Dr. Senad Bulja, PhD, FIET, SMIEEE

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Home » Researches » Novel wideband transition between coplanar waveguide and microstrip line

Novel wideband transition between coplanar waveguide and microstrip line

Dr. Senad Bulja 09/01/2023Download Here

The coplanar waveguide (CPW) and the microstrip line are the two most commonly used transmission lines in millimeter and sub-millimeter wave circuits since they are compact and easy to fabricate. The width of the ground conductors of the CPW is always finite in practice, in which case the structure is sometimes referred to as Finite Ground CPW (FGCPW). Highly integrated microwave circuits often comprise a combination of CPW and microstrip lines, thus requiring suitable low-loss interconnections (transitions) between these two lines. 

In this paper a novel wideband vertical transition for connecting the coplanar waveguide (CPW) to the microstrip line is proposed. This transition is very useful for millimeter-wave packaging and vertical interconnects. It is multilayered, partly tapered, and consists of only one via interconnect. Two different transitions are designed. The first transition allows connectivity of a CPW with Zc=50 Ω to a microstrip line with Zc=16 Ω with a bandwidth of 10–60 GHz. The second transition has the same characteristic impedance, Zc=50 Ω , at the two ports. In this case, the operating frequency is from 40 MHz to 60 GHz. The return losses of both transitions are generally lower than 10 dB over their indicated frequency ranges, while the maximum measured insertion losses are 1.8 and 2.4 dB for the first and second transition, respectively. To extract the S-parameters of the transitions, a new Thru-Line (TL) technique, based on the standard Thru-Reflect-Line (TRL) two-tier calibration is introduced. It is mathematically proven that the new TL technique yields identical results as the TRL technique, however it obviates the need for the Reflect standard as required by the TRL technique, resulting in a greater measurement accuracy as the number of potential sources of error is reduced. Simulation and experimental results, showing good agreement, are presented and discussed. 

Fig. 1 CPW to microstrip line transition; perspective view (left and top view (right)
Fig. 1 CPW to microstrip line transition; perspective view (left and top view (right)

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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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