A given lowpass antisynametrical ladder filter of even degree having only a capacitor in the output branch thereof that is connected to ground and is shunted by a load resistor is transformed to an equivalent inductorless network by simulation techniques wherein each inductor, resistor and capacitor of the given filter is replaced with an associated resistor, capacitor, and frequency dependent negative resistor (FDNR), respectively. The equivalent network has a pair of output terminals, one of which is grounded, with the parallel combination of a capacitor and an FDNR connected therebetween. This combination is simulated by a Riordan circuit having one port connected to the output terminals of the equivalent network and another port terminated by the parallel combination of a resistor and a capacitor which are connected to ground.
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