Stylus antenna

A computer stylus comprising:

• a shaft having a metal tube;
• a printed circuit board in the shaft and including ground traces;
• an antenna having an antenna resonating element on the printed circuit board and aligned with a window in the metal tube;
• a first conductive screw that couples the metal tube to the ground traces at a first side of the window;
• a second conductive screw that couples the metal tube to the ground traces at a second side of the window opposite the first side of the window;
• a cap configured to slide relative to the metal tube between an open position and a closed position;
• and
• a metal hook coupled to the cap and that extends from the cap into the metal tube, wherein
• the metal hook is electrically coupled to the ground traces through the metal tube and the first and second conductive screws while the cap is in the closed position, and
• the metal hook is electrically decoupled from the ground traces while the cap is in the open position.

A computer stylus comprising:

• a shaft having a dielectric bumper and a metal tube;
• a cap having a metal loop with an opening, wherein the metal loop extends into the metal tube, the dielectric bumper is disposed within the opening of the metal loop, and the metal loop is configured to slide relative to the dielectric bumper between an open position and a closed position;
• and
• an antenna resonating element in the shaft and overlapping a window in the metal tube, wherein
• the antenna resonating element is different from the metal loop,
• the metal loop being interposed between the antenna resonating element and the metal tube while the cap is in the closed position,
• the metal loop is electrically coupled to the metal tube while the cap is in the closed position, and
• the metal loop is electrically decoupled from the metal tube while the cap is in the open position.