Base Station Radiating Element With AMC Reflection for Narrower Beams
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Solution Overview
Problem
Conventional base station antennas face challenges in achieving a narrower beam width and higher beam directivity due to the 180-degree phase shift caused by perfect electric conductor reflectors, limiting their performance and size optimization.
Innovation Solution
Incorporating an artificial magnetic conductor (AMC) structure below the radiator to enable in-phase reflection of electromagnetic waves, allowing the radiator to be positioned closer to the reflector, thus reducing the separation distance and enabling constructive interference for improved gain and miniaturization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a perfect electric conductor reflector is used in conventional base station antennas, then the reflector can provide stable reflection, but it causes a 180-degree phase shift that limits beam directivity and beam width optimization
Solution Approach 1:
The patent changes the reflection phase parameter from 180 degrees (conventional PEC reflector) to 0 degrees (AMC structure), fundamentally altering the electromagnetic boundary condition. This parameter change enables constructive interference between direct and reflected waves, improving beam directivity and narrowing beam width without sacrificing reflection stability
Solution Approach 2:
The patent employs an artificial magnetic conductor structure that combines conductive materials with specific geometric patterns (such as periodic metallic patches or resonant elements) to achieve magnetic conductor behavior. This composite structure provides both stable reflection and in-phase reflection characteristics, resolving the contradiction between reliability and beam shape control
2Length of stationary object
If the radiator is positioned closer to the reflector to reduce antenna profile, then the antenna size is reduced, but conventional reflectors cause phase cancellation that degrades gain and directivity
Solution Approach 1:
By changing the reflection phase parameter to 0 degrees through AMC structure, the patent enables the radiator to be positioned very close to the reflector (distance much less than λ/4) without causing phase cancellation. The in-phase reflection creates constructive interference that maintains high gain and directivity even at reduced separation distances, achieving both compact size and high performance
3Ease of manufacture
If conventional reflector designs are used, then the structure is simple and easy to manufacture, but the beam directivity and frequency stability cannot be optimized
Solution Approach 1:
The AMC structure uses composite materials with periodic metallic patterns embedded in dielectric substrates, which can be manufactured using standard PCB fabrication techniques. This approach maintains ease of manufacture while achieving precise control over reflection phase and amplitude, thereby optimizing beam directivity and frequency stability through material composition rather than complex geometry
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 AMC structure enhances beam directivity and gain while reducing the antenna's profile, resulting in a narrower beam width and better frequency stability.
Implementation Method 1
an artificial magnetic conductor (AMC) structure mounted below the radiator, configured to enable the electromagnetic radiation within the operating frequency band to be in-phase reflected
Data Source
AI summary
The present disclosure relates to a radiating element for a base station antenna, including: a feeding balun; a radiator mounted at a top of the feeding balun, configured to emit an electromagnetic radiation within an operating frequency band of the radiating element; and an artificial magnetic conductor (AMC) structure mounted below the radiator, configured to enable the electromagnetic radiation within the operating frequency band to be in-phase reflected, where a distance between the AMC structure and a bottom of the radiator is less than 1/10 of a height of the feeding balun. The present disclosure further relates to a base station antenna.