Magnetically Coupled Patch Antenna for Ground-Free MIMO Placement
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
As multiple-input and multiple-output (MIMO) technology and 5G mobile communication systems advance, antenna devices face challenges in accommodating a larger number of line-shaped antennas without a ground electrode, leading to degraded antenna characteristics due to image current effects when line-shaped antennas are disposed above a ground electrode.
Innovation Solution
The use of a patch antenna with a patch structure, magnetically coupled to a second radiator via an antenna coupling element, which includes coils, allows for a wide range of usable frequencies without the need for a ground electrode, by optimizing the placement and polarity of electric fields and magnetic fields to reduce interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If line-shaped antennas are disposed above a ground electrode to accommodate more antennas, then the quantity of antennas increases, but image current flows in the ground electrode portion which degrades antenna characteristics
Solution Approach 1:
The patent introduces a patch antenna as an intermediary element that is magnetically coupled to the line-shaped antenna through a transformer structure. This patch antenna acts as a mediator that isolates the line-shaped antenna from the ground electrode, preventing image current interference while enabling the line-shaped antenna to be disposed above the ground electrode. The magnetic coupling through the transformer allows signal transmission without direct electrical connection, thus eliminating the harmful image current effect.
2Reliability
If line-shaped antennas are disposed in regions without ground electrodes to avoid image current, then antenna characteristics are maintained, but the area for antenna placement is limited
Solution Approach 1:
The patent utilizes magnetic coupling in the vertical dimension through the transformer structure to achieve isolation from the ground electrode. By transitioning from a planar placement constraint to a three-dimensional magnetic coupling approach, the system allows line-shaped antennas to be positioned above the ground electrode in the vertical dimension while maintaining electrical isolation through magnetic field coupling, thus expanding the usable placement area.
3Adaptability or versatility
If multiple line-shaped antennas are accommodated to support MIMO and 5G, then system capacity increases, but it becomes difficult to place them without ground electrodes
Solution Approach 1:
The patent creates a universal antenna structure where the patch antenna combined with the transformer serves as a multi-functional element. This universal structure can be replicated multiple times to support MIMO and 5G requirements, with each unit providing both radiation capability and ground electrode isolation. The standardized modular design reduces placement complexity while enabling high system capacity through multiple antenna elements.
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 antenna characteristics and expands the frequency range, achieving better radiation efficiency and impedance matching, thus overcoming the limitations of traditional antenna designs in regions without a ground electrode.
Implementation Method 1
a second coil connected to the second radiator and magnetically coupled to the first coil
Implementation Method 2
a first radiator with a patch structure capable of resonating in the first frequency range in a first direction and resonating in the second frequency range in a second direction
Implementation Method 3
If a line-shaped antenna is disposed above a ground electrode, image current flows in a ground electrode portion located close to the line-shaped antenna, and the image current affects the radiation from the line-shaped antenna
Data Source
AI summary
An antenna device includes a feeder circuit, a patch antenna, an antenna, a first coil connected between the feeder circuit and the patch antenna, and a second coil connected to the antenna and magnetically coupled to the first coil. The patch antenna resonates in a first frequency range in a first direction and in a second frequency range in a second direction. The antenna resonates in a third frequency range. A first center frequency refers to the center frequency of the first frequency range, a second center frequency refers to the center frequency of the second frequency range, a third center frequency refers to the center frequency of the third frequency range, and an absolute value of a difference between the first center frequency and the third center frequency is less than an absolute value of a difference between the second center frequency and the third center frequency.