Log periodic microstrip array

Abstract

This paper represents the results of log periodic microstrip antenna design for octave frequency band 8-18 GHz. Such an antenna was invented by P.S. Hall (1986), the main advantages of this antenna are: good size-weight characteristics; ability of conformable mounting on curved surfaces; and relatively low cost and high reliability of parameters due to modern microwave printed circuit technology of manufacturing. The main technical requirements for antenna under design are: beamwidth of radiation pattern in azimuth plane 90 deg., in elevation plane 30 deg.; mainlobe direction due to the axis of cylindrical carrier 90 deg.; input VSWR 2-2.5 in frequency band 8-18 GHz; and antenna gain 9-10 dB. The electromagnetically coupled rectangular microstrip patch had been used as radiating element of array.