Spiral-Slit Tubular Antenna Element for 4G/5G Interference Filtering
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Solution Overview
Problem
The integration of 4G and 5G antennas in an array leads to severe interference due to radiation unit interactions, causing beam deformation and inadequate coverage, with existing band-stop filters introducing discontinuities that limit bandwidth and affect matching.
Innovation Solution
A tubular antenna element with a spiral slit around its periphery and a support column connected to antenna elements, allowing for simultaneous radiation of high-frequency and low-frequency signals while minimizing interference through a continuous filtering structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a band-stop filter is inserted on an arm of a low-frequency radiation unit, then high-frequency current suppression is improved, but bandwidth is reduced due to introduced discontinuities
Solution Approach 1:
The tubular antenna element is segmented by introducing a spiral slit that winds around the tube, dividing the continuous structure into a controlled spiral path. This segmentation allows the structure to selectively support low-frequency currents along the spiral path while blocking high-frequency currents, achieving filtering without discrete components that would limit bandwidth.
Solution Approach 2:
The filtering function is achieved by transitioning from a one-dimensional linear filter insertion to a two-dimensional spiral geometry wrapped around the antenna element. This dimensional change allows the filter to be integrated into the radiation element itself, maintaining continuity and broadband performance while providing frequency selectivity.
2Object-affected harmful factors
If several independent filter structures are loaded, then high-frequency interference suppression is improved, but matching between oscillators is affected and broadband operation becomes difficult
Solution Approach 1:
The filtering function and radiation function are merged into a single integrated structure. The spiral slit is directly formed in the tubular antenna element, combining the radiating element and the filter into one continuous component. This eliminates the need for separate filter structures and their associated discontinuities, maintaining broadband matching while providing interference suppression.
Solution Approach 2:
The tubular antenna element with spiral slit serves multiple functions simultaneously: it acts as the radiating element for low-frequency signals, provides frequency-selective filtering to block high-frequency currents, and maintains continuous broadband matching. This multi-functionality eliminates the need for separate dedicated filter components.
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
The solution achieves a larger bandwidth, maximizes high-frequency current suppression, and minimizes low-frequency current interference, enabling simultaneous transmission of both signal types without volume increase, thus improving antenna integration and performance.
Implementation Method 1
a radiation unit of the 4G antenna causes severe interference to a radiation unit of the 5G antenna... a band-stop filter on an arm of a low-frequency radiation unit, to effectively suppress an induced current generated by a high-frequency electromagnetic wave
Data Source
AI summary
An antenna element with a filtering function, a filtering radiation unit, and an antenna. The antenna element is tubular, with a spiral slit arranged around the periphery of the tubular antenna element and extending in an axial direction. The filtering radiation unit includes a support column, and an upper part of the support column is electrically connected to at least one antenna element. The antenna includes a reflecting plate, and at least one filtering radiation unit is fixedly arranged on the reflecting plate. The antenna element with a filtering function has functions of radiating signals and suppressing interference simultaneously. The filtering radiation unit can cooperate with a high-frequency radiation element during use to achieve the aim of radiating a high-frequency signal and a low-frequency signal simultaneously. The antenna is good in performance, small in size, and high in integration degree.