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12th IEEE Asia-Pacific Conference on Antennas and Propagation, APCAP 2024

作者： Wang, Decai Zhang, Xiaolin Xia, Xiaopan Feng, Chenchen The 38th Research Institute of Cetc Key Lab of Aperture Array and Space Application Hefei China

ISBN: (纸本)9798350351019

An ultra wideband wide-angle scanning phased array antenna is designed. It is a banyan tree antenna, of which the radiation curved arm is obtained by stretching a closed envelope which is compose of three exponential curves and a straight *** gradually changing exponential curve envelope of the radiating curved arm greatly expands the impedance bandwidth. Simulated results show that in the frequency band of 30 MHz ∼ 100 MHz, the active voltage standing wave ratio (AVSWR) scanned from 0° to 60° in azimuth plane and from 0° to 30° in elevation plane are all less than 2.5. The simulated 10 × 6 array antennas have excellent ultra wideband wide-angle scanning characteristics. © 2024 IEEE.

关键词： Scanning antennas

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A 1024-channel Wideband Digital Subsystem Prototype for Large aperture array Radio Telescope

A 1024-channel Wideband Digital Subsystem Prototype for Larg...

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2023 IEEE/MTT-S International Microwave Symposium, IMS 2023

作者： Cao, Rui Wu, Manqing Tao, Xiaohui Peng, Guoliang Jiang, Lihui Li, Kun Zhang, Jinzhong Zhang, Hongqi Xu, Xiaorong Rong, Dawei Yang, Huiyue Ye, Ming-Ao Wang, Chao Zhang, Yan Xu, Yulong Yu, Xiaolong Lu, Dehui Zhu, Dezhi Key Lab of Aperture Array and Space Application Hefei China Anhui University School of Electronic Information Engineering Hefei China

ISBN: (纸本)9798350347647

The new generation of aperture array radio telescopes need to process analogue signals from thousands of antennas, including channelization, correlation, and digital beamforming. The huge amount of raw data poses a great challenge to the processing capability of digital processing system. For 400 MHz bandwidth observation signal fed by 1024 antennas, the digital system should be able to process and exchange a real-time data stream of 3.88 Tbps. A 1024-channel digital subsystem prototype developed, which uses Field Programmable Gate array (FPGA) transceivers to implement direct, passive, high-speed serial connections between 16 Chinese Tile Processing Modules (CTPM) in one sub-rack and between different sub-racks, standard 10 Gbit/s Ethernet links are used to transfer data to Graphics Processing Unit (GPU) nodes. The digital sub-system can be flexibly customized and expanded to enable different configurations for 16~1024 and 1024*N analogue inputs. Preliminary experimental results such as channel response and channel correction showed that the prototype system has good channel-to-channel consistency and stability, which is suitable for large-scale aperture array applications. © 2023 IEEE.

关键词： Beamforming

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A Low Loss Broadband Circularly Polarized Magnetic and Electric Dipole Antenna with High Power Capacity and Better Axial Ratio

A Low Loss Broadband Circularly Polarized Magnetic and Elect...

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International Symposium on Antennas, Propagation and EM Theory (ISAPE)

作者： Decai Wang Xiaolin Zhang Lin Guo Chenchen Feng Xiaopan Xia Xiaoyu Zhou Key Lab of Aperture Array and Space Application The 38 Research Institute of CETC Hefei China

ISBN: (数字)9798350353129

ISBN: (纸本)9798350353136

A S-band low loss broadband circularly polarized magnetic and electric dipole antenna with high power capacity and better axial ratio was designed. The antenna is composed of an electric dipole, a magnetic dipole, a feeding balun, and a metal floor. The electric dipole uses a bow-tie dipole, the magnetic dipole uses a folded dipole, and the feeding balun uses a metal coaxial line with $\lambda/4$ V-shaped groove. The electric dipole and the magnetic dipole are symmetrically distributed in a cross shape. The electric dipole is parallel to the metal floor, and the magnetic dipole is perpendicular to the metal floor. Through theoretical analysis and electromagnetic simulation, the results show that the relative bandwidth (VSWR <2) at the center frequency of 3.14 GHz reaches 31°/0, the 3dB axial ratio bandwidth reaches 10°/0, the gain at 3 GHz reaches 6.53 dBi, and the axial ratio of the maximum radiation direction is 0.65 dB.

关键词： Satellite antennas Dipole antennas Antenna theory Baluns Metals Bandwidth Radar antennas Broadband communication Broadband antennas Floors

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A range and radial velocity measurement method based on up-chirp and down-chirp LFM signal in pulsed radar

A range and radial velocity measurement method based on up-c...

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IET International Radar Conference 2023, IRC 2023

作者： Chen, Hao Lei, Yi Key Lab of Aperture Array and Space Application East China Research Institute of Electronic Engineering Hefei China School of Computer Science and Information Engineering Hefei University of Technology Hefei China

ISBN: (纸本)9781839539954

Range accuracy and radial velocity accuracy are important indexes in pulsed radar. However, in pulsed radar using linear frequency modulation (LFM) pulse, the range-Doppler coupling of LFM signal will lead to large range error in high-speed target measurement. The target's radial velocity is computed using range differentiation in traditional method, which is also not accurate. This paper presents a measurement method based on up-chirp and down-chirp LFM signal to get the target's accurate range and radial velocity simultaneously. Experiments confirm that the proposed method outperforms traditional method in both range accuracy and radial velocity accuracy. © The Institution of Engineering & Technology 2023.

关键词： Chirp modulation

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An Ultra Wideband Wide-Angle Scanning Phased array Antenna

An Ultra Wideband Wide-Angle Scanning Phased Array Antenna

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IEEE Asia-Pacific Conference on Antennas and Propagation (APCAP)

作者： Decai Wang Xiaolin Zhang Xiaopan Xia Chenchen Feng Key Lab of Aperture Array and Space Application The 38th Research Institute of CETC Hefei China

ISBN: (数字)9798350351019

ISBN: (纸本)9798350351026

An ultra wideband wide-angle scanning phased array antenna is designed. It is a banyan tree antenna, of which the radiation curved arm is obtained by stretching a closed envelope which is compose of three exponential curves and a straight *** gradually changing exponential curve envelope of the radiating curved arm greatly expands the impedance bandwidth. Simulated results show that in the frequency band of $30 \mathrm{MHz} \sim 100 \mathrm{MHz}$, the active voltage standing wave ratio (AVSWR) scanned from 0° to 60° in azimuth plane and from 0° to 30° in elevation plane are all less than 2.5. The simulated $10 \times 6$ array antennas have excellent ultra wideband wide-angle scanning characteristics.

关键词： Phased arrays Azimuth Bandwidth Voltage Directive antennas Boundary conditions Ultra wideband antennas Impedance

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Design of High-Performance Band-Notched UWB Antenna with Surrogate Models

Design of High-Performance Band-Notched UWB Antenna with Sur...

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IEEE Asia-Pacific Conference on Antennas and Propagation (APCAP)

作者： Yijun Du Key Lab of Aperture Array and Space Application (KLAASA) The 38th Research Institute of China Electronics Technology Group Corporation Hefei China

ISBN: (数字)9798350351019

ISBN: (纸本)9798350351026

Fragment-defined patterns etched on antenna radiator have the potential to generate band notches of sharp roll-off. By defining separate objectives for roll-off criteria (ROCs) of bands to be notched, multi-objective optimization searching of the best etch pattern can be implemented to challenge the high ROCs. To improve the searching efficiency, surrogate models are proposed in the optimization searching, and it reaches a significant promotion of computation cost. For demonstration, dual band notches of ${\mathrm {R O C}}=0.63$ at the WiMAX band and ${\mathrm {ROC}} =0.7$ at the WLAN band are achieved, and the efficiency improvement is up to 40% in the proposed design example.

关键词： Wireless LAN Costs Computational modeling Dual band WiMAX Search problems Ultra wideband antennas Computational efficiency Optimization Antenna radiation patterns

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A 1024-channel Wideband Digital Subsystem Prototype for Large aperture array Radio Telescope

A 1024-channel Wideband Digital Subsystem Prototype for Larg...

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Microwave, MTT-S International Symposium

作者： Rui Cao Manqing Wu Xiaohui Tao Guoliang Peng Lihui Jiang Kun Li Jinzhong Zhang Hongqi Zhang Xiaorong Xu Dawei Rong Huiyue Yang Ming-Ao Ye Chao Wang Yan Zhang Yulong Xu Xiaolong Yu Dehui Lu Dezhi Zhu Key Lab of Aperture Array and Space Application Hefei China School of Electronic Information Engineering Anhui University Hefei China

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Cubesat Task Scheduling Method Considering Operational Reliability

SSRN

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SSRN 2023年

作者： Zhang, Jingjing He, Chenyang Zhang, Yan Qi, Xianjun Yang, Xi School of Electrical Engineering and automation Hefei University of Technology Hefei China Anhui Province Key Laboratory of Renewable Energy Utilization and Energy Saving Hefei University of Technology Hefei China Key Lab. of Aperture Array and Space Application Hefei China

Task scheduling is an effective method to increase the value of satellite missions, which can greatly improve satellite resource management and quality of service. Based on the priority-based task scheduling model, this paper proposes a CubeSat scheduling method that takes operational reliability into account, considering the impact of scheduling results on its reliable operation. In this method, the availab.e energy and the time window are used as scheduling resources, and the average charge state of the lithium battery and the number of task start-ups are defined as two index to measure its reliability. To meet the mission requirements and energy availab.lity of PV and battery constraints, the scheduling model is constructed whose objective function includes mission priority and reliability index. Branch and bound (BB) method and Analytical hierarchy process (AHP) method are used to solve the scheduling problem. The example analysis compares different scheduling results and verifies the effectiveness of the proposed scheduling method. Compared with the existing methods, it comprehensively considers the mission value and operational reliability of the CubeSat, improves the energy reserve level of the CubeSat, reduces the surge current caused by the start-up of the task, and can provide guidance for its task scheduling. © 2023, The Authors. All rights reserved.

关键词： Scheduling algorithms

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A range and radial velocity measurement method based on up-chirp and down-chirp LFM signal in pulsed radar

A range and radial velocity measurement method based on up-c...

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IET International Radar Conference (IRC 2023)

作者： Hao Chen Yi Lei Key Lab of Aperture Array and Space Application East China Research Institute of Electronic Engineering Hefei People's Republic of China School of Computer Science and Information Engineering Hefei University of Technology Hefei People's Republic of China

ISBN: (数字)9781837240982

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Fabrication of Full Glass Antenna-in-Package by Laser Transmission Welding

Fabrication of Full Glass Antenna-in-Package by Laser Transm...

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International Conference on (ICEPT) Electronic Packaging Technology

作者： Yuhua Guo Yunlong Wang Qiangwen Wang The 38th Research Institute Key Lab of Aperture Array and Space Application (KLAASA) China Electronics Technology Group Corporation Hefei China The 38th Research Institute China Electronics Technology Group Corporation Hefei China

For coming 6G applications, next generation of RF integration architecture is pursuing more compact size and relatively low cost by using new materials and 3D integration methods. In this paper, a full glass TGV-based Antenna in Package (AiP) system has been proposed and fabricated by using laser transmission welding technology to realize the sealing and interconnection simultaneously at overall low temperature. Firstly, a 3D AiP system architecture was designed based on AF32 glass material. The bonding area using bumpless pads was defined on each layer. Secondly, the laser transmission welding technology was introduced and applied for the fabrication of the 3D full glass AiP. Finally, the bonding interface was analyzed in micromorphology which indicates a successful bonding of glass-metal-glass layers. And the bonding shear strength was measured under certain conditions. The results show that the bonding strength can reach about 50MPa and still maintain its strength after environment testing.

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