Hybrid Acoustic-LC Filter Packaging for Wideband Sharp Roll-Off
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Solution Overview
Problem
Current filters for microwave frequencies in mobile and wireless communication devices face challenges in achieving broad frequency bandwidth and sharp roll-off, leading to inefficient utilization of frequency spectrum and poor signal integrity, particularly in multi-radio platforms.
Innovation Solution
The development of hybrid filters that combine acoustic wave resonators and lumped component resonators with transformers, utilizing a transformer-based core and multiple parallel acoustic wave resonators to enhance out-of-band rejection and bandwidth, while reducing parasitics and component count.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If acoustic wave resonators are used, then sharp roll-off at passband edge is achieved, but broadband frequency bandwidth is limited
Solution Approach 1:
The patent combines acoustic wave resonators (providing sharp roll-off) with lumped component resonators (providing broadband response) into a hybrid filter architecture. This merging allows the filter to simultaneously achieve the sharp frequency selectivity of acoustic resonators and the broad bandwidth of lumped components, resolving the contradiction between roll-off sharpness and frequency bandwidth.
2Adaptability or versatility
If lumped element filters are used, then broad passband frequency range is achieved, but very slow roll-off results in poor selectivity
Solution Approach 1:
The hybrid filter merges lumped element resonators (providing broad passband) with acoustic wave resonators (providing sharp roll-off). The lumped components establish the broad frequency response while the acoustic resonators provide the steep frequency selectivity at the band edges, simultaneously achieving both broad passband and fast roll-off characteristics.
3Manufacturing precision
If traditional acoustic wave filter architectures are used, then sharp roll-off is achieved, but component count and parasitics increase
Solution Approach 1:
The filter architecture segments the frequency control function between different resonator types: acoustic wave resonators handle the critical band-edge frequency selectivity where sharp roll-off is needed, while lumped component resonators handle the broad passband transmission. This segmentation allows each component type to be optimized for its specific function, reducing the total component count while maintaining high frequency selectivity.
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 hybrid filters achieve wide bandwidth and sharp roll-off, enabling efficient signal rejection and coexistence of multiple frequency channels, thereby improving signal integrity and frequency spectrum utilization in next-generation communication devices.
Implementation Method 1
acoustic wave resonators (AWRs)...exhibit sharp roll-offs at the passband edge
Implementation Method 2
transformer based resonator...transformer having a first winding and a second winding
Data Source
AI summary
Hybrid filters and more particularly filters having acoustic wave resonators (AWRs) and lumped component (LC) resonators and packages therefor are described. In an example, a packaged filter includes a package substrate, the package substrate having a first side and a second side, the second side opposite the first side. A first acoustic wave resonator (AWR) device is coupled to the package substrate, the first AWR device comprising a resonator. A plurality of inductors is in the package substrate.