Stacked Cross-Polarization Multiband Antenna Design
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Solution Overview
Problem
Current multiband antennas require multiple networks for different frequency bands, leading to visual overload, increased costs, and environmental impact, as well as performance degradation due to asymmetry and cross-polarization issues in existing configurations.
Innovation Solution
A multiband antenna radiating element comprising two pairs of dual cross-polarization dipoles with distinct frequency bands, where the lower frequency band dipoles serve as a ground plane for the higher frequency band, reducing spatial occupancy and maintaining symmetry to minimize interference and enhance performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If radiating elements for different frequency bands are aligned parallel to each other in a longitudinal periodic structure, then the antenna can support multiple frequency bands, but the antenna width increases and radiation performance degrades
Solution Approach 1:
The patent transitions from a longitudinal periodic structure (elements aligned parallel in one dimension) to a stacked configuration where radiating elements for different frequency bands are positioned at different heights (adding vertical dimension). This allows multiple frequency bands to be supported while reducing the horizontal width of the antenna, as elements are distributed in the vertical direction rather than extending horizontally.
2Adaptability or versatility
If radiating elements for different frequency bands are aligned parallel to each other, then the antenna can support multiple frequency bands, but cross-polarization performance degrades in the ±60° angular section
Solution Approach 1:
By stacking radiating elements vertically at different heights rather than aligning them parallel in the same plane, the patent creates a three-dimensional arrangement that improves cross-polarization performance. The vertical separation reduces the strabismus effect and asymmetry in the azimuth alignment plane, thereby maintaining better cross-polarization characteristics in the ±60° angular section while still supporting multiple frequency bands.
3Adaptability or versatility
If multiple single band antennas are combined in a single antenna chassis, then the number of antenna networks is reduced, but the device complexity increases
Solution Approach 1:
The patent combines multiple single-band antennas into a single multiband antenna structure by stacking radiating elements for different frequency bands (GSM, DCS, UMTS) in a vertical arrangement within one chassis. This merging approach reduces the total number of antenna networks needed while managing complexity through a systematic stacked configuration that shares common support structures and mounting mechanisms.
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 solution reduces the antenna's width and surface area, lowering manufacturing costs while improving radiation performance by reducing disruption between frequency bands and maintaining symmetry, thus enhancing overall efficiency.
Implementation Method 1
The second radiating plane is positioned above the first from which it is electrically insulated
Implementation Method 2
A dual polarization radiating element consists of two independent dipoles each of which comprises two collinear conducting arms with a given polarization (positive or negative) to send and receive radiofrequency signals
Implementation Method 3
The radiating elements are assembled in a longitudinal alignment above a reflector which refines the directivity of the radiation pattern of the set created by reflecting the rear radiation of the dipoles
Data Source
AI summary
The subject of this invention is a multiband antenna radiating element comprising a first pair of cross-polarization dipoles each of which comprises two collinear conducting arms, whereby the four conducting arms define a first radiating plane corresponding to a low frequency band. The radiating element also consists of at least a second pair of cross-polarization dipoles each of which comprises two collinear conducting arms, whereby the four conducting arms define a second radiating plan corresponding to a higher frequency band. The first and second radiating planes are parallel; the second radiating plane is positioned above the first from which it is electrically insulated and the surface of the first radiating plane covering the conducting arms of the first pair of dipoles is larger than the surface of the second radiating plane covering the conducting arms of the second pair of dipoles. The first radiating plane can be defined by a first pair of dual cross-polarization dipoles or one printed circuit dipole and the second radiating plane can be defined by a second pair of dipoles chosen from cross dipoles, butterfly dipoles and printed circuit dipoles.