Methods for radio wave based health monitoring that involve engaging alignment features of a health monitoring device and an alignment element

1. A method for monitoring a health parameter in a person, the method comprising:

engaging an alignment feature of a health monitoring device with an alignment feature of an alignment element that is worn on the skin of a person;

transmitting radio waves from at least one transmit antenna of the health monitoring device below the skin surface of the person while the alignment feature of the health monitoring device is engaged with the alignment feature of the alignment element that is worn by the person;

receiving radio waves on a two-dimensional array of receive antennas of the health monitoring device while the alignment feature of the health monitoring device is engaged with the alignment feature of the alignment element that is worn by the person, the received radio waves including a reflected portion of the transmitted radio waves;

generating digital data that corresponds to the received radio waves;

determining a value that is indicative of a health parameter of the person in response to the digital data;

wherein the alignment element that is worn on the skin of the person comprises an alignment window, the method comprising an initial step of attaching the alignment element to the skin of the person such that a blood vessel of the person is visible through the alignment window upon attachment to the skin; and

wherein engaging the alignment feature of the health monitoring device with the alignment feature of the alignment element that is attached to the skin of the person causes the two-dimensional array of receive antennas to be positioned directly over the alignment window and thus directly over the blood vessel of the person that is wearing the alignment element.

2. The method of claim 1 , wherein the alignment feature of the health monitoring device and the alignment feature of the alignment element that is worn by the person comprise magnetic elements.

3. The method of claim 1 , wherein the alignment feature of the health monitoring device and the alignment feature of the alignment element that is worn by the person comprise corresponding magnetic elements that are connected to the health monitoring device and to the alignment element worn by the person in locations that match each other when brought together.

4. The method of claim 1 , wherein the alignment feature of the health monitoring device and the alignment feature of the alignment element that is worn by the person comprise magnets that become physically attached to each other by magnetic attraction when brought together.

5. The method of claim 1 , wherein the alignment feature of the health monitoring device and the alignment feature of the alignment element that is worn by the person comprise corresponding out-of-plane physical elements.

6. The method of claim 1 , wherein the alignment feature of the health monitoring device and the alignment feature of the alignment element that is worn by the person comprise physical elements that are configured to mate with each other when brought together.

7. The method of claim 1 , wherein the alignment element that is worn by the person is a skin patch and wherein engaging an alignment feature of a health monitoring device with an alignment feature of the skin patch comprises bringing the health monitoring device into close proximity to the skin patch to engage the alignment features.

8. The method of claim 1 , wherein engaging an alignment feature of a health monitoring device with an alignment feature of an alignment element that is worn on the skin of a person causes at least one of the at least one transmit antenna and the two-dimensional array of receive antennas to align with a vein of the person that is wearing the alignment element.