Filters for 5G mmWave

University essay from KTH/Skolan för elektroteknik och datavetenskap (EECS)

Author: Alberto Monje Real; [2019]

Keywords: ;

Abstract: Periodic structures are an emerging eld in nowadays's microwave designs.These structures have been proven to be capable of achieving compact, ecientsolutions to problems such as leakage, or surface waves. Moreover, they haveshown interesting properties in dierent microwave related areas, such as lensantenna design, and gap-waveguide technology. However, the application ofperiodic structures to lter design has not been extensively investigated yet.In this work, the designs of several ltering structures are carried out withthe aim of exploring the possibilities of the application of periodic surfaces tolter design. The ltering structures consist of passband lters at millimeterwave frequencies (28 GHz) for the fth generation (5G) technology, which alsomust suppress the harmonics at twice the passband frequency.The main contribution of this thesis is the introduction of a new form of geometrythat has proven to improve in a great factor the attenuation propertiesof traditional, state-of-the-art geometries.The complete design process is described, starting by the analysis of a unit cellusing the dispersion diagram, continuing by designing the lter, and nalizingwith the design of a tapering structure of a coaxial feed to the lter. Somenumerical techniques are explained for better understanding of the structuresand for accelerating the calculations. A design has been manufactured andmeasured to assess its performance, comparing it to the simulated results.

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