Antenna Decoupling via Capacitive Neutralization Line
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Solution Overview
Problem
In wireless communication systems, multiple antennas experience increased coupling coefficients when closely spaced, leading to interference, especially in narrow spaces, which is a challenge for implementing Multiple Input Multiple Output (MIMO) technology in small terminals.
Innovation Solution
The solution involves designing antennas with a physically disconnected capacitive neutralization line and tapered feeding lines to reduce coupling coefficients, allowing for low interference without additional devices, and optimizing antenna placement and connection to achieve low reflection coefficients across a wide frequency band.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If multiple antennas are placed close together in narrow spaces, then the terminal size is reduced, but the coupling coefficient increases causing interference
Solution Approach 1:
A capacitive neutralization line is introduced as an intermediary element between the two antennas. This neutralization line acts as a mediator that cancels out the harmful coupling effects by providing an alternative current path, thereby reducing the coupling coefficient while allowing the antennas to remain in close proximity within the terminal housing.
Solution Approach 2:
The patent modifies the electrical parameters of the antenna system by introducing the capacitive neutralization line, which changes the current distribution and impedance characteristics. This parameter change allows the system to maintain low coupling coefficients even when antennas are placed close together, effectively decoupling the antennas without increasing physical separation distance.
2Object-generated harmful factors
If antenna separation distance is increased, then coupling coefficient is reduced, but the available space for terminal components is reduced
Solution Approach 1:
The capacitive neutralization line serves as an intermediary that enables antenna decoupling without requiring increased physical separation. By providing an alternative current path between the antennas, the neutralization line reduces coupling effects while maintaining compact antenna spacing, thereby preserving available space for other terminal components.
3Object-generated harmful factors
If additional devices are added to reduce coupling, then coupling coefficient is minimized, but device complexity increases
Solution Approach 1:
The capacitive neutralization line performs multiple functions simultaneously: it reduces coupling between antennas, maintains impedance matching, and can be integrated into the existing antenna feed structure. This multi-functionality allows the system to minimize coupling without adding separate dedicated devices, thereby avoiding increased device complexity.
Solution Approach 2:
The neutralization line is merged with the existing antenna feeding structure, combining the coupling reduction function with the signal transmission path. This integration approach eliminates the need for separate additional devices, maintaining simplicity in the overall device architecture while achieving the desired coupling reduction.
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 design effectively minimizes coupling coefficients between antennas, reducing interference and extending the bandwidth with low reflection coefficients, enabling efficient MIMO systems in compact spaces without the need for separate devices or large separation distances.
Implementation Method 1
a line for decreasing a coupling coefficient by indirectly connecting the first antenna and the second antenna using a physically disconnected line
Data Source
AI summary
An apparatus for multiple antennas having a low coupling coefficient in a wide frequency bandwidth in a wireless communication system is provided. To obtain the low coupling coefficient in the wide frequency bandwidth by minimizing interference between antennas which are close to each other, without an additional device, in the wireless communication system, the apparatus includes a transceiver and a line for decreasing a coupling coefficient. The transmitter includes a first antenna and a second antenna for transmitting and receiving signals over a radio channel and the line is indirectly connected the first antenna and the second antenna using a physically disconnected line.