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Analysis of the Reflector Antenna’s Feed Taper Level
2019 IEEE 2nd International Conference on Computer and Communication Engineering Technology (CCET)
Year: 2019 | Conference Paper |
Based on the experimental verification, this paper analyses the changes of antenna gain, sidelobe level, edge coverage gain and aperture efficiency when the taper level of the feed horn changes, and puts forward a range of optimal taper level. By introducing the concept of spatial attenuation of reflector antenna, a more accurate method to determine the taper level is given. Based on the value of ...Show More
Temperature Control Optimization for Heat Pipe Based on Particle Swarm Optimization
2018 Eighth International Conference on Instrumentation & Measurement, Computer, Communication and Control (IMCCC)
Year: 2018 | Conference Paper |
Cited by: Papers (2)
In order to optimize the parameters of heat pipe temperature control during the thermal vacuum test, the particle swarm optimization (PSO) algorithm is used to tune the PID control parameters. According to the heat response data of heat pipe, the temperature control system model of heat pipe is established. The time integral of the absolute value of the control error is selected as the objective f...Show More
A Ka Band Coaxial Three-Reflector Zoom Antenna Based on the Principle of Optical Zoom
2018 International Conference on Microwave and Millimeter Wave Technology (ICMMT)
Year: 2018 | Conference Paper |
This paper presents a novel approach to design zoomable antenna at 30 GHz by using three reflectors and a TE11 mode circular waveguide feed. The main reflector and the feed is designed to remain in a fixed position, and a pair of moveable subreflectors are used as zoom components to control the Half-Power Beamwidth (HPBW). By rearranging the location of two subreflectors based on the principle of ...Show More
A Low Profile Broadband Circularly Polarized Microstrip Antenna
2018 IEEE Asia-Pacific Conference on Antennas and Propagation (APCAP)
Year: 2018 | Conference Paper |
This paper introduces the design and simulation of a broadband circularly polarized microstrip patch antenna. The antenna consists of a circular patch, an air layer and four Lprobes. The distance between the patch and ground is only 0.058 times of the free space wavelength at 0.25GHz, achieving low profile characteristic. The HFSS simulation results show that VSWR is better than 2 in 42.2% bandwid...Show More
Dual reflector zoom antenna based on optical imaging theory for satellites in elliptical orbits
2017 Sixth Asia-Pacific Conference on Antennas and Propagation (APCAP)
Year: 2017 | Conference Paper |
Cited by: Papers (3)
This paper describes a Ka band dual reflector zoom antenna where the Half-Power Beamwidth (HPBW) can be varied dynamically. The goal is to compensate the variation of the coverage area as the satellites traveling in highly elliptical orbits. The proposed zoom antenna contains a parabolic main reflector and a spherical subreflector fed by a fundamental mode circular waveguide. By rearranging the lo...Show More
Beam collecting efficiency analysis in microwave power transmission demonstration system for SSPS
Yazhou Dong;Shi-wei Dong;Ying Wang;Wenli Fu;He Bai;Xiaojun Li;Zhengjun Li
This paper presents a microwave power transmission demonstration system comprehensively simulating the operating mode and validating the functions and efficiency of microwave power transmission technologies for SSPS (Space Solar Power Station). The transmitting antenna array is a planar microstrip antenna array with quasi-Gaussian distribution. The beam collecting efficiency of this system is abou...Show More
Design of high efficiency GaN HEMT class-F power amplifier at S-band
Ying Wang;Shiwei Dong;Lisheng Yang;Zhengjun Li;Yazhou Dong;Wenli Fu
Proceedings of 2014 3rd Asia-Pacific Conference on Antennas and Propagation
Year: 2014 | Conference Paper |
Cited by: Papers (3)
Microwave power transmission is one of the key technologies to realize solar power satellite. In this paper, the authors design a high efficiency GaN Class-F power amplifier at 2.45GHz. Power added efficiency is up to 78.8% and output power is 40.3dBm in simulation. Simulated results predict high performance of the proposed PA.Show More
A polarization auto-matching retrodirective method
Proceedings of 2014 3rd Asia-Pacific Conference on Antennas and Propagation
Year: 2014 | Conference Paper |
Cited by: Papers (1)
A polarization auto-matching retrodirective method is proposed in this paper. Using phase conjugating circuits and polarization rotators, it can receive any polarized pilot signal and generate predictable polarized beam aimed back to the rectenna. Phase conjugation with heterodyne mixing is executed twice to lower LO frequency and reduce phase error. The polarization mismatch loss and interference...Show More
A dual-band equal-beam reflector multiple beam antenna for satellite communications
2012 International Conference on Microwave and Millimeter Wave Technology (ICMMT)
Year: 2012 | Conference Paper |
Cited by: Papers (2)
A dual-band multiple beam antenna (MBA) system that is suitable for satellite communications at K/Ka-band frequencies is introduced in this paper. This antenna system employs a minimum number of reflectors, just half of conventional multiple beam antennas, because it uses a dual-band feed horn. It is shown that the antenna system can provide higher edge-of-coverage (EOC) gain and higher co-polar i...Show More
An Effective Combination of Genetic Operators in Evolutionary Algorithm
2011 Fourth International Symposium on Computational Intelligence and Design
Year: 2011 | Conference Paper |
An evolutionary algorithm (EA) is designed and then is used to solve constrained optimization problems in this paper. The difference of the proposed algorithm from other EAs stays in combination of two crossover operators: one is affine crossover which inherits characteristics of the parents by using function continuity, one is uniform crossover which preserves some discrete genes of the parents b...Show More
The study in fast calculation of Numerical Green Matrix of a surface antenna in a plane
Jiang Zhao;Zong-guang Liao;Dong Zhou;Wei Dong;Yi-hui Lu;Wen-zhen Luo;San-you Zeng;Zheng-jun Li;Hong-yong Jing
2011 International Conference on Electronics, Communications and Control (ICECC)
Year: 2011 | Conference Paper |
In this paper, it is discovered that the correlation matrices of antennas whose scattering surface are within the same plane are diagonal matrices. By applying this conclusion to the Numerical Green Matrix Module in the NEC (Numerical Electromagnetic Code), the memory space used by simulation program is significantly reduced, and the computational speed is improved, when the initial structures are...Show More
Dynamic constrained multi-objective model for solving constrained optimization problem
Sanyou Zeng;Shizhong Chen;Jiang Zhao;Aimin Zhou;Zhengjun Li;Hongyong Jing
2011 IEEE Congress of Evolutionary Computation (CEC)
Year: 2011 | Conference Paper |
Cited by: Papers (11)
Constrained optimization problem (COP) is skillfully converted into dynamic constrained multi-objective optimization problem (DCMOP) in this paper. Then dynamic constrained multi-objective evolutionary algorithms (DCMOEAs) can be used to solve the COP problem by solving the DCMOP problem. Seemingly, a complex DCMOEA algorithm is used to solve a relatively simple COP problem. However, the DCMOEA al...Show More
Dynamic multi-objective differential evolution for solving constrained optimization problem
Lina Jia;Sanyou Zeng;Dong Zhou;Aimin Zhou;Zhengjun Li;Hongyong Jing
2011 IEEE Congress of Evolutionary Computation (CEC)
Year: 2011 | Conference Paper |
Dynamic constrained multi-objective differential evolution (DCMODE) is designed for solving constrained optimization problem (COP). Main feature presented in this paper is to construct dynamic multi-objective optimization problem (DMOP) from COP. The two evolved objectives are original function objective and violation objective. Constraints are controlled by dynamic environments, where the relaxed...Show More
Automated Antenna Design Using Self-adaptive Differential Evolution Algorithm
2011 Fourth International Conference on Intelligent Computation Technology and Automation
Year: 2011 | Conference Paper |
As we knew, an evolved X-band antenna for NASA's Space Technology 5 (ST5) spacecraft had been deployed on schedule in 2006. This paper uses Self-adaptive Differential Evolution Algorithm (SaDE) to solve ST5 antenna design problem. The performance of SaDE is reported on the set of 24 benchmark functions provided by CEC2006 special session on real parameter optimization. The experimental result show...Show More
Design of array fed imaging reflector antenna for monopulse limited scan use
2010 International Conference on Microwave and Millimeter Wave Technology
Year: 2010 | Conference Paper |
The array-fed imaging reflector antenna can form a larger aperture equivalent phased array whose secondary element pattern shaped like a gate with flat-top characteristic, which performs good grating lobe degradability. Based on this configuration, a low cost monopulse limited scan antenna with a regular triangular latticed primary array is presented here. The sum pattern is synthesized by Taylor ...Show More
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