The Radiation Efficiency Cost of Resonance Tuning

Abstract

Existing optimization methods are used to calculate the upper-bounds on radiation efficiency with and without the constraint on self-resonance. These bounds are used for the design and assessment of small electric-dipole-type antennas. We demonstrate that the assumption of lossless, lumped, external tuning skews the true nature of radiation efficiency bounds when practical material characteristics are used in the tuning network. A major result is that, when realistic (e.g., finite conductivity) materials are used, small antenna systems exhibit dissipation factors which scale as $(ka{)}^{-4}$, rather than $(ka{)}^{-2}$ as previously predicted under the assumption of lossless external tuning.

7 pages, 10 figures

References in corpus (3)

• Fundamental Efficiency Limits for Small Metallic Antennas
• Minimization of Antenna Quality Factor
• Dissipation Factors of Spherical Current Modes on Multiple Spherical Layers

Cited by in corpus (7)

• Maximum Gain, Effective Area, and Directivity
• Trade-off Between Antenna Efficiency and Q-Factor
• Upper bounds on absorption and scattering
• Optimal Planar Electric Dipole Antenna
• Harnessing superdirectivity in dielectric spherical multilayer antennas
• A Role of Symmetries in Evaluation of Fundamental Bounds
• Radiation Efficiency Limits in Direct Antenna Modulation Transmitters