Electronically Tunable Reflection Type Phase Shifters

This brief presents a low loss reflection-type phase shifter (RTPS) using a single varactor diode as the load. A parallel combination of an open-circuited stub and a varactor loaded stub are used at the load terminal. This arrangement greatly improves the response of the phase shifter. A transmission line based analysis shows real part of the load plays an important role on both phase variation and insertion loss. Based on the analysis, design guidelines are provided for controlling maximum insertion loss of the phase shifter. A prototype phase shifter is fabricated at 10 GHz. Measurement results of the RTPS show a relative phase variation of 190° with a maximum insertion loss of 2 dB when varactor capacitance is varied over 0.1 pF–0.2 pF. Moreover, the return loss is always better than 20 dB over the entire tuning range of the RTPS.

[1]  Robert A. York,et al.  Distributed analog phase shifters with low insertion loss , 1999 .

[2]  J. I. Upshur,et al.  Low-loss 360 degrees X-band analog phase shifter , 1990, IEEE International Digest on Microwave Symposium.

[3]  C. C. Tripathi,et al.  Design of compact reconfigurable switched line microstrip phase shifters for phased array antenna , 2012, 2012 1st International Conference on Emerging Technology Trends in Electronics, Communication & Networking.

[4]  Guan-Leng Tan,et al.  RF MEMS phase shifters: design and applications , 2002 .

[5]  Tae-Whan Yoo,et al.  360° reflection-type analogue phase shifter implemented with a single 90° branch-line coupler , 1997 .

[6]  Shao Yong Zheng,et al.  A Wideband Tunable Reflection-Type Phase Shifter With Wide Relative Phase Shift , 2017, IEEE Transactions on Circuits and Systems II: Express Briefs.

[7]  Boram An,et al.  Wideband Tunable Phase Shifter With Low In-Band Phase Deviation Using Coupled Line , 2018, IEEE Microwave and Wireless Components Letters.

[8]  Tso-Wei Li,et al.  A Millimeter-Wave Fully Integrated Passive Reflection-Type Phase Shifter With Transformer-Based Multi-Resonance Loads for 360° Phase Shifting , 2018, IEEE Transactions on Circuits and Systems I: Regular Papers.

[9]  Moon-Que Lee,et al.  Design of compact broadband phase shifter with constant loss variation , 2014 .

[10]  Philippe Ferrari,et al.  $X$ -Band Reflection-Type Phase Shifters Using Coupled-Line Couplers on Single-Layer RF PCB , 2018, IEEE Microwave and Wireless Components Letters.

[11]  G. D. Lynes,et al.  Design of a Broad-Band 4-Bit Loaded Switched-Line Phase Shifter , 1974 .

[12]  Philippe Ferrari,et al.  Tapered distributed analogue tunable phase shifter with low insertion and return loss , 2005 .