Dual-Polarized Magneto-Electric Dipole Antenna With Coupling Suppression
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Solution Overview
Problem
Traditional magneto-electric dipole antennas in multi-band base station arrays face performance deterioration due to strong mutual coupling between closely spaced radiation units, which affects their overall performance and miniaturization requirements.
Innovation Solution
A broadband dual-polarized filtering magneto-electric dipole antenna design featuring a radiation unit with orthogonal dipoles and a balun structure that includes balun assemblies, open-stubs, and feeder lines to introduce radiation suppression zero points, reducing coupling between units and enhancing passband edge frequency selectivity and out-of-band suppression.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If radiation units in different operating bands are closely spaced to meet miniaturization requirements, then base station size is reduced, but strong mutual coupling occurs which deteriorates antenna performance
Solution Approach 1:
The patent introduces a coupling isolation structure as an intermediary component between adjacent radiation units. This structure includes conductive plates and dielectric materials that act as a mediator to block electromagnetic coupling while maintaining compact spacing, thus resolving the contradiction between miniaturization and performance.
Solution Approach 2:
The patent extracts the coupling isolation function from the radiation unit design itself and implements it as a separate dedicated structure. By taking out the isolation requirement and addressing it independently through the coupling isolation structure, the radiation units can be closely spaced without compromising performance.
2Ease of manufacture
If traditional antenna designs are used in multi-band base station arrays, then implementation is straightforward, but mutual coupling between closely spaced units deteriorates overall performance
Solution Approach 1:
The patent merges the coupling isolation structure with the feed network and radiation unit components into an integrated assembly. The isolation structure is positioned and connected as part of the overall antenna module, maintaining ease of manufacture while improving performance through reduced mutual coupling.
3Area of stationary object
If radiation units are closely spaced for miniaturization, then base station footprint is reduced, but coupling to sideward radiation units working in different frequency bands increases
Solution Approach 1:
The patent converts the harmful mutual coupling effect into a beneficial frequency-selective filtering effect. The coupling isolation structure with its specific impedance design transforms the coupled energy into useful out-of-band suppression, improving passband edge frequency selectivity while maintaining compact footprint.
Solution Approach 2:
The patent changes the impedance parameters of the coupling isolation structure to achieve frequency-selective behavior. By carefully designing the impedance characteristics of the conductive plates and dielectric materials, the structure provides different effects at different frequencies, reducing coupling at operating frequencies while providing suppression in adjacent 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
The solution improves passband edge frequency selectivity, roll-off, and out-of-band suppression, reducing mutual coupling between radiation units, while maintaining a wide working frequency band and high gain with low cross-polarization and symmetrical polarization ports, achieving effective wireless communication.
Implementation Method 1
Two balun grounds of one of the balun assemblies, which are arranged opposite to each other at an interval form a first half-wave resonator for introducing a second radiation suppression zero point at a right side of a passband
Implementation Method 2
the radiators of the radiation structure form an electric dipole working mode when working
Implementation Method 3
The balun structure can form a magnetic dipole, and the two balun grounds of one of the balun assemblies in the balun structure, which are arranged opposite to each other at an interval, form a magnetic dipole working mode when working
Implementation Method 4
Under the action of radiation cancellation effect, a magneto-electric dipole working mode formed by combining the electrical dipole working mode with the magnetic dipole working mode introduces one first radiation suppression zero point on a left side of the passband
Implementation Method 5
the open-stub forms a second half-wave resonator for introducing a third radiation suppression zero point at the right side of the passband
Data Source
AI summary
Disclosed are a base station, and a broadband dual-polarized filtering magneto-electric dipole antenna and a radiation unit thereof. A radiation structure includes two dipoles with a polarization direction orthogonal to each other. Each dipole includes two radiators arranged opposite to each other. A balun structure includes four balun assemblies, each balun assembly includes two balun grounds arranged opposite to each other at an interval, and a feeder line and an open-stub arranged opposite to each other at an interval and electrically connected to each other. One balun ground is electrically connected to one radiator, the other balun ground is electrically connected to the other adjacent radiator. The feeder line and one balun ground are arranged opposite to each other at an interval. The open-stub and the other balun ground are arranged opposite to each other at an interval. The balun grounds are arranged between the feeder line and the open-stub.