Antenna Efficiency Calculator

How to Use This Calculator

1. Enter the Input Power (total power supplied to the antenna) in Watts.
2. Enter the Antenna Gain in dBi (a measure of how well the antenna can direct or concentrate radio frequency energy in a particular direction).
3. Enter the Radiated Power (power actually radiated by the antenna) in Watts.
4. Click the Calculate button to compute the antenna efficiency.
5. Click Reset to clear all inputs and start over.

Understanding Antenna Efficiency

Antenna efficiency is a critical parameter that indicates how effectively an antenna converts input power to radiated power. It is expressed as a percentage and calculated as:

Efficiency (%) = (Radiated Power / Input Power) × 100%

A higher efficiency means less power is lost as heat or in other forms, resulting in better overall performance of the communication system.

Typical Efficiency Values

• Simple dipole antennas: ~80-85%
• High-gain directional antennas: ~90-95%
• Loop antennas: ~50-70%
• Parabolic reflector antennas: ~95-98%

Practical Applications

This calculator is useful for RF engineers, wireless communication technicians, and hobbyists who need to evaluate or compare antenna performance. It helps in selecting appropriate antennas for specific applications based on required efficiency.