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This article presents a technique for miniaturization. The miniaturization is brought about by reducing the velocity of the wave, a phenomenon called slow wave propagation. The technique is demonstrated in this work using a microstrip line. Electromagnetic simulations show that the slow wave microstrip line has a cut‐off frequency of 18.76 GHz and hence behaves like a low pass filter. The low pass nature is also confirmed from the lumped equivalence. The fabrication complexity is reduced by replacing a substrate filled with plated vias with a substrate bearing three rows of plated vias beneath the microstrip line, both of which show similar performances. The slow wave concept is confirmed from the value of group delay and is found to be enhanced in the slow wave line by 21.21%. Implementation of slow wave also results in a 36.3% increase in the effective permittivity. Parametric studies are conducted to analyze the slow wave phenomenon. For proof of concept, the technique is compared to the standard Chebyshev filter. The proposed structure reduces area by 40%. The proposed structure is then fabricated and performance is measured. The measured and simulated results are in good agreement.

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Miniaturization is an important criteria in the selection of devices for next generation communication systems. A novel miniaturization technique for an inductive post filter is investigated in this paper. Miniaturization is not so popular in inductive post Substrate Integrated Waveguide (SIW) filter and so considerable amount of research is to be done in this domain. A band pass filter in SIW technology using inductive posts is realized and further analyses are carried out. The insertion loss in the pass band is found to be 0.5 dB and the return loss is 22 dB. In this paper, we investigate the use of slow wave technology for miniaturization. Unlike the conventional SIW, the slow wave SIW topology requires a double layer substrate with internal metallized vias introduced in the bottom layer connected to the bottom conductive plane. The number of rows of internal metallized vias was chosen based on a parametric study. The proposed miniaturization technique shows that the SIW filter is 21.6 % and 34.6 % miniaturized in size and area respectively. The response of the filter covers Ka band and hence is suitable for satellite communication application. A quality factor of 506 is achieved for the miniaturized filter.