Fundamental bounds on MIMO antennas

Abstract

Antenna current optimization is often used to analyze the optimal performance of antennas. Antenna performance can be quantified in e.g., minimum Q-factor and efficiency. The performance of MIMO antennas is more involved and, in general, a single parameter is not sufficient to quantify it. Here, the capacity of an idealized channel is used as the main performance quantity. An optimization problem in the current distribution for optimal capacity, measured in spectral efficiency, given a fixed Q-factor and efficiency is formulated as a semi-definite optimization problem. A model order reduction based on characteristic and energy modes is employed to improve the computational efficiency. The performance bound is illustrated by solving the optimization problem numerically for rectangular plates and spherical shells.

References in corpus (3)

• Minimization of Antenna Quality Factor
• Fundamental bounds on MIMO antennas
• Physical bounds and radiation modes for MIMO antennas

Cited by in corpus (9)

• Maximum Gain, Effective Area, and Directivity
• Computational Aspects of Characteristic Mode Decomposition -- An Overview
• Fundamental bounds on MIMO antennas
• Capacity Bounds and Degrees of Freedom for MIMO Antennas Constrained by Q-Factor
• Physical bounds and radiation modes for MIMO antennas
• Degrees of Freedom for Radiating Systems
• Excitation of Orthogonal Radiation States
• Shadow Area and Degrees of Freedom for Free-Space Communication
• Antenna Current Optimization and Realizations for Far-Field Pattern Shaping