Design of balanced power dividers using resistor CAD models

Modelling of single section to three-section 3 dB balanced power dividers has been performed taking into account recently developed chip resistor CAD models. Real resistors may significantly degrade the isolation of the divider's output ports and considerably affect the input reflection coefficients. Re-optimising of divider counteracts this effect, leading to circuit parameters close to those that would be obtained with perfect resistors. Practical example of a microstrip divider designed and optimised for high isolation in the GSM and DCS frequency bands supports the numerical results.