Antenna Reflector Size Calculator

Formula

To calculate the Reflector Diameter (D):

$D = \sqrt{\frac{10^{\left(\frac{G - 20 \log(f) + 147.55}{10}\right)}}{\pi \times 0.55}}$

Where:

$D$ is the Reflector Diameter (meters)
$G$ is the Gain (dBi)
$f$ is the Frequency (GHz)

What is an Antenna Reflector?

An antenna reflector is a device that reflects electromagnetic waves, typically used to direct the radio waves in a specific direction to improve signal strength and reception. Reflectors are commonly used in various types of antennas, including parabolic dish antennas, to enhance their performance by focusing the signal into a narrower beam. This results in higher gain and better directivity, making the antenna more efficient for long-distance communication and broadcasting.

Example Calculation 1

Let's assume the following values:

Gain ( $G$ ) = 30 dBi
Frequency ( $f$ ) = 5 GHz

Using the formula:

$D = \sqrt{\frac{10^{\left(\frac{30 - 20 \log_{10}(5) + 147.55}{10}\right)}}{\pi \times 0.55}} = 114,755,554.17 \text{ meters}$

The Reflector Diameter is 114,755,554.17 meters.

Example Calculation 2

Let's assume the following values:

Gain ( $G$ ) = 25 dBi
Frequency ( $f$ ) = 10 GHz

Using the formula:

$D = \sqrt{\frac{10^{\left(\frac{25 - 20 \log_{10}(10) + 147.55}{10}\right)}}{\pi \times 0.55}} = 2,295,111.08 \text{ meters}$

The Reflector Diameter is 2,295,111.08 meters.