Abstract: A new coupling structure for helical filters has been Presented.It is realized with a single cylindric shield, the belieal resonators are fixed transversely in the cylinder.No iris is necessary for separation between the resonators.The couplings between the resonators depend mainly on the distances and the angles between them. Compared with the general rectangular shield belieal filters,the new type is simpler in structure and easier to adjust. Besides these,the realizable bandwidth of the filter is fairly wide.Some experimental results for the filters are given,one has bandwidth of 27% without special measure employed,and another has two evident attenuation poles on either side of the passband.