Multi-port matching efficiency in antenna systems with cascaded networks

A general compact formula for multi-port matching efficiency in the presence of an arbitrary number of cascaded networks is introduced. A comparison between the decoupling efficiency and multi-port matching efficiency is presented. Similarly, a compact formula for decoupling efficiency in a cascaded chain is provided. The presented compact formulas are quite advantageous for optimization of radiation efficiencies by designing a proper matching network

Efficiency characterisation of multi-port antennas

A simple radiation efficiency metric is introduced to include the effects of non-ideal source/receiver impedances. The features of this parameter are highlighted and its compact formula is derived. The notion of mean matching efficiency is established. Simulations prove that this matching efficiency is quite useful in a quick estimation of diversity performance of multi-port antennas in rich isotropic multipath environments

Coupling effects on richness threshold of multi-port antennas in multipath environments

This paper investigates convergence in diversity gain of multi-port antennas in non-rich multipath environments. It is shown that diversity gain convergence is faster in the presence of strong coupling. In this situation, richness threshold is also smaller. Furthermore, by linking convergence in diversity gain to convergence in antenna ports\u27 correlations, the role of pattern diversity caused by coupling is highlighted. A range of variation for correlations is defined whose upper bound is used to quantify pattern diversity. The lower bound for this range is the corresponding spatial correlation in a rich multipath environment

Electronically scanning beamformers based on ferroelectric technology

Basic properties and the potential of ferroelectrics for applications in electronically scanned beamformers are discussed. Low drive power consumption, relatively low losses, high speed, and the possibilities of realisation cost effective beamformers are the main advantages offered by ferroelectric technology. A brief review of ferroelectric scanning antennas is also given