Design of balanced band pass filters with one transmission zero using an asynchronously coupled dual-mode resonator

Abstract

A novel quasi-elliptic balanced bandpass filter (BBPF) designed on microstrip technology that uses Asynchronously Coupled Dual-Mode Resonator (ACDMR) is proposed. The filter is based on a novel Balanced Asynchronous Box (Basybox), which has five couplings and three resonators (two λ/2 resonators and a dual-mode grounded λ/2 resonator). By changing a conventional triplet with the use of dual-mode resonators, we can generate a non-resonant mode that generates a transmission zero (TZ). In addition, the filter has a balanced response. In this paper, full design methodology is presented along with a practical implementation. The filter has a center frequency in differential-mode of 950 MHz, a bandwidth of 53 MHz and a transmission zero at 975 MHz. For the common-mode, there is a rejection higher than 15 dB throughout the band up to 3 GHz. Good agreement between simulation and measurement is observed.

KEYWORDS:

• Balanced filters
• non-resonating mode
• asynchronously coupled dual- mode resonator
• microstrip technology

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Notes on contributors

Miguel-Antonio Romero-Ramirez

Miguel-Antonio Romero-Ramirez obtained his B.Sc. in electronics engineering from Universidad de Sonora, Mexico in 2016, and the M.S. and Ph.D. degrees in electronic engineering from Instituto Nacional de Astrofisica, Optica y Electrónica, Mexico, in 2018 and 2022, respectively. From 2022 he is with INTEL Corporation, Mexico as a signal integrity engineer.

Tejinder Kaur Kataria

Tejinder Kaur Kataria received a B.S. degree in electronics engineering from Punjab Technical University, India, in 2003, and the M.S. and Ph.D. degrees in electronics engineering from Instituto Nacional de Astrofisica, Optica y Electrónica, Mexico, in 2007 and 2011, respectively. From 2011 to 2013, she was a lecturer at Universidad de las Américas Puebla, Cholula, Mexico. In 2015, she was a postdoc scholar at Instituto Nacional de Astrofisica, Optica y Electrónica, Mexico. From 2016 to 2021, she was a professor with Universidad de Guanajuato, Salamanca, Mexico. In 2021, she joined Universidad Autonoma de la Ciudad de Mexico, Mexico City, Mexico.

Jose-Luis Olvera-Cervantes

Jose-Luis Olvera-Cervantes received his B.Sc. degree from Instituto Politécnico Nacional, Mexico City, Mexico, in 2001, and his M.Sc. and Ph.D. degrees from Centro de Investigación Científica y de Educación Superior de Ensenada, Ensenada, Mexico, in 2005 and 2008, respectively. In 2009, he joined Instituto Nacional de Astrofísica, Óptica y Electrónica, where he is currently a full professor. His research interests include microwave sensors, radar systems, dielectric characterization, food properties, and signal processing.

Alonso Corona-Chavez

Alonso Corona-Chavez received a B.Sc. degree in electronics engineering from ITESM, Mexico, and a Ph.D. degree from the University of Birmingham, U.K., in 2001. From 2001 to 2004, he was a microwave engineer with CryoSystems Ltd., U.K., where he developed superconducting front ends for the telecommunications industry. Moreover, he was an honorary research fellow with the electrical engineering department, University of Birmingham (2001–2004). In September 2004, he joined INAOE, where he is currently a professor in the electronics department. In April 2009, he was awarded a Fulbright Fellowship to carry out research with the electrical engineering department, University of California at Los Angeles. He was a visiting professor and an adjunct professor with the University of Queens, Canada, in 2014, and a professor with Universidad de Guanajuato (2015–2016). He is a member of the National Systems for Researchers (SNI).