A compact, low‐cost Wilkinson power divider (WPD) of 1.3 GHz (f0) operating frequency, with a low‐pass filtering response, is presented in this study. Power division and low‐pass filtering responses are both achieved by using two symmetrical units of interdigital line resonators (ILRs). Each square unit of ILR exhibits a low‐pass filtering response, with a minimum insertion loss of 0.3 dB. The dumbbell‐shaped, defected ground structures are introduced for widening the attenuation band by suppressing the harmonics up to 14 GHz (up to 10.76 f0) and also for miniaturising the circuit. An isolation resistor of 100 Ω is placed between two output ports of the WPD for obtaining good isolation. The operating frequency of the low‐pass filter is 2 GHz with an attenuation of −17 dB up to 20 GHz. The proposed structure is fabricated using low‐cost substrate material FR4. Both the low‐pass filter and the power divider are fabricated and measured. The electromagnetic‐simulated and measurement results are experimentally verified.

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A compact low-cost lowpass filter (LPF) with sharp roll-off and wide attenuation band using stepped impedance resonator loaded with interdigital fingers and U-shaped resonator is recommended in this article. The proposed LPF has a cut-off frequency of 1.2 GHz with a sharp roll-off 135 dB/GHz and passband insertion loss 0.35 dB. An array of two different shapes of defected ground structures are etched in the ground plane for introducing additional transmission zeroes to enhance the stopband performance. The relative stopband suppression is achieved up to 171% with a suppression factor of 2. The proposed structure is modelled, fabricated, and measured. The measurement results are found to be well-matched with the simulated ones. Eventually, a high figure of merit of 21 600 is achieved. K E Y W O R D S defected ground structures, figure of merit, interdigital lines, lowpass filter, stepped impedance resonator, U-shaped resonator