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检索条件"主题词=Rectangular waveguides"

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A broadband integrated LTCC laminated waveguide to metallic waveguide transition

A broadband integrated LTCC laminated waveguide to metallic ...

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Microwave, MTT-S International Symposium

作者： Yong Huang Ke-Li Wu Department of Electronics Engineering Chinese University of Hong Kong Hong Kong China

ISBN: (纸本)0780376951

In this paper, a compact and broadband integrated transition between a laminated waveguide in a multi-layer Low Temperature Co-fired Ceramic (LTCC) substrate and a metallic rectangular waveguide (RWG) is presented. A Ka-band prototype of the proposed broadband transition is designed and fabricated in an LTCC substrate. The simulated and measured results of the prototype transition show excellent agreement. It has been demonstrated, through the experimental results of the Ka-band prototype, that the proposed transition configuration gives an effective bandwidth of over 8% with -15 dB return loss and average -0.4 dB insertion loss over the bandwidth in the Ka frequency band.

关键词： Waveguide transitions Waveguide components Millimeter wave technology Millimeter wave radar rectangular waveguides Prototypes Dielectric substrates Bandwidth Temperature Ceramics

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Fast and accurate CAD tool of passive rectangular waveguide devices including cylindrical conducting posts

Fast and accurate CAD tool of passive rectangular waveguide ...

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European Conference on Microwave

作者： F. Mira A.A. San Bias V.E. Boria B. Gimeno M. Bressan G. Conciauro Dpto. Comunicaciones Universidad Politécnica de Valencia Valencia Spain Dpto. Física Aplicada - ICMUV Universidad de Valencia Spain Dip. di Elettronica Università di Pavia ITALY

A fast and accurate computer-aided design (CAD) tool of passive devices in rectangular waveguide technology including cylindrical conducting posts is fully described. This tool is based on the boundary integral-resonant mode expansion (BI-RME) method and a multimode integral equation technique, thus resulting numerically efficient and therefore very appropriate for iterative optimization procedures. The advantages of the new CAD tool have been proved with the successful design of a tunable inductive filter, a dual-mode filter with tuning screws, and a very wide band mode-launcher with a 45/spl deg/ conducting post.

关键词： rectangular waveguides Design automation Band pass filters Fasteners Transmission line matrix methods Integral equations Wideband Iterative methods Optimization methods Passive filters

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A Dual Polarised Slotted Waveguide Antenna for Satellite Based Wind Scatterometer Instruments

A Dual Polarised Slotted Waveguide Antenna for Satellite Bas...

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European Conference on Antennas and Propagation

作者： Per Magnusson Manuela Di Salvo Claudio Scarchilli RUAG Space Sweden Gothenburg Sweden Thales Alenia Space Italia S.p.A. Rome Italy

ISBN: (纸本)9781467321877

This paper presents a concept for a dual polarised slotted waveguide antenna to be used for satellite based wind scatterometer antennas. The antenna is based on horizontally polarised slots waveguides in the narrow side of rectangular waveguides, standing next to ridge waveguides with vertically polarised slots. Instead of the usual arrangement with a coupling waveguide that distributes the RF power to the radiating waveguides, a barline network is used, providing significant advantages in terms of volume, mass, possible excitation coefficients and thermal stability.

关键词： Antennas space scatterometry slotted waveguide antennas dual polarisation array antenna MetOp ANTENNA Antenna arrays WAVEGUIDE ANTENNAS satellites SLOT Scatterometers SPACE Space ridge waveguides rectangular waveguides Waveguide Device Component

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Waves in irregular rectangular waveguide with inhomogeneous anisotropic impedance of wall

Waves in irregular rectangular waveguide with inhomogeneous ...

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International Kharkov Symposium on Physics and Engineering of Microwaves, Millimeter, and Submillimeter Waves

作者： V.F. Borulko Department of Radiophysics Dnipropetrovsk University Ukraine

In the present paper we theoretically consider coupling of transverse electric waves TE/sub n,0/ and TE/sub 0,m/, propagating in a rectangular waveguide formed by planes x=0,R and y=0,L. The wall with y=0 is supposed to have frequent and not deep corrugation and a thin magnetized ferrite film on it. Such a surface may be approximately described by small anisotropic surface impedance. Diagonal elements of impedance tensor w are caused by gyrotropy of transversally magnetized film and by a tilt of corrugation relative to longitudinal axis.

关键词： rectangular waveguides Tellurium Magnetic anisotropy Perpendicular magnetic anisotropy Ferrite films Corrugated surfaces Surface impedance Couplings Planar waveguides Waveguide theory

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A new rectangular waveguide to coplanar waveguide transition

A new rectangular waveguide to coplanar waveguide transition

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Microwave, MTT-S International Symposium

作者： G.E. Ponchak R.N. Simons NASA Lewis Research Center Cleveland OH USA Case Western Reserve University Cleveland OH USA

A novel rectangular-waveguide-to-coplanar-waveguide transition is described. The transition uses a ridge in one of the broad walls of the waveguide and a nonradiating slot in the opposite wall to split and rotate the electromagnetic fields of the rectangular waveguide TE/sub 10/ mode into the coplanar waveguide (CPW) fields. This transition should permit the use of CPW-based circuits in the millimeter-wave frequency range and the development of microwave probes above 50 GHz for fast and inexpensive testing of the millimeter-wave circuits.< >

关键词： Coplanar waveguides rectangular waveguides Waveguide transitions Electromagnetic waveguides Millimeter wave circuits Circuit testing Electromagnetic fields Tellurium Microwave circuits Frequency

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Slot antenna array on triangular waveguide

Slot antenna array on triangular waveguide

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Antennas and Propagation Society International Symposium

作者： Ying Chen Rodney G. Vaughan Sierra Wireless Laboratory Science Simon Fraser University Burnaby BC Canada

A new slot array antenna is presented which is based on triangular waveguide. The modes and the leakage of an imperfectly fabricated waveguide are examined by simulation, and this helps to identify a low cost structure. The slots are in the two side walls of the triangular waveguide. A 5-element, equally-excited antenna array is designed and simulated for 2.4GHz. The gain is 9.2 dBi and the -10dB impedance bandwidth is over 3%. The advantage of this array configuration is its simplicity, low cost and good performance.

关键词： Arrays Antenna arrays Slot antennas rectangular waveguides Impedance Surface waves

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Equivalent-Admittance Slot Representation in Periodic waveguides

Equivalent-Admittance Slot Representation in Periodic Wavegu...

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IEEE International Symposium on Antennas and Propagation

作者： J. Herranz-Herruzo A. Valero-Nogueira M. Baquero-Escudero R. Hernandez-Murcia iTeam Institute Universidad Politecnica de Valencia 46022-Valencia Spain

ISBN: (纸本)9781467304610

This paper describes a procedure to obtain the equivalent-admittance representation of a slot in a waveguide. The approach is general but it is particularly interesting for periodic waveguides because it does not require to know the waveguide's Green's function nor to properly define the ports in such waveguides. The procedure is demonstrated on a well-known rectangular waveguide.

关键词： Green's function methods Admittance rectangular waveguides Periodic structures Magnetic fields

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A wide band TEM horn array radiator with a novel microstrip feed

A wide band TEM horn array radiator with a novel microstrip ...

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IEEE International Conference on Phased Array Systems and Technology

作者： E.L. Holzman Telaxis Communications Corporation South Deerfield MA USA

We describe a TEM horn phased array radiator with a novel microstrip feed. Because the field profile in the TEM horn is uniform in amplitude and phase, multiple microstrip feeds can be inserted into a single radiator and their signals combined uniformly by the TEM horn; this particularly attractive feature makes possible low loss, wideband transmit power combining in the radiator rather than in the microwave module. Unlike Vivaldi notch and tapered slot antennas, the TEM horn radiator field configuration resembles that of a rectangular waveguide radiator and should have high cross-polarization rejection. Using a commercially available finite element analysis tool, we have designed in detail a dual-polarized array aperture operating from 1 to 5 GHz using this radiator. The element spacing supports full quadrant scan over the entire band of operation with a predicted scan VSWR less than 3:1 up to 52 degrees in elevation. Our simulation predicts better than 25 dB cross-polarisation rejection in the principal planes.

关键词： Wideband Microstrip antenna arrays Feeds Phased arrays Microstrip components Propagation losses Horn antennas Slot antennas rectangular waveguides Finite element methods

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A broadband CPW-to-waveguide transition using quasi-Yagi antenna

A broadband CPW-to-waveguide transition using quasi-Yagi ant...

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Microwave, MTT-S International Symposium

作者： N. Kaneda Y. Qian T. Itoh Electrical Engineering Department University of California Los Angeles CA USA

A novel CPW-to-waveguide transition utilizing a uniplanar quasi-Yagi antenna is presented. The X-band back-to-back transition demonstrates 33% bandwidth with return loss better than -10 dB. This transition should find... 详细信息

关键词： Broadband antennas Coplanar waveguides MMICs Circuits Antennas and propagation Reflector antennas Dipole antennas Bandwidth Waveguide transitions rectangular waveguides

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Square arrays of cylindrical dielectric resonator antennas

Square arrays of cylindrical dielectric resonator antennas

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Antennas and Propagation Society International Symposium

作者： H.Y. Lo K.W. Leung K.M. Luk E.K.N. Yung Department of Electronic Engineering City University of Hong Kong Kowloon Hong Kong China

The single-element DRA has been well studied but its antenna gain is limited to -5 dBi. In some applications a higher antenna gain may be required. Therefore, researchers have to design different types of DRA arrays to improve the antenna gain performance. Choosing an appropriate spacing between elements of the array, as well as proper phasing of the currents feeding individual sections, one may obtain various specialized radiation patterns with enhanced antenna gain. In this paper, an aperture-coupled single-element DRA is first studied and designed. Next, 2/spl times/2 and 4/spl times/4 arrays with all elements feeding in phase are designed. An infinite DRA phased array is investigated experimentally using a C-band rectangular waveguide termination.

关键词： Dielectric resonator antennas Antenna arrays Phased arrays Antenna radiation patterns Antenna measurements Radar antennas Resonant frequency rectangular waveguides Dielectric constant Loss measurement

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