In this paper we analyze various structures of branch line coupler with different frequencies of 1GHz to 2.5GHz. Couplers are used for splitting or combining power. It is basically a 3dB power divider or combiner with symmetrical four port network for obtaining 900 phase difference between its output.It has been used in many applications such as in mixers, power amplifiers, modulators, anteena beam forming networks.The major advantages of branch line coupler are low profile, easy to fabricate, light weight.

The objective is to design a compact branch line coupler to operate at a 2.4GHz frequency. The branch line coupler focuses on -3dB power division with 900 phase difference. T-shaped structure is used to construct the compact branch line coupler. Conventional branch line coupler is also designed and counterfeit using ADS software along with the compact branch line coupler for comparison. The S-parameters for the both coupler are counterfeit and compared. The simulation results of compact branch line coupler had Better return loss, isolation, amplitude and phase difference are all accomplished. Using the proposed method 44% size reduction is achieved. Many microwave applications and integrated circuits, such as amplifier, phase shifters and balanced mixers use branch line couplers.