%0 Journal Article 
%A Gómez Molina, Celia
%A Pons Abenza, Alejandro
%A Do, James
%A Quesada Pereira, Fernando Daniel
%A Liu, Xiaoguang
%A Gómez Díaz, Juan Sebastián
%A Álvarez Melcón , Alejandro
%T Wideband bandpass filters using a novel thick metallization technology
%D 2020
%@ 2169-3536
%U http://hdl.handle.net/10317/12977
%X A new class of wideband bandpass filters based on using thick metallic bars as microwave
resonators is presented in this work. These bars provide a series of advantages over fully planar printed
technologies, including higher coupling levels between resonators, higher unloaded quality factors QU ,
and larger bandwidths implemented with compact structures. In comparison to dielectric and waveguide
resonators filters, higher bandwidths together with lower weight and footprint reduction are achieved with
the proposed thick bars technology. Moreover, thick bar resonators can easily be coupled to an additional
resonance excited in a box used for shielding, allowing to realize transversal topologies able to implement
transmission zeros at desired frequencies. To illustrate the capabilities of this technology, three microwave
filters with different topologies have been designed. One of the designed filters has been manufactured and
tested using copper bars inside an aluminum housing partially filled with Teflon. Measured data demonstrates
a fractional bandwidth of FBW = 32%, spurious free range SFR > 50%, unloaded quality factor of
QU = 1180, insertion losses over 0.16 dB and return losses over 20 dB, without requiring any post-tuning
operation on the prototype. This result confirms the exciting performance of the proposed technology for
wideband applications.
%K Teoría de la Señal y las Comunicaciones
%K Hybrid waveguide microstrip technology
%K microwave  filters
%K resonator filters
%K transmission zeros
%K transversal filters
%K wideband filters
%K 3325.04 Enlaces de Microondas
%~ GOEDOC, SUB GOETTINGEN