Nested Dipole Array Layout for Compact Multi-Band Antennas
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Solution Overview
Problem
Existing antenna devices face challenges in supporting both low-frequency and high-frequency services on the same radio infrastructure without significant mechanical constraints and interference, limiting the ability to add new services on existing pylons.
Innovation Solution
The proposed antenna device features a low-frequency array and a high-frequency array with vertically nested dipoles, supported by a main and auxiliary mast structure, incorporating decoupling devices like coaxial low-pass filters and quarter-wave traps to minimize coupling and reduce the overall height, allowing for the coexistence of multiple frequency bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the low-frequency array is positioned at the top of the pylon to preserve quasi-symmetrical radiation, then the radiation pattern is improved, but the height of the support increases and new services at higher frequencies cannot be added
Solution Approach 1:
The patent applies nesting by positioning the high-frequency array vertically within the space occupied by the low-frequency array. The high-frequency dipoles are arranged in multiple vertical groups that are nested between the low-frequency dipoles, allowing both arrays to coexist in a compact vertical configuration while maintaining the quasi-symmetrical radiation pattern and avoiding increased support height
Solution Approach 2:
The patent transitions from a single-vertical-dimension arrangement to a multi-dimensional configuration by distributing high-frequency dipoles in multiple vertical groups at different horizontal positions around the pylon. This spatial distribution in multiple dimensions allows both frequency arrays to coexist without increasing the overall support height while maintaining radiation symmetry
2Object-generated harmful factors
If the high-frequency array is placed above the low-frequency array on the mast, then coupling between arrays is limited, but the mast height becomes very high imposing strong mechanical constraints
Solution Approach 1:
The patent implements nesting by placing the high-frequency array vertically within the low-frequency array's spatial envelope. Multiple vertical groups of high-frequency dipoles are positioned between the low-frequency dipoles, achieving compact integration that reduces mast height while maintaining array isolation through strategic spacing and orientation
Solution Approach 2:
The high-frequency array is segmented into multiple vertical groups distributed around the pylon. This segmentation allows the high-frequency dipoles to be positioned at different vertical and horizontal locations, reducing coupling with the low-frequency array while maintaining a compact overall structure that avoids excessive mast height
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 enables efficient coexistence of low-frequency and high-frequency services, reducing interference and mechanical constraints, allowing for the addition of new services without increasing the antenna's height, while maintaining quasi-symmetrical radiation patterns.
Implementation Method 1
The decoupling device is a coaxial low-pass filter arranged at the input of the low-frequency array
Implementation Method 2
for each low-frequency dipole, at least one quarter-wave trap arranged around a leg of the low-frequency dipole
Data Source
AI summary
The invention relates to an antenna device (102) comprising a low-frequency array (104) of low-frequency dipoles (112) having respective centres (112c) aligned on a so-called vertical axis (A1): a high-frequency array (106) of high-frequency dipoles (114) having respective centres (114c) following one another vertically; and a support (115) for the low-frequency dipoles (112) and the high-frequency dipoles (114). The device is characterised in that the high-frequency dipoles (114) are arranged so that the centre (112c) of each low-frequency dipole (112) is positioned vertically between the centres (114c) of a pair (P1: P2) of two high-frequency dipoles (114).