Loop-Shaped Low-Band Radiator Layout for Antenna Isolation
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Solution Overview
Problem
The development of multi-broadband antennas is hindered by interference between low-band and high-band radiators, which distort the radiation pattern of high-band radiators due to their close proximity and limited space, necessitating a solution that minimizes radiator size and improves isolation.
Innovation Solution
A low-band radiator design featuring loop-shaped dipole arms with meander lines and stubs, coupled with a balun portion, and spaced apart from high-band radiators, along with parasitic patches to enhance isolation and reduce interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple radiators of different types are arranged overlapped to cover different bands within a limited space, then the antenna can achieve multi-broadband coverage, but interference between radiators occurs and distorts the radiation pattern
Solution Approach 1:
The patent applies dimensionality change by transitioning from a planar two-dimensional arrangement to a three-dimensional spatial configuration. The low-band radiator is positioned at a predetermined distance behind the high-band radiator, utilizing the depth dimension to separate the radiation patterns and reduce interference while maintaining compact overall dimensions.
Solution Approach 2:
The patent implements nesting by placing the low-band radiator within the spatial envelope defined by the high-band radiator's support structure. The low-band radiator is positioned in the region behind the high-band radiator, effectively nesting multiple frequency band coverage within a single compact antenna housing.
2Volume of moving object
If the low-band radiator is placed close to the high-band radiator, then the antenna size is reduced, but the low-band radiator interferes with the high-band radiator and distorts its radiation pattern
Solution Approach 1:
The patent resolves this contradiction by utilizing the depth dimension (distance from the reflector) to separate the radiators. The low-band radiator is positioned at a predetermined distance behind the high-band radiator, allowing compact lateral dimensions while maintaining sufficient separation to preserve radiation pattern stability.
3Volume of moving object
If the physical size of the low-band radiator is miniaturized, then the overlap area with the high-band radiator is minimized, but manufacturing complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the low-band radiator into multiple conductive elements or segments. This segmentation allows the radiator to achieve resonant dimensions suitable for low-band frequencies while maintaining a compact overall footprint that minimizes overlap with the high-band radiator.
Data Source
AI summary
A low-band radiator comprises: a radiation substrate; a first dipole radiation portion formed from a conductor line on one surface of the radiation substrate and comprising two first loop arms each having the length extending in a predetermined first direction and formed in a loop shape having one end open; a second dipole radiation portion formed from a conductor line on one surface of the radiation surface, comprising two second loop arms each having the length extending in a predetermined second direction and formed in a loop shape having one end open, and disposed so as to intersect the first dipole radiation portion; and a balun portion coupled to the other surface of the radiation substrate and applying power feeding signals, respectively corresponding to the first and second loop arms, to two open ends of the loops.