Single feed passive antenna for a metal back cover

An electronic device comprising:

• radio frequency (RF) circuitry comprising a first RF feed, a second RF feed, and a third RF feed;
• a metal cover disposed on a non-display side of the electronic device, the metal cover comprising:
• a first strip element disposed at a periphery of the metal cover on a first axis;
• a second strip element disposed at the periphery of the metal cover on the first axis and adjacent to the first strip element;
• a first cutout in the metal cover that physically separates the first strip element from other portions of the metal cover;
• and
• a second cutout in the metal cover that physically separates the second strip element from other portions of the metal cover;
• an antenna structure comprising:
• the first strip element;
• the second strip element;
• a first connector coupled to the first strip element at a first feed point at a first location on the first strip element;
• a second connector coupled to the first strip element at a second feed point at a second location on the first strip element;
• a third connector coupled to the first strip element at a third feed point at a third location on the first strip element;
• a fourth connector coupled to the second strip element at a fourth feed point at a fourth location on the second strip element;
• a fifth connector coupled to the second strip element at a fifth feed point at a fifth location on the second strip element;
• and
• a sixth connector coupled to the second strip element at a sixth feed point at a sixth location on the second strip element;
• first multi-connector switching circuitry comprising:
• a first input node coupled to the first RF feed;
• a second input node coupled to the second RF feed;
• a third input node coupled to the third RF feed;
• a first output node coupled to the first connector;
• a second output node coupled to the second connector;
• a third output node coupled to the third connector;
• and
• a first configurable pre-matching circuit coupled between ground and the third output node, the first configurable pre-matching circuit to change an impedance of the first strip element between a first impedance value in a first configuration and a second impedance value in a second configuration;
• and
• second multi-connector switching circuitry comprising:
• a first input node coupled to the first RF feed;
• a second input node coupled to the second RF feed;
• a third input node coupled to the third RF feed;
• a first output node coupled to the fourth connector;
• a second output node coupled to the fifth connector;
• a third output node coupled to the sixth connector;
• and
• a second configurable pre-matching circuit coupled between ground and the third output node of the second multi-connector switching circuitry, the second configurable pre-matching circuit to change an impedance of the second strip element between the first impedance value in the first configuration and the second impedance value in the second configuration.