Multi-Band Base Station Antenna Coupler Layout for Radiator Isolation
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Solution Overview
Problem
Conventional multi-band base station antennas suffer from performance degradation due to unnecessary radiation from high-band radiators to low-band radiators, leading to interference and reduced efficiency.
Innovation Solution
The proposed multi-band base station antenna incorporates a low-band radiator design with a metal coupler and coupling arms to enhance isolation between low-band and high-band radiators, utilizing a radiation substrate with dipole radiators and auxiliary arms to minimize signal interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a low-band radiator and a high-band radiator coexist in a multi-band base station antenna, then multi-band radiation characteristics are achieved, but the high-band radiator induces RF signals to the low-band radiator causing performance degradation
Solution Approach 1:
A metal coupler is introduced as an intermediary component between the low-band radiator and high-band radiator. The metal coupler includes coupling patches that are electromagnetically coupled to both the low-band dipole radiator and the high-band radiator, serving as a mediator to manage the interaction between the two radiators and suppress unwanted signal induction.
Solution Approach 2:
The patent converts the harmful electromagnetic coupling effect into a beneficial isolation mechanism. By designing the metal coupler with specific coupling patches positioned below the low-band radiator, the harmful induction from the high-band radiator is transformed into a controlled coupling that actually improves isolation characteristics and suppresses unwanted radiation.
2Device complexity
If a conventional low-band radiator structure is used, then the structure is simple, but isolation between low-band and high-band radiators is poor
Solution Approach 1:
The low-band radiator is segmented into distinct functional components: a dipole radiator structure and a separate metal coupler with multiple coupling patches. This segmentation allows each component to perform its specific function - the dipole for radiation and the coupler for isolation - thereby improving overall isolation characteristics while maintaining reasonable structural complexity.
Solution Approach 2:
The metal coupler is positioned in the vertical dimension below the low-band radiator, creating a three-dimensional isolation structure. By adding this vertical dimension to the isolation mechanism, the patent effectively suppresses harmful electromagnetic coupling from the high-band radiator without significantly increasing horizontal structural complexity.
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 design effectively secures good isolation between low-band and high-band radiators, stabilizing the standing wave ratio characteristics and improving the overall performance of the multi-band base station antenna.
Implementation Method 1
a first+coupling arm formed on the lower portion of the radiation substrate and formed at a position where electromagnetic coupling is possible with the first+dipole arm; a first−coupling arm formed on the lower portion of the radiation substrate and formed at a position where electromagnetic coupling with the first−dipole arm is possible
Data Source
AI summary
A multi-band base station antenna comprises: a reflector; a plurality of high-band radiators arranged on the reflector; and a plurality of low-band radiators arranged on the reflector. Each of the plurality of low-band radiators comprises: a radiation substrate; a first dipole radiator including a first+dipole arm and a first−dipole arm formed on the radiation substrate; a second dipole radiator including a second+dipole arm and a second−dipole arm formed on the radiation substrate; and a metal coupler coupled to the lower portion of the radiation substrate. The metal coupler comprises: a first coupling patch located below the first+dipole arm; a second coupling patch located below the first−dipole arm; a third coupling patch located below the second+dipole arm; and a fourth coupling patch located below the second−dipole arm.