## Spherical Near-field Antenna MeasurementsThe subject of antenna measurements is one which has undergone revolutionary changes in recent years, in particular within space applications, where high demands are placed upon antenna design and construction. This book represents the specific measurement technique known as the spherical near-field method. The theoretical treatment of the method is detailed but of sufficient generality to make the book useful as a basis for further research on near-field measurements and antenna coupling problems. Practical aspects of antenna test ranges, data processing schemes and measurement procedures are described. Other topics covered are measurement error analysis and generation of plane wave fields. The authors draw on the experience from the development, sponsored by the European Space Agency, of one of the first spherical near-field test ranges. They have contributed to the establishment of spherical near-field testing as a highly accurate and versatile method, currently under implementation at test ranges worldwide. |

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### Contents

Scattering matrix description of an antenna | 8 |

Scattering matrix description of antenna coupling | 61 |

Data reduction in spherical nearfield mesaurements | 89 |

Copyright | |

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### Common terms and phrases

alignment amplitude angle angular antenna measurements aperture array assumed autocollimation calibration Chapter coordinate system cross-polar current distribution defined determined directivity discrete Fourier transform electric dipole electromagnetic equations error Euler angles evaluated far-field pattern field components given IEEE inaccuracies input probe linear lobe magnetic dipole Maxwell's equations measurement distance measurement sphere minimum sphere near-field scanning number of samples obtained orthogonality output probe parameters phase phi axis planar plane wave plane-wave deviation plane-wave field plane-wave zone probe correction probe pattern propagation radiated radius receiving coefficients reflection coefficient reflector antenna region response constants rotation scattering matrix Section sequence set-up shown in Fig simulations spherical coordinate system spherical mode spherical near-field measurements spherical near-field testing spherical scanning spherical wave expansion spherical wave functions symmetry tangential components test antenna test range test zone theodolite theta axis theta integral transmission formula transmitting coefficients truncation values vector waveguide z-axis zero