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Experimental qualification and sensitivity study of antipodal patch antenna structures for orientation independent detection of partial discharges

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HIGH VOLTAGE 2024年第3期9卷 674-684页

作者： Friebe, Kerstin Jenau, Frank TU Dortmund Univ Inst High Voltage Engn Dortmund Germany

Partial discharge diagnosis is an important part of monitoring and diagnosing components of the power transmission system. Four different patch antenna structures for the detection of partial discharges are investigated. These patch antennas, which are realisable in a variety of geometric structures, are already the subject of research. They offer the advantage of contactless detection without intervention in the test object or the measuring circuit, and also offer the possibility of alignment independent detection compared to directional antennas. However, it is important and required to examine different structures extensively at the same measurement setup and to compare their performance. To achieve this, four different configurations of patch antenna structures based on basic geometries all in antipodal design are realised: a logarithmic periodic structure, a Hilbert fractal structure and two tapered slot antennas. They are exposed to the same conditions on a special and unique measurement setup. As the main aspect, the performance of orientation independent detection of partial discharges patch antennas with varying distance and rotation in relation to the partial discharge source as well as the operating bandwidth is examined. To rate the structures, an evaluation scheme is created and a sensitivity matrix is generated.

关键词： orientation independent detection contactless detection special measurement setup microstrip antennas partial discharge source Hilbert fractal structure antipodal design Charge measurement partial discharge diagnosis diagnosing components measuring circuit unique measurement setup antipodal patch antenna structures alignment independent detection Single antennas tapered slot antennas directional antennas partial discharge measurement partial discharges patch antennas directive antennas power transmission system Dielectric breakdown and discharges logarithmic periodic structure different patch antenna structures antenna radiation patterns geometric structures slot antennas fractals partial discharges

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Wideband Millimeter Wave Antenna with Cavity Backed slotted Patch and Magneto-Electric Dipole

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Chinese Journal of Electronics 2024年第5期33卷 1234-1244页

作者： Yang CHENG Yuandan DONG School of Electronic Science and Engineering University of Electronic Science and Technology of China

This paper proposes a wideband cavity-backed slotted patch antenna, loaded with a magneto-electric（ME）-dipole and fed by a microstrip line, for millimeter wave（mm-Wave） applications. The coupled-feed cavitybacked slotted patch antenna is loaded with the ME-dipole. The slotted patch antenna serves as both a radiator and a ground for the ME-dipole. The combination of the ME-dipole antenna and the slotted patch antenna realizes a –10 dB impedance bandwidth covering over 22.86–44.35 GHz（63.9%）. The pattern of the antenna element remains stable throughout this bandwidth. The proposed broadband antenna unit not only realizes single linearly polarized（LP）radiation but also can be designed for dual-LP radiation. The dual-polarized radiation can be achieved by changing the slot of the patch antenna to a crossed slot and altering the ME-dipole antenna to a dual-polarization form. A 2 × 2 dual-polarized array has been designed, fabricated, and tested. A novel dual-polarized feeding network is *** achieve higher isolation, broadband in-phase feed and differential feed are adopted, respectively. A low-loss single to the differential structure is proposed for differential feeding. The simulated isolation of the array is higher than 40 d *** results show that the dual-polarized 2 × 2 array has an overlapping bandwidth of 52.3%(|S11| < –10 dB and |S21| < –30 dB) with a peak gain of 14 dBi. The proposed antenna, featuring a wide overall bandwidth, low cost,and good radiation performance, is well suited for mm-Wave applications.

关键词： slot antennas Costs Dipole antennas Patch antennas Magnetoelectric effects Broadband communication Broadband antennas Array antenna Dual-polarized antenna Feeding network Magneto-electric dipole Millimeter-wave (mm-Wave) Patch BROAD-BAND POLARIZED ANTENNA ARRAY PLANAR BALUN

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A Wideband High-Gain Sawtooth slot Array Antenna with Frequency-Scanning at Lower Frequency and Fixed-Beam at Higher Frequency

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Chinese Journal of Electronics 2024年第2期33卷 463-471页

作者： Qiang SUN Yongling BAN Jun HU School of Electronic Science and Engineering University of Electronic Science and Technology of China

Exploring the multifunctional array antenna suitable for complex communication environment has very important research value. In this paper, a millimeter wave(mm-wave) double longitudinal sawtooth slot array antenna(DLSA) based on substrate integrated waveguide(SIW) technology is proposed, which has wideband, highgain and novel beam characteristics. Two irregular longitudinal slots are etched on the SIW conductor surface as the radiation structure. To improve the bandwidth of the DLSA, the metallized vias are added at the transition point of the slots to construct multiple resonant frequency points. By adjusting the size of the slots and the position of the metallized vias, the phase constant can be regulated, and the unusual beam characteristics can be obtained. That is to say, in the lower frequency band, the beam pointing angle increases with frequency. In the higher frequency band,the beam pointing angle is maintained at a fixed angle. Finally, to improve the antenna gain, a 16 × 8 DLSA is fabricated, measured and discussed. The proposed antenna has an impedance matching bandwidth close to 9.7 *** 27 to 33 GHz, the beam pointing angle changes from 8° to 29°. From 33 to 37 GHz, the beam pointing angle is fixed at 29°, and the pointing angle error range is ±1°. In addition, the measured maximum gain is 22.9 d Bi at32 GHz.

关键词： Antenna measurements slot antennas Surface waves Resonant frequency Gain measurement Conductors Frequency measurement

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A Compact Filtering Antenna System with Wide-Angle Scanning Capability for V2I Communication

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Chinese Journal of Electronics 2024年第2期33卷 516-526页

作者： Chuang HAN Tong LI Zhaolin ZHANG Ling WANG Guangwei YANG School of Electronics and Information Northwestern Polytechnical University School of Electronic Engineering and Computer Science Queen Mary University of London

A compact filtering antenna system with wide-angle scanning is proposed for vehicle to infrastructure(V2I) communication which would handle complex communication scenarios. In this work, a wide beam filtering antenna is realized by using some inductive resistance structures such as metal pins and pillars, and capacitive structures such as slots, parasitical patches to produce the radiation nulls at two sides of the operating frequency band and improve the impedance matching in the passband. Meanwhile, the wide beam capability is also realized by the above structure. Furthermore, two H-and E-plane linear arrays are designed for the beam scanning capability with filtering characteristics based on the proposed antenna. To verify the proposed design concept, a prototype is fabricated and measured. The measurement and simulation agree well, demonstrating an excellent filtering characteristic with the operating frequency band from 3.18 to 3.45 GHz(about 8.1%), the high total efficiency of about 88%, and 3-d B-beamwidth of more than 100° and 120° in the above two arrays, respectively. Additionally, the proposed arrays can realize the beam scanning up to the coverage of 112° and 120° with a lower gain reduction and a good filtering characteristic, respectively.

关键词： Antenna measurements Radio frequency Resistance slot antennas Filtering Communication systems Vehicle-to-infrastructure

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A Beam-Steering Broadband Microstrip Antenna with High Isolation

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Chinese Journal of Electronics 2023年第2期32卷 325-333页

作者： JIANG Zhaoneng SHA Yongxin NIE Liying XUAN Xiaofeng School of Computer and Information Hefei University of Technology School of Electronic Science and Applied Physics Hefei University of Technology

In this paper, a 4.2–7.2 GHz(52.6%)beam-steering microstrip antenna was proposed. The proposed antenna consists of three tapered slots and *** three radiation directions of the antenna on the plane are independent of each other, and the three feeds correspond to the three radiation structures. Symmetry isolation trenches are introduced to improve isolation between different ports. Radiation pattern simulation and measurement show horizontal beam steering at the sampled frequencies of 4.2, 5, 6, and 7.2 GHz. The results shows that the overlapped beam of the three ports in the Eplane and H-plane can cover more than 200 degrees and 60degrees, respectively. Apart from the capability of beamsteering, high isolation(more than 28 d B) of the proposed antenna in the operating band is obtained.

关键词： Antenna measurements Mutual coupling slot antennas Microstrip antennas Antenna feeds Frequency measurement Broadband antennas

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Numerical Study of Spontaneous Outspread of Large-Scale Surface-Wave Plasma Excited by slot-Antenna Array

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Chinese Physics Letters 2009年第3期26卷 170-173页

作者：蓝朝晖胡希伟刘明海 College of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan 430074

The spontaneous outspread of surface-wave plasma studied using a time-stepping self-consistent model. （SWP） towards the edge of large-scale quartz window is The performances of three different types of slot-antenna arrays are compared, and the electron density distributions for each array at different stages are presented. The results show that slotting along both x and y directions can be helpful to the outspread and can thus enhance the uniformity of SWP. Meanwhile, when we use such an array, the absorption rate of input microwave power can reach more than 83%.

关键词： PLASMA waves SURFACE waves (Fluids) EXCITED state chemistry slot antennas ELECTRON distribution NUMERICAL analysis

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On the Use of Multiple antennas to Reduce MAC Layer Coordination in Ad Hoc Networks

On the Use of Multiple Antennas to Reduce MAC Layer Coordina...

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2008 IEEE International Conference on Communications(ICC 2008)

作者： Raymond H.Y.Louie Matthew R.McKay Iain B.Collings Telecommunications Lab School of Electrical and Information EngineeringUniversity of SydneyAustralia Wireless Technologies Laboratory ICT CentreCSIROSydneyAustralia Department of Electronic and Computer Engineering Hong Kong University of Science and TechnologyHong Kong

This paper investigates an important tradeoff in wireless ad hoc networks concerning the allocation of resources to the PHY and MAC *** compare two approaches:One which employs a non-coordinated slotted ALOHA MAC with multi-antenna PHY,and one which employs a tightly coordinated MAC and single-antenna *** both cases,we derive new closed-form throughput *** on these,we show that using simple slotted ALOHA in conjunction with multiple antennas can provide a higher throughput than fully coordinated access protocols in various practical *** results are confirmed through comparison with Monte Carlo simulations.

关键词： Ad hoc networks Physical layer Throughput Media Access Protocol Peer to peer computing Interference slot antennas Time division multiple access Array signal processing Paper technology

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Design of 77GHz Vivaldi Antenna for Millimeter Wave Communication

Design of 77GHz Vivaldi Antenna for Millimeter Wave Communic...

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2002 3rd International Conference on Microwave and Millimeter Wave Technology

作者： L P Chong P T Ng Wen Wang Jeffrey S Fu School of Electrical and Electronics Engineering Nanyang Technological University Nanyang Avenue Singapore 639798

＜正＞The antenna was fed by a unilateral fin line and then transmitted to its taper slotline *** design and fabrication of the substrate containing the fin line transmission section and tapered slot rediating section were carried *** waveguides were also designed to house the fin line section of the substrate. Simulations were carried out using XFDTD software to determine the radiating characteristic of the antenna.A set of S-parameter and polarization curves of designed 77GHz were shown.

关键词： Vivaldi antennas Millimeter wave communication Frequency Impedance Millimeter wave technology slot antennas slotline Dielectric substrates Dielectric constant Dielectric losses

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