Dual-Polarized Radiating Element for Broadband mMIMO Arrays
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Solution Overview
Problem
Conventional radiating elements are insufficient for multiband antennas with tightly spaced arrays, failing to provide broadband characteristics and low profile designs necessary for integration with mMIMO arrays while maintaining RF performance.
Innovation Solution
A dual-polarized radiating element with a dipole feeding concept, featuring four feedable slots and dipole arms arranged at regular angular intervals, optimized for broadband performance and minimized interference with tightly spaced arrays, utilizing short-ended microstrip lines and parasitic directors to extend slot length and reduce footprint.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If conventional LB radiating elements are used in multiband antenna architectures with tightly spaced HB arrays, then the antenna width can be reduced, but the RF performance and bandwidth coverage deteriorate
Solution Approach 1:
The radiating element employs a three-dimensional structure with dipole arms extending in multiple directions (horizontal and vertical components) to achieve broadband radiation characteristics while maintaining a compact horizontal footprint. This dimensional approach allows the element to radiate effectively across multiple frequency bands without increasing antenna width.
Solution Approach 2:
The radiating element integrates multiple functional components within a compact structure: the feeding arrangement with slots is nested within the dipole arm structure, and parasitic directors are positioned to enhance radiation without increasing overall footprint. This nested configuration enables broadband performance in a space-efficient design.
2Ease of operation
If the antenna height is reduced to simplify deployment, then the deployment process is simplified, but the relative bandwidth coverage and RF performance deteriorate
Solution Approach 1:
The radiating element utilizes vertical dipole arms extending perpendicular to the antenna surface to achieve the necessary electrical length for broadband operation. This vertical dimension allows the element to maintain adequate bandwidth coverage while keeping the horizontal footprint compact, facilitating simplified deployment without compromising RF performance.
Solution Approach 2:
The design employs adjustable parameters including dipole arm lengths, slot dimensions, and parasitic director positions to optimize bandwidth coverage within the constrained height. By carefully tuning these geometric parameters, the element achieves broadband performance in a low-profile configuration suitable for simplified deployment.
3Area of stationary object
If tightly spaced HB arrays are placed closer together to meet size limitations, then the antenna width is reduced, but interference between arrays increases
Solution Approach 1:
The radiating element exhibits directionally selective radiation characteristics through its dipole arm configuration, concentrating radiation in specific directions while providing natural isolation in others. This local quality control of radiation patterns reduces interference between tightly spaced arrays while maintaining compact antenna width.
Solution Approach 2:
Parasitic directors are positioned between the dipole arms to act as intermediaries that control the radiation pattern and provide isolation between adjacent arrays. These directors mediate the electromagnetic fields to reduce mutual interference while allowing the arrays to be placed closer together.
4Reliability
If conventional radiating elements are used to maintain RF performance, then the bandwidth coverage is adequate, but the antenna height and footprint increase
Solution Approach 1:
The radiating element transitions from a planar configuration to a three-dimensional structure with dipole arms having both horizontal and vertical components. This dimensional change enables the element to achieve broadband RF performance while significantly reducing the horizontal footprint compared to conventional planar elements.
Solution Approach 2:
The dipole arms are configured with asymmetric lengths and orientations relative to the antenna surface, with different arm lengths and angles optimized for broadband radiation. This asymmetric configuration allows efficient radiation across multiple frequency bands while maintaining a compact footprint.
Data Source
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AI summary
The present invention provides a dual-polarized radiating element (100) comprising a feeding arrangement (101) and four dipole arms (103). The feeding arrangement (101) comprises four slots (102), which extend from a periphery towards a center of the feeding arrangement (101) and are arranged at regular angular intervals (104) forming a first angular arrangement. The four dipole arms (103) extend outwards from the feeding arrangement (101) and are arranged at regular angular intervals (105) forming a second angular arrangement. The second angular arrangement of the four dipole arms (103) is rotated (106) with respect to the first angular arrangement of the four slots (102).