A simple technique for the design of MMIC 90/spl deg/ phase-difference networks

In this paper, a simple technique for the design of broadband 90/spl deg/ phase-difference networks, using balanced and unbalanced all-pass network topologies, is presented. In the developed method, the element values of the structures are calculated as function of two design variables: Q/sub 0/ and r. Utilizing this approach, a 90/spl deg/ phase shifter has been realized, having less than 2/spl deg/ phase error and better than 0.5 dB amplitude error in the operating band from 0.7 to 3.5 GHz.