Related Experiment Video
Updated: Jun 17, 2026
15:25
Design and Characterization Methodology for Efficient Wide Range Tunable MEMS Filters
Published on: February 4, 2018
Bulk acoustic wave filters synthesis and optimization for multi-standard communication terminals
Sylvain Giraud1, Stéphane Bila, Matthieu Chatras
1XLIM Unite Mixte de Recherche 6172, Universite de Limoges/Centre National de la Recherche Scientifique, 87060 Limoges Cedex, France. sylvain.giraud@xlim.fr
IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
|December 31, 2009
Summary
This study introduces a design methodology for bulk acoustic wave (BAW) filters, crucial for mobile telecommunications. The research details filter synthesis and applies the design to specific mobile frequency bands using innovative materials.
Area of Science:
- Electrical Engineering
- Materials Science
- Physics
Background:
- Bulk Acoustic Wave (BAW) filters are essential components in modern wireless communication systems.
- Understanding BAW physical principles and filter synthesis is key to designing efficient devices.
- The modified Butterworth-van Dyke model provides a framework for analyzing BAW resonator behavior.
Purpose of the Study:
- To present a comprehensive design methodology for Bulk Acoustic Wave (BAW) filters.
- To apply and validate the methodology on specific filter designs for mobile telecommunication bands.
- To explore the impact of electrode materials on BAW filter performance.
Main Methods:
- Overview of BAW physical principles and filter synthesis techniques.
- Application of the modified Butterworth-van Dyke model for resonator analysis.
- Design and optimization of BAW bandpass filters for UMTS and DCS1800 TX-bands.
Main Results:
- Successful application of the design methodology to mixed ladder-lattice and ladder/lattice BAW bandpass filters.
- Demonstration of BAW filters based on AlN resonators for specific mobile frequency bands.
- Comparison of filter performance using conventional molybdenum and innovative iridium electrodes.
Conclusions:
- The presented design methodology is effective for developing BAW filters for telecommunication applications.
- AlN resonators are suitable for BAW filter fabrication in target frequency bands.
- Iridium electrodes offer a promising alternative for enhanced BAW filter performance.
Related Concept Videos
01:23Design Example
The innovation of touch-tone telephony revolutionized the telecommunications industry by replacing the traditional rotary dial with a dual-tone multi-frequency (DTMF) signaling system. This system uses a matrix-style keypad with buttons arranged in four rows and three columns, creating 12 distinct signals each assigned to a pair of frequencies. Each button press results in a simultaneous generation of two sinusoidal tones – one from a low-frequency group (697 to 941 Hz) and one from a...
01:25Active Filters
Active filters are electronic circuits that use operational amplifiers (op-amps), resistors, and capacitors to filter out unwanted frequency components from a signal. A first-order low-pass active filter is designed to pass signals with a frequency lower than a certain cutoff frequency and attenuate frequencies higher than that cutoff frequency. The transfer function for a first-order low-pass active filter is:
01:27Passive Filters
Passive filters are utilized to shape the frequency spectrum of signals across a diverse array of applications. These filters, using only passive elements like resistors (R), inductors (L), and capacitors (C), are capable of selectively allowing or blocking certain frequency ranges without the need for external power sources.
Low-Pass Filters
Low-pass filters are designed to transmit signals with frequencies lower than the cutoff frequency, ωc, and attenuate those above it. The cutoff frequency...
Low-Pass Filters
Low-pass filters are designed to transmit signals with frequencies lower than the cutoff frequency, ωc, and attenuate those above it. The cutoff frequency...
01:10Wave Parameters
The simplest mechanical waves are associated with simple harmonic motion and repeat themselves for several cycles. These simple harmonic waves can be modeled using a combination of sine and cosine functions. Consider a simplified surface water wave that moves across the water's surface. Unlike complex ocean waves, in surface water waves, water moves vertically, oscillating up and down, whereas the disturbance of the wave moves horizontally through the medium. If a seagull is floating on the...
01:23Parallel Resonance
The parallel RLC circuit is an arrangement where the resistor (R), inductor (L), and capacitor (C) are all connected to the same nodes and, as a result, share the same voltage across them. The parallel RLC circuit is analyzed in terms of admittance (Y), which reflects the ease with which current can flow. The admittance is given by:
01:18Aliasing
Accurate signal sampling and reconstruction are crucial in various signal-processing applications. A time-domain signal's spectrum can be revealed using its Fourier transform. When this signal is sampled at a specific frequency, it results in multiple scaled replicas of the original spectrum in the frequency domain. The spacing of these replicas is determined by the sampling frequency.
If the sampling frequency is below the Nyquist rate, these replicas overlap, preventing the original signal...
If the sampling frequency is below the Nyquist rate, these replicas overlap, preventing the original signal...