1. What is an Antenna Parameter Calculator?

Definition: This calculator estimates the gain of an antenna based on its efficiency and directivity.

Purpose: It helps engineers and technicians determine the performance characteristics of antenna systems.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \(\text{Gain}\) — Antenna gain in decibels (dB)
• \(\text{Efficiency}\) — Ratio of radiated power to input power (0 to 1)
• \(\text{Directivity}\) — Measure of antenna's directional focus (unitless)

Explanation: The product of efficiency and directivity is converted to logarithmic scale (dB) to represent antenna gain.

3. Importance of Antenna Gain Calculation

Details: Proper gain estimation helps in designing communication systems, predicting coverage, and optimizing antenna performance.

4. Using the Calculator

Tips: Enter the efficiency as a decimal (e.g., 0.85 for 85%) and the directivity value. Both values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What is typical antenna efficiency?
A: Most practical antennas have efficiencies between 50% (0.5) and 95% (0.95).

Q2: How is directivity determined?
A: Directivity is calculated from the antenna's radiation pattern or can be estimated based on antenna type.

Q3: What's the difference between gain and directivity?
A: Gain accounts for losses (efficiency) while directivity describes only the directional properties.

Q4: Can gain be higher than directivity?
A: No, since efficiency ≤ 1, gain in dB is always ≤ directivity in dB.

Q5: Why use logarithmic scale for gain?
A: The dB scale conveniently represents large ratios and follows the logarithmic nature of human perception.