So, hier nochmal die Quellen aufgeführt:
REFERENCES FOR FORMULAS USED IN PROGRAM MWI
Stripline Zo calculation is based on S. B. Cohn, IEEE Trans MTT,
Mar 1955 & Jul 1954 with narrow line case from J. F. White,
Semiconductor Control, Artech House, 1977, pp 521-2. Single open end
fringing length extension is from IPC 2.5.5.5 [3] based on
H.M.Altschuler & A.A.Oliner, IRE Trans MTT-8, May 1960,p 328.
Formulas for broadside stripline coupler are in S. B. Cohn, IRE
trans. MTT, Vol MTT-8, Nov 1960, p 633-.
Formulas for edge coupled stripline are in S. B. Cohn, IRE Trans. MTT,
Oct 1955, pp29-38, and with error in G. L. Matthaei, L. Young and E. M.
T. Jones, Microwave Filters, Impedance- Matching Networks and Coupling
Structures, 1980, pp 174 on. Differential and common mode impedances
are according to (7) in D. A. Smolyansky and S. D. Corey,
Characterization of Differential Interconnects from Time Domain
Reflectometry Measurements, Microwave Journal, March 2000, pp 68 on.
Microstrip transmission line calculations are in Hammerstad &
Jenson,
1980 IEEE MTT-S International Symposium Digest, May 1980, Washington,
D.C.,
IEEE catalog # 80CH1545-3MTT. Use the dispersion model of Kirschning
and R. H. Jansen, Electronics Letters, 1982 March 18, Vol. 18, No. 6, pp
272- 273, which was found better than that in H and J by S. Deibele and
J. B. Beyer, IEEE Trans MTT, Vol. MTT-35, No. 5, 1987 May, pp 535-538.
Single open end H. Jansen, Electronics Letters, 1982 March 18, Vol. 18,
No. 6, pp 272- 273, which was found better than that in H and J by S.
Deibele and J. B. Beyer, IEEE Trans MTT, Vol. MTT-35, No. 5, 1987 May,
pp 535-538. Single open end fringing length extension is from
Hammerstad & Bekkadal,"A microstrip handbook", ELAB report, STF 44
A74169, N7034, U/Trondheim-NTH, Norway, 1975 or eq. 5.6 in T. Edwards,
2nd ed., Foundations for Microstrip Design, Wiley, 1992.
Conductor insertion loss in dB per unit length, alpha-sub-c, is
based on known copper conductivity and skin depth effect for ideally
smooth surfaces to get a surface resistivity value Rs. When the ratio
of skin depth to conductor thickness increases at lower frequencies the
estimate Rs is lower than actual. The surface roughness, RMS,
correction to Rs is borrowed from the microstrip H & J reference and its
degree of accuracy is uncertain.
Rs,c=Rs*(1+2/pi*ArcTan(1.4*(RMS/(2.1*(1/F)^0.5))^2)) where F is in GHz.
The offset stripline calculations are based on formulas in STRIPLINE
CIRCUIT DESIGN, Harlan Howe, Jr., Artech House, Inc, 1982 printing, pp
36-41.
The temperature rise, current and power limits are based on simple
and
conservative formulas in Rogers product literature RT3.3.2 Temperature
Rise
Estimations in RT/duroid Circuit Boards Carrying Direct or RF Current.
Thermal conductivity values per ASTM C518 were revised on 96Jan24 per
list in SP9601 & internal TR5319. Product data sheet updates are due.
Simplified digital formulas for impedance for some design types
are
included for comparison only but not recommended. Published for digital
applications, they usually work adequately over a small parameter range.
*Digital Z0 for offset stripline*: H. W. Markstein, Impedances Dictate
Backplane Design, Electronic Packaging & Design, 93Dec, pp38-40.;
Stripline
digital Z0 and digital Z0,differential edgewise from LVDS Owner's
Manual,
2nd ed., p25, National Semiconductor, www.national.com/appinfo/lvds/,
also
from IPC-2141A, 99Sep 1st working draft.
Microstrip digital Z0 from 99Sep
IPC-2141A, given as "Z0=87*ln(5.98*H/(0.8*W+T))/(Sqrt(E)+1.41)"
