Sv. Biryukov et al., CONSISTENT GENERALIZATION OF COM EQUATIONS TO 3-DIMENSIONAL STRUCTURES AND THE THEORY OF THE SAW TRANSVERSELY COUPLED WAVE-GUIDE RESONATOR FILTER, IEEE transactions on ultrasonics, ferroelectrics, and frequency control, 42(4), 1995, pp. 612-618
An analytical theory for calculating the response of a transversely co
upled waveguide resonator filter (TCF) is derived consistently from th
e analytical model for the description of two-dimensional structures.
The COM equations for slowly varying amplitudes of the SAW electric po
tential as functions of the longitudinal coordinate are derived, The c
oefficients of these equations such as reflectivity, phase delay and t
ransduction coefficient are calculated for each mode. The theory conne
cts the material and geometrical parameters of the structure with the
characteristics of the TCF, The frequency dependence of the admittance
matrix and insertion loss for one and two cascaded filters are consid
ered. The splitting of the resonance peaks due to cascading is investi
gated. Good agreement between theoretical and experimental results is
found.