This work presents the design and simulation of a zinc oxide based thin film bulk acoustic resonator (TFBAR) bandpass filter for 2.6 GHz band applications. Third and fifth-order filters in ladder topology are designed and compared. The third-order filter has an insertion loss of 1.62 dB and return loss of 18.97 dB with a bandwidth of 80 MHz whereas the fifth-order filter has insertion loss, return loss, and bandwidth of 2.85 dB, 25.28 dB, and 60 MHz, respectively. With a central frequency of 2.67 GHz, the designed filter has applications in the 2.6 GHz (2500-2690 MHz) band, which has been identified by the International Telecommunication Union as a global frequency band for mobile broadband services. © 2016 IETE.

Atul Vir Singh

Electrical Engineering

(SoE) School of Engineering

Sonal Singhal

Madhur Deo Upadhayay

Dutta J.

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Shiv Nadar University

Design and Simulation of a Zinc Oxide Thin Film Bulk Acoustic Resonator Filter for 2.6 GHz Band Applications

IETE Journal of Research

The present work focusses on the design and simulation of a thin film bulk acoustic resonator (TFBAR) and a polyimide based TFBAR (PI-TFBAR) and compares the radio frequency (RF) bandpass filter response designed from these resonators. The Polyimide layer in the PI-TFBAR acts as an acoustic wave reflector along with providing mechanical strength to the device. The designed third order bandpass filter has a ladder topology. The insertion loss of the TFBAR filter is 1.69 dB and the return loss is 39.60 dB whereas the insertion loss and return loss are 1.71 and 23.7 dB respectively for the PI-TFBAR filter. The bandwidth of the TFBAR filter is 68.0 MHz and for PI-TFBAR it is 25 MHz. The proposed filter designs, with further optimization, may have application in the 2.6 GHz band, which has been identified by the International Telecommunication Union as a global band for International Mobile Telecommunications and is one of the core bands of LTE-Advanced technology. © 2017, Springer-Verlag Berlin Heidelberg.

Microsystem Technologies

A comparative study on the design and simulation of TFBAR and polyimide-TFBAR based RF bandpass filters

International Journal of RF and Microwave Computer-Aided Engineering

A general procedure for the design of bulk acoustic wave filters

Advanced Materials Research

Design, Fabrication and Characterization of ZnO Based Thin Film Bulk Acoustic Resonators

Electronics Letters

Generalised Butterworth-Van Dyke equivalent circuit for thin-film bulk acoustic resonator

Ladder-lattice bulk acoustic wave filters: Concepts, design, and implementation

Analog Integrated Circuits and Signal Processing

Method for improving ladder bulk acoustic wave filters rejection