Planar Antenna Element With Intersecting Slit For MIMO Isolation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing antenna configurations for mobile communication devices face challenges in achieving high isolation between antenna elements at low frequencies while maintaining a small size, which is essential for MIMO communication and reducing antenna volume, especially as frequency bands expand and wavelengths increase, leading to stronger coupling and reduced power radiation.
Innovation Solution
The proposed antenna apparatus features a planar antenna element with multiple feed points and extension conductors connected to its perimeter, where a slit or slot intersects between feed points and connecting points, allowing for adjustable resonance frequency and isolation by varying the length of the slit or slot, enabling high isolation and reduced size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple antenna elements are provided for MIMO communication, then communication capacity is improved, but antenna volume increases
Solution Approach 1:
The patent merges multiple antenna elements onto a single substrate, sharing common ground structures and support mechanisms. Multiple antenna elements are integrated on one substrate with shared grounding, reducing the overall volume compared to separate antenna assemblies while maintaining MIMO communication capacity through spatial multiplexing of the integrated elements.
Solution Approach 2:
The patent employs a nested configuration where antenna elements are arranged in overlapping or nested patterns on the substrate. The antenna elements are positioned to utilize three-dimensional space efficiently, with elements potentially nested within each other's projection areas or arranged in layered configurations, thereby maximizing communication capacity within a compact volume.
2Volume of stationary object
If antenna elements are placed closer together to reduce size, then antenna volume is reduced, but isolation between elements deteriorates
Solution Approach 1:
The patent implements local quality variations through non-uniform ground structure designs and selective positioning of antenna elements. Different regions of the substrate have optimized ground configurations and element placements tailored to maintain isolation in critical areas while allowing closer spacing in regions where isolation requirements are less stringent, thus reducing overall volume without compromising reliability.
Solution Approach 2:
The patent introduces intermediary structures such as ground planes, isolation barriers, and parasitic elements positioned between antenna elements. These intermediary components act as electromagnetic shields or coupling adjusters, maintaining adequate isolation between closely spaced elements while enabling compact overall antenna volume through efficient space utilization.
3Adaptability or versatility
If frequency band is expanded for more applications, then communication versatility is improved, but wavelength increases leading to stronger coupling
Solution Approach 1:
The patent implements dynamic characteristics through adjustable and reconfigurable antenna elements that can adapt their electrical length and resonance frequency. Elements incorporate variable components such as switched capacitor networks, varactor diodes, or mechanically adjustable structures that allow real-time tuning of coupling characteristics, enabling the antenna system to maintain optimal performance across expanded frequency bands while managing coupling effects dynamically.
Solution Approach 2:
The patent employs parameter changes by varying ground structure dimensions, element geometries, and material properties across different frequency optimization zones. The design incorporates multiple resonant structures with different electrical characteristics that can be selectively activated or tuned, allowing the antenna system to adapt to different frequency bands while controlling coupling through parameter optimization for each operating mode.
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 efficient MIMO communication by achieving high isolation between feed points at low frequencies, reducing antenna size, and optimizing resonance and isolation frequencies, enabling simultaneous transmission and reception of low-coupling radio signals while maintaining a compact design.
Implementation Method 1
a slit or slot intersects between feed points and connecting points, allowing for adjustable resonance frequency and isolation by varying the length of the slit or slot
Implementation Method 2
The antenna element is simultaneously driven through the first and second feed points so as to simultaneously operate as first and second antenna portions
Data Source
AI summary
An antenna apparatus includes: an extension conductor connected to a first section of an outer perimeter of an antenna element and along an entire length of the first section; connecting conductors connecting the antenna element to a ground conductor between the extension conductor and feed points on the antenna element; and a slit extending from the extension conductor to the antenna element so as to intersect a portion between connecting points of the connecting conductors and to intersect a portion between the feed points on the antenna element. The slit has a short-circuited end on the extension conductor.