And that's exactly what it is: a RF Power Combiner simply combines (sum) different signals in a single output. In the above case, the signals are transmitted over port B and C go out through that output (A).
The body mass index (BMI) or Quetelet index is a value derived from the mass (weight) and height of an individual. The BMI is defined as the body mass divided by the square of the body height, and is universally expressed in units of kg/m 2, resulting from mass in kilograms and height in metres.
The BMI is used to determine peopleâs weight category and to identify those who may be at risk for certain health problems. 1  A normal BMI range is from 18.5 to 24.9. 2  A BMI less than 18.5 signals that a person is underweight.  Obesity may be diagnosed in people with a BMI greater than 30.