Tunable dual-band filters based on capacitive-loaded stepped-impedance resonators

Girbau, David; Lázaro, Antonio; Pérez, Antoni Roca; Martinez, E Ortega; Pradell, L.; Villarino, R.

doi:10.23919/eumc.2009.5296212

Cited by 10 publications

(2 citation statements)

References 10 publications

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“…al momento de implementar el filtro. (Shaman, 2007), (Pérez-Escribano, 2018), (Girbau, 2009) Una de las técnicas de RF más populares para el diseño de filtros es la técnica de interferencia de señales, que consiste en usar líneas microstrip, ya que, estas tienen algunas de sus líneas de campo en la región dieléctrica entre el conductor de la línea y el plano de tierra, y otra fracción de campo en la región de aire por encima del sustrato. (Gómez-García, 2005), (Xu, 2010), (Ketkuntod, 2015) Por esta razón, en el presente artículo se estudia el uso de líneas microstrip (MTLs.)…”

Section: Introductionunclassified

Diseño e Implementación de un Filtro Multibanda de 2 secciones para Comunicaciones Móviles con Líneas de Transmisión y Stubs en Abierto

Gualli Santos

2024

Ciencia Latina

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En el presente artículo se propone el diseño y fabricación de un filtro multibanda de 2 secciones de banda ancha. Al cual se le da una aplicación en frecuencias de comunicaciones móviles. El diseño del filtro se basa en una configuración de circuito de secciones de líneas de transmisión en cascada para una f1=2,4 GHz y para un f2=3.5 GHz, un ancho de banda de 27% y 74% respectivamente y una atenuación de -40 dB en las bandas de rechazo. Para la caracterización del filtro y su implementación se utilizó el software de simulación y los resultados se midieron con el equipo analizador de redes vectoriales “KEYSIGHT E5071C ENA Series Network Analyzer”. (ESPOCH).

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Section: Introductionunclassified

Diseño e Implementación de un Filtro Multibanda de 2 secciones para Comunicaciones Móviles con Líneas de Transmisión y Stubs en Abierto

Gualli Santos

2024

Ciencia Latina

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“…Concretely and related to this work, many RF and microwave applications need compact filters with low losses and multi-band operation without increasing the area dedicated to frequency selective devices. Traditionally, microstrip filters have been used in different topologies, like step-impedance resonators [4], interdigital capacitors [5], or a combination of both [6]. In recent years, several alternatives have arisen in the literature, proposing different technologies to create multi-band responses, including filters based on Acoustic-Wave-Lumped-Element-Resonators [7] or split-type filters [8].…”

Section: Introductionmentioning

confidence: 99%

Analytical Design of Compact Multiband Bandpass Filters with Multiconductor Transmission Lines and Shunt Open Stubs

2023

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A compact topology for implementing compact multiband bandpass filters is presented in this paper. To achieve the desired frequency response, two identical short-circuited multiconductor transmission lines (MTLs) and properly connected shunt open stubs are interconnected. Using this configuration, it is possible to design multiband bandpass filters effortlessly. As both the MTLs and the stubs are distributed elements, spur-line band-stop filters are added to mitigate the first replica of the structure’s frequency response. To assess the behavior of the developed filter design procedure, a prototype consisting of a six fingers-MTL and two shunt open stubs has been designed, manufactured, and analyzed, showing excellent agreement between analytical and measured results, considering that no simulation or optimization process has been performed during the design process, just for result verification. Furthermore, it is possible to establish a design criterion that allows the fast and reliable synthesis of multiband responses by varying just a small number of geometrical parameters of the MTLs and the corresponding stubs.

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A highly selective tri‐band bandpass‐to‐bandstop filter with the third band independently tunable

Yang

Zhang

et al. 2021

Engineering Reports

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A highly selective tri-band bandpass (BP)-to-bandstop (BS) filter with the third tunable band and the other two fixed ones is proposed in this article. This filter is based on a novel crossed resonator that is composed of a two-end-open UIR with an open stub and a short stub connected in parallel on both sides of the resonator center. A PIN diode is utilized to achieve BP-to-BS switchable characteristics. Then, varactor diodes loaded at the open stub are employed to obtain the independently tunable third band. In addition, due to the symmetry of the resonator structure, the even-and odd-mode analysis method is used to derive the resonant frequencies. For validation, a tri-band BP-to-BS filter operating at 2.4 GHz (WLAN), 3.3 GHz (WiMAX), and 4.9 GHz (LAA/LTE-U) is designed, manufactured, and measured that achieves the continuous frequency tuning range (FTR) of the third band from 4.52 to 4.90 GHz with return loss (RL) better than 10.05 dB under the BP characteristic, from 4.55 to 4.90 GHz with the rejection level (RL) higher than 15.53 dB under the BS characteristic. The measured results agree well with the simulated ones.

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Tunable dual-band filters based on capacitive-loaded stepped-impedance resonators

Cited by 10 publications

References 10 publications

Diseño e Implementación de un Filtro Multibanda de 2 secciones para Comunicaciones Móviles con Líneas de Transmisión y Stubs en Abierto

Diseño e Implementación de un Filtro Multibanda de 2 secciones para Comunicaciones Móviles con Líneas de Transmisión y Stubs en Abierto

Analytical Design of Compact Multiband Bandpass Filters with Multiconductor Transmission Lines and Shunt Open Stubs

A highly selective tri‐band bandpass‐to‐bandstop filter with the third band independently tunable

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