Mode-matching analysis of TE/sub 011/-mode waveguide bandpass filters

Melloni, Andrea; Politi, M.; Gentili, Gian Guido

doi:10.1109/22.414547

Cited by 10 publications

(7 citation statements)

References 16 publications

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“…is block-diagonal and takes on the form (2) where the superscript indicates the submatrix relative to ports 3-3b and superscript that relative to ports 4-4b in Fig. 1.…”

Section: B Gam Of the Transition Regionmentioning

confidence: 99%

“…In the literature, such a junction has been analyzed with the "small curvature" approximation [1]- [3], i.e., neglecting the curvature effect at the junction (see Fig. 1) and with a TEfield expansion [2], [3]. That approach was convenient since the purpose of those works was to develop a software tool for an efficient analysis TE -mode cylindrical cavity filters.…”

Section: Introductionmentioning

confidence: 99%

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Analysis of the X-junction between two rectangular waveguides and a circular waveguide

Gentili¹,

Melloni

1997

IEEE Microw. Guid. Wave Lett.

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The paper describes a method for the analysis of the four-port junction (X-junction) between two rectangular waveguides and a circular waveguide. The method is based on the computation by an efficient technique of the generalized admittance matrix (GAM) of the structure (conveniently divided into subblocks) with no restrictions on the geometrical dimensions. a typical analysis with about 100 modes in the overall structures requires 1-4 s per frequency point on a typical medium-power workstation.

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“…is block-diagonal and takes on the form (2) where the superscript indicates the submatrix relative to ports 3-3b and superscript that relative to ports 4-4b in Fig. 1.…”

Section: B Gam Of the Transition Regionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Analysis of the X-junction between two rectangular waveguides and a circular waveguide

Gentili¹,

Melloni

1997

IEEE Microw. Guid. Wave Lett.

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“…Recently, the side-coupled configuration has increasingly received attention [7][8][9][10] due to its significant reduction in the filter footprint. To our best knowledge, all the reported side-coupled circular waveguide filters use rectangular apertures for the input and output ports.…”

Section: Introductionmentioning

confidence: 99%

A new probe‐excited dual‐mode cavity filter

Leng

Shen

Khong

2003

Micro & Optical Tech Letters

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the proposed formulation we have analyzed several waveguiding structures. The results obtained-which include propagating, evanescent, and complex modes-are in good agreement with those obtained by HFSS. REFERENCES1. M.N.O. Sadiku, Numerical techniques in electromagnetics, 2nd ed., CRC Press, Boca Raton, FL, 2001. 2. A. Taflove and S. Hagness, Computational electrodynamics: The finitedifference time-domain method, 2nd ed., Artech-House, Boston, 2000. 3. M.-L. Lui and Z. Chen, A direct computation of propagation constant using compact 2-D full-wave eigen-based finite-difference frequencydomain technique, Proc Int Comput Electromagn Conf, Beijing, 1999, pp. 78 -81. A compact 2-D full-wave finite-difference frequency-domain method for general guided wave structures, IEEE Trans Microwave Theory Techn MTT-50 (2002), ABSTRACT: This paper presents a novel configuration for dual-mode cylindrical cavity filters operating in the TE 111 mode. The proposed configuration is compact yet simple, with only one coupling probe to excite two orthogonal TE 111 modes in a cylindrical waveguide cavity. A prototype is designed to operate at 10 GHz. Simulated and experimental results are provided. ABSTRACT: A novel four-branch single-mode wide-angle power divider, consisting of a symmetric Y-branch waveguide with a phase front retarder around the junction and a central V-shaped two-branch waveguide located a coupling gap apart, is proposed. Low loss, large angle, and uniform output power distribution can be achieved by adjusting the gap between Y-branch and V-shaped two-branch waveguides.Moreover, the proposed power divider can be used in wide-bandwidth wavelength-division-multiplexing (WDM) systems. Also, the effect on the power-dividing ratio is insensitive to fabrication tolerance.

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“…that includes the propagation constants, which are frequency-dependent, when otherwise the surface integrals are only dependent on the dimensions; this impacts the computation speed. For relatively large apertures the numerical integrals are necessary, but a small-angle approximation can be used when the aperture width is much smaller than the cavity circumference [59,60].…”

Section: Aperture Approximationmentioning

confidence: 99%

“…In order to include possible radiation effects at the end of the hole containing the tube, the structure is modeled as a four-port junction, after Zheng [59]. Other mode-matching analyses of a sidewall aperture-coupled cavity have been done by Melloni and Rong, although the cavities in both of these papers were closed except for the aperture [58,60]. In Kawabata's work of an eigenfrequency analysis of a concentric liquid-tube configuration in a TM 010 cavity, the ends of the hole were shorted with both electric and magnetic walls, and the hole length in the modeling was increased until the resonant frequency for both types of walls matched [44].…”

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Cavity Resonator for Permittivity Measurements of Liquids at Millimeter-wave Frequencies

Sklavounos

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Permittivity data of liquids is necessary for applications such as dielectric heating, remote sensing, and moisture detection, and is also used for molecular characterization. Dispersive molecular mechanisms occur for field excitations of frequencies mainly above 10 GHz and extending into terahertz and optical frequencies. Around 100 GHz there is less data, due to the frequency limits of microwave and quasi-optical techniques. This work presents an over-moded cavity resonator for liquid permittivity measurements. Novel full-wave modeling of a four-port inhomogeneous waveguide junction removes the limits imposed by previous methods. A cavity with environmental control was designed and tested. The parameters estimated from the modeling and measurement inputs are plausible and comparable to literature. Based on repeatability measurements and a sensitivity analysis, recommendations are made for future cavity designs that will enable permittivity measurements at frequencies previously little measured. i I would foremost like to thank Dr. Scott Barker for his guidance, encouragement, and patience, particularly while I wrestled with the modeling. His observations and advice always helped to keep me afloat. I would also like to thank Dr. Robert Weikle III for providing helpful consultations with the modeling, along with Dr. Brooks Pate, Dr. Tatiana Globus, and Dr. Avik Ghosh for serving on my committee and for their helpful knowledge with regards to spectroscopy and liquid measurement. I also want to thank all of the former and present members of MiRFTech and the FIR lab for all of their thoughtful instruction and advice, as well as crucial camaraderie. In particular, Dr. Lihan Chen was always willing to answer my random questions, Matthew Bauwens was of great help with the block design, and Dr. Alex Arsenovic was influential with the Python programming. Thanks must also go the staff of the ECE department for their aid and friendliness. Much gratitude to my friends Alex, Robert, Nii, and Vishal for fun trips and non sequitur e-mails, all of which never failed to amuse and recharge me. And last but not least, the deepest appreciation to my parents for their eternal love and support. I dedicate this work to them.

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Mode-matching analysis of TE/sub 011/-mode waveguide bandpass filters

Cited by 10 publications

References 16 publications

Analysis of the X-junction between two rectangular waveguides and a circular waveguide

Analysis of the X-junction between two rectangular waveguides and a circular waveguide

A new probe‐excited dual‐mode cavity filter

Cavity Resonator for Permittivity Measurements of Liquids at Millimeter-wave Frequencies

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