Multiport Antenna Q-factor
This work provides a theoretical framework for evaluating bandwidth of multiport antennas, which is important for antenna designers dealing with arrays.
The authors propose a method to estimate multiport antenna bandwidth by generalizing the single-port Q-factor, deriving formulas that use the total active reflection coefficient for single-frequency evaluation. The theory is validated with examples of dipole and patch antenna arrays.
This article proposes an estimate of multiport antenna bandwidth based on a generalization of a single-port Q-factor. The explicit derivation is based on converting the stored energy matrix to its port equivalent and on the port parameters themselves. The work discusses the bandwidth dependencies on feeding and matching. Derived formulas are shown to utilize the total active reflection coefficient and allow for a single-frequency bandwidth evaluation. Examples comprising two different dipole arrays and electrically large patch antenna arrays validate the theory.