Design and implementation of an adaptive beamformer for phased array antenna applications

Abstract

A modular beamformer, fully scalable in amplitude and phase, to be used with transmitting antenna arrays operating in the Digital Cellular System (DCS)/Personal Communications Service (PCS) frequency band, is designed and fabricated in this paper. The implementation of the structure is simple and very low cost; its performance is evaluated by measuring the frequency response, as well as the radiation patterns produced by an antenna array connected to the output of the beamformer. The latter exhibits low return losses and average amplitude imbalance less than ±0.8 dB, whereas the phase deviations do not exceed ±6° on average, over its 300 MHz bandwidth.

Broadband RF Phased Array Design with MEEP: Comparisons to Array Theory in Two and Three Dimensions

“…The index of refraction varies within the ice because of the transition between surface snow (ρ ≈ 0.4 g/cm 3 ) and the solid ice below (ρ = 0.917 g/cm 3 ). Most recent and intricate studies of phased array beam behavior still assume a uniform medium [24][25][26]. Embedded phased arrays with varying n(z) emit signals that curve in the direction of increasing n(z).…”