Isolation among I/O ports

A method to adjust isolation among I/O ports, comprising:

• performing, by a die, a first radio frequency (RF) function via a first I/O port;
• tuning a variable capacitor electrically connected to a second I/O port to adjust isolation between the first I/O port and a third I/O port, the second I/O port located between the first I/O port and the third I/O port wherein the first, second, and third I/O ports are located along at least one geometric axis, and wherein the variable capacitor is not electrically connected to an antenna in a circuit board outside the die and electrically coupled to the die via at least one of the first, second, or third I/O ports;
• and
• performing, by the die, a second RF function via the third I/O port.

An apparatus with adjustable isolation among I/O ports, the apparatus comprising:

• a memory;
• at least one processor coupled to the memory;
• a first I/O port;
• a second I/O port;
• and
• a third I/O port, wherein the at least one processor is configured to, at least in part with the memory,
• perform a first RF function via the first I/O port;
• tune a variable capacitor to adjust isolation between the first I/O port and the third I/O port, the variable capacitor being electrically connected to the second I/O port, and the second I/O port located between the first I/O port and the third I/O port wherein the first, second, and third I/O ports are located along at least one geometric axis;
• and
• perform a second RF function via the third I/O port,
• wherein the variable capacitor is not electrically connected to an antenna in a circuit board outside the die and electrically coupled to the die via at least one of the first, second, or third I/O ports.