Accession Number : AD0450431


Title :   AN ANTENNA ARRAY FOR RADAR ASTRONOMY STUDIES IN THE 20 TO 55 MC RANGE,


Corporate Author : STANFORD UNIV CA STANFORD ELECTRONICS LABS


Personal Author(s) : Howard, H T


Report Date : 15 Aug 1964


Pagination or Media Count : 20


Abstract : The discipline of radar astronomy requires antennas capable of handling large peak and average powers over a wide frequency range, while providing both high directive gain and enough steerability to illuminate targets for extended periods of time. This report discusses the design and construction of a branch-fed, variablephase, 20-60 mc array of 48 log-periodic elements. Phasing to control beam direction is described and the correction necessary for ionospheric refraction is presented in terms of vertical incidence critical frequency. The array gain as measured by moon bounce techniques is found to be in good agreement with the theoretical value. (Author)


Descriptors :   *RADAR ANTENNAS , ASTRONOMY , CONSTRUCTION , PHASED ARRAYS , MOON , LUNAR ENVIRONMENTS , GASES , SOLAR CORONA , LOG PERIODIC ANTENNAS , IONOSPHERE , REFRACTION , POWER , CIRCUITS


Distribution Statement : APPROVED FOR PUBLIC RELEASE