Multi-Band Vehicular Antenna Layout for Compact Size and Gain
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Solution Overview
Problem
There is a demand for miniaturizing vehicular antenna devices while maintaining antenna gains, as existing multi-antenna configurations face challenges in securing gains during size reduction.
Innovation Solution
The antenna device incorporates a base with a first antenna for a first frequency band and a second antenna for a second frequency band, both equipped with capacitance loading elements, where the second frequency band antenna is positioned above the first, with specific geometrical configurations to minimize overlap and maximize gain, including the use of helical elements and LC circuits to manage impedance and coupling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple antennas are installed in a common case, then multi-frequency band reception capability is improved, but device size increases
Solution Approach 1:
The patent applies nesting by placing the second antenna (for higher frequency band) above the first capacitance loading element of the first antenna (for lower frequency band) in the vertical direction. This allows multiple antennas to occupy overlapping or adjacent spatial regions, enabling multi-frequency band reception while minimizing the overall device volume.
Solution Approach 2:
The patent transitions from horizontal arrangement to vertical stacking by positioning antennas in the vertical direction. The second antenna is disposed above the base at a front side of the first capacitance loading element, utilizing the vertical dimension to pack multiple antennas into a compact footprint, thereby reducing the device's planar area while maintaining multi-band functionality.
2Volume of stationary object
If antenna size is reduced for miniaturization, then device compactness is improved, but antenna gain decreases
Solution Approach 1:
The patent applies local quality by giving the second antenna an asymmetric configuration where one side portion extends further than the other. This localized extension optimizes the current distribution and radiation pattern in specific directions, maintaining antenna gain despite the overall compact size. The asymmetric design allows the antenna to achieve adequate gain performance within a reduced volume by concentrating effective radiating elements in critical regions.
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 allows for miniaturization of the antenna device while suppressing the reduction of antenna gains, ensuring effective reception across multiple frequency bands without the need for wave separation circuits and maintaining sensitivity by adjusting inductances to avoid resonance frequency overlap.
Implementation Method 1
a first antenna (for a first frequency band) includes a first capacitance loading element, the second antenna (for a second frequency band) includes a second capacitance loading element
Implementation Method 2
maintaining sensitivity by adjusting inductances to avoid resonance frequency overlap
Implementation Method 3
the first antenna includes a first helical element between the first capacitance loading element and a first feeding point, and the second antenna includes a second helical element between the second capacitance loading element and a second feeding point
Data Source
Figure 1~2
Figure 3
Figure 4~5
AI summary
The present invention provides an antenna device that can be miniaturized while suppressing a drop in antenna gain. A band III capacity loaded element 8 is made up of one metal sheet component and has a side part 8a and a top part 8b. The side part 8a is a flat surface perpendicular to a base. The side part 8a is shaped so that the height with respect to the base increases from the front toward the rear. The top part 8b is a portion that is bent from the upper end of the side part 8a. The upper edge of the side part 8a and the left edge of the top part 8b come in contact with each other. The top part 8b is perpendicular to the side part 8a. The top part 8b has a smaller angle with respect to the base than the side part 8a. The right edge of the top part 8b is the outer edge of the band III capacity loaded element 8.