Results 271 to 280 of about 3,838,312 (316)

Spurious modes suppression in Stacked Crystal Filter

2010 IEEE Long Island Systems, Applications and Technology Conference, 2010
Stacked Crystal Filters (SCFs) are used in Bandpass filters and other applications where frequency control is required. SCFs use the Solidly Mounted Resonator (SMR) structure to enable operations at RF frequencies, typically 1–5 GHz. In the response spectrum of the SCFs, besides the main resonance mode, there are some unwanted additional modes present ...
Ambarish Roy, Kanti Prasad, Bradley P. Barber   +2 more
openaire   +1 more source

Apodization Technique for Effective Spurious Mode Suppression of Aluminum Nitride Lamb Wave Resonators

IUS, 2018
This paper presents an apodization technique to suppress spurious modes in aluminum nitride (AlN) lamb wave resonators. The apodization pattern proposed is a 5-vertex irregular polygon shape.
Yao Zhu, Nan Wang, Geng LiChua, Bangtao Chen, M. Srinivas, Navab Singh, Y. Gu   +6 more
semanticscholar   +1 more source

The Maxwell’s System and Spurious Modes

2016
This chapter begins with the construction of different approximations of Maxwell’s equations by finite element methods and the comparison of their performance versus discontinuous Galekin methods. Then, we treat the important and not obvious problem of spurious modes which appear in most approximations and we indicate how to suppress these modes.
Gary Cohen, Sébastien Pernet
openaire   +1 more source

Spurious free D.L. TE mode band pass filter

1994 IEEE MTT-S International Microwave Symposium Digest (Cat. No.94CH3389-4), 2002
A direct coupled dielectric loaded bandpass filter is designed in a rectangular waveguide configuration using TE/sub 10/ mode with a spurious free response up to twice the operating frequency. The filter has no tuning screws and is small in size. Theoretical design of the filter is supported by the experimental results.
A. Abdelmonem, null Ji-Fuh Liang, null Hui-Wen Yao, K.A. Zaki   +3 more
openaire   +1 more source

Spurious modes caused by absorbing boundary conditions

IEEE Antennas and Propagation Society International Symposium. 1998 Digest. Antennas: Gateways to the Global Network. Held in conjunction with: USNC/URSI National Radio Science Meeting (Cat. No.98CH36194), 2002
Spurious modes can occur in the analysis of radiating structures, if absorbing boundary conditions (ABCs) are used. They can be put down to complex eigensolutions of the enclosed region, of which the wavenumbers are computed for ABCs of different order. The occurrence of spurious solutions is shown for a single microstrip line, analyzed with the method
openaire   +2 more sources

Spurious modes of electromagnetic vector potential finite elements

International Magnetics Conference, 1989
The mode spectra of individual electromagnetic vector potential finite elements are studied in detail. Theoretical spectra are deduced from the general properties of vector fields and the specific shape functions used in particular elements. Results are compared with spectra calculated using standard isoparametric tetrahedron and hexahedron elements ...
B.E. MacNeal, R.H. MacNeal, R.N. Coppolino   +2 more
openaire   +1 more source

The measurement of spurious modes in over-moded waveguides

Proceedings of the IEE - Part B: Electronic and Communication Engineering, 1959
A simple method is described for measuring the fraction of power in spurious modes generated by a transducer in the presence of the main mode. This method is applicable when the energy in the spurious mode is small and its guide wavelength is different from that of the main mode. Briefly it involves measuring the input standing-wave ratio as a function
openaire   +1 more source

Waveguide Bend Spurious Mode Program (Computer Program Descriptions)

IEEE Transactions on Microwave Theory and Techniques, 1977
To calculate the magnitude and phase of propagating modes in H-plane waveguide bends using annular modal analysis. This program can be used for the design of waveguide bends used in high powered multimode microwave systems where it is necessary to suppress spurious mode generation.
G. Govindarajan, E. Bahar
openaire   +1 more source

Effects of spurious modes in resonant cavities

Journal of Physics D: Applied Physics, 1993
General theory of two reactively coupled interacting resonant modes is presented in terms of normalized equivalent circuit parameters. For the first time analytical equations are derived that explain the effects on the mode frequencies, Q factors and couplings as a function of detuning for two coupled resonant modes.
openaire   +1 more source

Elimination of spurious modes in finite element analysis

Journal of Computational Physics, 1984
Causes of the spurious (non-physical) modes appearance are looked for when working with finite difference or finite element methods in eigenvalue problems. An analogy is drawn between electromagnetic wave propagation and acoustic wave propagation in liquids to show that the spurious modes encountered in both cases are due to fundamentally the same ...
Winkler, Joab R., Davies, J. Brian
openaire   +2 more sources