Lattice-Spaced Multi-Band Antenna Array for Compact Beam Control
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Solution Overview
Problem
Conventional antenna devices for multi-band communication systems face challenges in maintaining compact size and optimal antenna characteristics as the number of frequency bands increases, often resulting in increased size and deterioration of antenna performance due to uneven spacing of antenna elements across different frequency bands.
Innovation Solution
The antenna device employs a phased array configuration where antenna elements corresponding to different frequency bands are disposed at specific lattice points with intervals based on half wavelengths of their respective frequencies, using the formula {(n·d)^2 + (m·d)^2}^{1/2} for the second frequency band and integral multiples for the first and third frequency bands, ensuring uniform spacing and overlap to maintain compactness and performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If antenna elements for different frequency bands are disposed with uniform spacing to maintain compact size, then device size is reduced, but antenna characteristics such as directional and sidelobe characteristics deteriorate
Solution Approach 1:
The patent applies local quality by assigning different spacing intervals to antenna elements of different frequency bands within the same array. Specifically, first antenna elements (higher frequency) are spaced at interval d1, while second antenna elements (lower frequency) are spaced at interval d2, where d1 ≠ d2. This allows each frequency band to have its optimal element spacing locally, preventing deterioration of directional and sidelobe characteristics while maintaining overall compact device size through the unified array structure.
Solution Approach 2:
The patent segments the antenna array into distinct groups of first antenna elements and second antenna elements, each optimized for specific frequency bands. This segmentation enables independent optimization of element spacing for each frequency band (d1 for higher frequency, d2 for lower frequency), resolving the contradiction between compact overall size and maintained antenna characteristics for each band.
2Reliability
If separate antenna arrays are used for different frequency bands to maintain optimal characteristics, then antenna characteristics are preserved, but device size increases
Solution Approach 1:
The patent merges multiple frequency band antenna arrays into a single unified antenna array structure. First antenna elements for higher frequency bands and second antenna elements for lower frequency bands are integrated in the same physical array, sharing common support structures and control systems. This combining approach maintains optimal antenna characteristics for each band through differentiated element spacing while significantly reducing overall device size compared to separate arrays.
Solution Approach 2:
The unified antenna array structure serves multiple frequency bands simultaneously, making it multi-functional. The same physical array structure handles both higher frequency bands (with element spacing d1) and lower frequency bands (with element spacing d2), eliminating the need for separate dedicated arrays for each frequency band and thereby reducing device size while preserving characteristics.
3Volume of moving object
If antenna elements are densely packed to reduce device size, then device size is reduced, but frequency characteristics and beam control performance deteriorate
Solution Approach 1:
The patent applies local quality by implementing frequency-specific element spacing within the unified array. First antenna elements operate with spacing d1 optimized for higher frequency bands, while second antenna elements operate with spacing d2 optimized for lower frequency bands. This local optimization prevents degradation of frequency characteristics and beam control performance even when the overall device size is reduced through the compact unified structure.
Data Source
AI summary
An antenna device includes: a plurality of first antenna electrodes corresponding to a first frequency; and a plurality of second antenna electrodes corresponding to a second frequency lower than the first frequency, wherein each of the first antenna electrodes is disposed at a different one of lattice points at an interval of a half wavelength of the first frequency, and each of the second antenna electrodes is disposed at a different one of lattice points at an interval represented by the formula {(n·d)2+(m·d)2}1/2, where d is the half wavelength of the first frequency, and n and m are positive integers.