Receive-Side Acoustic Wave Filter Topology for Isolation Control

The filter is segmented into multiple functional sections: a first plurality of acoustic wave resonators for basic filtering, a second plurality of acoustic wave resonators for harmonic rejection, and a compensation resonator for isolation enhancement. Each section addresses specific performance requirements independently, allowing optimization of isolation performance without requiring complete redesign of the entire filter structure.

The compensation resonator acts as an intermediary element that specifically targets and corrects the overlapping reflection coefficient issue. By introducing this intermediate component with carefully selected characteristics, the patent achieves improved isolation performance without directly modifying the core filtering sections, thus maintaining overall system stability while resolving the specific contradiction.

Different sections of the filter are assigned different qualities and functions: the first plurality of resonators handles fundamental frequency filtering, the second plurality addresses harmonic rejection, and the compensation resonator provides localized isolation improvement. This local differentiation allows each component to be optimized for its specific function, achieving precise frequency band management with minimal overall complexity.

Rather than designing a single complex resonator structure to handle all requirements, the patent applies partial action by using multiple simpler resonator types with specific numbers and configurations. The second plurality of resonators is specifically added to address harmonic rejection without redesigning the entire filter, providing the necessary frequency band management through targeted additional components.