On the mutual admittance between clavin elements

A slot straddled by two parasitic monopoles (Clavin element) is known to be capable of producing equal - and -plane patterns and thus offers the promise of lower mutual coupling than the slot alone. An analysis is presented which demonstrates that this promise is realized. A comparison with an experiment is offered, together with a procedure for designing linear and planar arrays of Clavin elements in the presence of mutual coupling. Such arrays have the advantage of very low far-out sidelobes in all cuts.