Synthesis of SIW Filters in the Millimeter Wavelength Range
DOI:
https://doi.org/10.20535/RADAP.2025.100.%25pKeywords:
SIW, band-pass filter, millimeter wavelength range, dimensional synthesisAbstract
The paper presents the results of the development of bandpass filters of the millimeter wavelength range, manufactured using SIW technology. Most attention is paid to the insufficiently covered in modern literature procedure for the synthesis of such filters, which makes it possible to find all the dimensions of the filter topology elements (the so-called dimensional synthesis). It was shown that the use of the standard procedure for the synthesis of bandpass SIW filters leads to unsatisfactory results. The identified reasons for this allowed us to make the necessary adjustments to the calculation method. Although the specified development of the synthesis procedure is performed on the example of a common topology of a bandpass SIW filter on inductive pins, the considered structure differs favorably from the standard one for this case in that the role of the extreme inhomogeneities of the filter here is performed by the SIW excitation nodes from the input and output microstrip lines. This allows to significantly reduce the size of the filter, the level of its losses, and also to improve the topological flexibility when integrating the SIW filter into the system using a linear or angular implementation of its topology. The results of theoretical calculations are compared with the data obtained when measuring the parameters of the manufactured samples, and the latter with the known data on the parameters of waveguide-planar filters with similar characteristics. It is shown that although the latter have better characteristics in terms of minimum losses, SIW filters made on modern dielectric materials are comparable to them in this parameter, but significantly surpass them in terms of manufacturability, compactness and economic attractiveness.
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