Patent ID: 7817103

Claim:
A dual band multi-pitch helical antenna for a portable handheld radio comprising: a first section positioned adjacent an antenna feed point of the portable handheld radio having a widely spaced pitch; a second section attached to the first section having a narrowly spaced pitch; a third section attached to the second section having a widely spaced pitch; a fourth section attached to the third section having a narrowly spaced pitch; at least one parasitic element positioned adjacent to each of the first section, the second section, the third section, and the fourth section; a matching network connected between the antenna feed point of the portable handheld radio and the first section for matching the dual band multi-pitch helical antenna to a predetermined feed point impedance; and wherein the antenna is resonant in at least two frequency bands, and further wherein the antenna generates a radiation pattern covering a majority of directions in a horizontal plane of the antenna and upward from the portable handheld radio.