Dual-Mode SAW Resonator Layout for Compact Receiver Filters
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Solution Overview
Problem
Dual-mode SAW resonators used in receiver filters face limitations in miniaturization due to the spacing between series resonators, hindering integration into monolithic microwave integrated circuits.
Innovation Solution
A dual-mode surface acoustic wave (SAW) resonator design featuring a first and second resonator connected in series, with a signal metal pattern and ground metal pattern connected via a single insulating film, allowing for reduced spacing between the resonators.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
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If a dual-mode SAW resonator uses two series resonators with conventional spacing, then the resonators can be properly isolated and function correctly, but the size of the receiver filter cannot be minimized
Solution Approach 1:
The patent merges the ground connections of the first and second resonators by forming a common ground electrode that electrically connects both resonators. This consolidation of ground paths allows the resonators to be positioned closer together while maintaining proper electrical isolation and function, thereby reducing the overall size of the receiver filter assembly.
Solution Approach 2:
The patent transitions from planar spacing between resonators to three-dimensional electrode configuration by forming ground electrodes that extend beneath the resonators and connect through conductive layers. This vertical integration allows closer horizontal positioning of resonators while maintaining electrical isolation through the layered structure.
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If the spacing between series resonators is reduced to minimize filter size, then miniaturization is achieved, but the electrical isolation and proper functioning of resonators may be compromised
Solution Approach 1:
The patent segments the ground connection system into distinct conductive layers and regions. The first and second resonators each have dedicated ground connection paths that are separated in the vertical dimension through different conductive layers, allowing close horizontal spacing while maintaining electrical isolation through the layered segmentation.
Solution Approach 2:
The patent introduces conductive layers and insulating layers as intermediary elements between the resonators. These intermediary layers provide controlled electrical connections and isolation, enabling the resonators to be positioned closer together while maintaining proper electrical boundaries and preventing unwanted coupling.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The design minimizes the size of the receiver filter, enabling miniaturization and facilitating integration into monolithic microwave integrated circuits.
Implementation Method 1
a single insulating film configured to insulate the signal metal pattern from the ground metal pattern
Implementation Method 2
a first resonator and a second resonator, each being comprised of a plurality of interdigital transducer (IDT) elements
Data Source
AI summary
A dual-mode SAW resonator constituting a receiver filter according to the present invention includes a first resonator and a second resonator, each being comprised of a plurality of interdigital transducer (IDT) elements; a signal metal pattern connecting signal terminals formed on the plurality of IDT elements; a ground metal pattern connecting ground terminals formed on the above plurality of IDT elements; and a single insulating film configured to insulate the signal metal pattern from the ground metal pattern, wherein the first resonator and the second resonator are connected in series.