Abstract: The present invention relates to a tuning arrangement for combiner filters which include a dielectric waveguide resonator (3) and a tuning capacitance (4) coacting therewith. According to the invention, the tuning capacitance (4) has the form of a substantially isosceles acute-angled triangle bent to a circular-cylindrical form with the cylinder axis parallel with the waveguide resonator (4). The apex of the triangle is attached to the center of the opposing side. The cylindrical tuning capacitance (4) can be rotated around the cylinder axis, for tuning the combiner filter.

Abstract: A combiner arrangement in a radio base station including a number of waveguide cavity resonators operating as channel filters in known manner. According to the invention, each resonator is divided into two substantially equal cavity resonsator parts. One base station transmitter is connected to one of the resonator parts and another transmitter is connected to the other resonator part. The decoupling of a resonator consists of two clamp-like elements situated in the center of the resonator. The coaxial connection to the antenna consists of coaxial pieces between the resonators and all the resonators are connected in series to the antenna.