Patent ID: 8063723

Claim:
A filter, comprising: a first cylindrical dielectric resonator electrically coupled to a signal input port; a second cylindrical dielectric resonator electrically coupled to the first resonator; a third cylindrical dielectric resonator electrically coupled to the second resonator; a fourth cylindrical dielectric resonator electrically coupled to the third resonator and to a signal output port; and a cross-coupling link, electrically coupled to the first and fourth resonators, comprising: a crossbar having two ends; a first fixed vertical support depending from one end of the crossbar; a second fixed vertical support depending from the other end of the crossbar; a first curved horizontal coupling arm, extending from the lower end of the first vertical support, electrically coupled to the first resonator; a second curved horizontal coupling arm, extending from the lower end of the second vertical support, electrically coupled to the fourth resonator; a first adjustable vertical support, extending upwards from an end of the first coupling arm, including a mechanical fastener disposed at an upper end; and a second adjustable vertical support, extending upwards from an end of the second coupling arm, including a mechanical fastener disposed at an upper end.