CLASSIFICATION OF ROTATIONALLY SYMMETRICAL ANTENNAS AS TYPES BOR(0) AND BOR(1)

Several antennas are bodies of revolution (BORs), e.g. conical-horn an tennas and biconical antennas. This note proposes to classify such ant ennas as types BOR(0) and BOR(1), depending on whether the polar compo nents of the radiation field have zeroth- or first-order phi variation s around the symmetry axis of the BOR. The BOR(0) antennas can be exci ted by axially located and axially oriented electric or magnetic monop oles or dipoles. The BOR(1) antennas can be excited by axially located and transversely oriented short electric or magnetic dipoles. The not e describes the general characteristics of BOR(0) and BOR(1) antennas, and gives results for how well long half-wave dipoles can excite BOR( 1) antennas.