Dual-Polarization Antenna Filter Layout in Diagonal Planar Space
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Solution Overview
Problem
Existing dual polarization antenna modules face challenges in efficiently integrating large-sized filter circuits, such as ½-wavelength filters, due to spatial constraints.
Innovation Solution
The antenna module incorporates first and second filters with specific conductor patterns arranged diagonally and capacitively coupled, allowing for the insertion of ½-wavelength filters between signal pads and the antenna element, enabling dual polarization while maintaining a compact design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If large-sized filter circuits (such as ½-wavelength filters) are integrated into the antenna module, then filter characteristics and dual polarization performance are improved, but the planar area required increases
Solution Approach 1:
The patent transitions from conventional linear filter layouts to a diagonal arrangement of conductor patterns. The second and third conductor patterns are arranged in a line extending along the diagonal line of the antenna element, as are the sixth and seventh conductor patterns. This diagonal configuration exploits the unused diagonal space within the planar substrate, effectively packing the ½-wavelength filter circuits into a smaller footprint while maintaining their electrical length and filtering performance.
Solution Approach 2:
The patent implements nested positioning of conductor patterns where the first and fourth conductor patterns are arranged to face each other with the diagonal line interposed, and the fifth and eighth conductor patterns are similarly arranged. This nested configuration allows multiple filter circuits to be interleaved and packed efficiently within the same planar region, reducing the overall area required while maintaining proper electrical isolation and coupling.
2Device complexity
If conventional filter layouts are used, then the design is simpler, but unnecessary coupling between the antenna and filter increases
Solution Approach 1:
The patent employs asymmetric positioning of conductor patterns relative to the antenna element. The second and third conductor patterns extend along one diagonal direction, while the sixth and seventh conductor patterns extend along the same diagonal but are positioned to face each other with the diagonal line interposed. This asymmetric diagonal arrangement creates natural electromagnetic isolation zones that reduce unnecessary coupling between the filter circuits and the antenna element, while still allowing required signal coupling through the designated paths.
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 enhances filter characteristics, achieves dual polarization, and allows for the integration of large-sized filters within a limited planar size, improving return loss and reducing unnecessary coupling between the antenna and filter.
Implementation Method 1
The second and third conductor patterns are arranged in a line so as to extend in a first direction along the diagonal line of the antenna element. The sixth and seventh conductor patterns are arranged in a line so as to extend in the first direction along the diagonal line of the antenna element. The second and sixth conductor patterns face each other in a second direction perpendicular to the first direction with the diagonal line interposed therebetween. The third and seventh conductor patterns face each other in the second direction with the diagonal line interposed therebetween.
Data Source
AI summary
An antenna module includes first and second signal pads, an antenna element, and first and second filters. The first signal pad is coupled to the antenna element through the first to fourth conductor patterns of the first filter. The second signal pad is coupled to the antenna element through the fifth to eighth conductor patterns of the first filter. The second, third, sixth and seventh conductor patterns extend along the diagonal line of the antenna element. The second and sixth conductor patterns face each other with the diagonal line interposed therebetween. The third and seventh conductor patterns face each other with the diagonal line interposed therebetween. The first, fourth, fifth and eighth conductor patterns extend in the second direction, respectively with respect to the second, third, sixth and seventh conductor patterns.