Simple antennas Available to Purchase

Describes the increasing need for simple and efficient antennas and looks at the performance of quarter wavelength and helical antennas. Concludes the optimum performances from both antennas are ruled by the choice of a suitable ground plane. The helical antenna is capable of producing a circularly polarized field, whereas the quarter wavelength antenna produces only linearly polarized fields. Both types exhibit low efficiency, with the helical antenna being less efficient owing to its short structure.