Dipole Radiating Element Loops for Multi-Band Coupling Suppression
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Solution Overview
Problem
In cellular communications systems, the increased number of frequency bands leads to significant signal coupling interference between linear arrays of radiating elements, affecting radiation pattern characteristics, and altering the operating frequency band of low-band radiating elements when attempting to suppress high-band or mid-band currents.
Innovation Solution
A radiating element design featuring a dipole arm with a first conductive circuit loop and a second conductive circuit loop, where the first loop includes narrow and wide conductive segments to suppress currents outside the operating frequency band, and a second resonance circuit to improve RF performance by balancing current distribution across the frequency band.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If linear arrays of radiating elements are aligned closer together to increase capacity, then the number of frequency bands served increases, but signal coupling interference between arrays increases significantly
Solution Approach 1:
A ground plane structure is introduced as an intermediary between the low-band radiating element and mid-band radiating elements. This ground plane acts as a shield to block electromagnetic coupling between the arrays, reducing interference while allowing both arrays to operate in close proximity to serve multiple frequency bands
2Object-affected harmful factors
If the dimension of low-band radiating elements is changed to suppress high-band currents, then coupling interference is reduced, but the radio frequency performance of low-band radiating elements is affected
Solution Approach 1:
The low-band radiating element is segmented into multiple conductive segments along its length. By dividing the continuous element into discrete segments, the design can suppress currents at specific frequencies (high-band and mid-band) while maintaining proper resonance and radiation characteristics in the operating low-band frequency range
Solution Approach 2:
Different segments of the low-band radiating element are designed with different electrical characteristics. Specifically, certain segments have dimensions or configurations that create high impedance at non-operating frequencies to suppress unwanted currents, while other segments maintain low impedance to ensure proper current flow and radiation at the operating frequency
3Adaptability or versatility
If multiple linear arrays of radiating elements are used to support service in different frequency bands, then multi-band capability is achieved, but the number of base station antennas increases
Solution Approach 1:
Multiple radiating elements with different frequency capabilities are merged into a single integrated base station antenna structure. The low-band radiating element and mid-band radiating elements are positioned in close proximity and fed by a common feed network, combining multiple frequency band capabilities into one antenna unit rather than requiring separate antennas for each band
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 design effectively reduces signal coupling interference and maintains stable RF performance within the operating frequency band by suppressing unwanted currents and optimizing current distribution, thereby enhancing the radiation pattern characteristics of multi-band radiating elements.
Implementation Method 1
The narrow conductive segment may exhibit high impedance characteristics in at least one frequency band outside an operating frequency band of the radiating element so as to at least partially suppress currents in the at least one frequency band
Implementation Method 2
a dipole arm of the radiating element may include a first conductive circuit loop and a second conductive circuit loop
Data Source
AI summary
A radiating element may have a dipole arm that may include a first conductive circuit loop and a second conductive circuit loop. The first conductive circuit loop may include at least one narrow conductive segment and at least one wide conductive segment, and the narrow conductive segment may present high impedance characteristics in at least one frequency band outside the operating frequency band of the radiating element to suppress at least partially the current in the at least one frequency band. A base station antenna may include a feed board and the radiating element mounted on the feed board.