CP Antenna Research Articles

Circular polarisation selective surface characterisation and advanced applications

The characterisation of a wire antenna array which exhibits circular polarisation selectivity, known as a circularly polarised selective surface (CPSS), is presented. This structure reflects one hand of circular polarisation while simultaneously transmitting the opposite hand of circular polarisation. The authors present an optimally spaced CPSS array and provide the first comprehensive experimental quantification of its transmission, reflection and axial ratio properties for a variety of angles of incidence in the X-band frequency range. In addition, the monostatic radar cross-section (MRCS) response for the structure is also presented. Application of the CPSS array, as a phase shifter-less beam-steering device and also as a means for reducing CP antenna sensitivity to ground plane proximity, as well as its use as a polarisation converter, are also discussed.

A New CP Antenna for Television Broadcast Service

Current interest in circular polarization for TV broadcasting has increased to such proportions that many broadcasters are planning new facilities, anticipating its adoption. The VHF high-band and low-band cavity-backed radiator antenna described in this paper is part of a development program aimed at meeting those requirements.