“…The next step is the establishment of the relationship between the physical structure and the coupling coefficient According to resonator coupling theory, the coupling coefficient can be determined by the formula below[4],: (8) Where K, is the resonant frequency when a open symmetric plane is added and K 2 is the resonant frequency when a short symmetric plane is added . [5] [6] The coupling coefficient extracted by HFSS using the method above is shown in Fig. 12.…”