@inproceedings{8a53bba1aaea4f89a3a0daa70df83db8,
title = "Wide piezoelectric tuning of LTCC bandpass filters",
abstract = "The increasing number of frequency bands and services in wireless communications is causing a demand for analogue active and passive frontend components with wide bandwidth or tuning range, respectively. Similar to microelectromechanical systems (MEMS), this work presents a parallel plate capacitor with multilayer dielectrics and piezoelectrically movable top electrode as an advantageous tunable element with no addition of any lossy material. When applied as a shunt capacitor in a coupled microstrip-line LTCC bandpass filter, the center frequency of the filter is tuned from 1.1 GHz to 2. 6 GHz with 200 V control voltage and low insertion loss of 2 to 4 dB. The analysis of the device by full-wave simulation reveals a potential tuning range from 0.8 GHz to 2.8 GHz when the thin-film processability of the LTCC surface is properly controlled.",
keywords = "Bonding, Ceramics, Piezoelectric materials, Tunable filter, Varactors",
author = "Mahmoud Al-Ahmad and Ruth Maenner and Richard Matz and Peter Russer",
year = "2005",
doi = "10.1109/MWSYM.2005.1516910",
language = "English",
isbn = "0780388461",
series = "IEEE MTT-S International Microwave Symposium Digest",
pages = "1275--1278",
booktitle = "2005 IEEE MTT-S International Microwave Symposium Digest",
note = "2005 IEEE MTT-S International Microwave Symposium ; Conference date: 12-06-2005 Through 17-06-2005",
}