Dr. Senad Bulja, PhD, FIET, SMIEEE

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Home » Researches » A new structure for reflection-type phase shifter with phase control range

A new structure for reflection-type phase shifter with phase control range

Dr. Senad Bulja 15/02/2023Download Here

Phase shifters are omnipresent in telecommunications. They play an important role in radar, phased array and receiver systems. Reflective-type Phase Shifter (RTPS) circuits, with inherently well-impedance matched inputs/outputs are of particular interest for applications where high phase shift values, excellent performance and small size are of importance. 

 

A novel 360o reflection type phase shifter is proposed in this paper. It comprises a 3-dB coupler, resonant circuits, transistors and PIN diodes. The control of phase is enabled by controlling the capacitance of the varactor (transistor) and the switching behavior of the PIN diode.. The new structure provides a full 360o phase shift, and it is believed that it can be extended to phase shifts even beyond 360o. Equations are derived to precisely describe the behaviour of the reflective load, the range of obtainable phase shifts as well as the limitations imposed by such a structure. In one case it is shown that with a careful choice of the varactor the transmission losses can be kept to lower than 2.6 dB. Also, in another case the phase control range of 360o is obtained using a bipolar transistor with a capacitance ratio (Cmax/Cmin ) of only 1.28.

 

 

Fig1. Calculated FoM of RTPS with series resonant circuitat 2.5 GHz.
Fig1. Calculated FoM of RTPS with series resonant circuit at 2.5 GHz.

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Profile & Bio

Senad Bulja, Ph.D., FIET, SMIEEE 

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PROFESSIONAL Profile

  • Accomplished career of over 19 years demonstrating consistent success as a Researcher, Leader and Mentor in the Wireless industry research environment.
  • Excellent Scientific contributions in the field of RF, EMC and telecommunications with 4 Nature Journal publications and over 70 peer-reviewed articles and conference papers
  • Strong leadership skills demonstrated by leading Ph.D. level educated cross-continental and cross-departmental teams to successful project execution.  
  • Proven Strategic Business Impact – introduced own developed technology into Nokia’s future technology roadmap (RF filters) and business transfer of the smart surface technology. 
  • Creative, internationally awarded and well-driven inventor with over 70 filed patents in the area of hardware for Radio Frequency (RF), Wireless Sensor Networks (WSN), Internet of Things (IoT) and wireless systems architectures. E.g. Nokia patent award entitled: “A top inventor in implementation patent first filings”, 2020.
  • Significant contribution in the identification of high revenue IP assets and leadership on the creation of Nokia’s patent portfolio roadmap. 
 

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