On Optimal Port Loading Conditions for Maximizing Product of Energy Gain and Bandwidth in Broadband Antenna Links

A theory is given on maximizing the product of energy gain and bandwidth for broadband signal transmission in wireless links with dispersive antennas, which are properly terminated to the transmitter and receiver front-ends. For this, a cascaded network model of the two-antenna channel based on the link decomposition theory is employed to indicate practical conditions on maximizing gain-bandwidth product through selections of: i) real, dispersive antenna geometries; ii) their port terminations; and iii) assigned operational passbands. As a result, the gain-bandwidth product can be optimized for any given antenna geometry by appropriately specified terminal loads and operational bandwidths and vice-versa. This paper is numerically illustrated for canonical flat and solid dipole antennas by inspecting the predicted values of link gain-bandwidth products and related deviations of group delay used to measure signal distortions.