Title :
Experimental Rotary Transformers For Antenna Power Supplies and Control [Antenna Designer´s Notebook]
Author :
Eskelinen, Pekka
Author_Institution :
Helsinki Univ. of Technol., Helsinki, Finland
Abstract :
Rotary transformers can be effectively used for low-noise amplifier (LNA) or down-converter power supply and control signal transmission in scanning-antenna applications. Three air-core designs, utilizing a square wave at audio frequencies, using HCMOS logic and giving a 5 V/0.6 A dc power feed, are discussed. The constructions allow further installation of RF rotary joints or other coaxial hardware up to a diameter of 100 mm. They add about 30 to 80 mm to the overall height of the antenna, depending on application and requirements. Bearing replacement with such a transformer is also possible, if adequate tolerances are met and suitable coil-support materials are selected.
Keywords :
antennas; low noise amplifiers; power supplies to apparatus; rotary convertors; transformers; antenna power control; antenna power supply; coaxial hardware; coil-support material; down-converter power supply; experimental rotary transformer; low noise amplifier; scanning-antenna application; signal transmission control; MATLAB; Power supplies; Transformers; Transmitting antennas; Rotary transformer; measurement radar; radar; radar power supply; radar scanner; rotary joint; transformers;
Journal_Title :
Antennas and Propagation Magazine, IEEE
DOI :
10.1109/MAP.2010.5687521
