Triangular Low-Frequency Oscillator Arm for Antenna Isolation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In multi-frequency antenna arrays, the long low-frequency oscillator arms often shield high-frequency oscillator units, leading to increased coupling between frequency bands and impeded electromagnetic wave radiation.
Innovation Solution
The design of low-frequency oscillator arms is improved to a triangular structure with two radiating sections and a connecting section, forming a closed loop, which reduces shielding and mutual coupling by making the arms perpendicular to each other and optimizing polarization, thereby expanding coverage and structural strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the low-frequency oscillator arm is placed at oblique angles (plus and minus 45 degrees) on the metal reflector, then the polarization direction can be achieved, but the long low-frequency oscillator arm shields the high-frequency oscillator, increasing coupling between frequency bands
Solution Approach 1:
The patent changes the planar oblique arrangement (2D) to a three-dimensional structure where the low-frequency oscillator arm is bent into a folded configuration with multiple segments arranged at different heights and angles. This spatial redistribution in the third dimension (vertical direction) allows the oscillator to achieve the required polarization while reducing overlap and shielding of the high-frequency oscillator in the horizontal plane.
Solution Approach 2:
The low-frequency oscillator arm is divided into multiple segments (first, second, third, and fourth oscillating arms) connected in sequence. Each segment is positioned at different angles and heights relative to the metal reflector. This segmentation allows the oscillator to achieve the required electrical length and polarization characteristics while distributing the physical space occupation, thereby reducing shielding of the high-frequency oscillator.
2Reliability
If the low-frequency oscillator arm is made longer to achieve the required frequency, then the polarization performance is improved, but the shielding effect on the high-frequency oscillator increases
Solution Approach 1:
Instead of extending the oscillator arm horizontally which would increase shielding, the patent utilizes the vertical dimension by folding the oscillator arm at different heights above the metal reflector. The first and third segments are positioned at different vertical levels, allowing the oscillator to achieve the required electrical length and polarization performance without increasing horizontal footprint and shielding of the high-frequency oscillator.
Solution Approach 2:
The low-frequency oscillator arm employs an asymmetric folded configuration where segments are positioned at different angles and heights. The first oscillating arm is positioned at a first angle, the second at a second angle, creating an asymmetric three-dimensional structure that optimizes polarization performance while minimizing shielding through unequal spatial distribution of the oscillator segments.
3Area of stationary object
If the oscillator arms are arranged in parallel at plus and minus 45 degrees, then the multi-frequency antenna array can be compact, but the coupling between high and low frequency bands increases
Solution Approach 1:
The patent transitions from a two-dimensional parallel arrangement to a three-dimensional folded configuration. The low-frequency oscillator arm is arranged with segments at different vertical heights and angular positions, creating spatial separation in the third dimension. This allows the antenna array to maintain a compact horizontal footprint while reducing electromagnetic coupling between frequency bands through vertical and angular separation.
Solution Approach 2:
The folded low-frequency oscillator arm structure allows the oscillator to be arranged in a nested-like configuration where segments are positioned at different vertical levels. The first, second, third, and fourth oscillating arms are arranged in sequence at different heights and angles, creating a compact three-dimensional structure that fits within a small horizontal area while minimizing mutual coupling through vertical separation.
Data Source
AI summary
An antenna oscillator unit includes a radiator and a balun support. The radiator is fixed to the balun support and includes a plurality of low-frequency oscillator arms circumferentially distributed along the balun support. Each of the low-frequency oscillator arms includes two radiating sections connected to each other and a connecting section connecting the two radiating sections to form a closed loop. The two radiating sections are substantially perpendicular to each other. The antenna oscillator unit of some embodiments can avoid mutual coupling of signals from the antenna oscillator unit and an adjacent high-frequency oscillator and can improve the capability to radiate electromagnetic signals.