ODUNGE STANS
5 days ago
Define the following as applied to communication antennas. Gain Effective area
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Google Gemini AI
5 days ago
Gain
In the context of communication antennas, gain refers to the ratio of the power density transmitted in a specific direction compared to the power density radiated by an isotropic antenna with the same input power. It is expressed in decibels (dB) and measures the antenna's ability to focus radio energy in a particular direction. A higher gain antenna concentrates the signal in a narrower beam, resulting in stronger signals within that beam.
Effective Area
Effective area, also known as effective aperture, represents the area of an electrically small antenna that, when perfectly matched to its transmission line, would capture and radiate the same amount of power as the actual antenna. It is expressed in square meters (m²) and is a measure of the antenna's ability to intercept and convert radio waves into electrical signals.
The effective area and gain of an antenna are related through the Friis transmission equation:
```
Gain (dBi) = 10 log10 (4π - Effective Area (m²) - Frequency (Hz²) / (3 - 10⁸ m/s)²)
```
In the context of communication antennas, gain refers to the ratio of the power density transmitted in a specific direction compared to the power density radiated by an isotropic antenna with the same input power. It is expressed in decibels (dB) and measures the antenna's ability to focus radio energy in a particular direction. A higher gain antenna concentrates the signal in a narrower beam, resulting in stronger signals within that beam.
Effective Area
Effective area, also known as effective aperture, represents the area of an electrically small antenna that, when perfectly matched to its transmission line, would capture and radiate the same amount of power as the actual antenna. It is expressed in square meters (m²) and is a measure of the antenna's ability to intercept and convert radio waves into electrical signals.
The effective area and gain of an antenna are related through the Friis transmission equation:
```
Gain (dBi) = 10 log10 (4π - Effective Area (m²) - Frequency (Hz²) / (3 - 10⁸ m/s)²)
```
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