Phase shifters are microwave devices which have many applications in communications, radar systems and microwave. Phase shifters are used to change the transmission phase angle. When an electromagnetic wave of a given frequency is propagating through a transmission line, it can be shifted by using phase shifter device. It has many other applications in various equipment such as phase array antennas, power dividers, beam forming networks etc. Schiffman phase shifter is a three- port network and the main principle is that the phase difference between coupled or folded section, related to straight section, would provide a nearly flat 90 degree phase difference. The network is designed to perform for a wide band frequency range. In order to achieve a large bandwidth it is essential to have a tight coupling. A power divider is needed which can split the power into two equal parts with roughly phase shift. Common requirements of power dividers are wide operational band, low insertion loss, high directivity, high return loss and good impedance matching. The goal of this research is to design a microstrip phase shifter based on Schiffman method incorporating load and source impedance matching with the targeted frequency of about 1.5 GHz for a wide range of bandwidth.
July 27, 2016
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