Now a days the reflector based compact antenna test ranges are in demand due to increasing measurement accuracy requirements, large size antenna characterization in controlled environment and considering fast and real time measurement requirement
The far-field antenna measurement offers a quick estimation of antenna performance. The traditional farfield concept demands a large separation between transmit and receive side, which is practically impossible for large size of antenna at higher frequencies. The reflector-based compact antenna range offers all the advantages of far-field and simulate a far-field equivalent environment in a very compact indoor test chamber.
The additional advantages offered by Compact range are control temperature, no wind deflection, avoided rain, 24×7 operation ability and also reduces the maintenance costs. Sempra & Patel Machinery offers Custom models of different sizes can also be manufactured to meet specific customer requirements upto 200GHz.
Sempra & Patel Machinery have capability to deliver high planarity (<30 micron RMS) reflectors panels upto size of 7.0 m X 3.0 m to construct the range reflector optics. We are capable to take turnkey project including the engineering, manufacturing and installation of reflectors, multi-axes positioning system, and integrated measurement test setup and data acquisition system software.
In Reflector based Compact Ranges the plane wave is synthesized by a reflector system that collimates the spherical wave generated by range feed. And the quality of plane wave generated in antenna test zone are far better than traditional far-field.
The range operational high frequency will be decided based on reflector surface RMS finish (better than λ/55, where λ is the shortest wavelength corresponding to highest operational frequency). Similar the low frequency operations will be limited by the length of serrations (minimum 5λ), reflector dimension (minimum 20λ) in terms of electrical wavelength and the height of pyramidal absorbers
The dual reflector system will be illuminated by dual polarized corrugated range feed having cross-polarization better than 40dB.
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