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Electrodynamic Analysis and Synthesis of Band-pass Filters on a rectangular Waveguide with Complex Thin Resonant Diaphragms in the Form of a Double-Shaped C-aperture

Electrodynamic Analysis and Synthesis of Band-pass Filters o...

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Radiation and Scattering of Electromagnetic Waves (RSEMW)

作者： Sergey V Krutiev Daria V. Lonkina Svetlana S. Efremova Andrey S. Ipatiev Physics Faculty Southern Federal University Rostov-on-Don

A thin resonant single diaphragm with an aperture in the form of a double C-shaped contour is considered. An electrodynamic analysis of this type of diaphragm is carried out. The dependences of the frequency response on the geometric dimensions of the aperture are studied. The possibility of creating band-pass filters on the WR137 waveguide is shown. A computer model of a three-section and five-section band-pass filter is developed. The design of the filters was carried out on a Duroid 5880 substrate. The proposed diaphragm topology makes it possible to obtain higher Q-factors of the resonators and a minimum level of losses in the passband, in comparison with the classical rectangular resonant window.

关键词： Band-pass filters Q-factor Electrodynamics Resonator filters Electromagnetic scattering rectangular waveguides Apertures

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340GHz two-beam folded waveguide traveling-wave amplifier

340GHz two-beam folded waveguide traveling-wave amplifier

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International Conference on Infrared and Millimeter Waves

作者： Ke Li Wenxin Liu Yong Wang Miaomiao Cao University of Chinese Academy of Sciences Beijing China Key Laboratory of High Power Microwave Sources and Technologies Chinese Academy of Sciences Beijing China Institute of Electronics Chinese Academy of Sciences Beijing CN

ISBN: (纸本)9781479938780

The design of a 340GHz two-beam folded waveguide (FW) traveling-wave amplifier with >4 W of power over with the input power of 20mW is presented. The amplifier is driven by two electron guns (70mA×2, 14.9kV) and 1T magnetic field. The design is performed by CST Particle Studio. Particle-in-cell (PIC) simulations were carried out to predict and optimize the performance of the folded waveguide TWT.

关键词： Power generation Power amplifiers Microwave amplifiers Microwave circuits Electron beams rectangular waveguides Trajectory

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Control of the radiation properties of a FSS loaded leaky-wave antenna

Control of the radiation properties of a FSS loaded leaky-wa...

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European Conference on Antennas and Propagation, EuCAP

作者： M. García-Vigueras J. L. Gómez-Tornero R. Guzmán-Quirós F. Quesada-Pereira A. Alvarez-Melcón Department of Communication and Information Technologies Technical University of Cartagena Cartagena Murcia Spain

This work presents a novel leaky-wave antenna (LWA), conceived from the insertion of a dipole-based frequency selective surface (FSS) into a top-open rectangular waveguide. It is explained how the printed circuit has the ability to control the radiation rate of the leaky modes that propagate through this structure at a certain frequency. This attribute makes possible the tapering of the radiation diagram of the LWA. In particular, it is possible to reduce the sidelobes level. This feature will be illustrated by performing a cosine tapered design. Good agreement is observed when comparing the results obtained from leaky-mode theory with full-wave simulations. Finally, the limitations of this tapering procedure will also be presented.

关键词： Frequency selective surfaces Leaky wave antennas Antennas and propagation Hollow waveguides Communication system control Dipole antennas Dielectric losses Information technology rectangular waveguides Printed circuits

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Experimental and theoretical study of novel grooved horn antenna

Experimental and theoretical study of novel grooved horn ant...

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Antennas and Propagation Society International Symposium

作者： W.M. Shi K.F. Tsang W.X. Zhang Department of Electronic Engineering City University of Hong Kong Hong Kong China Department of Radio Engineering South-East University Nanjing China

Horn antennas play a very important role in microwave engineering. To meet different kinds of need, several types of horn including conical, pyramidal, ridge-loaded, corrugated horns, etc. have been developed and studied extensively. These horns can be classified as pure mode or multi-mode horns due to the field distribution (waveguide mode) on the apertures. In this paper, a new grooved type of horn with a cross-section similar to a groove guide is presented. Initial work shows that such horns have the advantages of more flexible design and pure mode operation and hence excitation is easy. Various radiation patterns can be obtained by choosing appropriate cross-section shape and size.

关键词： Horn antennas Antenna theory Shape Apertures Pattern analysis Antenna measurements rectangular waveguides Manufacturing Antenna radiation patterns Propagation losses

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A Surface Mountable Pyramidal Horn Antenna and Transition to Substrate Integrated Waveguide

A Surface Mountable Pyramidal Horn Antenna and Transition to...

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URSI International Symposium on Signals, Systems, and Electronics (ISSSE)

作者： Zhaolong Li Xiao-Ping Chen Ke Wu Poly-Grames Research Center Department of Electrical Engineering Ecole Polytechnique University of Montreal Montreal QUE Canada

This paper reports and demonstrates for the first time a surface mountable horn antenna and also a transition from substrate integrated waveguide (SIW) to standard rectangular waveguide for microwave and millimeter-wave system applications. The proposed horn antenna and the transition can be installed or surface-mounted on top of the metal housing of a planar SIW circuitry as easy as a "cap". The transition is designed as a waveguide quarter-wave stepped impedance transformer. Simulation and measurement results over K-band are given in this paper.

关键词： Surface waves Horn antennas Waveguide transitions rectangular waveguides Microwave antennas Millimeter wave integrated circuits Millimeter wave measurements Surface impedance Circuit simulation Antenna measurements

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CORRECTION

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IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES 1978年第1期26卷 44-44页

作者： RAHMATSAMII, Y Department of Electrical Engineering University of Illinois Urbana-Champaign Urbana IL USA

In the above paper, the following typographical errors should be corrected.

关键词： Green's function methods Apertures rectangular waveguides Conductors Planar waveguides Error correction Microwave theory and techniques Availability Admittance Costs

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rectangular waveguide shape folded patch antenna

Rectangular waveguide shape folded patch antenna

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Antennas and Propagation Society International Symposium

作者： Xiaoyu Cheng James J. Whalen Yong-Kyu Yoon Electrical Engineering State University of New York University at Buffalo Buffalo NY USA

ISBN: (纸本)9781424449675

In this work, an quasi-omnidirectionally radiating, compact, folded patch antenna in a rectangular waveguide shape is demonstrated, where the folded ground plane of the patch antenna creates an EMI protected enclosed space and it can be used for electronic circuit implementation with little EMI from the patch antenna. An analysis on the EMI of a rectangular structure in a high speed digital system is available [6]. The demonstrated antenna can be used for a variety of commercial, military and bio-medical applications such as a compact GPS and a wireless endoscope for gastro-intestine monitoring etc..

关键词： Patch antennas Antenna measurements Electromagnetic interference Shape Antenna radiation patterns rectangular waveguides

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Influence of Transmitter Position and Dielectric Constant on Electromagnetic Waves Propagation in Mine Tunnel

Influence of Transmitter Position and Dielectric Constant on...

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International Conference on MultiMedia and Information Technology, MMIT

作者： Shuqi Wang Xiaobing Han School of Communication and Information Engineering Xi''an University of Science and Technology Xi'an China

In order to research the influence of propagation character of electromagnetic wave caused by the different positions transmitter and dielectric constant in mine tunnel, the approximate solutions of the electomagnetic attenuation character are analyzed which polarized in different ways based on the rectangular tunnel transmission mode. The propagation characters of different position transmitter in rectangular mine tunnels are simulated. Base on the propagation mode of rectangular tunnels, the influences of dielectric constant between side walls and roof-floor of rectangular tunnels on attenuation rate of electromagnetic wave propagation in different polarization modes were studied. When dielectric constant of side walls and roof-floor is equal, attenuation of vertical polarization mode is markedly higher than that of horizontal polarization mode, and with the decreasing of the dielectric constant the attenuation rate of two mode is closing; When the transmitter is more close to the wall of the mine tunnel, the mode of propagation is more complex and the attenuation ratio is more serious, whereas in the middle of the mine tunnel, the attenuation rate of radio is the least. The solution above provides a theoretic basis to the wireless succor communication technique in mine tunnel.

关键词： Dielectric constant Electromagnetic propagation Attenuation Wireless sensor networks Radio transmitters Electromagnetic wave polarization Accidents Signal analysis Electromagnetic waveguides rectangular waveguides

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Effects and measurement of harmonics in high power waveguide systems

Effects and measurement of harmonics in high power waveguide...

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National Convention, IRE

作者： M. Forrer K. Tomiyasu General Electric Microwave Laboratory Palo Alto CA USA

A measuring technique is described that can be used to determine qualitatively and quantitatively all higher order modes propagating in a straight, lossless, rectangular waveguide. Calibrated electric probes are used to sample the electric field strengths at various locations on the waveguide walls. These locations are confined to specified transverse cross-sections. Results of measurements of second and third harmonic power generated by a high power, S-band radar transmitter are friefly discussed.

关键词： Power measurement Power system harmonics Loss measurement Propagation losses rectangular waveguides Probes Power generation Radar cross section Radar measurements Transmitters

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Modal computation of arbitrary waveguides composed of linear, circular and elliptical arcs

Modal computation of arbitrary waveguides composed of linear...

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Microwave, MTT-S International Symposium

作者： S. Cogollos S. Marini P. Soto H. Esteban J.V. Morro V.E. Boria B. Gimeno Grupo de Aplicaciones de las Microondas Departamento de Comunicaciones Universidad Politécnica de Valencia Valencia Spain Dpto. Fisica Aplicada-I.C.M.U.V. Universidad de Valencia Valencia Spain

In this paper, the very accurate and efficient modal analysis of arbitrarily shaped waveguides, whose cross-section is defined by a combination of straight, circular and/or elliptical arcs, is solved. An extension of the well-known boundary integral-resonant mode expansion (BI-RME) method is proposed. Successful comparisons with available numerical and experimental data fully demonstrates the validity of the improved BI-RME method proposed.

关键词： rectangular waveguides Modal analysis Resonator filters Waveguide components Transmission line matrix methods MONOS devices Waveguide discontinuities Dielectrics

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