of rf resistor 839 shaped approximately as an asymmetric rhombus with possibly curved sides as shown in fig8 can be estimated using the integral equation or summation of small slices in the horizontal direction by equation r i u03c3r s u03b4 h t f x i where r s is the sheet resistance of the resistive material u03b4h is the height of the slice t is the thickness of the resistive material and f x i is the function of the curves for the i th slice an input end 827 forms the top while a grounding end 828 forms the bottom and tap ends 829 are on both sides of the structure of the rf resistor 829 the tapered edges 860 870 may be straight or curved inwards as shown by the dashed lines 861 871 according to the function f x i consider the rf resistor 839 as consisting of three portions two approximately trapezoidal structures and one central rectangular structure as shown in fig8 using the equation above the dc low frequency resistance r 1 and r 2 can be calculated for the upper and lower portions respectively similarly the resistance of the rectangular portion r r can also be calculated thus the total dc low frequency resistance is a summation of r 1 r 2 and r r the voltage dividing ratio required for proper operation of a rf signal detection circuit is r 1 r 1 r 2 in.