UWB 90° phase shifter based on broadside coupler and T-shaped stub

An UWB 90° phase shifter based on broadside coupler and T-shaped stub is proposed. Its operation mechanism is explained by the equivalent circuit. The measured results exhibit that the bandwidth is 126.7% with phase deviation within ±6°, and the insertion loss is <1.8 dB over the frequency band from 2.2 to 9.8 GHz. Comparison shows that the proposed design not only achieves the widest bandwidth, but also has low insertion loss and small phase difference. This design is a good candidate for UWB applications due to its low cost, planar structure, and convenient installation.

[1]  Shao Yong Zheng,et al.  Broadband Phase Shifter Using Loaded Transmission Line , 2010, IEEE Microwave and Wireless Components Letters.

[2]  B. M. Schiffman,et al.  A New Class of Broad-Band Microwave 90-Degree Phase Shifters , 1958 .

[4]  R. Lech,et al.  Simulation and Experiment of a Compact Wideband 90$^{\circ}$ Differential Phase Shifter , 2012, IEEE Transactions on Microwave Theory and Techniques.

[5]  A. Abbosh,et al.  Phase Shifters With Wide Range of Phase and Ultra-Wideband Performance Using Stub-Loaded Coupled Structure , 2014, IEEE Microwave and Wireless Components Letters.

[6]  M. Salazar-Palma,et al.  Design and Testing of a Single-Layer Microstrip Ultrawideband 90° Differential Phase Shifter , 2013, IEEE Microwave and Wireless Components Letters.

[7]  M.E. Bialkowski,et al.  Design of Compact Directional Couplers for UWB Applications , 2007, IEEE Transactions on Microwave Theory and Techniques.

[8]  Sai Ho Yeung,et al.  A Multisection Phase Correcting Network for Broadband Quadrature Power Splitter Design , 2013, IEEE Microwave and Wireless Components Letters.