COAXIAL-LINE TO WAVEGUIDE TRANSITION FOR HORN ANTENNA
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Abstract
THE INVENTION RELATES TO AN ANTENNA ASSEMBLY FOR MICROWAVE USAGE WHICH IS CHARACTERIZED BY A COAXIAL-LINE TO WAVEGUIDE TRANSITION. THE ANTENNA INCLUDES A RECTANGULAR WAVEGUIDE SECTION, A SECTORAL HORN, AND A TRANSFORMER FOR PROVIDING IMPEDANCE MATCHING BETWEEN THE WAVEGUIDE AND THE HORN. THE TRANSITION IS ACCOMPLISHED BY FEEDING TO THE END OF THE WAVEGUIDE AN E-PLANE LOOP, I.E., A LOOP PARALLEL TO THE ELECTRIC FIELD PLANE IN THE WAVEGUIDE. THE END FEEDING OF THE WAVEGUIDE RESULTS IN A MINIMUM VERTICAL DIMENSION OF THE OVERALL DEVICE WHEN THE COAXIAL LINE IS ATTACHED. THE SMALL VERTICAL DIMENSION IS DESIRABLE IN ORDER TO PERMIT STACKING OF A REQUIRED NUMBER OF ANTENNAS IN AN ARRAY HAVING LIMITED SPACE REQUIREMENTS BETWEEN ASSEMBLY INPUTS. THE INVENTION ALSO FEATURES A WIDE BAND RESPONSE.
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