NDLI: Real-time temperature compensation for tunable cavity-based BPFs and BSFs

Content Provider	IET Digital Library
Author	Wu, Yu Chen Khater, Mohammad Abu Peroulis, Dimitrios
Abstract	In this study, a real-time temperature compensation control system for tunable high-Q cavity-based filters are designed, implemented, and experimentally validated. Both bandpass (BPFs) (700–1000 MHz) and bandstop filters (BSFs) (1300–1600 MHz) with high-Q ( Q ≃ 400 ) resonators are monitored in real time to compensate for any temperature variations. The monitoring scheme includes additional resonators that share the same tuning piezoelectric actuators with the resonators of the radio frequency (RF) filters. An oscillator is coupled with each monitoring resonator resulting in an output signal at a frequency directly linked to the RF resonance. Each monitoring resonator is controlled by a user-provided input through a closed-loop in real time. The presented system is capable of compensating for temperature variations in the − 40 and 80 ∘ C range. The average system resolution varies from 0.23 to 9 MHz, depending on temperature, with a 1 ms sensing period. The closed-loop frequency shift is 6.5 MHz (0.93%) and 8.75 MHz (0.65%) for the BPFs and BSFs, respectively, in the − 40 to 80 ∘ C temperature range. This is to be compared with the open-loop change of 256 MHz (36%) and 590 MHz (44%) for the same temperature change. The monitoring oscillator power leakage to the RF cavities is optimised and measured to −101 dBm.
Starting Page	785
Ending Page	791
Page Count	7
ISSN	1751858X
Volume Number	12
e-ISSN	17518598
Issue Number	Issue 6, Nov (2018)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-cds/12/6
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-cds.2018.0019
Journal	IET Circuits, Devices & Systems
Publisher Date	2018-04-12
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Band-pass Filter Band-stop Filter BPFs BSFs Frequency 0.23 MHz to 9.0 MHz Frequency 1300.0 MHz to 1600.0 MHz Frequency 256.0 MHz Frequency 590.0 MHz Frequency 6.5 MHz Frequency 700.0 MHz to 1000.0 MHz Frequency 8.75 MHz Microwave Filter Passive Filter Passive Network Piezoelectric Actuators Piezoelectric Device Q Cavity-based Filter Q Resonator Radio Link And Equipment Real-time Temperature Compensation Real-time Temperature Compensation Control System Resonator Filter RF Filter RF Resonance Temperature Control Time 1.0 Ms UHF Filter Waveguide And Microwave Transmission Line Component
Content Type	Text
Resource Type	Article
Subject	Control and Systems Engineering Electrical and Electronic Engineering

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3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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