948 THE BELL SYSTEM TECHNICAL JOURNAL, SEPTEMBER 1952 



X: AC reactance of a laminated stack. 



x: Rectangular coordinate in the direction of magnetic field 



in a plane Clogston line. 



y: Rectangular coordinate in the direction normal to the 



stacks in a plane Clogston line. 



Z: Surface impedance of a plane or cylindrical boundary; 



ratio of tangential components of the electric and mag- 

 netic fields (subscripts explained in context). 



Zk : Characteristic impedance of a transmission line. 



z: Rectangular coordinate in the direction of wave propa- 



gation. 



a: Re 7; attenuation constant. 



/3: Im 7; phase constant. 



T: Propagation constant per double layer normal to lam- 



inated stack. 



r^ : r/(fi + ^2); average propagation constant per unit dis- 



tance normal to laminated stack. 



7: Propagation constant in longitudinal direction. 



A: Effective skin depth; the depth at which the current den- 



sity in an infinite plane stack has fallen to 1/e of its value 

 at the surface. A small change in a quantity. 



8: \/2/o3iJLg; skin thickness in a solid conductor. 



e: Dielectric constant (capacitivity or permittivity). 



e: €2/(1 — 6); average dielectric constant measured normal 



to laminated stack. 



€, : e/€i, ; relative dielectric constant. 



€v : Dielectric constant of vacuum; 8.854 X 10~ farads -me- 



ter" . 



e', e'': Real and (negative) imaginary parts of complex dielectric 



constant. 



f: taiC^(n''/fi'); phase angle of complex permeability. 



■q: \/iwm/ (g + ^'we) ; intrinsic impedance of medium. 



77„ : Intrinsic impedance of vacuum; 376.7 ohms. 



rjy , r]p : 7j(l — y'/aY; characteristic impedance looking in the 



y- or p-direction in a homogeneous medium. 



0: (1 + i)ii/5i ; a parameter related to the electrical thick- 



ness of a conducting layer. 



d: h/(ti -\- ^2); fraction of stack volume filled by conducting 



layers. 



(c: (o- — 7 )'; transverse propagation constant in the y- or 



p-direction in a homogeneous medium. 



