Crossed-field-antennas

Crossed-field-antennas (CFAs) are novel antenna systems which are structurally small (can be typically < lambda /100 in size), wide bandwidth and efficient radiators. Constructed prototypes which are also good receivers, have been successful in the MF, HF and VHF ranges. Basically, the CFA stimulates E and H fields to be in precise time-synchronism close to the antenna structure and hence provides a source of intense power radiation from a small compact volume. Since time-synchronism is controlled outwith or independently from the antenna structure, then the requirement of a specific antenna structure size to achieve radiated power is not a critical feature and hence small size CFAs can be constructed. The authors discuss the phasing unit and impedance matching, input impedance and bandwidth, the effect of phase change between the E and H fields, and working voltages.