Abstract: A self-similar log-periodic antenna is described comprising a plurality of substantially triangular conductive elements, 4, symmetrically disposed in either planar or curved configurations about a central conductive boom to form an antenna arm. Two or more antenna arms are assembled into an antenna by symmetrically locating such antenna arms substantially in the shape of a pyramid (for planar arms) or in a conical shape (for curved arms). Some embodiments include a conductive fin, 5, to reduce cross-polarization coupling between antenna arms. Some embodiments include a grounded conductive shield on the interior of the antenna providing electromagnetic shielding for the interior region of the antenna while preserving the self-similar geometry of the antenna and shield combination.

Abstract: A self-similar log-periodic antenna is described having a substantially frequency independent range of operation. An antenna arm is described comprising a plurality of substantially triangular conductive elements, 4, symmetrically disposed about a central conductive boom. Adjacent triangular elements differ by a constant scale factor from a largest element to a smallest element wherein the largest and smallest elements relate to the bandwidth of the antenna. Both planar and curved antenna arms are described. Other embodiments of the antenna arms include a conductive fin, 5, located along the boom and having a shape so as to preserve the self-similarity of the arm. The conductive fin is shown to reduce cross-polarization coupling when the antenna arms are assembled into an antenna. Two or more such antenna arms are assembled into an antenna by symmetrically locating such antenna arms in the shape of a pyramid (for planar arms) or in a conical shape (for curved arms).

Abstract: A self-similar log-periodic antenna is described comprising a plurality of substantially triangular conductive elements, 4, symmetrically disposed in either planar or curved configurations about a central conductive boom to form an antenna arm. Two or more antenna arms are assembled into an antenna by symmetrically locating such antenna arms substantially in the shape of a pyramid (for planar arms) or in a conical shape (for curved arms). Some embodiments include a conductive fin, 5, to reduce cross-polarization coupling between antenna arms. Some embodiments include a grounded conductive shield on the interior of the antenna providing electromagnetic shielding for the interior region of the antenna while preserving the self-similar geometry of the antenna and shield combination.