Dr. Senad Bulja, PhD, FIET, SMIEEE

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Home » Researches » Compact coaxial filters for BTS applications

Compact coaxial filters for BTS applications

Dr. Senad Bulja 04/01/2023Download Here

 

Filters are essential to virtually all communication systems. Even though the fundamental principles of the operation of filters have been known since the second part of the 20th century, practical filter design still draws a great deal of attention from RF engineers and academia. Such is the significance of filters.

In this paper, a new class of coaxial cavity filters with low-profile suitable for base transceiver station applications is proposed. The individual resonator is in the form of two hollow cylinders, with the cylinder of a small radius inserted into a bigger one. This disposition leads to volume reduction, high performance, and superior spurious-free response. In addition, the paper also provides details on the equivalent lumped element circuit which allows for a fast and efficient initial design of the resonators. However, just like in the case of all resonators, full-wave optimization is required to produce the final and optimized configuration of the filters. As an experimental verification, we have designed, simulated and fabricated a five-pole filter operating at a centre frequency of 722 MHz. The measured results demonstrate high performance, consistent with the simulated results. The electrical length of the experimental resonators is as low as λ0/16 . The measured insertion loss of the five-pole filter is 0.92 dB at 722 MHz. Experimental results show a spurious-free response of the order of 7.6 times.

Fig. 1 Photograph of the prototyped 5-pole filter
Fig. 1 Photograph of the prototyped 5-pole filter

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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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