Results 261 to 270 of about 3,838,312 (316)

Spurious modes in finite-element methods

IEEE Antennas and Propagation Magazine, 1995
This paper describes the problem of spurious modes that appear with finite-element solutions of the vector wave equation. It explains that this problem is caused by inconsistent approximations of the static solutions to the wave equation. Tangential-vector finite elements are described that enforce the tangential continuity of the vector field, but ...
null Din Sun, J. Manges, null Xingchao Yuan, Z. Cendes   +3 more
openaire   +1 more source

Spurious-mode suppression in optoelectronic oscillators

2010 IEEE International Frequency Control Symposium, 2010
Optoelectronic oscillators (OEOs) are promising low phase noise radio frequency sources. However, the long fiber loops required for a high Oscillator Q also lead to spurious modes (spurs) spaced too narrowly to be filtered by standard electronic devices.
Olukayode Okusaga, Eric Adles, Weimin Zhou, Curtis Menyuk, Gary Carter, Etgar Levy, Moshe Horowitz   +6 more
openaire   +1 more source

Spurious results of the component mode synthesis

Computers & Structures, 1973
Abstract The natural frequencies and mode shapes of a bentbeam in flexure-torsion oscillation are examined using the modal synthesis technique. The problem involves six boundary constraint conditions and the effect of ignoring a number of these conditions are examined. The choice of generalized coordinates offer other variations in the problem.
William T. Thomson, Leandro Fernandez-Sainz   +1 more
openaire   +1 more source

Identification of Spurious Modes in Circulators (Correspondence)

IEEE Transactions on Microwave Theory and Techniques, 1971
The spurious, and sometimes troublesome spikes in circulator characteristics are shown by analysis and experiment to be due to hybrid resonant modes of the ferrite post open-resonator structure. They can be excited by axial nonuniformities such as imperfect contact between the ferrite and the conducting walls, but they cannot exist in axially uniform ...
J.B. Castillo, L.E. Davis
openaire   +1 more source

An Effective Approach to Suppressing the Spurious Mode in Rectangular Waveguide Filters

IEEE Microwave and Wireless Components Letters, 2019
In this letter, a new method for rectangular waveguides bandpass filters with improved stopband performance is presented. By setting the position of the coupling window, the coupling of the high-order mode can be attenuated, which makes it difficult to ...
Qiuyi Wu, F. Zhu, Yimin Yang, X.-W. Shi
semanticscholar   +1 more source

Spurious Mode Suppression in Coupled Resonator Filters

IEEE MTT-S International Microwave Symposium Digest, 2005., 2005
The Coupled Resonator Filter (CRF) is a new type of Bulk-Acoustic-Wave (BAW) device in which two piezoresonators are stacked on top of each other in a way that a certain degree of acoustic interaction occurs. For a proper frequency response, a method for suppression of spurious resonances is of utmost importance.
G. G. Fattinger, M. R. Fattinger, K. Diefenbeck, P. Müller, R. Aigner   +4 more
openaire   +1 more source

Investigation of spurious mode suppression in 3.8 GHz shear-horizontal mode surface acoustic wave resonators based on LiNbO3/SiO2/Si multilayer structure

Journal of Micromechanics and Microengineering
LiNbO3(LN)/SiO2/Si multilayer structures have recently attracted much attention due to their superior performance in realizing wideband radio-frequency acoustic filters.
Cheng Tu, Ting Zhang, Zhuoyuan Zhang, Q. Huang, Xiao-sheng Zhang   +4 more
semanticscholar   +1 more source

Over 10% of ${k}_{\text{eff}}^{{2}}$ Demonstrated by 2-GHz Spurious Mode-Free Sc0.12Al0.88N Laterally Coupled Alternating Thickness Mode Resonators

IEEE Electron Device Letters, 2019
In this letter, a group of laterally coupled alternating thickness (LCAT) mode resonators based on 12% scandium-doped aluminum nitride (Sc0.12Al0.88N) are reported. The LCAT mode resonators are realized in-house by sandwiching a layer of 1- $ {\mu }\text{
Nan Wang, Yao Zhu, G. Chua, Bangtao Chen, S. Merugu, Navab Singh, Y. Gu   +6 more
semanticscholar   +1 more source

The effect of busbar structure on Q factor enhancement and spurious mode suppression in Lamb wave resonators

Applied Physics Letters
Lamb wave resonators (LWRs) exhibiting high-quality factors and clean spectra demonstrate promising applications in RF communication and sensing. This paper discusses the relationship between the spurious mode, the quality factor, and the effective ...
Qinwen Xu, Yang Zou, Chao Gao, Xiang Chen, Jie Zhou, Xin Tong, Yan Liu, Shishang Guo, Yao Cai, Chengliang Sun   +9 more
semanticscholar   +1 more source

Implementation and application of a 9-node Lagrange shell element with spurious mode control

Computers and Structures, 1985
T. Belytschko, Liu Wing-Kam, J. Ong, D. Lam   +3 more
semanticscholar   +3 more sources