Abstract
The object of the project is to design, simulate and fabricate a broadband microstrip balun operating at a center frequency of 5 GHz and wide bandwidth of 3.5 GHz. In this project report, I present one design with the capacitor in the middle of coupled lines and the resistor at the input port. This balun design will find various applications in the wireless industry such as push-pull configuration and mixers. The Advanced Design System (ADS) software was used to design and simulate the model. This design is aimed to provide a coupling of –17 dB at both output ports and a phase difference of 180 degrees between the two output ports over the specified frequency range, and give low voltage standing wave ratio (VSWR) while maintaining good amplitude balance. The emphasis is to obtain a high degree of amplitude balance, phase balance and low VSWR, and keep in tune with high performance demanded by wireless systems.