Patent ID: 8937578
Filing Date: 2015-01-20
Classification: H01Q

Abstract:
1. An antenna system supporting a common resonance mode and differential resonance mode, each with approximately equal radiation resistance and bandwidth at a given operating frequency band, the antenna system comprising: a resonant antenna section comprising two spaced-apart poles and a distributed network therebetween, each of said poles having a proximal end connected to the distributed network and an opposite distal end, the distal ends of the poles being separated from each other by a distance of ⅓ to ⅔ of an electrical wavelength at the given operating frequency, wherein each of the poles is of different length, and wherein the distal ends of the poles are diametrically opposed from each other along the resonant antenna section; a counterpoise; two antenna ports, each defined by a pair of feed terminals with one feed terminal located on the counterpoise and another feed terminal located on a different one of the poles of the resonant antenna section; and inductive shorting sections connected between the resonant antenna section and the counterpoise, wherein the resonant antenna section is in a first planar section that is parallel to the counterpoise in a second planar section, and wherein the inductive shorting sections are in between and perpendicular to the first and second planar sections of the resonant antenna section and the counterpoise, respectively, wherein the resonant antenna section, counterpoise, and ports are configured such that a signal within the given operating frequency band applied to one port is isolated from an other port.