This is probably one of the most useful utilities in Antenna Magus. It started as an in-house application used by the engineers to read off design values from scanned graphs (mostly from published papers that were only available in *.pdf or in hardcopy). After showing this to other engineers and seeing their excitement we decided to include this as a utility in Antenna Magus.

Simply select your scanned graph image, specify anchor values and follow the trace(s) with your mouse. Apply the spline or linear function and export the XY values to a TSV (tab seperated values) file. It supports both polar and cartesian graphs.

While the chart is being traced, values relevant to the indicated data type are automatically extracted, making it easy to determine quantities such as bandwidth, sidelobe level etc. of the data. These values can then in turn be used for design or specification refinement.

This calculator converts angular values between different unit types. The factors used to convert to degrees are shown in the table below.

Convert from | Multiplication factor |
---|---|

Degree | 1 |

Radian | 180/π |

Gradian | 360/400 |

Minutes | 1/60 |

Seconds | 1/3600 |

Milliradians | 180/(1000*π) |

Revolution | 360 |

This calculator converts length values between different unit types. The factors used to convert to meters are shown in the table below.

Convert from | Multiplication factor |
---|---|

Micrometer | 1e-6 |

Micron | 1e-6 |

Millimeter | 1e-3 |

Centimeter | 1e-2 |

Meter | 1 |

Kilometer | 1e3 |

Mil | 25.4e-6 |

Inch | 25.4e-3 |

Foot | 0.3048 |

Yard | 0.9144 |

Mile | 1609.344 |

The equation below shows the relationship between a decibel value and a linear voltage/power ratio. This calculator is can be used in one of three ways:

- A decibel value can be specified and the linear voltage and power ratios will be returned.
- A linear voltage ratio can be specified and the decibel value together with the linear power ratio is returned.
- A linear power ratio can be specified and the decibel value together with the linear voltage ratio is returned.

dB = 20log_{10}(voltage ratio) = 10log_{10}(power ratio)

This calculator allows the conversion between various two-port parameters. The two-port parameters include Z (impedance), Y (admittance), ABCD (chain) and S (scattering).

Most microwave textbooks [e.g. Pozar] provide very useful conversion formulas to switch between various two-port parameter conventions. Often only conversions for simplified cases are provided, namely where the impedance values of port 1 (source) and port 2 (load) are real, equal, or where a common port and system impedance is enforced.

This calculator allows for the impedance of the two ports to be complex and unique by using the equations developed by Frickey. The image above shows a standard two-port network. The basic two-port equations are shown below.

The voltage standing wave ratio (VSWR), reflection coefficient (Τ), return loss and mismatch loss are all dependant on one or the other, as can be seen by the equations below.

This calculator consists of four design groups. Each group requires one objective input and the remaining three are returned.