Intra-Cavity Wall Reduces Cross-Coupling in Cavity-Backed Patch Antennas
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Solution Overview
Problem
Conventional cavity-backed patch radiators suffer from cross-coupling issues between adjacent antenna elements, leading to reduced gain and limited scan angles in phased arrays, especially in applications like aircraft where a low-profile, flush-mounted design is required.
Innovation Solution
Incorporating conductive cavity walls and an intra-cavity wall within each antenna element to reduce cross-coupling and increase cross-polarization isolation, enhancing the array's gain and scan volume performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If cavity height is reduced through dielectric loading, then volume is reduced, but bandwidth and efficiency are reduced
Solution Approach 1:
The cavity is segmented into multiple regions by introducing intra-cavity walls that divide the cavity into separate compartments. This segmentation allows independent optimization of different cavity regions, enabling reduced overall volume while maintaining sufficient space for electromagnetic field distribution and impedance matching, thereby preserving bandwidth without requiring full cavity volume
Solution Approach 2:
Different regions within the cavity are assigned different properties through the use of intra-cavity walls with specific dimensions and positions. The walls create zones with different electromagnetic characteristics, allowing local optimization of field distribution and impedance matching in critical areas while reducing overall cavity volume, thus maintaining bandwidth efficiency
2Length of moving object
If cavity-backed patch radiators are used for flush mounting, then low profile is achieved, but cross-coupling between adjacent elements increases
Solution Approach 1:
Intra-cavity walls divide the cavity into separate compartments that electrically isolate adjacent antenna elements. This segmentation prevents electromagnetic field leakage between elements, reducing cross-coupling effects while maintaining the low-profile flush-mounted structure
Solution Approach 2:
The intra-cavity walls act as intermediary structures between adjacent antenna elements. These walls serve as electromagnetic barriers that block field interactions between elements, reducing cross-coupling while allowing the elements to remain in close proximity for array formation
3Area of stationary object
If surface waves are allowed to propagate, then radiation coverage is extended, but scan blindness occurs at certain angles
Solution Approach 1:
The intra-cavity walls extract or remove the harmful surface wave components from the electromagnetic field distribution. By blocking the propagation paths of surface waves along the cavity boundaries, the walls eliminate the cause of scan blindness while allowing space waves to continue providing radiation coverage
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 effectively increases cross-polarization isolation and gain, making the antenna array more robust and suitable for mobile platforms by minimizing back radiation and surface waves, while maintaining a low-profile design.
Implementation Method 1
An intra-cavity wall is disposed within the cavity between feed lines of the antenna feed network. The intra-cavity wall is provided having dimensions selected to reduce cross-coupling within the cavity.
Implementation Method 2
The cavity structure includes conductive walls defining an antenna element cavity. The walls have a height defining a depth of the cavity.
Data Source
AI summary
Described embodiments provide an antenna for transmitting and receiving radio frequency (RF) signals. The antenna includes an antenna element and an antenna feed network coupled to the antenna element. The antenna feed network is disposed on a first side of the antenna element. A cavity structure is disposed around the antenna feed network. The cavity structure includes conductive walls defining an antenna element cavity. The walls have a height defining a depth of the cavity. An intracavity wall is disposed within the cavity between feed lines of the antenna feed network. The intra-cavity wall is provided having dimensions selected to reduce cross-coupling within the cavity.