Low noise amplifier with frequency converter in KU Band (LNB - Low Noise Block) for use with parabolic reflectors

• Grant number: 97/13253-0
• Support Opportunities: Research Grants - Innovative Research in Small Business - PIPE
• Start date: June 01, 1998
• End date: May 31, 2003
• Field of knowledge: Engineering - Electrical Engineering - Telecommunications
• Principal Investigator: Alexandre Nunes da Trindade
• Grantee: Alexandre Nunes da Trindade
• Company: Proqualit Telecon Ltda

Abstract

The present project consists of the complete specification of a low noise level amplifier with frequency converters in KU Band (satellite television) Low Noise Block (LNB) for the features currently used on the national market by the operating companies of the DTH (Direct to Home) system: Sky (Globo Group) and TVA (Abril Group). Thereafter, a theoretical project should be developed that will attempt to solve the problem of the balance between the specified impedance for the minimum noise level and maximum gain in high frequency (12 GHz) and for the variations in the environment temperature (-10°C to 50°C). Once the theoretical electrical project is defined, in accordance with the diagram of the blocks to follow, a mechanical project enclosing the box and attaching the reflector should be carried out. Diagram of blocks of LNB: Zin 1 = Zin 2; Zout 1 = Zout 2; O.L. = Local Oscillator, and LNA = Low Noise Level Amplifier. The next step will be the mounting of the components, thus obtaining the first prototype of this printed circuit plate made in the country. Shortly afterwards, tests must be carried out on the performance of the mounted PCP (Printed Circuit Plate). After the evaluation of the performance, possible modifications to the PCP will be made, which must be integrated with the container box and the reflector for new performance tests. The final evaluation must be carried out on the whole assembly: parabolic reflector + LNB + receptor. The conclusions to this project should indicate the best solution for the mass production of this product. This study could also generate important procedures for projects on frequency converters to be applied in other telecommunications systems. (AU)