Novel microwave balanced bandpass filter with high common mode rejection ratio and wide rejection band under common mode operation

ABSTRACT

In this work, a new balanced band pass filter and its design procedure are proposed. The filter is based on a novel resonator, named LTLC resonator, which consists of two inductors (L), two Transmission Lines (TLs) and one capacitor (C_s). The resonators are designed by using its equivalent circuits and its design equations which are presented in this work. The filter exhibits central frequency at f_0d= 0.988 GHz, Fractional Band Width (FBW) of 10.1%, Common Mode Rejection Ratio (CMRR) better than 51 dB at the center frequency, Common Mode (CM) rejection better than −40 dB from 0.5 GHz to 3.3f_0d and better than −30 dB from 0.5 GHz to 4f_0d. This paper includes analysis, design methodology and experiments.

KEYWORDS:

• Balanced filter
• common-mode (CM) suppression
• coupled-resonators
• differential filter

Disclosure statement

No potential conflict of interest was reported by the authors.

Additional information

Notes on contributors

Jose-Luis Olvera-Cervantes

Jose-Luis Olvera-Cervantes received the B.Sc. degree from the Instituto Politécnico Nacional (IPN), Mexico City, Mexico, in 2001, and the M.Sc. and Ph.D. degrees from the Centro de Investigación Científica y de Educación Superior de Ensenada (CICESE), Baja California, Mexico, in 2005 and 2008, respectively. He is currently a researcher in the Electronics Department at the Instituto Nacional de Astrofisica, Óptica y Electrónica (INAOE-Mexico).

Alonso Corona-Chavez

Alonso Corona-Chavez, received the PhD. degree in electrical engineering from the University of Birmingham (UK) in 2001. From 2001 to 2004 he was with Cryosystems (UK) as a Microwave Engineer. Since 2004 he is a researcher at the Instituto Nacional de Astrofisica, Óptica y Electrónica (INAOE-Mexico). He has been a visiting professor at the University of California at Los Angeles, USA (2010), Queens University, Canada (2014) and the University of Guanajuato, Mexico (2016).

Tejinder Kaur

Tejinder Kaur, received the B.S. degree in electronics engineering from Punjab Technical University in 2003; the M.S. degree in electronic engineering in 2007 and the PhD in electrical engineering in 2011, from Instituto Nacional de Astrofisica, Óptica y Electrónica (INAOE-Mexico).

Miguel-Antonio Romero-Ramirez

Miguel-Antonio Romero-Ramirez was born in Hermosillo, Sonora, Mexico, in 1992. He received the B.S. degree in electronic engineering from the University of Sonora, in 2016 and the M.Sc. degree from the Electronics Department at the Instituto Nacional de Astrofisica, Óptica y Electrónica (INAOE-Mexico), in 2018. He is currently pursuing the Ph.D. degree electronics science at Instituto Nacional de Astrofisica, Óptica y Electrónica (INAOE-Mexico).