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检索条件"主题词=Rectangular waveguides"

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Asymptotic solution for bragg mode conversion in corrugated rectangular waveguide

Asymptotic solution for bragg mode conversion in corrugated ...

引用

International Seminar/Workshop on Direct and Inverse Problems of Electromagnetic and Acoustic Wave Theory (DIPED)

作者： V. F. Borulko Dept. of Physics Dnipropetrovsk National University Dnipropetrovsk Ukraine

rectangular waveguides with nonperiodical corrugation of wall are considered. The Krylov-Bogoliubov-Mitropolsky asymptotic method is used for solving boundary-value problem describing electromagnetic wave propagation in the close waveguiding structure. Mutual transformations of a wave modes propagating in such waveguides are investigated. Analytical solutions for some coupling coefficients are obtained.

关键词： rectangular waveguides Periodic structures Couplings Optical waveguides Chirp Corrugated surfaces

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Design of a simple structure OMT for millimeter wave applications

Design of a simple structure OMT for millimeter wave applica...

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IEEE International Symposium on Electromagnetic Compatibility (EMC-Beijing)

作者： Yanfei Li Jia Wang Kuikui Fan State Key Laboratory of Millimeter Waves Southeast University Nanjing China School of Information Engineering Communication University of China Beijing China

In this work we present a millimeter wave orthomode transducer (OMT) based on a simple structure. The OMT, with a square waveguide input (5.69 × 5.69 mm 2 ) and two single-mode waveguide outputs: a standard WR 22 waveguide (5.69×2.845 mm 2 ), has no iris, no pins and no coupling structure. From 34 to 40.5 GHz the measured transmission is ≈-2 dB, the reflection coefficient of each port is less than -10 dB, the cross polarization is less than -29 dB for both polarizations. Analysis in this article will bring some methods to improve the OMT performance based on our structure.

关键词： Transducers Ports (Computers) rectangular waveguides Reflection Frequency measurement Waveguide junctions Finline

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Ridge Waveguide Divider Junctions for Wide-Band Multiplexer Applications

Ridge Waveguide Divider Junctions for Wide-Band Multiplexer ...

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Microwave, MTT-S International Symposium

作者： Yunchi Zhang Jorge A. Ruiz-cruz Kawthar A. Zaki Department of Electrical and Computer Engineering University of Maryland College Park MD USA

Ridge waveguide divider junctions are introduced and applied to wide-band multiplexer applications. A rigorous analysis and optimization process by mode matching method (MMM) is employed to design the junctions that yield low reflection coefficient in common port and almost equal transmission coefficients in the other two ports over a wide frequency band. Two design examples of wide-band diplexer and triplexer using such junctions are presented. All the components involved in the diplexer/triplexer designs are rigorously modeled and cascaded by MMM. Optimization procedures by MMM are also applied in these two designs to improve the performance. Multiplexers using such junctions can be built in either metallic form or low-temperature co-fired ceramic (LTCC) technology

关键词： Waveguide junctions Wideband Multiplexing Frequency rectangular waveguides Design optimization Mode matching methods Application software Reflection Millimeter wave technology

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Elimination of fine tuning in high power, low-PIM diplexers for combined transmit/receive antennas

Elimination of fine tuning in high power, low-PIM diplexers ...

引用

IEE Colloquium on Microwave Filters and Multiplexers

作者： G.G. Connor British Aerospace (Space Systems) Limited UK

The use of combined transmit/receive antennas on spacecraft can reduce the mass by a considerable amount. Such a configuration normally requires the diplexing of the receive and transmit bands onto a common feed. Due to the difference in power levels, problems can arise if passive intermodulation (PIM) products from the transmit carriers fall within the receive band at power levels of the same order as the receive carriers. The design and performance of a low-PIM diplexer is described. It is shown that a transmission line model may be used for the precise design of rectangular waveguide manifold diplexers which maintain the Chebyshev transfer function properties of the low-pass prototype. The use of mode matching in the final stages of realisation allows the unit to be constructed in two halves and the performance maintained without the need for tuning screws. By reducing the number of metal to metal contacts lower PIM levels can be achieved. It is shown that for two 100 W carriers input to the transmit port, the 3rd Order APIM level is lower than -140 dBm, i.e. -190 dBC, over a temperature range of -40 deg C to +120 deg C. The variation of PIM level with both power and PIM order is presented.< >

关键词： Transmitting antennas Intermodulation distortion Microwave antennas Multiplexing Receiving antennas rectangular waveguides Waveguide couplers

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A Simple Broadband Transition from Waveguide to Microstrip Line in X Band

A Simple Broadband Transition from Waveguide to Microstrip L...

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International Conference on Wireless Communications, Networking and Mobile Computing (WiCom)

作者： G. Niyomjan B. Cheeseman Y. Huang Department of Electrical Engineering and Electronics University of Liverpool Liverpool UK

A simple broadband transition from waveguide to microstrip using the short transformer technique is proposed and investigated in this paper. A layer of dielectric substrate is employed as a matching structure between the waveguide and microstrip line structure, which is optimised using the direct search method. It is shown that the transition has an average return loss value of -19.2 dB throughout the X band (8-12 GHz) with the best return loss value of -64 dB

关键词： Waveguide transitions rectangular waveguides Dielectric substrates Radar antennas Microstrip antennas Planar waveguides Permittivity Frequency Airborne radar MMICs

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Gap waveguides and PMC packaging: Octave bandwidth mm- and submm-wave applications of soft & hard surfaces, EBGs and AMCs

Gap waveguides and PMC packaging: Octave bandwidth mm- and s...

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Asia-Pacific Conference on Microwave

作者： Per-Simon Kildal Department of Signals and Systems Chalmers University of Technology Gothenburg Sweden

AMCs, EBGs and other surface-based metamaterials are known to have narrow bandwidths. However, when they are used to generate stopbands for parallel-plate modes, the bandwidth can be very large. This characteristic is used in the gap waveguide technology that was invented in 2008, based on old research on soft and hard surfaces. The gap waveguide technology can be used to package microstrip and CPW circuits, but can also with advantage replace such standard technologies and in particular above 30 GHz. The gap waveguides can have similar lowloss performance as solid rectangular waveguides, but they can be realized in a much better way. rectangular waveguides are normally realized by split blocks which are screwed tightly together to ensure good conductive contact, whereas gap waveguides can be realized between parallel plates without metal connection. This paper overviews how the gap waveguide technology has been explored during the passed five years including: demonstrations of the wideband lowloss guiding characteristics up to 260 GHz, demonstrations of packaging in different frequency ranges with different AMCs or EBGs, and demonstrations of filters, transitions, MMIC packaging, corporate distribution networks, and slot and horn array antennas. The technology demonstrators cover the three different versions of gap waveguides: groove gap waveguide, ridge gap waveguides and microstrip gap waveguides.

关键词： Waveguide discontinuities Surface waves Microstrip Packaging Microwave filters rectangular waveguides

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The miniaturization of rectangular waveguide

The miniaturization of rectangular waveguide

引用

International Conference on Microwave and Millimeter Wave Technology Proceedings

作者： Zhiyuan Yu Institute of Applied Physics University of Electronic Science and Technology Chengdu China

This paper presented a miniaturization rectangular waveguide which much smaller than hallow rectangular waveguide (HRWG) having same cutoff frequency of dominant mode and a large bandwidth of single dominant mode working (BWSMW) by inserting a suspended dielectric layer which partly covered a metal grounded plane. The numerical simulating shows that the cutoff frequency of dominant mode descended, while the first high order mode's cutoff frequency changed slowly when the relative permittivity of the dielectric layer increases. The transverse section sizes of the presented waveguide is less than half of the HRWG with same cutoff frequency of dominant mode and much larger BWSMW which is 1.9 times of the ones of HRWG is observed in the studied case.

关键词： rectangular waveguides Electromagnetic waveguides Cutoff frequency Planar waveguides Waveguide components Bandwidth Dielectric substrates Permittivity Ultra wideband technology Numerical simulation

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A new temperature compensation method of rectangular waveguide resonant cavities

A new temperature compensation method of rectangular wavegui...

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Asia-Pacific Conference on Microwave

作者： Yidong Wang Qiang Sui Beijing-Lund Broadcasting Technology Laboratory of the Communication University of China Beijing China

Effect on rectangular waveguide resonant cavity of temperature is discussed. A new temperature compensation method is proposed. Bimetal is used to adjust resonant frequency. An instrument is produced under the instruc... 详细信息

关键词： rectangular waveguides Resonance Resonant frequency Conducting materials Temperature sensors Instruments Silver Dielectrics Shape memory alloys Fasteners

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A 12 GHz-band planar waveguide array antenna for compact range application

A 12 GHz-band planar waveguide array antenna for compact ran...

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Antennas and Propagation Society International Symposium

作者： K. Miyata Electrical Engineering Department Akita National College of Technology Akita Japan

For the purpose of realizing compact plane-wave antenna measurements, a planar array antenna made of 45 rectangular waveguides is fabricated for small antenna pattern measurements. The center frequency designed for the antenna is 12 GHz. As a result of the horn antenna pattern measurement, fairly good agreement between the outdoor data and that in the fabricated situation is obtained. This newly constructed array antenna is expected to offer low-cost weather-independent antenna measurements.< >

关键词： Planar waveguides Antenna arrays Antenna measurements Slot antennas Planar arrays Horn antennas rectangular waveguides Power dividers Attenuators Loaded antennas

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A Novel Theoretical Approach of Fishnet-type Material Composed of Multilayer Metallic Patterns by the Equivalent Circuit

A Novel Theoretical Approach of Fishnet-type Material Compos...

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URSI Commission B International Symposium on Electromagnetic Theory

作者： Tsunayuki Yamamoto Hiroshi Kubo Atsushi Sanada Graduate School of Science and Engineering Yamaguchi University

ISBN: (纸本)9781467349390

In this paper, an equivalent circuit of a fishnet-type material composed of multilayer metallic patterns is proposed. The fishnet-type material can be considered as a rectangular waveguide with stubs, and the operation principles can be simply and clearly explained by a proposed equivalent circuit. Proposed equivalent circuit can be useful for analyzing and designing of fishnet-type material.

关键词： equivalent circuits type material rectangular waveguides multilayers stub

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