Interleaved Antenna Elements for Multi-Band Isolation
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Solution Overview
Problem
Existing antenna arrays for mobile communication systems face challenges in operating multiple frequency bands with reduced coupling and minimal space requirements, often requiring expensive cavity filters when frequency bands are close together.
Innovation Solution
The antenna arrangement features interleaved antenna elements in a single column, with each element operating in a single frequency band, and maintaining consistent spacing between elements, which reduces coupling between frequency bands and eliminates the need for cavity filters, achieving isolation of over 30 dB without them.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If single frequency band antennas are arranged in separate rows for multiple frequency bands, then frequency band operation is achieved, but space requirement increases and interference sensitivity increases
Solution Approach 1:
The patent combines multiple frequency band antenna elements into a single vertical column arrangement, merging what would traditionally be separate rows into one integrated structure. This reduces the horizontal space footprint while maintaining multi-frequency band capability through the interleaved positioning of elements tuned to different frequency bands.
Solution Approach 2:
The patent transitions from a horizontal multi-row arrangement to a vertical single-column arrangement, effectively changing the spatial dimension of the antenna array. By stacking antenna elements vertically with interleaved positioning, the system achieves multi-frequency band operation in a compact vertical footprint rather than requiring horizontal expansion.
2Area of stationary object
If dual band antenna elements are arranged alternatively in a column, then space is reduced, but coupling between frequency bands increases
Solution Approach 1:
The patent applies local quality by assigning different operational characteristics to different positions within the vertical column. Antenna elements are strategically positioned at specific vertical intervals, with each element optimized for its designated frequency band. The interleaved arrangement creates local separation zones between elements of different frequency bands, reducing coupling while maintaining compact overall dimensions.
3Productivity
If frequency bands are placed close together, then spectrum efficiency is improved, but coupling increases requiring high Q filters
Solution Approach 1:
The patent introduces the vertical spacing between antenna elements as an intermediary mechanism to reduce coupling. By positioning elements tuned to different frequency bands at specific vertical intervals within the column, the structure creates natural isolation zones that act as intermediaries, reducing electromagnetic coupling without requiring additional filtering components. This allows frequency bands to be placed closer together while maintaining acceptable isolation.
4Object-generated harmful factors
If parallel columns are used to reduce coupling, then isolation is improved, but device complexity and space increase
Solution Approach 1:
The patent merges multiple parallel column arrangements into a single integrated vertical column. By interleaving antenna elements from what would traditionally be separate columns into one unified structure, the system maintains the isolation benefits of separated elements while eliminating the complexity and space requirements of multiple distinct columns. The single column design simplifies mounting and structural support requirements.
Data Source
Figure 1A~2B
Figure 2C
Figure 3
AI summary
The present invention relates to an antenna arrangement connectable to a transceiver for transmitting and receiving RF signals in at least two separate frequency bands. The antenna arrangement has at least two sets of antenna elements arranged on a reflector, and the antenna elements are arranged in an interleaved configuration along a single column. The two separate frequency bands are substantially non-overlapping but relatively close to each other, and the distance between adjacent antenna elements in said column is substantially the same along the column.