Composite Electronic Component Filter Antenna Integration
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Solution Overview
Problem
Composite electronic components with integrated filters and antennas suffer from degradation of filter characteristics and distortion of antenna radiation patterns due to the ground conductor layers forming a parallel plate waveguide, leading to unwanted resonances and attenuation issues in high-frequency bands.
Innovation Solution
A multilayer stack configuration with strategically positioned connection conductor sections and a second ground conductor layer that fully encloses the radiation element, preventing the formation of unwanted resonances and maintaining the integrity of both filter and antenna performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If two ground conductor layers are used to connect filter and antenna, then electrical connection is achieved, but unwanted resonances occur degrading filter characteristics
Solution Approach 1:
The ground conductor layer is segmented into multiple sections with ground conductor sections and connection conductor sections alternately arranged. This segmentation prevents the formation of continuous parallel plate waveguide structures, thereby eliminating unwanted resonances while maintaining electrical connection between filter and antenna.
Solution Approach 2:
The harmful continuous ground conductor structure is extracted and replaced with discontinuous ground conductor sections. By removing the continuous path that causes parallel plate waveguide resonance, the unwanted resonances are eliminated while the essential grounding function is preserved through periodic connection conductor sections.
2Reliability
If ground conductor layer is placed between radiation element and filter, then electrical connection is established, but radiation pattern distortion occurs
Solution Approach 1:
The ground conductor layer is divided into discrete ground conductor sections rather than a continuous layer. This segmentation allows electromagnetic waves to pass through the gaps between sections, preventing radiation pattern distortion while maintaining electrical connection through the periodic connection conductor sections.
3Adaptability or versatility
If multilayer stack with ground conductor layers is used, then filter and antenna are integrated, but attenuation characteristic degradation occurs in frequency region above passband
Solution Approach 1:
The continuous ground conductor structure is segmented into discrete sections, preventing the formation of parallel plate waveguide modes that cause unwanted resonances. This segmentation maintains integration benefits while improving attenuation characteristics in the frequency region above the passband.
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 configuration effectively prevents degradation of filter characteristics and distortion of the antenna radiation pattern, ensuring reliable performance across high-frequency bands by controlling the resonant frequencies and maintaining symmetry in the radiation pattern.
Implementation Method 1
the two ground conductor layers form a structure similar to a parallel plate waveguide, thereby generating one or more propagation modes for electromagnetic waves. The one or more propagation modes for electromagnetic waves may generate one or more unwanted resonances
Implementation Method 2
The antenna includes a radiation element formed of one of the plurality of conductor layers. The radiation element is located on a side of the second ground conductor layer opposite from the first ground conductor layer
Data Source
AI summary
A composite electronic component includes a multilayer stack, a filter, and an antenna. The filter is located within the multilayer stack and interposed between a first ground conductor layer and a second ground conductor layer. The antenna includes a radiation element. The radiation element is located on a side of the second ground conductor layer opposite from the first ground conductor layer. When viewed in a direction parallel to the stacking direction of the multilayer stack, the radiation element entirely lies inside the perimeter of the second ground conductor layer. The multilayer stack includes a plurality of connection conductor sections arranged around the filter and connecting the first ground conductor layer and the second ground conductor layer.