Current students


CAICEDO MEJILLONES STEVEN KLEBERCycle: XXXIV

Section: Telecommunications
Advisor: D'AMICO MICHELE
Tutor: RIVA CARLO GIUSEPPE

Major Research topic:
Synthesis of Filters and Filtering Antennas for Micro and Millimeter Waves Applications

Abstract:
This research is focused on developing novel methods to synthesize and design filters and filtering antennas.

One the one hand, with the advent of different 5G solutions and the massive deployment of IoT, the need for highly selective filters also arises. With size as a constraint in many applications (e.g., Phased Array Antennas for FDD applications), the introduction of several finite transmission zeros may be necessary. This conversely often leads to intricate topologies and therefore more complicated implementation and tuning. Extracted-pole and cascaded-blocks are modular topologies that can overcome all these issues, allowing to design even fully canonical filters. Along these lines, one part of the research is focused on the development of new filter synthesis techniques that are more precise, completely analytical and that extend the features of what is in the state of the art.

On the other hand, the integration of filtering functions in the antenna is also part of my research, focused on the following scenarios:
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  • Phased Array Antenna (PAA) for Frequency Division Duplexing (FDD) backhaul equipment: One of the main challenges to face for the inclusion of a PAA (to provide beam steering capabilities) in an FDD system is the isolation between transmitter and receiver. Two separate antenna arrays are considered to be used to isolate the transmission and reception channel, however, even in this case, a filter is still necessary just before the antenna to meet the required isolation. Therefore, a Filtenna (Filter + Antenna) will be the base radiation element on the PAA.
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  • Enhanced Electromagnetic Compatibility on Satellites: Coexistence of wireless data links and radio sensing instruments onboard scientific satellites are big challenges concerning electromagnetic compatibility. Integration of filtering functions into the downlink antenna could offer a space-effective way to improve isolation by suppressing out-of-band emissions.
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Based on the research focus, my results so far are:
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  • Three novel analytical filter synthesis methods which allows to synthesize extracted-pole filters, cascaded-doublet filters and cascaded n-tuplets filters including non-resonant nodes. These methods exceed those available in the literature, allowing the analytical synthesis of novel topologies. Because all of them are coupling matrix synthesis-based they are more accurate and less time-consuming compared with the section extraction and numerical optimization methods.
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  • A lossy filter synthesis-based design of an all-pole third-order PCB Filtenna that is compact and can be the base radiation element of a Phased Array Antenna. Due to compactness and if all base elements are fed independently, beam steering in two dimensions are possible.
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  • A filter synthesis-based design of a fully canonical third-order PCB Filtenna that can be the base radiation element of a Phased Array Antenna for one-dimension beam steering.
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  • A filter synthesis-based design of a fully canonical two-order Coaxial Horn Filtenna for enhanced electromagnetic compatibility aboard scientific satellites. 
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