Dual-Polarized Radiator Layout for Compact High-Isolation Antennas
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing dual-polarized radiating elements for mobile communication antennas are large and inefficient, particularly in achieving high port isolation, gain, and symmetrical far-field properties.
Innovation Solution
A compact dual-polarized radiator arrangement comprising four radiator segments and a reflector arrangement, where each radiator segment is arranged at a 90° rotation relative to its neighbors, forming a square arrangement. This design includes minor and main radiating surfaces, a feeding assembly, and a holding device to maintain the structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If traditional dual-polarized radiating elements are used, then port isolation and gain can be achieved, but the dimensions become relatively large
Solution Approach 1:
The radiator is divided into four separate radiator segments (first, second, third, and fourth segments), each with specific orientations and configurations. This segmentation allows each segment to contribute to different polarization components while maintaining compact overall dimensions, resolving the contradiction between small size and performance.
Solution Approach 2:
The patent utilizes three-dimensional spatial arrangement by positioning radiator segments at different orientations (e.g., first segment along x-axis, second segment along y-axis, third segment along negative x-axis, fourth segment along negative y-axis) and different heights above the reflector. This dimensional arrangement enables compact footprint while maintaining the electrical length and isolation performance.
2Ease of manufacture
If radiator dimensions are reduced for compactness, then manufacturing and installation costs decrease, but maintaining high port isolation and gain becomes difficult
Solution Approach 1:
The patent employs asymmetric configurations in several aspects: different lengths of radiator segments (e.g., first and third segments have different lengths than second and fourth segments), non-uniform spacing between segments, and asymmetric feeding arrangements. These asymmetric designs enable compact dimensions while maintaining the electrical properties needed for high port isolation and gain through optimized current distribution.
Solution Approach 2:
The patent optimizes specific parameters including the lengths of radiator segments, their spacing distances, heights above the reflector, and feeding point positions. By carefully adjusting these parameters, the design achieves compact physical dimensions while maintaining the electrical length and impedance characteristics necessary for high performance at reduced manufacturing cost.
3Area of stationary object
If compact radiator arrangement is used, then installation space is reduced, but achieving symmetrical far-field properties becomes challenging
Solution Approach 1:
The patent assigns different local characteristics to different radiator segments: first and third segments are oriented along the x-axis while second and fourth segments are oriented along the y-axis. Each segment has specific length variations and positioning that contribute to the overall symmetrical far-field pattern. This local differentiation enables compact arrangement while maintaining global symmetry in the radiation pattern.
Solution Approach 2:
The patent incorporates preliminary design considerations for far-field symmetry by arranging radiator segments in predetermined orientations and positions before deployment. The segments are configured with specific phase relationships and spatial arrangements that pre-establish the symmetrical far-field properties, ensuring that even in compact form, the antenna maintains stable and symmetrical radiation characteristics.
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 compact dual-polarized radiator arrangement achieves high port isolation and gain while maintaining symmetrical far-field properties, allowing it to operate efficiently across a wide frequency range, such as 698 MHz to 960 MHz, with reduced dimensions.
Implementation Method 1
The four radiator segments are arranged on the reflector arrangement
Data Source
AI summary
A dual-polarized radiator arrangement (1) comprises four radiator segments (4a, 4b, 4c, 4d) and a reflector arrangement (2). The radiator segments (4a, 4b, 4c, 4d) are arranged such that they form a square arrangement. Each radiator segment (4a, 4b, 4c, 4d) comprises a minor radiating surface (5) having a first and a second end (5a, 5b) and a feeding assembly (9). Each radiator segment (4a, 4b, 4c, 4d) comprises a first and a second main radiating surface (8a, 8b) arranged in the area of the first end (5a) and the second end (5b) of the minor radiating surface (5) and miming in the direction of the reflector arrangement (2). The first and second main radiating surfaces (8a, 8b) protrude beyond the respective first and second ends (5a, 5b) of the minor radiating surface (5) in the longitudinal direction (6a) of the minor radiating surface (5).