A reliable simple method to extract the intrinsic material properties in millimeter/sub-millimeter wave domain

Although thermally induced tensile residual stresses have been known to occur in ground components, it has not been possible to predict the critical temperature at which these stresses begin to manifest themselves in the workpiece. In this paper, a model of the formation of thermally induced tensile residual stresses is proposed and a simple method of calculating the critical temperature above which tensile residual stresses occur is developed. The analysis makes use of dimensional methods to characterize the critical temperature. In addition, a formula characterizing the yield strength as a function of temperature was developed. The model was then validated using finite element techniques and some experimental data. The analysis reveals that it is possible to determine the critical temperature above which tensile residual stresses will be manifested based on readily available material properties. A case study illustrates the application of the technique.

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A Simple Method for Millimeter-Wave Finline Balanced Mixer Design Using Three-Dimensional Field Simulation Software

Journal of Infrared Millimeter and Terahertz Waves ◽

10.1007/s10762-011-9843-0 ◽

2011 ◽

Vol 33 (1) ◽

pp. 25-35 ◽

Cited By ~ 3

Author(s):

Wei Zhao ◽

Yong Zhang ◽

Mingzhou Zhan ◽

Yongbo Chen ◽

Ruimin Xu

Keyword(s):

Millimeter Wave ◽

Three Dimensional ◽

Simulation Software ◽

Simple Method ◽

Field Simulation ◽

Mixer Design ◽

Balanced Mixer

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The Millimeter Wave Spectrum of DCNO: An Example of Current Measurements in the Frequency Range from 60 to 350 GHz

Zeitschrift für Naturforschung A ◽

10.1515/zna-1974-0414 ◽

1974 ◽

Vol 29 (4) ◽

pp. 633-641 ◽

Cited By ~ 7

Author(s):

Manfred Winnewisser ◽

Brenda P. Winnewisser

Keyword(s):

Excited State ◽

Millimeter Wave ◽

Ground State ◽

Preliminary Data ◽

Wave Spectrum ◽

Frequency Range ◽

Simple Method ◽

Efficient System ◽

First Excited State ◽

Bending Modes

An efficient system for preliminary data reduction is described which completes a recently developed data acquisition and reduction system for the measurement of millimeter wave absorption lines with the help of a dedicated computer. A simple method of automatically determining the absorption line centers is given. Rotational transitions of DCNO, measured with the above system, are reported for the ground state and the first excited state of each of the two bending modes ν4 and ν5. The rotational and rotation-vibration constants obtained for these states are B0 = 10,292.48340 (31) MHz, D0 = 3.5418 (10) kHz,Bν4 = 10,306.00780 (45) MHz, Dν4 = 3.6409 (22) kHz,Bν5 = 10,338.65942 (32) MHz, Dν5 = 3.6208 (16) kHz.The l-type doubling constants q.t0) and qt(1) agree with the values obtained previously from direct l-type doubling transitions.

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