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Sep 22, 2014 - AP] 22 Sep 2014. Diffraction by a ... tour integral representations over so-called Sommerfeld- ... is that it offers a natural way to write down approximate solutions for ... mann problems; in particular, the wedge faces can under.
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A full high frequency asymptotic expansion for the scattering field in the ... wave with a normal surface impedance Zs, then the wave field satisfies a boundary condition for a ... we use the notation (z) for the real part of a complex number z. ...
problem by a strip described by FBC is formulated and solved using new method which ... properties of the fractional strip new features are observed. FBC has.
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due to the presence of near-surface residual stresses and tex- ture. FIG. 9. ... 12 A. O. Williams, Jr., ''The piston source at high frequencies,'' J. Acoust. Soc.
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Feb 15, 2016 - 1Department of Mechanics, Huazhong University of Science and Technology, Wuhan 430074, ... Volume 2016, Article ID 4015363, 12 pages ... popular nowadays, it is useful to have another method to ...... 182–189, 2010.
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Correction to" Plane Wave Diffraction by an Impedance Step
Diffraction by an Impedance Stepâ'. A. Biiyiikaksoy and F. Birbir. In solving the Wiener-Hopf equation (23a) appearing in the above paper,' two cases have been ...
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION, VOL. 44, NO. 3, MARCH 1996
422
tS Correction to “Plane Wave Diffraction by an Impedance Step”’ A. Biiyiikaksoy and F. Birbir
In solving the Wiener-Hopf equation (23a) appearing in the above paper,’ two cases have been considered seperately, according to the zero of the factor ( k / q 2 - a ) . However from ( l l b ) it is seen that this factor should not vanish. Hence, the correct solution of the Wiener-Hopf equation in (23a) should be as given in (26) only. Figs. 4(a), (b), and 5 are reproduced here by computing &?+(a) from (26). It is seen from the corrected Fig. 5 that the scattering effects of the step can be reduced if its impedance is capacitive. Furthermore, the printing errors in (23d) and (25b) should be corrected as follows: T=k
qz=0 4;>
2’
;
10 angle in degrees
(a)
/ :: I--
and
L
Fig. 4. Scattered field versus the observation angle 4 for different values of the half-plane impedances. (a) Half-plane impedances are capacitive, and (b) half-plane impedances are inductive.
The errors are regretted.
Manuscript received November 27, 1995. The authors are with the Istanbul Technical University, Electrical and Electronics Engineering Faculty, 80626 Istanbul, Turkey. Publisher Item Identifier S 0018-926X(96)01829-7. ‘A. Biiyiikaksoy and F. Birbir, IEEE Trans. Antennas Propagat., vol. 41, pp. 1160-1164, Aug. 1993.
0
30
60
90
120
150
180
angle in degrees
Fig. 5. Scattered field versus the observation angle q5 for different values of the step impedances.
