Patent ID: 7321341

Claim:
A broadband antenna with a constant radiation pattern, comprising: a first plurality of antenna elements with each antenna element in the first plurality of antenna elements being rigid and having a different length from other antenna elements in the first plurality of antenna elements, with a first longest-antenna element in the first plurality of antenna element having a length longer than other antenna elements in the first plurality of antenna elements, with the first longest-antenna element having a first trap at a specific location of the first longest-antenna element in the first plurality of antenna elements, with common ends of the first plurality of antenna elements shaped to a first common point; a first transversal-wire ring for connecting a common end of each antenna element of the first plurality of antenna elements, for forming a first conical shape of a cylindrical antenna; a second plurality of antenna elements with each antenna element in the second plurality of antenna elements being rigid and having a different length from other antenna elements in the second plurality of antenna elements, with a second longest-antenna element in the second plurality of antenna elements having a length longer than other antenna elements in the second plurality of antenna elements, with the second longest-antenna element having a second trap at a specific location of the second longest-antenna element in the second plurality of antenna elements; a second transversal-wire ring for connecting a common end of each antenna element of the second plurality of antenna elements, for forming a second conical shape of a cylindrical antenna, with common ends of the second plurality of antenna elements shaped to a second common point, and an insulator for rigidly connecting the second common point of the second plurality of antenna elements with the first common pont of the first plurality of antenna elements, thereby forming a rigid dipole having the second conical shape of the cylindrical antenna, at the second common point, opposite to the first conical shape of the cylindrical antenna, at the first common pont.