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This article studies a filter belonging to the category of bandpass filters. This filter has two resonators located on the substrate with dielectric conductivity ε=4.4 and thickness h=1.5 mm. Resonators used in the bandpass filter (BPF) allowed for technologically realizable structures with smaller sizes as compared to standard structures. The electrodynamic simulation program was used in order to...
The L-band band-pass interdigital filter was studied, a large number of experimental data showed that bandwidth narrowed with the increasing of resonator width, and the center frequency becomes larger with the reducing of the resonator length; the bandwidth will widen when the distance between resonator was reduced. Change coupled structure, increase the effective coupling area of the microstrip line...
Miniaturized microstrip ring filter is presented. Four lumped capacitors are added in the initial ring resonator topology to shift the resonant frequency to about 50% of its nominal value, leading to size reduction of the filter. The required value of the capacitors is calculated using tuning synthesis equations of the ring resonator. The passband response of the filter is improved by modifying the...
Two slots oriented orthogonal to each other are cut on a circular patch resonator. The slots bring down the fundamental resonance frequency of the patch. The second higher order mode, however, remains unaffected. This effectively miniaturizes the patch by 57.8% at the same time increases the harmonic separation by 2.51 times. By adding two more slots parallel to and on both the sides of each arm of...
A new type of dual mode patch resonator is proposed and dual-mode bandpass filters are designed by perturbing its degenerate modes using two slots which are orthogonal to each other. It has been shown that resonant frequencies of the degenerate modes can be varied independently by adjusting one slot length at a time. Geometrical size as well as radiation loss has been reduced further by using inductively...
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