This paper describes the design and measured performance of a serial phase shift beamformer which uses a charge transfer device (CTD) for storing the element samples from a cylindrical array. By using a serial structure the amount of hardware needed for multiple beams can be reduced markedly from that needed in conventional parallel preformed beams. Since one beamformer produces all beams, the beams have the same spatial characteristics. To demonstrate the potential cost and space benefits of the new architecture, an experimental version was built and tested to confirm the operational characteristics. The array used for the test was an existing AN/WQS‐1 cylindrical array. The beam pattern of the CTD was measured in the ARL:UT test tank. As an aid to performance evaluation, a time delay beamformer was also housed in the AN/WQS‐1 cylinder. The beam patterns of the two show close agreement in main lobe and sidelobe structure.