A quadrature branch-line hybrid directional coupler is designed to operate in the S band i.e. in the frequency range of 2GHz to 4GHz with a centre of 2.4GHz. Since, 3dB coupling is used the input power is equally divided between the through port and the coupled port with a 90 degree phase difference. Negligible power is supplied at isolated port. The various calculations regarding the coupler design are performed and the s-parameters of the two stage coupler is measured by simulation using the Advanced Designing System(ADS) software. The two stage coupler shows decent values of s-parameters over the frequency range of 1.2 GHz. At the end a comparative study is presented with reference to the single stage coupler on the basis of coupler parameters and performance and finally the conclusion completes our discussion.
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