A wireless communication apparatus includes an analog receiving unit, a phase calculator, a time variation calculator, and a chirp radar determination unit. The debt trending device may then analyze the account information in order to generate debt trending information that indicates in the form of lists, tables, graphs, charts, etc. The parasitic load limits the voltage of the fuel cell stack and induces the electrochemical consumption of the first and second reactants remaining in the stack during shutdown. A plurality of second rivet sections are disposed on at least one of the enhancing ribs of the frame and the insulative housings and a plurality of second mounting holes are defined in at least one of the insulative housings and the enhancing ribs to receive the rivet sections.