Base Station Antenna Reflector With Stub-Type Filtering
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Solution Overview
Problem
The existing base station antennas experience poor radiation performance due to induced currents on the reflector, leading to distortion of radiation patterns and reduced cross-polar discrimination, especially when high-frequency electromagnetic waves from the active module interact with the passive module's reflector, limiting the size reduction of the reflector without compromising the radiation pattern of the passive module.
Innovation Solution
Incorporating stub-type filtering structures, such as open or closed slots, into the reflector to inhibit induced currents within specific frequency bands, allowing the reflector to partially or completely block electromagnetic waves and improve radiation performance by reducing interference between the passive and active modules.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the size of the reflector is reduced, then the interference to the active module is reduced, but the radiation pattern of the passive module deteriorates
Solution Approach 1:
The reflector body is divided into different regions with different properties: the first region maintains good reflection performance for passive module signals, while the second region is designed with through-holes to allow transmission of active module signals. This local differentiation allows the reflector to simultaneously protect passive module radiation pattern while reducing interference to active module.
Solution Approach 2:
The reflector is segmented into multiple functional regions based on their different requirements: a first region for maintaining reflection performance and a second region for enabling signal transmission. This segmentation allows each region to be optimized independently for its specific function, resolving the contradiction between maintaining radiation pattern and reducing interference.
2Volume of stationary object
If the reflector is made smaller, then the space for active module is increased, but the induced current on the reflector cannot be fully eliminated
Solution Approach 1:
Different regions of the reflector are assigned different properties: the first region maintains continuous structure for good reflection, while the second region incorporates through-holes to block induced current paths. This allows the reflector to be compact while still eliminating induced currents through the strategic placement of transmission regions.
3Volume of stationary object
If the reflector size is reduced, then the overall antenna size is reduced, but the radiation pattern distortion increases
Solution Approach 1:
The reflector is divided into functional segments where the first region preserves radiation pattern quality through maintained reflection properties, while the second region enables compact size through transmission capabilities. This segmentation allows the antenna to be compact without sacrificing radiation pattern quality.
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 implementation of stub-type filtering structures effectively reduces induced currents, enhancing the radiation performance of the base station antenna by minimizing distortion and improving cross-polar discrimination, while allowing high-frequency waves to pass through, thus maintaining the integrity of the radiation pattern.
Implementation Method 1
at least one slot provided in the body, wherein the at least one slot is configured for forming at least one stub-type filtering structure in the body, and the stub-type filtering structure is configured for at least partially inhibiting an induced current in the body within an operating frequency band
Implementation Method 2
The reflector 13 acts to reflect electromagnetic waves that are emitted backwardly by the radiating element 115 in the forward direction
Data Source
AI summary
A reflector for a base station antenna comprises: a body; and at least one slot provided in the body, where the at least one slot is configured for forming at least one stub-type filtering structure in the body. The stub-type filtering structure is configured for at least partially inhibiting an induced current in the body within an operating frequency band of a radiating element mounted behind the reflector.