Miniaturized Microstrip Suppressing Cell with Wide Stopband

In this paper, based on simple stepped impedance structures a methodology is followed to design a very compact size lowpass filter (LPF) as a suppressing cell. The proposed suppressing cell consists of stepped impedance ladder-type resonators, which provides a wide stopband by creating the transmission zeros to its frequency response. The proposed suppressing cell has clear advantages like low insertion loss in the passband and suitable roll-off. The designed LPF is fabricated on a microstrip layout and tested. The measured results highlight the efficiency of the filter and have a good agreement with the simulated results. With mentioned expression, the fabricated LPF can be a powerful block as a suppressing cell to implement in the distributed high frequency circuits.

Lowpass filter, microstrip, miniaturized, stepped impedance structure, suppressing cell