Electrical engineering

Physics

Band-pass filter

Topology (electrical circuits)

Bandwidth (computing)

Transversal (combinatorics)

Wideband

Mathematics

Resonator

Filter (signal processing)

Electronic filter

Distributed element filter

Engineering

Mathematical analysis

Voltage

m-derived filter

Prototype filter

Filter design

Acoustics

Electronic engineering

Computer science

Telecommunications

IEEE Transactions on Microwave Theory and Techniques

This work presents the complete synthesis procedure and circuit transformations needed to go from the characteristic polynomials to the transversal network formed by electroacoustic resonators. This filter topology allows the possibility to achieve any filter response in spite of limited electroacoustic coupling. This is crucial for obtaining very wideband filters with arbitrary positions of transmission zeros. Additional circuit transformations reveal the flexibility of such topology to control other important parameters of the acoustic filter such as the impedance of the resonators and their resonant frequencies, which directly affect the manufacturing process. The transversal topology for electroacoustic filters has been verified by the synthesis, design, fabrication, and measurement of a very wideband filter to meet the requirements of 5G N77 frequency band, centered at 3.75 GHz with 910 MHz of bandwidth.

Acoustic Wave Transversal Filter for 5G N77 Band