The Uncertainty Principle in Quantum Mechanics

The main entities that we use in quantum field theory to describe our universe are fields. We have longer particles and we understand particles as excitations of these fields. Because the energy of each of these tiny quantum mechanical pendulum, you know, is a finite number, is this zero point energy? And because the field is a collection of a nifty number of this pendula, if you do the calculation it comes out to be infinite.