🤖 AI Summary
This work addresses the lack of an effective Q-factor-based bandwidth estimation method for multiport antennas, which hinders accurate characterization of their frequency response. The study extends the classical single-port Q-factor theory to multiport scenarios by introducing an equivalent electromagnetic energy storage matrix associated with antenna ports. By integrating this matrix with the total effective reflection coefficient and multiport network parameters, the authors derive a closed-form analytical expression directly applicable to bandwidth prediction. The proposed framework elucidates how feed configurations and matching networks influence achievable bandwidth. Validation on both a dual-dipole array and an electrically large patch antenna array demonstrates the model’s high accuracy in evaluating bandwidth from a single-frequency-point measurement.
📝 Abstract
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.