High isolation antenna system

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;
• a counterpoise;
• a first antenna port and a second antenna port, each port defined by a first feed terminal located on the counterpoise and a second 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, the first antenna port, and the second antenna port are configured such that a signal within the given operating frequency band applied to the first antenna port is isolated from the second antenna port
• wherein the resonant antenna section is positioned at an asymmetric location with respect to the counterpoise so that a first natural frequency response from the first feed terminal differs from a second natural frequency response of the second feed terminal.