The issues of constructing microwave diplexers are considered. The calculated ra-tios for the circuit elements are given. The possibility of transforming the circuit elements in order to achieve the necessary filter ratings for LTCC-based diplexers is shown. Diplexers in the form of LPF-PF and PF-PF are manufactured. The calculation and measurement of the input power of diplexers are carried out.
The article shows the potential for use of integral spiral microwave resonators in the LTCC structure and filters based on them. It provides calculated ratios, developed 3D model of the spiral filter and obtained calculated S-parameters of the filter model.
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