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Simulation of a dual-polarized printed dipole antenna with a rectagular cavity 11

Simulation of a dual-polarized printed dipole antenna with a...

引用

11th IEEE Asia-Pacific Conference on Antennas and Propagation, APCAP 2023 - Proceedings

作者： Wang, Qian Zhang, Jianchuan Liu, Jiaqi Fang, Zhongyi Fang, Liang Zhang, Junrui The Research Institute for Special Structures of Aeronautical Composite Avic The Aeronautical Science Key Lab for High Performance Electromagnetic Windows Shandong Ji'nan China School of Information Science and Engineering Harbin Institute of Technology at Weihai Weihai264209 China Beijing Institute of Space Long March Vehicle National Key Laboratory of Science and Technology on Test Physics & Numerical Mathematics Beijing100076 China Shandong University at Weihai Weihai264209 China

ISBN: (纸本)9798350326277

This paper presents the design of a dual-polarized printed dipole antenna operating at 2GHz. In order to enhance the radiation characteristics of the antenna, a rectangular metallic cavity is positioned beneath the printed dipole *** antenna utilizes an exponentially tapered geometric shape for the printed dipole radiator, and it is fed using CPW technology. To mitigate mutual interference between the feeding structures, a bridge structure is implemented for one of the polarization ports. Electromagnetic simulation is conducted to evaluate the performance of the dual-polarized antenna. © 2023 IEEE.

关键词： dipole antenna dual-polarized antenna printed antenna rectangular cavity

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Suppressing the Effects of Ionospheric Scintillation on Geosynchronous SAR by Optimised Orbit Design

Suppressing the Effects of Ionospheric Scintillation on Geos...

引用

International Conference on Radar Systems

作者： YuanHao Li XiangRong Liu Cheng Hu XiChao Dong Beijing Institute of Technology Beijing Beijing CN National Key Laboratory of Science and Technology on Test Physics and Numerical Mathematics 100076 China Beijing Key Laboratory of Embedded Real-time information Processing Technology 100081 China

ISBN: (纸本)9781785616723

An L band geosynchronous synthetic aperture radar (GEO SAR) will be sensitive to ionosphere scintillation because of its low carrier frequency. Meanwhile, because of the high orbit, GEO SAR has a higher probability to meet ionospheric scintillation. In this paper, we propose an orbit strategy for eliminating the impacts of ionospheric scintillation. It is realized by selecting a proper orbit element (time past perigee) to avoid imaging for the sensitive region of ionospheric scintillation during the eruption time interval of ionospheric scintillation with the highest probability. Finally, the simulation based on systems tool kit (STK) software was conducted to verify the effectiveness of the method.

关键词： Geosynchronous SAR Ionospheric scinitllation Orbit design SAR imaging

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Investigation of the SISAR imaging of the ground moving target under multipath interference

Investigation of the SISAR imaging of the ground moving targ...

引用

IEEE national Conference on Radar

作者： Xiaoliang Li Cheng Hu Dazhi Zeng Teng Long Xiangrong Liu School of Information and Electronics Beijing Institute of Technology Beijing China Test Physics & Numerical Mathematical National Key Laboratory of Science and Technology Beijing China

In the ground-based FSR, the strong ground reflected signal seriously cancel the useful signal, as a result the estimation methods of the target images in current SISAR imaging technology are no longer applicable. The height difference of the target can't be estimated from the amplitude of complex profile function (CPF). In this paper, firstly, the multipath interference on the forward scatter (FS) signal model and imaging results of the moving target are analyzed by the two ray path model. Then, the estimation methods of the target profile image under multipath interference condition are presented. As a result, the accurate target images that cannot be achieved by using the current imaging algorithm can be extracted using the modified imaging algorithm. Finally, the effectiveness of the estimation methods is validated by the simulations.

关键词： Imaging Estimation Reflection Radar imaging Interference Radar scattering

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Statistical analysis and simulation method of forward scattering clutter in bistatic radar

Statistical analysis and simulation method of forward scatte...

引用

IET International Radar Conference 2013

作者： Chuan-fang Zhang Chang-jiang Liu Cheng Hu Xiang-rong Liu School of Information and Electronics Beijing Institute of Technology China 100081 National Key Laboratory of Science and Technology on Test Physics & Numerical Mathematical Beijing China

The research of statistical properties and simulation methods of radar clutter have vital importance to the design, simulation and development of radar systems. Based on the analysis of some experimental data of forward scattering radar (FSR) clutter, it was found that under low wind speed and narrow dynamic range, the amplitude of FSR clutter was subject to K distribution; while under high wind speed or wide dynamic range, it was subject to lognormal distribution; the clutter power spectrum was subject to the fourth-order all-pole model. With the above statistical analysis, the forward scatter coherent clutter was simulated using a method combining zero-memory nonlinear transformation with spherically invariant random process. The statistical characteristics of the simulated clutter were identical to those of the measured clutter, which verified the validity of this method.

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Periodic Structures and Its Interaction to EM Wave Spectrum, Ideas From X-Ray to MW Wave

Periodic Structures and Its Interaction to EM Wave Spectrum,...

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International Applied Computational Electromagnetics Society Symposium (ACES)

作者： Yunhui Tang Lu Gao Ruzhi Wang Shengjun Zhang Hang Song Yuning Zhang Xia Ai Lei Xie Luting Jiao Xiaoling Zhang Jing He Jiaqi Liu Beijing University of Technology Beijing China National Key Laboratory of Science & Technology on Test Physics and Numerical Mathematics Beijing China Beijing Institute of Space Long March Vehicle Beijing China

X-ray is an important tool for characterizing materials, which is based on the idea that all crystals are composed of atoms or molecules stacking in a particular type, basically expressing as unit cell, diffracting the incident ray with a proper type. In analogue, the periodic structures which are mostly constructed artificially show special desired properties, such as the properties of grating, frequency selective surfaces, metamaterials and metasurface. In this paper, A study was done on the insight of the relation of wave interaction with periodic structures based on X-ray diffraction and control of electromagnetic waves.

关键词： Frequency selective surfaces Stacking Electromagnetic scattering Crystals X-ray diffraction Metasurfaces Computational electromagnetics

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Dual-Polarized Filtering Antenna for Base Station Application

Dual-Polarized Filtering Antenna for Base Station Applicatio...

引用

International Conference on Microwave and Millimeter Wave technology Proceedings

作者： Chao Feng Ding Xiu Yin Zhang Zhi Jie Zhang Yun Fei Cao Lu Gao Jun Yang School of Electronic and Information Engineering South China University of Technology Guangzhou China The State Key Laboratory of Millimeter Waves Nanjing China National Key Laboratory of Science and Technology on Test Physics and Numerical Mathematics Beijing China

In this paper, a broadband dual-polarized filtering dipole is proposed for base station application. Filtering response is obtained by adding simple slits on each arm of the traditional dual polarized dipole antenna. Both lower and upper stopband radiation nulls are generated. The operating bandwidth of the proposed antenna is 1.7-2.9 GHz (52%). The out-of-band suppression level is about 10 dB within 0.69-1.5 GHz and 3.3-3.8 GHz. The simulated port isolation is more than 26 dB. The proposed antenna element is suitable for potential base station applications.

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PolSAR Image Edge Detection via Structure Tensor Analysis

PolSAR Image Edge Detection via Structure Tensor Analysis

引用

IEEE International Geoscience and Remote Sensing Symposium

作者： Xiangrong Liu Wei Mao Shunsheng Zhang Lei Wu Wen-Qin Wang National Key Laboratory of Science and Technology on Test Physics and Numerical Mathematics Beijing China Sch. of Info. Comm. Engin. University of Electronic Science and Technology of China Chengdu China

The weighted structure tensor (ST) can be usually used on edge detection of multi-channel images, including polarimetric synthetic aperture radar (polSAR) images. The traditional weighting method is average weighting, each channel considered to provide the same edge information. But in fact different channels tend to contain different amount of edge information, so the traditional weighting method cannot be adopted to extract full edge information of the multi-channel images. This letter proposes a novel weighting method for ST, in which the weight of each channel is obtained by the eigenvalue-measured way. Experimental results show that the proposed method outperforms the traditional method on edge detection.

关键词： Image edge detection Eigenvalues and eigenfunctions Estimation Optical imaging Hyperspectral imaging Corner detection

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Two-Dimensional Imaging With Stationary Nonuniform Frequency Diverse Array Transmitter

Two-Dimensional Imaging With Stationary Nonuniform Frequency...

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IEEE International Geoscience and Remote Sensing Symposium

作者： Xiangrong Liu Wei Mao Lei Wu National Key Laboratory of Science and Technology on Test Physics and Numerical Mathematics Beijing China Sch. of Info. Comm. Engin. University of Electronic Science and Technology of China Chengdu China

This paper proposes a simple two-dimensional imaging via stationary nonuniform frequency diverse array (FDA) transmitter by exploiting FDA both range and angle dependent transmit beampattern. The nonuniform FDA transmitter only generates range-dependent beampattern, so that two-dimensional (range-angle dimension) imaging of targets can be achieved without the employment of moving radar platform, by jointly utilizing the only range-dependent transmitter beampattern and general single-antenna or phased-array antenna. The effectiveness of the proposed method is verified by simulation results.

关键词： Radar imaging Imaging Frequency diversity Radar antennas Transmitters Radar remote sensing

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Design and Simulation of a Planar Printed Slot Array Antenna

Design and Simulation of a Planar Printed Slot Array Antenna

引用

2023 IEEE International Workshop on Electromagnetics: Applications and Student Innovation Competition, iWEM 2023

作者： Xiaofei, Shi Jiaxin, Shi Jiaqi, Liu Zhongyi, Fang Lei, Wang Lizhong, Song Shandong Institute of Space Electronic Technology Yantai264003 China Harbin Institute of Technology School of Electronics and Information Engineering Harbin150001 China Harbin Institute of Technology at Weihai School of Information Science and Engineering Weihai264209 China Beijing Institute of Space Long March Vehicle National Key Laboratory of Science and Technology on Test Physics & Numerical Mathematics Beijing100076 China Shandong Huayu Aerospace Technology Co. Ltd Yantai264003 China

ISBN: (纸本)9798350336740

This paper designs an array antenna with a planar printed structure. The antenna element adopts a rectangular slot antenna, and the antenna element is excited by a T-shaped feeding structure. The microstrip power distribution network is used to feed the antenna radiator array with equal power. The microstrip power distribution network and slot radiator array are located on top and bottom of dielectric substrate, and the array antenna is implemented by use of the printed circuit technology. In order to improve the gain, a metal reflector ground is placed below the dielectric substrate. A planar printed slot array antenna working in X band is designed. The coaxial line is used to feed the array antenna at the bottom. The whole antenna structure is easy to feed and suitable for fabrication. The designed array antenna was numerically calculated using full wave electromagnetic simulation software. At a working frequency of 10.1GHz, the voltage standing wave ratio (VSWR) of the antenna is about 1.35, and the gain is about 21.46dB. The design of the antenna scheme can be used as a reference for the actual application of engineering. © 2023 IEEE.

关键词： Slot antennas

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X-band narrowband high-temperature super-conducting filter with high selectivity

X-band narrowband high-temperature super-conducting filter w...

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IET International Radar Conference 2015

作者： L. Gao Z. Y. Jiang J. Q. Liu H. Y. Liu J. L. Bai F. Xu H. Li S. Y. Chen L. Sun Y. B. Bian J. Wang Y. S. He National Key Laboratory of Science and Technology on Test Physics and Numerical Mathematics P.O. box 9200 Beijing 100076 China Chinese Academy of Sciences Beijing Beijing CN

ISBN: (纸本)9781510822023

This paper presents a development of a narrowband hightemperature superconducting filter with high selectivity. The center frequency of this filter is 8.625 GHz and the 3 dB bandwidth is 156 MHz (a fractional bandwidth of 1.81 %). In order to achieve high band edge steepness, we introduce a 10-resonator quasi-elliptic function response with two pairs of transmission zeros in the cascaded quadruplet coupling structure. The filter was manufactured on a 2-in-diameter 0.5-mm-thick MgO wafer with double-sided YBCO films. The measured results show a midband insertion loss of 0.58 dB and a return loss better than 16 dB. Band edge steepness reaches over 3.82 dB/MHz at both the high and low frequency edges. The 60 dB rectangle ratio is less than 1.19. The out-of-band rejection is over 60 dB at 17.8 MHz from the 3 dB band edge.

关键词： High-temperature superconducting (HTS) X-band microwave filter transmission zeros

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