Circularly polarised printed tilted beam antenna

Abstract

A cavity‐backed printed crank‐line array antenna is presented as an inverted microstrip line structure for producing high gain circularly polarised (CP) tilted beam. The crank‐line antenna element, in travelling wave condition, is fed with a printed Z‐feed and terminated at the other end with a vertical open‐ended printed stub. Single element exhibits an impedance bandwidth of 20% (3.6–4.4 GHz) for a VSWR<2. A beam tilt of 35° with CP gain around 7.8 dBic is measured for an axial ratio of 2 dB at 4 GHz. A cavity‐backed printed crank‐line array with a tilted beam is formed by connecting two open crank‐line radiation elements. The measured gain of the array is around 10.5 dBic across the operating frequency for an axial ratio <3 dB. A beam tilt of 46° is achieved.