Test Bench for Metal Mesh Rf Emissivity Measurement with Radiometric Approach

• Country: Netherlands
• Summary: Test Bench for Metal Mesh Rf Emissivity Measurement with Radiometric Approach
• NLT Ref No: 89930464
• Deadline: 08 Nov 2023
• Financier: Agency for the Cooperation of Energy Regulators (ACER)
• Purchaser Ownership: Government
• Tender Value: Refer Document
• Notice Type: Tender
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• Description:
• Test Bench for Metal Mesh Rf Emissivity Measurement with Radiometric Approach Spaceborne microwave radiometers are more and more in need of large RF radiating aperture inorder to achieve high spatial resolution on ground. In order to be able to accommodate the large RF radiating aperture antenna under the launcher fairing, the antennas are in general based onlarge deployable mesh reflectors with a high packaging efficiency. Earth remote sensing missions such as CIMR or CryoRad are based on multi-frequency radiometers using a large RF radiatingaperture. The frequencies of operation of these radiometers are typically ranging from UHF to Kaband. The mesh used as RF reflective surface technology for the large deployable reflector isdesigned to be as RF reflective as possible while exhibits optical semi-transparency.The knowledge of the physical temperature of the reflective surface and its RF emissivity is crucialfor the instrument calibration and to reduce the uncertainty on the observed brightnesstemperature. For this reason, an accurate RF characterization of the mesh is of paramountimportance to ensure the instrument performance. Free space measurements are usually performed in order to assess the mesh RF reflectivity loss. However, the measurement uncertainty of this technique does not achieve the accuracy required for the radiometric application. To obtain the meshRF emissivity with the required accuracy, a candidate technique is measuring reflectivity and transmissivity making use of a radiometer. This activity aims at designing a test bench for characterizing the RF emissivity of metal mesh samples from 0.4 to 40GHz, in ambient.This activity is divided into two phases and encompasses the following tasks:Phase 1:- Analysis of the different test bench concepts and trade-off- Analysis of feasibility of RF emissivity characterization under different parameters such as angle of incidence, polarization, mesh bi-axial mesh tensioning- Assessment of uncertainties and feasibility in different thermal conditions-Development plan and cost breakdownPhase 2:- Critical breadboarding to prove the achievable accuracy and consolidate the uncertaintybudget- Detailed design and test bench manufacturing- Test campaign at a selected frequency band to prove measurements accuracyProcurement Policy: C(2) = A relevant participation (in terms of quality and quantity) of non-primes (incl. SMEs) is required.
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