An Outdoor Measurement Technique for Large Structures Antennas
Résumé
This paper presents the radiation pattern measurement of a monopole installed on a large structure (carrier) in non anechoic environment. Proposed method is based on Cylindrical Modes Coefficients (CMC) decomposition and modal filtering to suppress reflections. First Cylindrical Near to Far Field Transformation and CMCs computing are described. An association of cylindrical near-field to far-field and modal filtering is applied to get the true far-field of a monopole installed on an aircraft on the ground. Simulation results at low angle of elevation (theta=90°,80°,70°) are compared at 88 MHz between the radiation pattern of reference, that is the far field of the antenna in presence of the carrier, and the reconstructed radiation pattern. A good match between the two curves is observed.
Mots clés
Indexes
Filtering
Wavelength measurement
Magnetic field measurement
antennas measurements
large structures
near-fied to far-field transformatione
cylindrical modes decomposition
modal filtering}
modal filtering
radiation pattern measurement
structures antennas
outdoor measurement technique
reflections
monopole antenna
cylindrical modes coefficients decomposition
monopole antennas
filtering theory
{antenna radiation patterns
CMC
nonanechoic environment
frequency 88.0 MHz
cylindrical near-field
Antenna measurements
reconstructed radiation pattern
Antenna radiation patterns
Reflection