Parasitic Radiator Dipole Structure for Multi-Band Antenna Decoupling
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Solution Overview
Problem
In multi-band antennas, radiating elements in different frequency bands interfere with each other, causing scattering effects that affect the performance of antenna beams, and the introduction of chokes to inhibit interference negatively impacts impedance matching and radiation performance.
Innovation Solution
A radiating element design incorporating a dipole arm and a parasitic radiator, where the parasitic radiator induces a current that cancels out the induced current on the dipole arm in a higher frequency band, reducing interference and maintaining optimal radiation performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a choke is introduced on the dipole arm to inhibit mid-band current, then scattering effects on mid-band radiating elements are reduced, but the radiation performance of low-band radiating elements deteriorates due to increased impedance and radiation loss
Solution Approach 1:
The radiating element is segmented into distinct functional portions: a low-band radiating element for low-frequency operation and a mid-band radiating element for mid-frequency operation. Each portion is optimized independently, with the low-band element designed without chokes to maintain radiation efficiency while the mid-band element is positioned to minimize scattering effects.
Solution Approach 2:
A decoupling structure is introduced as an intermediary component between the low-band and mid-band radiating elements. This decoupling structure acts as a mediator to reduce mutual coupling and scattering effects between the two frequency bands without degrading the radiation performance of the low-band element.
2Adaptability or versatility
If multiple frequency bands are supported using separate linear arrays, then service coverage is expanded, but the number of base station antennas increases beyond deployment limits
Solution Approach 1:
The base station antenna is designed with multi-functionality to support multiple frequency bands (low-band and mid-band) within a single antenna structure. The antenna includes both low-band radiating elements and mid-band radiating elements, allowing one antenna to perform the function of multiple separate antennas and enabling deployment in locations with antenna quantity limitations.
3Adaptability or versatility
If low-band and mid-band radiating elements are mounted side-by-side, then multi-band functionality is achieved, but mutual interference occurs affecting beam width and antenna performance
Solution Approach 1:
A decoupling structure is positioned between the low-band radiating element and the mid-band radiating element to reduce mutual coupling and scattering effects. This intermediary structure minimizes interference between the two frequency bands, maintaining reliable antenna performance and beam characteristics while preserving multi-band capability.
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 scattered electromagnetic radiation by at least 10 dB, improves impedance matching, and enhances radiation pattern tuning, thereby improving the overall performance of the antenna.
Implementation Method 1
a parasitic radiator, configured such that a first induced current induced on the parasitic radiator within a second operating frequency band at least partially cancels a second induced current induced on the dipole arm within the second operating frequency band
Implementation Method 2
a dipole arm, configured to emit first electromagnetic radiation within a pre-determined first operating frequency band
Data Source
AI summary
The present disclosure relates to a radiating element, which includes: a dipole arm configured to emit first electromagnetic radiation within a pre-determined first operating frequency band; and a parasitic radiator, configured such that a first induced current induced on the parasitic radiator within a second operating frequency band at least partially cancels a second induced current induced on the dipole arm within the second operating frequency band. In addition, the present disclosure relates to a base station antenna, including: a first radiating element array, configured to emit first electromagnetic radiation within a pre-determined first operating frequency band, and at least a part of first radiating elements in the first radiating element array is constructed as radiating elements according to the present disclosure; a second radiating element array, configured to emit second electromagnetic radiation within a pre-determined second operating frequency band.