Multiband Antenna With Nested Radiating Elements
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Solution Overview
Problem
Existing dual band antennas for wireless communications are not sufficient to accommodate the increasing demand for wireless data traffic and future frequency bands, as they require additional radiating elements that can cause interference and are not compatible with existing antenna towers due to size constraints.
Innovation Solution
A multiband antenna design that includes radiating elements for Bands 1, 2, 3, and 4, with a longitudinal ground plane and sets of radiating elements arranged to minimize interference and maintain a compact size, allowing for diversity reception and operation across multiple frequency bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If additional radiating elements for Band 3 and Band 4 are added to a conventional dual band antenna, then the antenna can accommodate future traffic demands and operate in more frequency bands, but the antenna width increases and may not fit on existing towers
Solution Approach 1:
The patent nests radiating elements for multiple frequency bands within a common support structure. Specifically, Band 1 and Band 2 elements are nested within each other, and Band 3 and Band 4 elements are nested within the same support, allowing four frequency bands to be accommodated without proportionally increasing the antenna's external dimensions.
Solution Approach 2:
The patent transitions from aligning all radiating elements along a single axis to distributing them across multiple dimensions. Band 1 and Band 2 elements are arranged along a first axis, while Band 3 and Band 4 elements are arranged along a second axis that is transverse to the first axis, enabling compact multiband operation.
2Length of stationary object
If radiating elements are aligned along a single axis to minimize antenna width, then the antenna fits existing towers, but there is limited space for adding additional frequency band elements
Solution Approach 1:
The patent introduces a second transverse axis for arranging radiating elements, perpendicular to the first axis. This dimensional transition allows Band 3 and Band 4 elements to be positioned without interfering with the Band 1 and Band 2 elements along the first axis, thereby expanding frequency band capacity while maintaining compact width.
3Adaptability or versatility
If radiating elements for different bands are interspersed or nested, then the antenna can operate in multiple bands, but the elements may introduce interference and distortion in each other's operation
Solution Approach 1:
The patent segments the antenna into distinct functional groups: Band 1 and Band 2 elements are separated and assigned to different axes, and Band 3 and Band 4 elements are similarly segregated. This segmentation reduces mutual interference by spatially isolating elements operating at different frequencies.
Solution Approach 2:
By distributing radiating elements across two transverse axes rather than concentrating them along a single axis, the patent reduces near-field coupling and interference between elements of different frequency bands while maintaining compact overall dimensions.
Data Source
AI summary
A multiband antenna is provided having a longitudinal ground plane and several linear arrays of radiating elements mounted on the ground plane. A first set of first radiating elements may be disposed lengthwise along a center of the ground plane. The first radiating elements may be dimensioned to operate in a first frequency band, such a frequency range of about 790-960 MHz. A second set of second radiating elements may also be disposed lengthwise along the center of the ground plane. The second radiating elements may be dimensioned to operate in a second frequency band, such as a frequency range of about 1710-2170 MHz. A third set of third radiating elements is disposed lengthwise on the ground plane on a first side of the first and second sets of radiating elements. The third radiating elements may be dimensioned to operate at a third frequency band, such as about 2.5-2.7 GHz and/or 3.4-3.8 GHz. The fourth set of fourth radiating elements is disposed lengthwise on the ground plane on a second side of the first and second sets of radiating elements. The fourth radiating elements are dimensioned to operate in the same frequency band as the third radiating elements.