Control System for Piezoelectric-Actuator-Based Tunable Evanescent-Mode Cavity Microwave Filters

Shahrokh Saeedi, Sattar Atash-Bahar, Juseop Lee, Hjalti Sigmarsson

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)


A control system for automatic tuning of substrate-integrated, evanescent-mode cavity, microwave filters, with piezoelectric actuators, is developed. The system is based on an elegant sensing method using monitoring capacitors mounted on top of the actuators, where the digital value of them is directly measured. The system first requires us to characterize the resonators in the filter and then can automatically tune the filter without any extra instrument. Characterization is used to circumvent the hysteresis and creeping effects of the piezoelectric actuators. This procedure extracts a unique frequency-capacitance relationship, which is modeled using a quadratic polynomial and saved into the system for tuning. Polynomial coefficients, extracted from the characterization data, are utilized to implement a closed-loop feedback control algorithm for the standalone tuning operation. The capability of the control system in automatically tuning a variety of microwave filters using this methodology is experimentally demonstrated.

Original languageEnglish
Article number8487015
Pages (from-to)1979-1989
Number of pages11
JournalIEEE Transactions on Components, Packaging and Manufacturing Technology
Issue number11
Publication statusPublished - 2018 Nov

Bibliographical note

Funding Information:
Manuscript received October 19, 2017; revised March 29, 2018 and August 15, 2018; accepted September 26, 2018. Date of publication October 9, 2018; date of current version November 12, 2018. This work was supported by the Agency for Defense Development (ADD), Daejeon, Republic of Korea under Contract UD120046FD. Recommended for publication by Associate Editor T. Wu upon evaluation of reviewers’ comments. (Corresponding author: Shahrokh Saeedi.) S. Saeedi is with the Advanced Radar Research Center (ARRC), The University of Oklahoma, Norman, OK 73019 USA (e-mail: S. Atash-Bahar is with LivaNova PLC, Houston, TX 77058 USA.

Publisher Copyright:
© 2011-2012 IEEE.


  • Automatic tuning
  • Bandpass filters
  • Bandpass-bandstop cascade
  • Bandstop filters
  • Capacitive sensor
  • Evanescent-mode cavity
  • Feedback control
  • Tunable

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Industrial and Manufacturing Engineering
  • Electrical and Electronic Engineering


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