Abstract
A new class of low-profile resonators, named split-distributed resonators is introduced in this paper. The newly proposed resonator family features high quality Q-factors and relies not only on the coupling among the constituent resonant elements, but the constituent elements themselves are also made in the distributed form. This, in comparison with the standard distributed resonator, caters for extremely low profiles, while allowing for a more uniform distribution of the electromagnetic fields inside the resonant cavity and hence higher unloaded quality factors. Furthermore, a uniform distribution of the electromagnetic fields facilitates a tremendous reduction of the resonator volume. As an experimental verification, two 5-pole band-pass filters using different realizations of individual resonant elements are designed and fabricated. The filters operate at a centre frequency of 1.8 GHz with a percentage bandwidth of 2%. The individual split-distributed resonator of these filters consists of 9 resonant elements, where each element is a distributed resonator of the second order and fourth order respectively. The measured insertion losses of the filters are in a good agreement with the values predicted by the simulations.
Highlights
Filters are of vital importance to all telecommunication systems
Even though the fundamental principles of the operation of filters have been known since the second part of the 20th century, novel filter realisations dedicated to miniaturisation, improved power handling and excellent electrical performance are still of great significance
A new class of low-profile and low-volume cavity resonators is introduced in this paper
Summary
Filters are of vital importance to all telecommunication systems. Even though the fundamental principles of the operation of filters have been known since the second part of the 20th century, novel filter realisations dedicated to miniaturisation, improved power handling and excellent electrical performance are still of great significance. Even though this configuration offers good performance, the major limiting factor lies with the large and necessary frequency separation between the resonant frequencies of the resonant posts, so as to maintain a low mutual coupling level Another type of low-profile coaxial cavity filters was considered in [17]. The major gain of this new configuration lies with the fact the resulting resonant posts couple along the horizontal and vertical axes, but along the respective diagonals too. This results in a more uniform distribution of the electrical fields within the cavity, which demonstrates through the reduction of the resonator footprint, while retaining excellent electrical performance. It can be shown that ω2 is always lower than ω1 and, as such, it is of importance to the realization of miniaturized resonators
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