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检索条件"主题词=Rectangular waveguides"

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Broadband probe for efficient near field measurements

Broadband probe for efficient near field measurements

引用

Antennas and Propagation Society International Symposium

作者： Jung-Ick Moon J.M. Kim J.H. Yun S.I. Jeon C.J. Kim Electronics and Telecommunications Research Institute South Korea

ISBN: (纸本)9781424408771;1424408776

In this paper, we designed and fabricated the broadband probe with double ridged waveguide for broadband near-field measurements. An exponential taper ridge in the rectangular waveguide and novel waveguide transition were implemented for wideband impedance matching and compression of the higher modes. It has wideband characteristics and its measured impedance bandwidth ratio is approximately 123%(4.17:1) from 12.0 GHz to 50 GHz for SWR<3.0. And the peak radiation gain is 5.7~14.3 dBi. The performance of this probe is verified by the measured results and is in good agreement with the simulated results. It is possible that our designed broadband probe is applied to broadband near-field measurement under 50 GHz.

关键词： Probes Antenna measurements Broadband antennas Performance evaluation Impedance Bandwidth Millimeter wave measurements rectangular waveguides Frequency measurement Moon

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On the transformation of modal bases in rectangular waveguide

On the transformation of modal bases in rectangular waveguid...

引用

European Conference on Microwave

作者： A. Morini T. Rozzi L. Zappelli A. Angeloni Dipartimento di Elettronica ed Automatica Università di Ancona Ancona Italy

The excitation of hybrid modes by discontinuities in rectangular waveguide can often be decomposed into separate LSE/LSM or TE/TM mechanisms, so that each component can be analysed with the most suitable modal base. Correct interfacing, however, is required. We report the scattering matrices representing all the possible transformations of modal bases in rectangular waveguide. Such matrices provide an useful tool to simulate complex circuits made up of components strongly interacting, without requiring the use of a common modal base for the characterization of each element. Since the transformation matrices can easily include pieces of transmission lines, their use does not require any additional computation effort.

关键词： rectangular waveguides Transmission line matrix methods Matrix decomposition Waveguide components Waveguide discontinuities Tellurium Scattering Computational modeling Circuit simulation Distributed parameter circuits

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Wide-band antenna array

Wide-band antenna array

引用

European Radar Conference (EURAD)

作者： R. Chernobrovkin I. Ivanchenko A. Korolev L.P. Ligthart N. Popenko V. Pazynin Usikov Institute of Radiophysics and Electronics of National Academy of Sciences of Ukraine Kharkiv Ukraine Institute of Radio Astronomy National Academy of Sciences of Ukraine Kharkiv Ukraine Faculty of Electrical Engineering Mathematics and Computer Science International Research Centre for Telecommunications and Radar Delft University of Technnology Delft Netherlands

In this paper the open-ended dielectrically filled waveguide as the original individual radiator of the wideband antenna array with the beam steering plusmn50 0 is presented. Both the electric and magnetic dipoles are analyzed as the candidates of the aforementioned waveguide exciter. The characteristics of the optimized individual radiator included in the antenna array consisting of sixteen elements are analyzed. This antenna array guarantees beam steering plusmn50 0 and the side lobes level less than -10 dB. The experimental radiation patterns and S 11 parameters are discussed.

关键词： Broadband antennas Antenna arrays Dielectrics Dipole antennas Radar antennas Permittivity Bandwidth Arrayed waveguide gratings rectangular waveguides Beam steering

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Corrugated Horns - Recent Developments

Corrugated Horns - Recent Developments

引用

European Conference on Microwave

作者： T.B. Vu Q.H. Vu School of Electrical Engineering University of New South Wales Kensington NSW Australia

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Millimetre Wave Finline Balanced Mixers

Millimetre Wave Finline Balanced Mixers

引用

European Conference on Microwave

作者： R.N. Bates M.D. Coleman Philips Research Laboratories Redhill Surrey UK Philips Research Laboratories Redhill Surrey U.K.

This paper describes the design and performance of balanced mixers for use in the frequency ranges 27 to 40 GHz and 60 to 90 GHz. The transmission medium used is integrated finline which is potentially cheap to produce and has lower loss than microstrip while remaining compatible with beam lead diodes. The performance obtained is comparable with that obtained using conventional techniques but the low cost circuit technology is suitable for mass production.

关键词： Finline Circuits rectangular waveguides Coplanar waveguides Microstrip Dielectric substrates Frequency Local oscillators Diodes Waveguide transitions

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Signal Integrity Modeling in Inhomogeneous Waveguide/PCB of Arbitrary Shape Using Broadband Green's Function

Signal Integrity Modeling in Inhomogeneous Waveguide/PCB of ...

引用

IEEE Electronic Components and Technology Conference

作者： Kung-Hau Ding Tien-Hao Liao Leung Tsang Sensors Directorate Air Force Research Laboratory OH Jet Propulsion Laboratory California Institute of Technology Pasadena CA University of Michigan Ann Arbor MI

In this paper, using the Broadband Green's function with low wavenumber extraction (BBGFL) method, we develop the broadband Green's function for an arbitrary-shaped waveguide with two different dielectrics inside. We use the modes of an arbitrary-shaped waveguide to compute the broadband response of an arbitrary-shaped waveguide using the BBGFL method. In addition, we further apply the higher order low wavenumber extraction technique to accelerate the convergence of modal summations. The accuracy of BBGFL results are verified by comparing with results from the Method of Moment (MoM) and HFSS.

关键词： Green's function methods Broadband communication Method of moments Nonhomogeneous media Dielectrics rectangular waveguides

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Void and Pore Detections by the Scanning Near-Field Millimeter-Wave Microscopic Aperture Probe

Void and Pore Detections by the Scanning Near-Field Millimet...

引用

Asia-Pacific Conference on Microwave

作者： S. Theerawisitpong T. Suzuki T. Negishi K. Shibahara Y. Watanabe Department of Electrical and Electronic Engineering Nippon Institute of Technology Saitama Japan

To verify the defect on the material may be required for industrial application, such as void and pore detections. In our research, the scanning near-field millimeter-wave microscopy is used to detect the void and pore. In experiment, the voids are formed inside the Teflon sample with various in-depths from 0.5 mm to 10 mm. Each void is 1 mm-dia and 20 mm-length. The air void and water-filled void are recognized at in- depth of 2 mm. Another, the pores are on the surface of the TiO 2 sheet with thickness of 2.4 mm. The 0.8 mm-depth pore is clearly recognized. The in-depth capability of void and pore detections has been proposed.

关键词： Microscopy Apertures Probes Millimeter wave technology Millimeter wave measurements Ceramics Image resolution rectangular waveguides Optical imaging Frequency

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140-GHz Low-Loss Wideband Air-Filled Waveguide Transition Integrated in LTCC and The Antenna Application

140-GHz Low-Loss Wideband Air-Filled Waveguide Transition In...

引用

International Conference on Infrared and Millimeter Waves

作者： Peng Wu Yan Zhao Xiao Liu Yuxin Ren Chengxiang Hao Zhongjun Yu Aerospace Information Research Institute Chinese Academy of Sciences Beijing China GBA Branch of Aerospace Information Research Institute Chinese Academy of Sciences Guangzhou China

Air-filled waveguide integrated in Low Temperature Co-fired Ceramic (LTCC) has advantages of low loss and high efficiency compared with the SIW using dielectric substrate-filled waveguide and is suitable for the design of sub-millimeter wave and terahertz circuits and components. In this paper, a 140 GHz low-loss integrated air-filled waveguide is designed in LTCC, and to feed the integrated air-filled waveguide, a wideband transition from metal rectangular waveguide to LTCC air-filled waveguide is presented using a stage impedance matching structure based on the LTCC manufacture process technology. Moreover, a horn antenna integrated in LTCC is designed at 140-GHz band and fed by the low-loss integrated air-filled waveguide. To obtain higher gain, a dielectric loaded SIW stage horn antenna is designed. The transition and antenna show good performance and demonstrate the application potential over the sub-millimeter wave and terahertz frequencies of integrated air-filled waveguide in LTCC.

关键词： Waveguide transitions Waveguide components Horn antennas Impedance matching rectangular waveguides Metals Broadband antennas

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Novel Offset Complementary Split Ring Resonators on Narrow-wall of waveguides for HPM Applications

Novel Offset Complementary Split Ring Resonators on Narrow-w...

引用

IEEE International Symposium on Antennas and Propagation

作者： Mohammad Saif ur Rehman Liu Meiqin Chunliang Liu Edl Schamiloglu Key Laboratory of Physical Electronics and Devices of the Ministry of Education Xi'an Jiaotong University Xi'an Shaanxi China School of Electronic and Information Engineering Xi'an Jiaotong University Xi'an Shaanxi China University of New Mexico Albuquerque NM USA

ISBN: (纸本)9781728146713

A novel offset Metamaterial-based complementary split-ring resonator (CSRR) and its characteristic behavior on the narrow wall of a rectangular waveguide is considered, for the advancement and implementation of high-power microwave (HPM) antennas, operable at L-Band along with other potential frequencies. The architecture improves the properties of traditional slots and split ring resonators (SRRs) mounted on the narrow wall of selected waveguides (radius= 24mm, thickness=3.5mm, chord=0.8., offset=2.7mm)., with their designated frequency regimes. The inter-spacing and offset tuning of the array elements have core effects on mechanical strength, coupling, phase, radiation efficiency, as well negative index properties. The design supports high tunability for adaptation on other architectures, as well as decent phase consistency with THz prospects.

关键词： Microwave antennas Couplings Phased arrays Split ring resonators Resonant frequency rectangular waveguides Microwave antenna arrays

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EMI analysis of multiple diaphragms in rectangular waveguide for switching applications

EMI analysis of multiple diaphragms in rectangular waveguide...

引用

International Conference on Electromagnetic Interference and Compatibility

作者： A. Bhattacharya Electronics & Instrumentation Department Indian School of Mines University Dhanbad Jharkhand India

ISBN: (纸本)9781424452033

The transmission and reflection performance of multiple thick diaphragms inside a rectangular waveguide is vastly different from a single diaphragm of comparable size due to the conducted EMI between the diaphragms. The characterisation of such a structure is carried out by full wave analysis with the help of method of moments. It is shown that diaphragms separated longitudinally by dielectric material can behave as a RF switch. The theoretical finding is compared with experimental measurements. Means of shifting the switching frequency of the switch is also indicated.

关键词： Electromagnetic interference rectangular waveguides Switches Radio frequency Semiconductor diodes Impedance Moment methods Dielectric materials Dielectric measurements Narrowband

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