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The transient scattering mechanism of dipole array with reflector

Chinese Physics B 2008年第2期17卷 608-617页

作者：张雪芹王均宏李增瑞 Key Laboratory of All Optical Network & Advanced Telecommunication Network Ministry of Education Institute of Lightwave Technology Beijing Jiaotong University

The transient backscattering mechanisms of a dipole array with reflector have been investigated from different aspects： time-domain, frequency-domain, and combined time-frequency domain, using 4 × 8 dipole arrays with reflector as an example. The data of scattering from the arrays under the incidence of Gaussian pulses are obtained by finite differential time domain method. The influences of the array structural parameters, incident wave parameters, and incident angles on the waveforms, spectrum, and time-frequency representations of the backscattered fields of the arrays are analysed and conclusions are drawn. From these characteristics and conclusions, it is possible to deduce the array structure inversely from the backscattered field.

关键词： dipole array reflector scattering time domain

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Novel Method for Sidelobe Level Suppression in Multielement Angled dipole array Antennas

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IEEE ACCESS 2022年 10卷 100215-100223页

作者： Wang, Heesu Byun, Gangil Park, Yong Bae Park, Ikmo Ajou Univ Dept Elect & Comp Engn Suwon 16499 South Korea Ulsan Natl Inst Sci & Technol Dept Elect Engn Ulsan 44919 South Korea

In this paper, we propose a one-dimensional (1D) array antenna with improved sidelobe level (SLL) and cross-polarization (x-pol) characteristics. The array elements constituting the 1D array antenna comprise different numbers of dipole elements, and each array element has a different gain and E-field phase. The positions of the array elements in the z-axis direction are adjusted to equalize their E-field phases in the far field, and the array elements are arranged symmetrically with respect to the z-axis to obtain a low x-pol. The same amount of power is supplied to all the array elements of the 1D array antenna of the proposed structure. Therefore, a complexly structured feeding network is not required to achieve a low SLL and low x-pol. The gain of the proposed array antenna with a corporate feeding network is 15.2 dBi, and its SLL and x-pol level are-21.3 dB and 20.3 dB, respectively. The-10 dB impedance bandwidth of the proposed array antenna is 35.6% (8.3-11.9 GHz).

关键词： Antenna arrays dipole antennas Gain measurement Phased arrays Antenna radiation patterns Reflector antennas Impedance Millimeter wave devices dipole array endfire antenna X-band low sidelobe level millimeter-wave antenna printed dipole

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Single-layer dipole array for linear-to-circular polarisation conversion of slotted waveguide array

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IEE PROCEEDINGS-MICROWAVES ANTENNAS AND PROPAGATION 1996年第3期143卷 211-216页

作者： Min, KS Hirokawa, J Sakurai, K Ando, M Goto, N Faculty of Engineering Department of Electrical and Electronic Engineering Tokyo Institute of Technology Tokyo Japan

A single-layer linear-to-circular polarisation converter is proposed for an application to a slotted waveguide planar array. It consists of dipoles which closely couple to slot arrays. The method of moments clarifies the mutual coupling between the dipoles and the slots on the waveguide, Numerical results promise the use of a uniform and parallel dipole array as a single-layer linear-to-circular polarisation converter for an existing linearly polarised slotted waveguide array. The measurements using a linearly polarised slotted waveguide array in 22.0 GHz band confirm the prediction;the axial ratio less than 1 dB and a negligible insertion loss is realised.

关键词： dipole array rectangular waveguide slot polarisation converter

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TRANSIENT-RESPONSE OF A RECEIVING dipole array - BOUNDS AND MAXIMIZATION

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IEEE TRANSACTIONS ON ELECTROMAGNETIC COMPATIBILITY 1988年第2期30卷 122-129页

作者： BAYARD, JPR SCHAUBERT, DH Department of Electrical and Computer Engineering University of Massachusetts Amherst MA USA

The optimum solution for a receiving array of dipole antennas connected to a load through a feed network is obtained. It is given in terms of the incident electric field waveform that maximizes, at a specific time t/sub 0/, the received voltage across a specified load impedance. This result is used to set an upper limit on the peak voltage that the antenna can deliver to a load, thus providing guidelines for the design of pulse-protection circuits. The analysis uses the method of moments to approximate the currents induced in the wires by the incident field and S-parameter techniques to describe the feed incident electromagnetic plane waves. The Lagrange multiplier technique is then used to maximize the receive load voltage. The solutions presented are based on an idealized model for the feed network; however, the analysis can be extended easily to account for loss and asymmetry of physically realizable feed networks.

关键词： load voltage METHOD OF MOMENTS TRANSIENT RESPONSE Load Impedance ANTENNA dipole array Bound voltage spikes Maximize dipole ANTENNAS LOAD FEEDS

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Wideband dipole array Loaded Substrate Integrated H-Plane Horn Antenna for Millimeter Waves

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IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION 2017年第10期65卷 5211-5219页

作者： Wang, Jingxue Li, Yujian Ge, Lei Wang, Junhong Chen, Meie Zhang, Zhan Li, Zheng Beijing Jiaotong Univ Inst Lightwave Technol Beijing 100044 Peoples R China Shenzhen Univ Coll Elect Sci & Technol Shenzhen 518060 Peoples R China

A novel dipole array loaded substrate integrated H-plane sectoral horn antenna with a simple three-layered geometry is proposed. The dipole array integrated into two extra dielectric strips is connected to the top and bottom edges of the horn aperture. Both the horn aperture and the dipole array are effectively radiated together. A wide impedance bandwidth of 44% for vertical bar S-11 vertical bar < -10 dB that can cover the entire Ka-band is verified by a fabricated prototype. Additionally, stable symmetrical radiation pattern with low cross polarizations, low backward radiation, and gain up to 12 dBi with a variation of 3 dB can also be obtained throughout the whole operating band. The proposed antenna provides a new mean to design wideband substrate integrated horns with excellent endfire radiation, which would be attractive for future wideband and multiband millimeter-wave wireless applications, including the fifth generation (5G) mobile communications and the WiGig system.

关键词： Complementary source antenna dipole array endfire radiation fifth generation (5G) millimeter waves substrate integrated horn antenna

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EFFECTS OF METAL FENCES ON THE SCAN PERFORMANCE OF AN INFINITE dipole array

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IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION 1990年第5期38卷 683-692页

作者： LEE, JJ Hughes Aircraft Company Fullerton CA USA

A theoretical method is presented to investigate the scan characteristics of a dipole array in the presence of thin metal fences along the H-plane. The basic idea of the analysis is to determine the current distribution on the dipole which interacts with the metal fence in the unit cell, so that the active impedance of the element can be computed. This was accomplished by using the moment method and imposing the boundary conditions on the tangential electric fields along the dipole and the metal fence. Since the scan performance in the H-plane is not affected by the fences, the discussion is concentrated on the E-plane behavior. It was found that for a given element spacing and dipole geometry there is an optimum fence height at which the E-plane performance can be most improved. For a typical dipole array geometry the optimum fence height is about 0.4 lambda . It was thought that when the fences are to high and the beam is scanned too far from broadside, transverse magnetic (TM) surface waves propagating in the E-plane direction near the corrugated plane would be excited. However, no such sensitive cases were encountered in the study.

关键词： METHOD OF MOMENTS Metals dipole array scanning Electric current distribution dipoles fencing unit cell

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Low Cost Printed dipole array Antenna for 5G Sub-6GHz Base Stations Implementing Beam-tilting, Ground-backing, and Series-Feeding

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ELECTROMAGNETICS 2021年第8期41卷 612-625页

作者： Yazdani, Reza Aliakbarian, Hadi Vandenbosch, Guy A. E. KN Toosi Univ Technol KNTU Sch Elect Engn Wireless Terminal Measurements WiTem Lab Tehran Iran KU Leuven Univ Elect Engn Dept Leuven Belgium

An antenna array dedicated to wideband 5 G sub-6 GHz base station applications is presented. It combines several features to arrive at a very effective and low-cost topology. Printed dipole elements printed on both sides of a single substrate are used to reach a sufficient -10 dB bandwidth of 25.3%. The eight dipole elements are series-fed, which is ideal to realize down-tilt beam shaping in the E-plane. Ground-backing makes the antenna unidirectional with a peak realized gain of more than 9 dBi over the entire band, with a maximum of 12 dBi at 3.5 GHz. The array has a half-power beamwidth (HPBW) varying between 35 degrees and 47 degrees in E plane and between 82 degrees and 86 degrees in H-plane, respectively. The antenna is compared to similar designs in literature and reaches a superior performance.

关键词： 5G shaped beam antennas dipole array base station antennas

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Improved compensation for the mutual coupling effect in a dipole array for direction finding

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IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION 2003年第9期51卷 2498-2503页

作者： Hui, HT Nanyang Technol Univ Dept Elect & Elect Engn Singapore 639798 Singapore

A new and practical method is proposed to compensate for the mutual coupling effect in a dipole array deployed for direction finding. This method does not require the known current distributions on the antenna elements or the known elevation angles of the incoming signals. A new definition of mutual impedance is introduced to characterize the effect due to mutual coupling between dipole elements. The new mutua I impedances are calculated based on an estimated current distribution. It is shown that current method has a significantly better ability to compensate for the mutual coupling effect than previous methods. Computer simulations using the MUSIC algorithm are provided to demonstrate this method.

关键词： dipole array MUSIC algorithm mutual coupling effect mutual impedance

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Analytical Estimation of Radar Cross Section of Arbitrary Compact dipole array

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APPLIED COMPUTATIONAL ELECTROMAGNETICS SOCIETY JOURNAL 2014年第9期29卷 726-734页

作者： Sneha, H. L. Singh, Hema Jha, R. M. CSIR Natl Aerosp Labs Ctr Electromagnet Bangalore 560017 Karnataka India

This paper presents the scattering estimation and analysis of an arbitrary phased array with parallel, centre-fed dipole elements, in the presence of mutual coupling. The total Radar Cross Section (RCS) of the uniform dipole array is computed by considering the signal reflections within the array system. The results are shown for two types of feed networks, viz, series feed and parallel feed. The scattering due to higher order reflections and edge effects are neglected. The analytical formulae presented for array RCS emphasize the dependence of scattered field on the design parameters, like dipole length, inter-element spacing, geometrical and electrical properties of phase shifters, couplers and terminal impedances. The results indicate that the mutual coupling effect on the overall RCS pattern is identical for both equal and unequal length dipole arrays. This paper identifies the design parameters that can be optimized towards the RCS control of phased array. These parameters include dipole-length, geometric configuration and terminal impedance.

关键词： dipole array feed network impedance mismatch Radar Cross Section (RCS) reflection transmission

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dipole array Loaded Substrate Integrated E-plane Horn Antenna With Improved Radiation Performance

Dipole Array Loaded Substrate Integrated E-plane Horn Antenn...

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6th IEEE MTT-S International Wireless Symposium (IWS) part of China Microwave Week

作者： Bi, Yingyu Li, Yujian Wang, Junhong Beijing Jiaotong Univ Inst Lightwave Technol Beijing Peoples R China

ISBN: (纸本)9781728107165

In this paper, a dipole array loaded substrate integrated E-plane horn antenna is designed. The substrate integrated horn and the loaded dipole array are respectively integrated in different layers of the substrates, and work together to improve the radiation characteristics of the overall antenna. A wide impedance bandwidth of 44% for vertical bar S-11 vertical bar < -10 dB (from 26-40 GHz) is obtained. In addition, the proposed antenna has improved radiation patterns with cross polarization below -30 dB, low backward radiation and a gain up to 12dBi over the entire operating band.

关键词： Substrate integrated E-plane horn antenna complementary source antenna dipole array millimeter wave

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