High-Frequency Module Layout to Protect Filter Characteristics
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Solution Overview
Problem
Existing high frequency modules experience deterioration in filter characteristics due to the magnetic field generated by the inductor, leading to performance issues.
Innovation Solution
A high frequency module design featuring a mounting substrate with a filter connected to an antenna terminal and an inductor, where the inductor is positioned adjacent to the first electronic component without overlapping the antenna end resonator, and includes a winding portion that does not overlap the antenna end resonator in a side view, thereby minimizing the magnetic field's impact on the filter.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the inductor is disposed close to the filter on the mounting substrate, then the device size is reduced and integration is improved, but the filter characteristics deteriorate due to magnetic field interference from the inductor
Solution Approach 1:
The patent applies dimensional separation by configuring the inductor and filter such that they do not overlap when viewed from the winding axis direction of the inductor. This spatial arrangement in three-dimensional space allows the components to be closely positioned on the substrate while preventing magnetic field interference, thus resolving the contradiction between compactness and performance
Solution Approach 2:
The patent applies local quality by making the substrate have different properties in different regions - specifically, the substrate has different permeability or magnetic shielding characteristics in the region where the inductor is disposed compared to other regions. This localized modification allows the inductor to be placed close to the filter while minimizing magnetic field interference with the filter characteristics
2Stability of the object's composition
If the inductor is positioned adjacent to the first electronic component without overlapping the antenna end resonator, then impedance stability is maintained during simultaneous communication, but the layout complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-defining the non-overlapping positional relationship between the inductor and antenna end resonator in the design stage. This predetermined configuration ensures that impedance stability is maintained during simultaneous communication operations, as the harmful magnetic field interaction is prevented by the initial spatial arrangement
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
This design effectively reduces the deterioration of filter characteristics, maintains impedance stability during simultaneous communication, and improves heat dissipation and power handling capabilities.
Implementation Method 1
characteristics of the filter may deteriorate due to the influence of the magnetic field generated by the inductor
Implementation Method 2
The filter includes a plurality of acoustic wave resonators
Data Source
AI summary
The deterioration in characteristics of a filter is reduced. In a high frequency module, the filter includes a first substrate, a first functional electrode provided on the first substrate and forming a part of an antenna end resonator, a second substrate separate from the first substrate, and a second functional electrode provided on the second substrate and forming a part of at least one acoustic wave resonator other than the antenna end resonator among a plurality of acoustic wave resonators. A first electronic component including the first substrate and the first functional electrode is disposed on the first main surface of the mounting substrate. An inductor is adjacent to the first electronic component in a plan view from a thickness direction of the mounting substrate. The inductor does not overlap the antenna end resonator in a side view from a direction of a winding axis of a winding portion.