Multi-Frequency Shared Antenna Axis Offset Design
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Solution Overview
Problem
Current multi-frequency shared antenna designs face challenges such as interference and increased difficulty in design due to overlapping radiation arms, asymmetry, and size issues, particularly with coaxial nesting and side-by-side arrangements, which affect radiation characteristics and antenna size.
Innovation Solution
A multi-frequency shared antenna design where low frequency and high frequency radiation arrays are arranged on multiple parallel axes with specific alignment and power settings, allowing for orthogonal projection overlap without interference, and an antenna control system with phase shifters and electromechanical driving components for adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If coaxial nesting is used to arrange low frequency and high frequency radiation units, then antenna width and windward area are reduced, but radiation arms of low frequency units overlap with high frequency units causing severe interference
Solution Approach 1:
The patent transitions from coaxial arrangement (one-dimensional overlap) to multi-axis parallel arrangement (two-dimensional distribution). Low frequency radiation units are distributed on at least two parallel axes that are offset in a direction orthogonal to the axes, while high frequency radiation units are arranged on a separate axis. This dimensional separation prevents radiation arm overlap while maintaining compact antenna width.
Solution Approach 2:
The patent employs asymmetric axis offset design where the parallel axes carrying low frequency radiation units are intentionally offset from each other in the direction orthogonal to the axes. This asymmetric arrangement, combined with different pitch values for low and high frequency units, ensures that radiation arms do not overlap while maintaining balanced radiation characteristics.
2Object-generated harmful factors
If pitch between low frequency radiation units is reduced to avoid overlap, then interference is reduced, but half-power beam width in horizontal plane increases
Solution Approach 1:
Instead of reducing pitch in the axial direction (which would widen beam), the patent distributes radiation units across multiple parallel axes offset in the orthogonal direction. This multi-dimensional arrangement maintains adequate pitch along each axis (preserving beam width) while preventing overlap through lateral separation of radiation arms.
3Adaptability or versatility
If high frequency radiation arrays are added vertically to create triple frequency antenna, then frequency coverage is increased, but antenna length and transmission loss increase
Solution Approach 1:
The patent merges multiple frequency arrays into a shared spatial structure. Low frequency radiation units and high frequency radiation units share the same physical space and reflection plate, with units arranged on parallel axes rather than stacked vertically. This merging approach enables triple-frequency operation while maintaining compact antenna dimensions and reducing transmission loss through shared feeders.
4Adaptability or versatility
If high frequency radiation arrays are added laterally to create triple frequency antenna, then frequency coverage is increased, but antenna width and asymmetry increase
Solution Approach 1:
The patent designs a universal parallel axis structure that can accommodate both low frequency and high frequency radiation units. The same set of parallel offset axes serves multiple frequency bands, eliminating the need for separate lateral expansions. This multi-functional arrangement maintains symmetric radiation characteristics while supporting triple-frequency operation.
Data Source
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AI summary
A multi-frequency shared antenna comprises a low frequency radiation array and a first high frequency radiation array both of which are disposed on a reflection plate and provided with power by different feeding networks. The first high frequency radiation array comprises a number of high frequency radiation units, at least partial high frequency radiation units are arranged on a same axis which overlaps one of two axes of the low frequency radiation array, in all high frequency radiation units arranged on said axis, at least partial high frequency radiation units are nested with the low frequency radiation units arranged on the same axis, and the orthogonal projection area of these nested high frequency radiation units on the reflection plate falls within the orthogonal projection area of the corresponding low frequency radiation units on the same reflection plate.