ITU-R S672 Circular Antenna
A circular antenna pattern modeled on equations given in ITU-R S672.
This antenna uses a polar coordinate system.
| Parameter | Description |
|---|---|
| Design Frequency |
This is the frequency of the antenna. The antenna design frequency is independent of the operational frequency of a transmitter, receiver, or radar. Changing the frequency of a transmitter, receiver, or radar does not update an embedded antenna's design frequency, nor vice versa. The design frequency is solely used at antenna configuration time to compute the antenna size from its max gain or beamwidth settings. A mismatch between signal frequency and antenna design frequency typically causes performance degradation. |
| Main-lobe Gain | The maximum gain of the main lobe of the antenna pattern. |
| Efficiency | The aperture efficiency of the antenna. This value accounts for all the losses between the incident wavefront and the output of the antenna. This field is not required by the ITU-R recommendations. Yet, it is provided for consistency with other antenna types and to help account for any antenna losses. By default, the efficiency is set to a value of 100% or zero loss. |
| Diameter | Diameter of the dish. |
| Use Main-Lobe Model |
The main lobe (φ ranges between the value 0 and φmin) is not defined for this antenna model. If Use Main-Lobe Model is not selected, this range of φ is modeled as a constant or flat gain at the Main-lobe Gain value. If selected, this range of φ is modeled using the ITU Radio Regulations Appendix 8 main lobe model. |
| Half Beamwidth | One half of the 3dB beamwidth. |
| Near-in Side Lobe Level | The level of the first side lobe relative to the main lobe peak gain. |
| Far-out Side Lobe Level | Far-out side lobe level. This value is 0 dBi for ideal patterns. |