Antenna Pattern
Understanding Antenna Pattern
Antenna radiation patterns are typically displayed as two-dimensional cuts through the three-dimensional pattern, showing the E-plane and H-plane responses. The main lobe, sidelobes, back lobe, and nulls characterize the pattern shape.
Pattern measurements include half-power beamwidth, first sidelobe level, front-to-back ratio, and cross-polarization discrimination. These parameters determine an antenna's ability to focus energy and reject interference.
Frequently Asked Questions
What is the difference between E-plane and H-plane patterns?
The E-plane contains the electric field vector and the direction of maximum radiation. The H-plane contains the magnetic field vector and is perpendicular to the E-plane.
How are antenna patterns measured?
Patterns are measured by rotating the antenna under test while recording the received signal strength at each angle, typically in an anechoic chamber.