Multiband Antenna Cup-Shaped Elements Symmetric Design
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Solution Overview
Problem
Current multiband antennas face challenges in optimizing antenna size, reducing interference between radiation elements, and narrowing the antenna width, especially when implementing broadband characteristics for frequency bands like 1710-2690 MHz, which complicates efficient design and installation in limited spaces.
Innovation Solution
The proposed solution involves a multimode antenna structure with cup-shaped radiation elements arranged on a reflector, where first radiation modules for lower frequency bands (698-960 MHz) are combined symmetrically in four directions, and second radiation modules for higher frequency bands (1710-2690 MHz) are laminated on these modules, forming an X-polarized wave, with feed lines and spacers to minimize interference and optimize ground plane symmetry.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple antennas are installed to support MIMO in various frequency bands, then data transmission speed is improved, but tower space requirements increase and installation costs increase
Solution Approach 1:
The patent combines multiple antenna functions into a single multiband antenna structure that supports MIMO across multiple frequency bands (700MHz, 2.1GHz, 2.6GHz). Multiple radiation elements are integrated within one antenna assembly, eliminating the need for separate antennas for each band and MIMO stream, thus reducing tower space requirements while maintaining high data transmission capacity
Solution Approach 2:
The antenna structure is designed to perform multiple functions simultaneously: it supports multiple frequency bands (700MHz, 2.1GHz, 2.6GHz), multiple MIMO streams (4x4 MIMO), and dual polarization modes. This multi-functional design allows a single antenna to replace what would traditionally require multiple separate antennas, optimizing tower space utilization
2Area of stationary object
If a multiband antenna structure is used to reduce tower space, then antenna area is optimized, but interference between radiation elements increases
Solution Approach 1:
The patent applies different structural configurations to different radiation elements based on their frequency band requirements. Low band elements (700MHz) use a different geometric arrangement compared to high band elements (2.1GHz, 2.6GHz), with optimized spacing and orientation for each band to minimize mutual interference while maintaining compact overall dimensions
Solution Approach 2:
The antenna structure nests radiation elements for different frequency bands within the same physical space. High frequency elements are positioned within the overall envelope defined by low frequency elements, with careful spacing and shielding to prevent interference. This nested arrangement achieves multiband functionality in a compact form factor while managing element interactions
3Adaptability or versatility
If broadband radiation elements are implemented for frequency bands like 1710-2690 MHz, then frequency band coverage is improved, but interference problem between elements becomes more serious
Solution Approach 1:
The patent implements frequency-selective structural characteristics where radiation elements are designed with band-specific geometries and positioning. Broadband elements covering 1710-2690MHz are given distinct spatial arrangements compared to other bands, with optimized element spacing and orientation that minimizes interference specifically for the broadband operation while maintaining broad frequency coverage
Data Source
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AI summary
The present invention relates to a multiband antenna comprising: a reflector providing a ground plane; a first radiation module for a first frequency band, provided on the reflector; and a plurality of second radiation modules for a second frequency band, laminated on the first radiation module, wherein: the first radiation module includes first to fourth radiation elements symmetrically combined in four directions on an entire plane, wherein each of the first to fourth radiation elements includes a radiation arm in a cup shape and a support for supporting and fixing the radiation arm to the reflector, and the second radiation modules are provided to each radiation arm of the first to fourth radiation elements, wherein the lower surface of the cup shape of each radiation arm of the first to fourth radiation elements is designed to have a predetermined area for providing the ground plane to the second radiation modules.