Description This book gives the fundamental principles and device design techniques for surface acoustic wave filters. It covers the devices in widespread
use today: bandpass and pulse compression filters, correlators and non-linear convolvers and resonators. The newest technologies for
low bandpass filters are fully covered such as unidirectional transducers, resonators in impedance element filters, resonators in double-mode
surface acoustic wave filters and transverse-coupled resonators using waveguides.
The book covers the theory of acoustic wave physics,
the piezoelectric effect, electrostatics at a surface, effective permittivity, piezoelectric SAW excitation and reception, and the SAW
element factor. These are the main requirements for developing quasi-static theory, which gives a basis for the non-reflective transducers
in transversal bandpass filters and interdigital pulse compression filters. It is also needed for the reflective transducers used in
the newer devices.
Audience
R&D electrical and electronic engineers developing electronic systems (with applications mainly in mobile communications, radar and broadcasting)
using surface acoustic wave devices; academic researchers; graduate level electrical and electronic engineering students.
Contents Preface
Foreword
Prefaces and Forewords to previous books (1985, 1991)
1. Basic Survey
1.1. Acoustic waves
in solids
1.2. Propagation effects and materials
1.3. Basic Properties of interdigital transducers
1.4. Apodization and transversal
filtering
1.5. Correlation and signal processing
1.6. Wireless interrogation - sensors and tags
1.7. Resonators and low-loss filters
1.8. Summary of devices and applications
2. Acoustic waves in elastic solids
2.1. Elasticity in anisotropic materials
2.2. Waves in isotropic materials
2.3. Waves in anisotropic materials
3. Electrical excitation at a plane surface
3.1. Electrostatic case
3.2. Piezoelectric half-space
3.3. Some properties of the effective permittivity
3.4. Green's function
3.5. Other applications of the effective permittivity
4. Propagation effects and materials
4.1. Diffraction and
beam steering
4.2. Propagation loss and non-linear effects
4.3. Temperature effects and velocity errors
4.4. Materials for surface-wave
devices
5. Non-reflective transducers
5.1. Analysis for a general array of electrodes
5.2. Quasi-static analysis
of transducers
5.3. Summary and P-matrix formulation
5.4. Transducers with regular electrodes - element factor
5.5. Admittance of
uniform transducers
5.6. Two-transducer devices
6. Bandpass filtering using non-reflective transducers
6.1. Basic
properties of uniform transducers
6.2. Apodised transducer as a transversal filter
6.3. Design of transversal filters
6.4. Filter
design and performance
7. Correlators for pulse compression radar and communications
7.1. Pulse compression radar
7.2. Chirp waveforms
7.3. Interdigital chirp transducers and filters
7.4. Reflective array compressors 7.5. Doppler effects and
spectral analysis
7.6. Correlation in spread-spectrum communications
8. Reflective gratings and transducers
8.1.
Reflective array method for gratings and transducers
8.2. Coupling-of-modes (COM) equations
8.3. Numerical evaluation of COM parameters
9. Unidirectional transducers and their application to bandpass filtering
9.1. General considerations
9.2. DART mechanism and analysis
9.3. Bandpass filtering using DART's
9.4. Other SPUDT structures and analysis for parameters
9.5. Other SPUDT filters
9.6. Other low-loss techniques
10. Waveguides and transversely-coupled resonator (TCR)
filters
10.1. Basic strip waveguides
10.2. Waveguide modes in interdigital devices
10.3. Analysis for general waveguides
10.4. Transversely-coupled resonator (TCR) filter
10.5. Unbound waveguide modes
10.6. Waveguides including electrode reflectivity
11. Resonators and resonator filters
11.1. Resonator types
11.2. Surface-wave oscillators
11.3. Impedance element
filters using resonators
11.4. Leaky waves
11.5. Longitudinally-coupled resonator (LCR) filters`
Appendix A. Fourier transforms
and linear filters
A.1. Fourier transforms
A.2. Linear filters
A.3. Matched filtering
A.4. Non-uniform sampling
A.5. Some
properties of bandpass waveforms
A.6. Hilbert transforms
Appendix B. Reciprocity
B.1. General relation for a mechanically
free surface
B.2. Reciprocity for two-terminal transducers
B.3. Symmetry of the Green's function
B.4. Reciprocity for surface excitation
of a half-space
B.5. Reciprocity for surface-wave transducers
B.6. Surface wave generation
Appendix C. Elemental charge density
for regular electrodes
C.1. Some properties of Legendre functions
C.2. Elemental charge density
C.3. Net charges on electrodes
Appendix D. P-matrix relations
D.1. General relations
D.2. Cascading formulae
Appendix E. Electrical loading
in an array of regular electrodes
E.1. General solution for low frequencies
E.2. Propagation outside the stop band
E.3. Stop
bands
E.4. Theory of the multistrip coupler
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