Dual-Polarized Antenna Feed With Low-Pass Filter for Multiband Arrays
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Solution Overview
Problem
Existing multiband antenna systems face performance degradation due to the feeding structure of low-band antenna elements affecting high-band antenna elements, and the adjustment of low-band antenna elements results in insufficient utilization of their volume.
Innovation Solution
An antenna system is designed with a dual-polarized radiating element and a low-pass filter structure that is electrically coupled via a coupling feeding line, allowing for improved feeding of the radiating element from a side region and optimizing the use of low-band antenna element volume.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If low-band antenna elements are positioned to adjust to high-band antenna elements in an interleaving design, then the high-band antenna performance is maintained, but the low-band antenna element volume utilization becomes insufficient
Solution Approach 1:
The patent transitions from planar geometries to three-dimensional folded dipole structures, enabling the low-band antenna elements to utilize the vertical dimension and space between substrate and reflector. This dimensional change allows full volume utilization without compromising high-band performance, as the folded structure achieves resonant length within the available three-dimensional space.
Solution Approach 2:
The low-band folded dipole antenna is nested within the space defined by the high-band antenna elements and the reflector substrate. The feeding structure is integrated into the existing array architecture, with the low-band elements positioned in the interstitial space, allowing both bands to coexist without mutual interference while maximizing space utilization.
2Device complexity
If a central feeding structure is used for low-band antenna elements, then the interleaving design is simplified, but the radiation pattern of high-band antenna elements degrades
Solution Approach 1:
The patent extracts the low-band feeding structure from the central position and relocates it to the edge of the substrate. This separation removes the harmful coupling between the low-band feeding structure and high-band antenna elements, eliminating the degradation of high-band radiation patterns while still enabling the interleaving design through the side-feeding approach.
Solution Approach 2:
The patent introduces a low-pass filter as an intermediary component in the feeding line between the edge-fed position and the low-band dipole antenna. This filter acts as a frequency-selective mediator that allows low-band signals to reach the antenna while blocking high-band frequencies, preventing high-band signal leakage and maintaining high-band radiation performance.
3Ease of manufacture
If planar geometries of cross-dipole arms are used, then the manufacturing is simplified, but the low-band radiator bandwidth becomes limited
Solution Approach 1:
The patent replaces planar straight dipole arms with folded configurations that incorporate curved and angled segments. This curvature and folding allow the antenna to achieve the required resonant electrical length within the constrained physical space, simultaneously maintaining manufacturing simplicity through standard PCB fabrication techniques while expanding the operational bandwidth through the folded geometry's resonant characteristics.
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 enhances the performance of low-band antenna elements while maintaining transparency to high-band elements, achieving improved bandwidth and reduced mechanical conflicts in multiband antenna arrays.
Implementation Method 1
a low-pass filter structure extending generally in a second direction perpendicular or substantially perpendicular to the reflector of the antenna system
Implementation Method 2
a coupling feeding line which electrically couples, via a region which comprises an end portion of the dual-polarized radiating element, the low-pass filter structure with the center portion of the dual-polarized radiating element
Implementation Method 3
The dual-polarized radiating element is configured to emit an electromagnetic wave
Data Source
AI summary
We generally describe an antenna system comprising a dual-polarized radiating element extending generally in a first direction parallel or substantially parallel to a reflector of the antenna system. The dual-polarized radiating element is configured to emit an electromagnetic wave. The antenna system further comprises a low-pass filter structure extending generally in a second direction perpendicular or substantially perpendicular to the reflector of the antenna system. The low-pass filter structure is spaced apart, in relation to the first direction, from a center portion of the dual-polarized radiating element. The antenna system further comprises a coupling feeding line which electrically couples, via a region which comprises an end portion of the dual-polarized radiating element, the low-pass filter structure with the center portion of the dual-polarized radiating element for feeding an electrical signal via the low-pass filter structure through the coupling feeding line to the center portion of the dual-polarized radiating element.