Fig. 1 Four-port network
Design Process: The equations above will become more complicated to be solved as the number of load ports increases. So, a parameter sweep method is presented to find these solutions quickly, easy to apply in engineering. A simple metal housing with a clearance 1mm (06) is a size of 42mm*38mm as an example in Fig.2. Cp (04) and Lp (03) connected to PCB ground (05) are lumped elements to decouple of Port1(01) and Port2(02), operating in the WiFi-2.4G. The material of metal rim and PCB is copper.