Double-Layer Director Structure for Stable Multi-Frequency Antenna Arrays
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Multi-port broadband base station antennas face performance issues due to resonance when increasing the number or size of directors, leading to radiation pattern distortion and interference between antenna arrays.
Innovation Solution
A double-layered director configuration with a dielectric substrate and split copper foils arranged around a center, weakening resonant current influence on high-frequency radiation units and reducing coupling between high and low-frequency arrays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If the number or size of directors is increased to improve radiation directionality, then the antenna width can be reduced, but resonance occurs affecting antenna performance
Solution Approach 1:
The director is divided into multiple director elements (first director and second director) arranged in sequence. This segmentation allows the antenna to achieve the desired radiation directionality while preventing resonance by distributing the electromagnetic interaction across multiple smaller elements rather than using a single large director
Solution Approach 2:
The patent transitions from a single-plane director configuration to a multi-layer spatial arrangement with directors positioned at different heights and horizontal locations. This dimensional expansion enables control of radiation patterns without increasing the horizontal footprint, thereby avoiding resonance issues while maintaining directionality
2Area of stationary object
If multi-port broadband base station antennas are used to form more antenna arrays, then the antenna width is reduced, but the distance between antenna arrays decreases increasing mutual influence
Solution Approach 1:
The antenna system is segmented into multiple independent antenna elements with controlled spacing. By dividing the overall array into discrete units with optimized individual patterns, the patent reduces mutual coupling effects while maintaining compact dimensions
Solution Approach 2:
Each antenna element is designed with specific local characteristics including directional radiation patterns and impedance matching optimized for its position. This local optimization minimizes interference between adjacent elements while maintaining overall array performance
3Length of stationary object
If directors are added to realize radiation in normal direction, then antenna width is reduced by increasing array height, but resonance occurs during operation
Solution Approach 1:
The director structure is segmented into multiple smaller director elements positioned at different heights. This segmentation prevents the formation of resonant currents by ensuring that no single element is large enough to support half-wave resonance, while collectively they provide the desired radiation directionality
Solution Approach 2:
The patent employs a design where director elements can be independently adjusted in position and orientation. This dynamic capability allows optimization of the radiation pattern while avoiding fixed resonant conditions that would occur with static, oversized directors
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
This configuration stabilizes the radiation pattern and gain within the operating frequency band by minimizing resonance and interference, ensuring consistent horizontal half-power beamwidth and gain.
Implementation Method 1
Use of the parasitic effect between the director and the radiating unit can make the antenna radiation wave radiate in the normal radiation direction
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A double-layered director includes a first director and a second director installed above the first director, and the second director includes a dielectric substrate and a split copper foil installed on the dielectric substrate. The present invention arranges a split copper foil on the dielectric substrate. This not only weakens the influence of the resonant current of the director on the high-frequency radiation unit itself, but also simplifies the boundary of the radiation unit, and reduces the coupling and mutual interference between the high-frequency and low-frequency radiation units, and avoids the superposition of scattered waves.