An active electronically scanned array (AESA) beamforming method that provides enhanced selectivity (interference rejection) for the same number of antennas compared to conventional delay-and-sum (DAS) beamforming is proposed. Conventional DAS 2-D transfer function is modified by introducing complex pole-manifolds based on recently proposed 2-D infinite impulse response (IIR) beam filters, at guaranteed stability. A continuous-time domain signal flow graph is proposed based on first order all-pass filters that eliminate the need of transmission line-based delays used in conventional DAS beamformers. Improved interference rejection is verified using closed-form signal processing models. For an array of 64 antennas, with desired signal direction of arrival (DOA) 10 and interference DOA from array broadside, the proposed scheme shows an improvement in the signal-to-interference ratio (SIR) around 7 dB for the same number of antennas, compared to DAS beamforming. The improvement in interference rejection is observed for both uniform and non-uniform aperture weights in terms of side lobe performance. A feasibility study is presented on potential CMOS circuit implementation of the proposed AESA for a linear array of eight antennas and maximum operational frequency of 1 GHz.