Patent ID: 7209096
Filing Date: 2007-04-24
Classification: H01Q

Abstract:
1. A low-visibility, field-diverse dual band monopole antenna for providing communications comprising: an antenna-supporting core comprising printed circuit board (PCB) substrate and having a width and a length; an antenna, said antenna wrapped upon said core in a manner for two selected dual band resonant frequencies, said antenna radiating in a diverse manner with horizontal and vertical field components of a field radiated by said antenna substantially in phase and not circularly polarized; said antenna including a two-pole low-pass filter that enables operation at said two selected resonant frequencies, said two-pole low-pass filter including three passive components that enable operation at said two selected resonant frequencies; and said three passive components including: the low-visibility, field-diverse dual band antenna is realized having helical antenna characteristics without severe circular polarization radiation thereby promoting reliable communications.