Beam Forming Networks on the Base of Coupled Waveguides for Multi-beam Hybrid Antennas

Proposed and investigated theoretically, numerically and experimentally a new class of beam forming networks for multi-beam hybrid antennas. The main part of the beam-forming network is a system of coupled waveguides. The following types of beam-forming networks are considered: one-dimensional (linear) with identical coupled waveguides and fixed phase shifters, linear with different coupled waveguides without phase shifters, two-dimensional with rectangular grid, identical waveguides and phase shifters, two-dimensional with rectangular grid and different waveguides, two-dimensional with hexagonal grid, identical waveguides and phase shifters. All the devices have several input ports and form in free space several sector type radiation patterns which are optimal for illumination of optical system.