Nested Multiband MIMO Antenna Layout for Compact High-Band Gain
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional multiband MIMO antennas face challenges in maintaining a small overall size while achieving high frequency band performance due to the size difference between low and high frequency band antenna elements, leading to squinted patterns and uneven radiating apertures.
Innovation Solution
A multiband MIMO antenna assembly with a nested arrangement, featuring dual polarised lower and upper band antenna elements, where the upper band elements are nested within the lower band elements, utilizing ultra-wideband duplexers and feeding networks to maintain a compact size and enhance forward gain without increasing the antenna array's footprint.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional side by side layout of lower band and upper band radiating elements is used, then the antenna can provide coverage for multiple frequency bands, but it causes squinted patterns at the upper frequency band and increases the overall size
Solution Approach 1:
The patent implements a nested arrangement where upper band radiating elements are positioned within the structure defined by lower band radiating elements. Specifically, the upper band elements are located at the centers of the lower band elements, creating a compact nested configuration that eliminates squinted patterns while maintaining multiband coverage capability.
2Adaptability or versatility
If conventional side by side layout of lower band and upper band radiating elements is used, then the antenna can provide coverage for multiple frequency bands, but it increases the overall size and footprint
Solution Approach 1:
The patent implements a nested arrangement where upper band radiating elements are positioned within the structure defined by lower band radiating elements. Specifically, the upper band elements are located at the centers of the lower band elements, creating a compact nested configuration that eliminates squinted patterns while maintaining multiband coverage capability.
3Adaptability or versatility
If conventional cable arrangement for feeding network is used, then the antenna can connect multiple radiating elements, but it increases device complexity and reduces manufacturing simplicity
Solution Approach 1:
The patent combines the feeding networks for lower band and upper band elements into a single integrated feeding structure. The feeding network uses a progressive mesh topology that simultaneously feeds multiple lower band elements and upper band elements, eliminating the need for separate cable arrangements and reducing overall device complexity.
4Reliability
If additional upper band antenna elements are added to improve high frequency performance, then the forward gain and radiation pattern improve, but the overall size and height of the antenna increases
Solution Approach 1:
The patent implements a nested arrangement where upper band radiating elements are positioned within the structure defined by lower band radiating elements. Specifically, the upper band elements are located at the centers of the lower band elements, creating a compact nested configuration that eliminates squinted patterns while maintaining multiband coverage capability.
Solution Approach 2:
The patent utilizes vertical stacking and three-dimensional spatial arrangement to accommodate multiple upper band elements without increasing horizontal footprint. The feeding network is arranged in multiple layers above the ground plane, allowing additional elements to be integrated in the vertical dimension rather than expanding the horizontal area.
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
The nested arrangement allows for additional upper band antenna elements without increasing the antenna's size, providing improved radiation patterns and forward gain across multiple frequency bands while maintaining a low profile and cost-effectiveness.
Implementation Method 1
dual polarised lower band antenna elements mounted to the ground plane and located proximal to peripheral sides of the ground plane
Data Source
AI summary
MIMO dual-polarised antenna assembly arranged in a nested arrangement. The antenna assembly comprises a ground plane and a dual-polarised lower band antenna elements mounted to the ground plane proximal to peripheral sides of the ground plane. The location of the lower band antenna elements defines a lower band peripheral boundary. The antenna assembly comprises (1) dual-polarised upper band antenna elements mounted to the ground plane, nested within the lower band peripheral boundary, (2) an upper feeding network configured to connect opposing pairs of lower band radiating elements of the dual polarised lower band antenna elements and feed the lower band antenna elements, the upper feeding network being located within the lower band peripheral boundary, and (3) a lower feeding network positioned below the upper feeding network, and is configured to feed the dual polarised lower band antenna elements via the upper feeding network using a pair of ultra-wideband duplexers.