Balun Element With LC Resonant Decoupling for Dual-Polarization Antennas
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Solution Overview
Problem
In multi-frequency multi-array antenna systems, electromagnetic coupling between radiating elements on different frequency bands leads to poor manufacturability and difficulty in implementing layouts where one radiating element corresponds to multiple elements, affecting the normal operation of antennas.
Innovation Solution
The antenna element incorporates a balun element with two dielectric plates embedded in a crossing manner, featuring signal transmission, feeding, and filtering units for decoupling, which reduces electromagnetic coupling by using an LC resonant energy storage structure to store energy sensed by one frequency band and prevent its participation in radiation, ensuring normal operation across different frequency bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If radiating elements on different frequency bands are arranged closely to increase system capacity, then productivity and space utilization are improved, but electromagnetic coupling between elements increases causing antennas to fail normal operation
Solution Approach 1:
The patent introduces an independent balun element as an intermediary component between radiating elements on different frequency bands. This balun element includes filtering units that act as mediators to suppress electromagnetic coupling, allowing closely arranged radiating elements to operate normally without mutual interference
2Object-generated harmful factors
If a decoupling circuit is integrated with the feeding structure in the prior art, then decoupling function is provided, but the working status of radiating elements is affected and electrical properties deteriorate
Solution Approach 1:
The patent segments the decoupling function from the feeding structure by placing filtering units on an independent balun element rather than integrating them into the feeding structure. This separation prevents the decoupling circuit from affecting the working status and electrical properties of radiating elements while still providing effective electromagnetic coupling suppression
3Object-generated harmful factors
If isolation is used to improve decoupling between elements, then electromagnetic coupling is reduced, but implementation complexity increases and manufacturability deteriorates
Solution Approach 1:
The patent creates a universal balun element structure that simultaneously provides multiple functions: impedance transformation, decoupling through filtering units, and mechanical support. This multi-functional design simplifies implementation compared to separate isolation structures while maintaining effective decoupling performance across different frequency bands
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 effectively reduces electromagnetic coupling between high-frequency and low-frequency radiating elements, allowing the antenna to function normally even when elements on different frequency bands are closely arranged, enhancing manufacturability and reducing interference.
Implementation Method 1
an LC resonant energy storage structure to store energy sensed by one frequency band and prevent its participation in radiation
Data Source
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AI summary
Antenna elements (101, 102) used for multi-band antenna dual polarization include: four radiating elements (201), a balun element configured to feed power to the radiating elements (201), and a fastening plate (202) configured to fasten the balun element. The balun element includes two dielectric plates (203). Two signal transmission units (301), one feeding unit (401), and two filtering units (402) are printed on each dielectric plate (203). An LC resonant energy storage structure is constructed on the balun element by using the filtering units (402), and decoupling on a specific frequency band can be implemented by adjusting the filtering unit (402). Therefore, even if the antenna elements (101, 102) are applied to a scenario in which elements on different frequency bands work collaboratively, radiating elements (201) on different frequency bands are not coupled electromagnetically and strongly when the radiating elements are arranged closely, so that the antenna elements (101, 102) can ensure normal working of an antenna on a related frequency band.