Low-Frequency Filtering Radiating Element for Compact Base Station Arrays
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Solution Overview
Problem
Existing low-frequency radiating elements in multi-band integrated antennas are large in size, affecting high-frequency performance and requiring significant space, while traditional integration methods either have fixed formations with poor performance or flexible formations with poor indices.
Innovation Solution
A low-frequency filtering radiating element with centrosymmetrically distributed dipole arms in orthogonal polarization, featuring ±45° polarized radiating elements, feeder baluns, filtering stubs, and inductive stubs to enhance performance and reduce space requirements, integrated with high-frequency elements in a base station antenna.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If low-pass filters are used to remove harmonics in base station antennas, then signal quality is improved, but the antennas become unsuitable for low-frequency applications due to inherent low-frequency filtering
Solution Approach 1:
The antenna element is divided into multiple sections with different geometries. The first section has a first geometry optimized for low-frequency operation, while the second section has a second geometry that provides low-pass filtering. This segmentation allows each section to fulfill its specific function independently, resolving the contradiction between low-frequency suitability and harmonic suppression.
Solution Approach 2:
Different parts of the antenna element are given different local properties. The first section is designed with specific geometric characteristics for low-frequency resonance, while the second section is designed with filtering characteristics. This local differentiation enables the antenna to simultaneously achieve low-frequency operation and harmonic rejection without compromising overall performance.
2Ease of manufacture
If conventional antenna designs are used, then manufacturing is simple, but electromagnetic compatibility problems arise due to insufficient harmonic suppression
Solution Approach 1:
The antenna element combines multiple geometric sections in a single continuous structure, merging the low-frequency radiating function with the harmonic filtering function. This integrated design achieves electromagnetic compatibility without requiring separate filtering components, maintaining manufacturing simplicity while suppressing harmful harmonics.
Solution Approach 2:
The second section of the antenna element acts as an intermediary structure that provides low-pass filtering between the feed point and the radiating first section. This intermediary geometry suppresses harmonics generated at the feed point before they can radiate, solving electromagnetic compatibility issues without complex additional components.
3Object-affected harmful factors
If additional filtering components are added to suppress harmonics, then electromagnetic compatibility is improved, but device complexity increases
Solution Approach 1:
The antenna element is designed as a multi-functional structure where the second section serves dual purposes: it acts as both a structural support element and a low-pass filter. This universal design eliminates the need for separate filtering components, reducing device complexity while maintaining effective harmonic suppression.
Solution Approach 2:
The antenna element's own geometry is configured to provide filtering functionality. The second section's specific geometric properties enable it to automatically suppress harmonics without requiring external filtering components. This self-service approach reduces overall system complexity while achieving the required electromagnetic compatibility.
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 provides improved radiation performance, stable array stability, reduced installation area, and flexible array configurations, minimizing interference and space occupation while maintaining high-frequency performance.
Implementation Method 1
a first section (110) of the antenna element (100) is configured to radiate signals at a fundamental frequency
Implementation Method 2
a second section (120) of the antenna element (100) is configured to filter signals having frequencies above the fundamental frequency
Data Source
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AI summary
The present application provides a low-frequency filtering radiating element and a base station antenna, where the low-frequency filtering radiating element includes: a substrate, which includes a first mounting surface and a second mounting surface arranged opposite; and a low-frequency radiating element, which includes four pairs of dipoles distributed on the substrate centrosymmetrically, where the four pairs of dipoles are distributed in orthogonal polarization to form two groups of ±45° polarized radiating elements, each pair of dipoles includes two radiation arms arranged on the first mounting surface and the second mounting surface respectively, and the two radiation arms are arranged in a mirror mode.