Noise-immune miniaturized antenna

A circuit board comprising:

• a ground plane;
• and
• an inverted-F antenna (IFA) structure located at an opening in the ground plane, the opening being located at a side of the ground plane, wherein the IFA structure comprises:
• a feed point located at a first edge of the ground plane opposite to the opening;
• a first grounding point located at a second edge of the ground plane adjacent to the opening;
• a second grounding point located at the first edge, the second grounding point being located farther away from the side than the feed point;
• a feed arm coupled to the feed point;
• a radiating arm coupled to the feed arm and the first grounding point;
• a shorting arm coupled to the radiating arm and the second grounding point;
• a first tuning component coupled to a distal end of the radiating arm and the first grounding point, wherein the first tuning component is configured to cause the IFA structure to radiate electromagnetic energy in a first frequency range;
• and
• a second tuning component coupled to a distal end of the shorting arm and the second grounding point, wherein the second tuning component is configured to cause the IFA structure to radiate electromagnetic energy in a second frequency range.

An electronic device comprising:

• a radio;
• a circuit board comprising a ground plane and an inverted-F antenna (IFA) structure located at an opening in the ground plane, the opening being located at a side of the ground plane, wherein the IFA structure comprises:
• a feed point coupled to the radio, wherein the feed point is located at a first edge of the ground plane opposite to the opening;
• a first grounding point located at a second edge of the ground plane adjacent to the opening;
• a second grounding point located at the first edge, the second grounding point being located farther away from the side than the feed point;
• a feed arm coupled to the feed point;
• a radiating arm coupled to the feed arm and the first grounding point;
• a shorting arm coupled to the radiating arm and the second grounding point;
• a first tuning component coupled to a distal end of the radiating arm and the first grounding point, wherein the first tuning component is configured to cause the IFA structure to radiate electromagnetic energy in a first frequency range;
• and
• a second tuning component coupled to a distal end of the shorting arm and the second grounding point, wherein the second tuning component is configured to cause the IFA structure to radiate electromagnetic energy in a second frequency range.