Antenna switching scheme

A wireless device, comprising:

• a first antenna array comprising a first plurality of antennas;
• a second antenna array comprising a second plurality of antennas;
• a plurality of power amplifiers;
• a plurality of low-noise amplifiers;
• and
• a plurality of switching circuits, wherein each of the plurality of switching circuits comprises:
• a transformer including a first inductor, a second inductor, and a third inductor, wherein the first inductor is coupled to a respective one of the plurality of power amplifiers, a first terminal of the second inductor is coupled to a respective one of the first plurality of antennas, a second terminal of the second inductor is coupled to a respective one of the second plurality of antennas, and the third inductor is coupled to a respective one of the plurality of low-noise amplifiers;
• a first switch coupled between the first terminal of the second inductor and a ground;
• and
• a second switch coupled between the second terminal of the second inductor and the ground.

An apparatus, comprising:

• a transformer including a first inductor, a second inductor, a third inductor, and a fourth inductor;
• a power amplifier coupled to the first inductor;
• a low-noise amplifier coupled to the second inductor
• a first antenna coupled to a first terminal of the third inductor;
• a first switch coupled between a second terminal of the third inductor and a ground;
• a second antenna coupled to a first terminal of the fourth inductor;
• and
• a second switch coupled between a second terminal of the fourth inductor and the ground.

A wireless device, comprising:

• a first antenna array comprising a first plurality of antennas;
• a second antenna array comprising a second plurality of antennas;
• a plurality of power amplifiers;
• a plurality of low-noise amplifiers;
• and
• a plurality of switching circuits, wherein each of the plurality of switching circuits comprises:
• a transformer including a first inductor, a second inductor, a third inductor, and a fourth inductor, wherein the first inductor is coupled to a respective one of the plurality of power amplifiers, the second inductor is coupled to a respective one of the plurality of low-noise amplifiers, a first terminal of the third inductor is coupled to a respective one of the first plurality of antennas, and a first terminal of the fourth inductor is coupled to a respective one of the second plurality of antennas;
• a first switch coupled between a second terminal of the third inductor and a ground;
• and
• a second switch coupled between a second terminal of the fourth inductor and the ground.