平板上,进而对天线的反射器和引向器进行改进,并通过对天线参数的仿真优化,最终将天线的带宽扩展到了38.4%,并保证了频带内相对较高的增益。仿真结果表明,天线能够在0.5~0.8 GHz的频带之内实现良好端射,并保证带内回波损耗均在-10 d B以下,整个频段内天线的方向性系数均在8.6 d Bi以上。展开更多
随着5G时代的到来,各地5G基站的建设如火如荼,同时5G网络建设存在工程投资大、5G天线部署需要关注覆盖性能及部署周期等问题。文章针对在利旧基站建设过程中存在的天面空间受限、5G低挂高、铁塔风荷载受限等问题,对A+P(Combination of a...随着5G时代的到来,各地5G基站的建设如火如荼,同时5G网络建设存在工程投资大、5G天线部署需要关注覆盖性能及部署周期等问题。文章针对在利旧基站建设过程中存在的天面空间受限、5G低挂高、铁塔风荷载受限等问题,对A+P(Combination of active and passive antennas)一体化设备在中国电信和中国联通的5G基站建设中的使用方式提出一些建议,根据A+P设备在不同建设场景来进行工程建设、投资分析,说明A+P一体化设备的较高实用性。展开更多
提出了一种小型超宽带平面倒锥形单极子天线。采用微带线对倒锥形辐射贴片进行馈电，背面采用相似形缺陷地结构窗口。天线总体尺寸为25 mm ×23 mm ×1.6 mm，较之前同类天线尺寸缩小了约33%。采用仿真软件分析了该天线的阻抗...提出了一种小型超宽带平面倒锥形单极子天线。采用微带线对倒锥形辐射贴片进行馈电，背面采用相似形缺陷地结构窗口。天线总体尺寸为25 mm ×23 mm ×1.6 mm，较之前同类天线尺寸缩小了约33%。采用仿真软件分析了该天线的阻抗带宽、辐射方向图及增益特性。经优化后，该天线10 dB回波损耗带宽为3~11 GHz，阻抗带宽达到114%，覆盖了整个UWB频段。天线在整个频带内增益为3~4 dB。展开更多
We present an antenna-in-package system integrated with a meander line antenna based on low temperature co-fired ceramic(LTCC) technology. The proposed system employs a meander line patch antenna, a packaging layer, a...We present an antenna-in-package system integrated with a meander line antenna based on low temperature co-fired ceramic(LTCC) technology. The proposed system employs a meander line patch antenna, a packaging layer, and a laminated multi-chip module(MCM) for integration of integrated circuit(IC) bare chips.A microstrip feed line is used to reduce the interaction between patch and package. To decrease electromagnetic coupling, a via hole structure is designed and analyzed. The meander line antenna achieved a bandwidth of 220 MHz with the center frequency at 2.4 GHz, a maximum gain of 2.2 d B, and a radiation efficiency about 90% over its operational frequency. The whole system, with a small size of 20.2 mm×6.1 mm×2.6 mm, can be easily realized by a standard LTCC process. This antenna-in-package system integrated with a meander line antenna was fabricated and the experimental results agreed with simulations well.展开更多
We propose a miniaturized wideband metasurface antenna for 60-GHz antenna-in-package applications.With the glass integrated passive device manufacturing technology,we introduce a coplanar-waveguide-fed(CPW-fed)ring re...We propose a miniaturized wideband metasurface antenna for 60-GHz antenna-in-package applications.With the glass integrated passive device manufacturing technology,we introduce a coplanar-waveguide-fed(CPW-fed)ring resonator to characterize the material properties of the glass substrate.The proposed antenna is designed on a high dielectric constant glass substrate to achieve antenna miniaturization.Because of the existence of gaps between patch units compared with the conventional rectangular patch in the TM10 mode,the radiation aperture of this proposed antenna is reduced.Located right above the center feeding CPW-fed bow-tie slot,the metasurface patch is realized,supporting the TM10 mode and antiphase TM20 mode simultaneously to improve the bandwidth performance.Using a probe-based antenna measurement setup,the antenna prototype is measured,demonstrating a 10-dB impedance bandwidth from 53.3 to 67 GHz.At 60 GHz,the antenna gain measured is about 5 dBi in the boresight direction with a compact radiation aperture of 0.31λ0×0.31λ0 and a thickness of 0.06λ0.展开更多
Accurate simulations of ultra-wideband （UWB） electromagnetic radiation from an antenna were developed based on a time-domain finite element method （TDFEM） based on p-step Lagrange interpolation for the temporal ex...Accurate simulations of ultra-wideband （UWB） electromagnetic radiation from an antenna were developed based on a time-domain finite element method （TDFEM） based on p-step Lagrange interpolation for the temporal expansion. The motivation was to utilize the good interpolation features and straightforward computations for UWB antenna simulations. Numerical results were obtained from the cases of the cavity resonance problem, a bowtie and a Sierpinski bowtie antenna. Comparisons with an existing TDFEM approach employed linear temporal basis functions show good agreement to demonstrate the validity of the present schemes. The TDFEM with 2-step Lagrange interpolation as the temporal basis functions achieves better numerical results with only a small increase to run time and memory use in terms of the relative errors of the resonant frequency in the cavity for the transverse electric mode and the radiation patterns of the bowtie antenna.展开更多
基金This work was sponsored by the National Natural Science Foundation of China (60472104) and the Doctoral InnovativeFoundation of Jiangsu Province (xm04 -32) and the natural science researchitemof Jiangsu University (04KJB510094)
文摘A pre-processing blind muhiuser detection algorithms based on the least squares constant modulus （P-LSCMA） using antenna array is proposed in this paper. It first uses the signals received from every antenna to correlate with the conjugation of the DoA vector of the expected user, and then applies the pre-processed signals to the LSCMA. We simulate and compare the proposed algorithm with the conventional LSCMA. Simulation results show that the proposed algorithm is superior to LSCMA.
文摘多输入多输出(Multiple-Input Multiple-Output,MIMO)雷达在阵元故障时虚拟阵列输出数据矩阵会出现大量的整行数据丢失,由于阵列接收数据矩阵的不完整而导致对波达方向(Direction of Arrival,DOA)的估计性能恶化。大多数低秩矩阵填充算法要求缺失数据随机分布于不完整的矩阵中,无法适用于整行缺失数据的恢复问题。为此,提出了一种基于低秩块Hankel矩阵正则化的阵元故障MIMO雷达DOA估计方法。首先,通过奇异值分解(Singular Value Decomposition,SVD)降低虚拟阵列输出矩阵的维度,以减少计算复杂度。然后,对降维数据矩阵建立基于块Hankel矩阵正则化的低秩矩阵填充模型,在该模型中将MIMO雷达降维数据矩阵排列成块Hankel矩阵并施加Schatten-p范数作为正则项。最后,结合交替方向乘子法(Alternate Direction Multiplier Method,ADMM)求解该模型,获得完整的MIMO雷达降维数据矩阵。仿真结果表明,所提方法能够有效恢复降维数据矩阵中的整行数据缺失,具有较高的DOA估计精度和实时性,在阵元故障率低于50.0%时DOA估计精度优于现有方法。
文摘设计了一种P波段的宽带端射天线。该天线以传统八木天线为基础,将振子尺寸缩小为原来的一半,并将振子放置在金属平板上,进而对天线的反射器和引向器进行改进,并通过对天线参数的仿真优化,最终将天线的带宽扩展到了38.4%,并保证了频带内相对较高的增益。仿真结果表明,天线能够在0.5~0.8 GHz的频带之内实现良好端射,并保证带内回波损耗均在-10 d B以下,整个频段内天线的方向性系数均在8.6 d Bi以上。
文摘随着5G时代的到来,各地5G基站的建设如火如荼,同时5G网络建设存在工程投资大、5G天线部署需要关注覆盖性能及部署周期等问题。文章针对在利旧基站建设过程中存在的天面空间受限、5G低挂高、铁塔风荷载受限等问题,对A+P(Combination of active and passive antennas)一体化设备在中国电信和中国联通的5G基站建设中的使用方式提出一些建议,根据A+P设备在不同建设场景来进行工程建设、投资分析,说明A+P一体化设备的较高实用性。
文摘提出了一种小型超宽带平面倒锥形单极子天线。采用微带线对倒锥形辐射贴片进行馈电，背面采用相似形缺陷地结构窗口。天线总体尺寸为25 mm ×23 mm ×1.6 mm，较之前同类天线尺寸缩小了约33%。采用仿真软件分析了该天线的阻抗带宽、辐射方向图及增益特性。经优化后，该天线10 dB回波损耗带宽为3~11 GHz，阻抗带宽达到114%，覆盖了整个UWB频段。天线在整个频带内增益为3~4 dB。
基金supported by the National Natural Science Foundation of China(Nos.61574106 and 61334003)the National Defense Pre-research Foundation of China(No.9140A23060115DZ01062)the Key Science and Technology Special Pro ject of Shaanxi Province,China(No.2015KTCQ01-5)
文摘We present an antenna-in-package system integrated with a meander line antenna based on low temperature co-fired ceramic(LTCC) technology. The proposed system employs a meander line patch antenna, a packaging layer, and a laminated multi-chip module(MCM) for integration of integrated circuit(IC) bare chips.A microstrip feed line is used to reduce the interaction between patch and package. To decrease electromagnetic coupling, a via hole structure is designed and analyzed. The meander line antenna achieved a bandwidth of 220 MHz with the center frequency at 2.4 GHz, a maximum gain of 2.2 d B, and a radiation efficiency about 90% over its operational frequency. The whole system, with a small size of 20.2 mm×6.1 mm×2.6 mm, can be easily realized by a standard LTCC process. This antenna-in-package system integrated with a meander line antenna was fabricated and the experimental results agreed with simulations well.
基金supported by the National Key R&D Program of China(Nos.2018YFE0205900 and 2016YFC0800400)the National Science and Technology Major Project,China(No.2018ZX03001008)the National Natural Science Foundation of China(Nos.61306030 and 61674037)。
文摘We propose a miniaturized wideband metasurface antenna for 60-GHz antenna-in-package applications.With the glass integrated passive device manufacturing technology,we introduce a coplanar-waveguide-fed(CPW-fed)ring resonator to characterize the material properties of the glass substrate.The proposed antenna is designed on a high dielectric constant glass substrate to achieve antenna miniaturization.Because of the existence of gaps between patch units compared with the conventional rectangular patch in the TM10 mode,the radiation aperture of this proposed antenna is reduced.Located right above the center feeding CPW-fed bow-tie slot,the metasurface patch is realized,supporting the TM10 mode and antiphase TM20 mode simultaneously to improve the bandwidth performance.Using a probe-based antenna measurement setup,the antenna prototype is measured,demonstrating a 10-dB impedance bandwidth from 53.3 to 67 GHz.At 60 GHz,the antenna gain measured is about 5 dBi in the boresight direction with a compact radiation aperture of 0.31λ0×0.31λ0 and a thickness of 0.06λ0.
文摘Accurate simulations of ultra-wideband （UWB） electromagnetic radiation from an antenna were developed based on a time-domain finite element method （TDFEM） based on p-step Lagrange interpolation for the temporal expansion. The motivation was to utilize the good interpolation features and straightforward computations for UWB antenna simulations. Numerical results were obtained from the cases of the cavity resonance problem, a bowtie and a Sierpinski bowtie antenna. Comparisons with an existing TDFEM approach employed linear temporal basis functions show good agreement to demonstrate the validity of the present schemes. The TDFEM with 2-step Lagrange interpolation as the temporal basis functions achieves better numerical results with only a small increase to run time and memory use in terms of the relative errors of the resonant frequency in the cavity for the transverse electric mode and the radiation patterns of the bowtie antenna.
