If a radio antenna's length is significantly smaller than the wavelength of the emitted electromagnetic wave, which consequence follows regarding radiation efficiency?

💡 Explanation

A small antenna compared to the wavelength causes a significant impedance mismatch, because it results in a large reactive component and low radiation resistance, therefore reducing radiation efficiency rather than enhancing it or primarily affecting polarization or radiation patterns.

• Why does molecular speed distribution broaden for gas in a cylinder heated from 300K to 600K?
• If a linear transformation matrix is applied to a vector representing the initial state of a damped harmonic oscillator, which consequence follows?
• An engineer designs a solid-oxide fuel cell (SOFC) stack operating at 800°C. Which risk increases as the operational enthalpy deviates negatively from the design value?
• Why does a solid-state catalyst typically accelerate a reaction, even though reactants must transition to an adsorbed state?
• If a strong external electric field is applied to carbon nanotubes functionalized with highly electronegative fluorine atoms, which consequence follows?
• A quantum electrodynamics calculation estimates the probability of two electrons scattering. Which effect increases the scattering cross-section when the electromagnetic coupling constant is larger?