Multiband Base Station Antenna Choke Layout for Beamwidth Isolation
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Solution Overview
Problem
Miniaturized base station antennas experience strong interference between radiators, leading to distorted beam width and deteriorated isolation characteristics, which affect communication quality.
Innovation Solution
A multi-band base station antenna design incorporating vertical and horizontal choke members with meander lines on substrates, positioned to minimize interference between radiators, using a reflective plate with specific radiator arrangements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If radiators are arranged at narrow intervals to meet miniaturization requirements, then antenna size is reduced, but isolation characteristics deteriorate and beam width distorts
Solution Approach 1:
Choke members are introduced as intermediary structures between adjacent radiators to block electromagnetic coupling. These choke members consist of conductive walls with narrow slots that allow controlled signal passage while preventing harmful interference, thus maintaining isolation characteristics even when radiators are positioned at narrow intervals for miniaturization
Solution Approach 2:
The solution adds a vertical dimension to the radiator arrangement by stacking multiple radiator layers at different heights. This three-dimensional configuration allows radiators to be positioned closer in the horizontal plane for miniaturization while maintaining isolation through vertical separation and the use of choke members between layers
2Volume of moving object
If radiators are arranged at narrow intervals to meet miniaturization requirements, then antenna size is reduced, but beam width distorts
Solution Approach 1:
Choke members serve as intermediary structures that prevent electromagnetic fields from adjacent radiators from interfering with each other. By blocking the coupling between radiators positioned at narrow intervals, the choke members prevent beam width distortion while allowing the antenna to maintain a compact size
Solution Approach 2:
The choke members are strategically positioned only in specific locations where interference occurs between adjacent radiators. The conductive walls with narrow slots provide localized interference suppression, allowing the beam width to maintain its intended shape pattern while the antenna overall remains miniaturized
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
Prevents beam width distortion and secures good isolation characteristics between radiators, maintaining optimal communication performance.
Implementation Method 1
a plurality of vertical choke members arranged, between the first column and the second column, in the direction parallel to that of the first column and the second column, wherein the vertical choke members comprise a first substrate, a meander line is formed on the first substrate, and a metal line is formed under the first substrate
Data Source
AI summary
A multiband base station antenna having improved beamwidth is disclosed. The disclosed antenna comprises: a reflective plate; a plurality of first low-band radiators arranged on the reflective plate along a first column; a plurality of second low-band radiators arranged on the reflective plate along a second column, which is parallel to the first column and is spaced from the first column; a plurality of high-band radiators arranged on the reflective plate; and a plurality of vertical choke members arranged, between the first column and the second column, in the direction parallel to that of the first column and the second column, wherein the vertical choke members comprise a first substrate, a meander line is formed on the first substrate, and a metal line is formed under the first substrate. According to the disclosed antenna, beamwidth distortion of each radiator, caused by interference between the radiators, can be prevented, and proper isolation characteristics between the radiators can be ensured.