A new differential beamformer architecture was proposed to solve the problems of high power consumption and large scale of the traditional multiplexing network architecture, in order to make direct connection between beamformer and differential feed antennas, suppress noise and interference. The differential active delay units were used to replace the passive delay units and buffers on one-way path in the traditional architecture, and combined with the differential passive delay units on two-way path to form the fixed delay time differences among different paths. Based on HHNEC 0.18 μm CMOS technology, a four-input-four-output beamformer was designed to verify the proposed architecture. Simulation showed that in the 0.5—1.5 GHz bandwidth, the resolution of the delay network was 80 ps, the maximum delay value was 720 ps, the delay variation root mean square value was 29.7 ps, the output reflection coefficient of the circuit was lower than –23 dB, the input reflection coefficient was lower than ?10 dB, the in-band synthesis gain was 18—21 dB, the layout area was 2.96 mm × 3.22 mm, and the total power consumption at 1.8 V supply voltage was 303 mW. Experimental results show that the proposed structure has the advantages of high accuracy, moderate scale, low power consumption and low complexity.