Compact Shielding Box for Antenna Testing with Narrow Interference Path
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Solution Overview
Problem
Conventional anechoic chambers used for testing antennas are excessively large, causing design inconvenience and inefficiency in reducing multipath interference.
Innovation Solution
A compact shielding box design comprising multiple interconnected boxes with absorption material and asymmetrical shapes, featuring a narrow connection path to minimize multipath interference between transmission and reception antennas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a conventional anechoic chamber is used to reduce multipath interference, then the multipath interference is reduced, but the space occupied becomes excessively large
Solution Approach 1:
The anechoic chamber is segmented into three separate boxes (first box for transmission antenna, second box for narrow connection path, third box for reception antenna). This segmentation allows each component to be optimized independently, with the second box specifically designed to provide a narrow connection path that reduces multipath interference while minimizing overall space requirements.
Solution Approach 2:
The first box and third box are designed with asymmetrical shapes rather than identical symmetrical forms. This asymmetry, combined with the narrow connection path in the second box, disrupts symmetrical reflection patterns that cause multipath interference, thereby reducing harmful reflections while maintaining a compact overall structure.
2Area of stationary object
If the anechoic chamber size is reduced for compactness, then space efficiency improves, but multipath interference reduction capability deteriorates
Solution Approach 1:
The second box serves as an intermediary component between the transmission and reception antennas. It provides a narrow connection path that acts as a controlled transition zone, allowing signal transmission while minimizing direct line-of-sight paths that would cause multipath interference. This intermediary structure enables compact sizing without sacrificing interference reduction capability.
Solution Approach 2:
The absorption material is selectively applied to specific surfaces within each box rather than uniformly throughout. The narrow connection path in the second box is specifically designed with appropriate absorption material placement to target and eliminate multipath interference in critical areas, achieving effective interference reduction in a compact configuration.
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 shielding box effectively suppresses multipath interference, reducing the overall size compared to conventional anechoic chambers and making it suitable for various production line applications while maintaining accurate antenna testing.
Implementation Method 1
The absorption material is distributed over the inner surfaces of the first box, the second box, and the third box, respectively
Data Source
AI summary
A shielding box for testing a transmission antenna and a reception antenna includes a first box, a second box, a third box, and an absorption material. The transmission antenna is positioned in the first box. The reception antenna is positioned in the third box. The absorption material is distributed over the inner surfaces of the first box, the second box, and the third box, respectively. The third box is connected through the second box to the first box. The second box provides a relatively narrow connection path for reducing the multipath interference between the transmission antenna and the reception antenna.